DATA SHEET AAT3607: PMU with OVP Dynamic Li-ion Charger Applications Description Cellular phones Digital cameras Handheld instruments MP3 and MP4 PDAs and handheld computers Portable GPS devices The AAT3607 is a member of the Skyworks Total Power Management IC (TPMICTM) product family that functions as a highly integrated power management unit (PMU) for MP3/MP4 players and other handheld applications. It integrates a single-cell Lithium Ion/Polymer battery dynamic charger module powered from an AC/DC adapter or USB port, three 120° phase shifted synchronous 1.6 MHz DC-DC step-down converters and two LDOs for the system. Features The typical input power source for the AAT3607 is a single-cell Li-ion battery. The charger can be powered from either a currentlimited USB port or an AC/DC adapter, with charge current programmed by two separate external resistors and selected by a logic input pin. With the device’s dynamic charging feature, a system connected to the AAT3607 can draw power from the power supply without a battery, or charge the battery with the power left over from the system. If the power supply has limited current capability, the system draws power from both the limited power supply source and the battery. VIN operating range: 4.1 V to 5.5 V Over-voltage input protection Functional without battery connected Dynamic Li-ion charger: Charge enable control Two programmable/selectable charging currents up to 1 A Programmable end of charge current Charge current reduction Thermal loop charge reduction Reverse blocking Three 1.6 MHz synchronous programmable step-down converters: 120 switching phase shift Three independent enable controls Buck 1: 400 mA Buck 2: 300 mA Buck 3: 300 mA Two programmable and separate enable LDOs: LDO1: 150 mA LDO2: 150 mA Fault protection scheme: Under-voltage lockout (UVLO) Over-temperature protection (OTP) Fast turn-on time Built-in soft-start and power on reset Low standby current Thermally enhanced TQFN (28-pin, 4 mm 4 mm) package (MSL1, 260 ºC per JEDEC J-STD-020) The battery charger is a complete constant current/constant voltage linear charger. It offers an integrated pass device, reverse blocking protection, high accuracy current and voltage regulation, charge status, and charge termination. The charging current is programmable by means of an external resistor up to 1 A. The AAT3607 also includes over-voltage input protection (OVP), under-voltage lockout (UVLO), and over-temperature protection (OTP) to protect the PMU under fault conditions. The three integrated step-down converters operate under synchronous PWM control with a 1.6 MHz switching frequency and internal compensation, decreasing both size and quantity of external components. The phase shift feature allows ripple cancellation between the three converters when all are running with nominal load. The AAT3607 is available in a thermally enhanced 28-pin 4 mm 4 mm TQFN package with exposed pad. A typical application circuit is shown in Figure 1. The pin configurations are shown in Figure 2. Signal pin assignments descriptions are provided in Table 1. Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30 2014 1 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER 1 kΩ ADP/USB 10 μF RSET1 BAT CHG SYS Current Select ISEL Charger Enable CEN AAT3607 LX2 LO2 LX3 ENL2 LDO2 EN RESET 300 mA BO2 300 mA BO3 4.7 μF BFB3 AGND RST BO1 En Buck 3 2.2 μH LFB2 400 mA 4.7 μF BFB2 ENB3 ENL1 2.2 μF En Buck 2 2.2 μH ENB2 LFB1 BAT 4.7 μF BFB1 LO1 LDO1 EN En Buck 1 2.2 μH LX1 ITERM 2.2 μF SYS 10 μF PB PGND ENB1 IR0 RTERM LO2 150 mA VIN IR1 RSET0 LO1 150 mA 1 μF tc339 Figure 1. AAT3607 Typical Application Circuit AGND VIN ISEL IR1 IR0 ITERM CEN 28 ENB1 ENB2 ENB3 CHG LX1 PGND LX2 27 26 25 24 23 22 1 21 2 20 3 19 4 18 5 17 6 16 7 15 8 9 10 11 12 13 LFB1 LFB2 LO1 LO2 SYS BAT RST 14 ENL1 ENL2 BFB1 BFB2 BFB3 PB LX3 tc340 Figure 2. AAT3607 Pinout – 28-Pin, 4 mm 4 mm TQFN (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Table 1. AAT3607 Signal Descriptions Pin Number Name Description 1 ENB1 Enable input for Buck 1 with 1 M internal pull down resistor. 2 ENB2 Enable input for Buck 2 with 1 M internal pull down resistor. 3 ENB3 Enable input for Buck 3 with 1 M internal pull down resistor. 4 CHG Open drain charge status output. Active low to indicate the battery is charging. 5 LX1 6 PGND 7 LX2 Inductor switching node of Buck 2. 8 LX3 Inductor switching node of Buck 3. 9 PB Input power for Buck 1, 2, and 3. Connect to SYS with a bypass capacitor to ground. 10 BFB3 Feedback pin for Buck 3; connect to a resistor divider for an adjustable output voltage. 11 BFB2 Feedback pin for Buck 2; connect to a resistor divider for an adjustable output voltage. 12 BFB1 Feedback pin for Buck 1; connect to a resistor divider for an adjustable output voltage. 13 ENL2 Enable input for LDO 2 with 1 M internal pull-down resistor. 14 ENL1 Enable input for LDO 1 with 1 M internal pull-down resistor. RST Open drain reset output. Active low to indicate that BFB1, or BFB2, or BFB3 is below its regulation threshold after enable. RST goes high 200 ms after the last enabled Buck reaches 80% of the regulation threshold. RST is high-impedance when ENB1, 2 and 3 are low, and VIN is unconnected. 15 Inductor switching node of Buck 1. Power ground. 16 BAT Positive battery terminal connection. Connect BAT to the positive terminal of a single-cell Li+/Li-Poly battery. Bypass BAT to GND with a 1 F to 10 F ceramic capacitor. 17 SYS System supply output. Bypass SYS to GND with a 10 F ceramic capacitor. If a valid voltage is present at VIN, and the system load exceeds the input supply current limit to cause VIN drops below BAT, then both the external power source and the battery supplies current to SYS. SYS is connected to BAT through an internal system load switch when a valid source is not present at VIN. 18 LO2 LDO 2 output with 5 k internal pull down resistor for fast turn off. 19 LO1 LDO 1 output with 5 k internal pull down resistor for fast turn off. 20 LFB2 Feedback pin for LDO 2; connect to a resistor divider for an adjustable output voltage. 21 LFB1 Feedback pin for LDO 1; connect to a resistor divider for an adjustable output voltage. 22 AGND Analog ground. 23 VIN DC power input from AC/DC adapters or USB input. 24 ISEL Charge current setting selection input to select IR0 or IR1. 25 IR1 Charge current 1 programming resistor, selected by ISEL = 1. 26 IR0 Charge current 2 programming resistor, selected by ISEL = 0. 27 ITERM 28 CEN EP Connect a resistor between this pin and ground to set the end of charge termination current. Battery charger enable pin, active high with 200 k internal pull down resistor. Exposed pad. Connect to ground directly beneath the package. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30, 2014 3 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Electrical and Mechanical Specifications The absolute maximum ratings of the AAT3607 are provided in Table 2, the recommended operating conditions are listed in Table 3, and electrical specifications are provided in Table 4. Table 2. AAT3607 Absolute Maximum Ratings (Note 1) Parameter Symbol Minimum Maximum Units 7.5 V Maximum DC input voltage for VIN VIN_MAX Maximum rating Power and logic pins VIN + 0.3 V Operating temperature range TJ 40 85 ºC Soldering temperature range TS 65 150 ºC Maximum soldering temperature (at leads, 10 sec.) TLEAD 300 ºC Note 1: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. Exceeding any of the limits listed may result in permanent damage to the device. Table 3. AAT3607 Recommended Operating Conditions Parameter Symbol Value Units Thermal resistance JA 49 ºC/W Thermal resistance from junction to case JC 29 ºC/W Maximum power dissipation PD 2.0 W CAUTION: Although this device is designed to be as robust as possible, electrostatic discharge (ESD) can damage this device. This device must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Table 4. AAT3607 Electrical Specifications (1 of 2) (Note 1) (VIN = 5 V, VBAT = 3.6 V, VSYS = VIN or VBAT, TA = –40 C to +85 C, Typical Values are TA = 25 C, Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units 7.5 V Power Supply Input over-voltage protection range VIN_OVPMAX AC/DC adaptor connected DC input operating voltage VIN 4.1 5.5 V Battery input operating voltage VBAT 2.7 4.2 V Quiescent current IQ Buck 1-3 and LDO 1/2 enable, battery charger enabled, no load 1000 A Shutdown current ISHDN CEN; ENL1; ENL2; ENB1; ENB2; ENB3 = 0 1 A Under-voltage lockout voltage VUVLO VIN rising UVLO hysteresis VUVLOHYS Over-voltage protection voltage VOVP OVP hysteresis OVPHYS 200 mV OVP switch on-resistance OVPRDSON 0.18 Load switch current limit ILIM 700 3.85 4 4.1 500 VIN rising 6.05 900 6.25 1000 V mV 6.45 1100 V mA Buck 1 Input voltage VPB Output voltage accuracy VACC_BO1 Output voltage range VRG_BO1 Feedback voltage VBFB1 Maximum load current IBO1_MAX Feedback leakage IBO1FBL P-channel current limit IBO1LIMP VSYS IBO1 = 10 mA to 400 mA, VIN = 4.1 V to 5.5 V 3 3 0.6 0.591 V 0.6 % VSYS 0.6 V 0.609 V 400 mA IBO1FB = 0.6 V 0.2 800 A mA High side switch on-resistance RBO1(DSON)_P 300 m Low side switch on-resistance RBO1(DSON)_N 200 m Load regulation ΔVBO1/VBO1 ILOADB1 = 10 mA to 400 mA 1 % Line regulation ΔVLBO1/ΔVBO1 VIN = 4.1 V to 5.5 V, ILOADB1 = 400 mA Oscillator frequency fOSCB1 Start-up time tSB1 From enable to output regulation Input low current IENB1 VSYS = VFBB1 = 5.0 V RST pin sink current IRST RST pin low voltage VRST_LOW 0.3 %/V 1.6 MHz 120 s 10 10 8 IRST = 4 mA A mA 0.4 V 3 % Buck 2 and Buck 3 Input voltage VPB Output voltage accuracy VACC_BO2,3 VSYS Output voltage range VRG_BO2,3 Feedback voltage VBFB2,3 Maximum load current IBO2,3_MAX Feedback leakage IBO2,3FBL P-channel current limit IBO2,3LIM_P 600 mA High-side switch on-resistance RBO2,3DSON_P 300 m Low-side switch on-resistance RBO2,3DSON_N 200 m IBO2,3 = 10 mA to 300 mA 3 0.6 0.591 0.6 VSYS 0.6 V 0.609 V 300 mA VBO2,3FB = 0.6 V 0.2 A Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30, 2014 5 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Table 4. AAT3607 Electrical Specifications (2 of 2) (Note 1) (VIN = 5 V, VBAT = 3.6 V, VSYS = VIN or VBAT, TA = –40 C to +85 C, Typical Values are TA = 25 C, Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units Buck 2 and Buck 3 Load regulation ΔVBO2,3/VBO2,3 ILOADB2,3 = 10 mA to 300 mA Line regulation ΔVLBO2,3/ΔVBO2,3 VIN = 4.1 V to 5.5 V, ILOADB2,3 = 300 mA, TA = 25 °C Oscillator frequency fOSCB2,3 Start-up time tSB2,3 From enable to output regulation Input low current IENB2,3 VSYS = VFBB2,3 = 5.0 V VBAT_REG 0 °C TA +70 °C 1 % 0.3 %/V 1.6 MHz s 120 10 10 A V Battery Charger Output charger voltage regulation 4.158 4.2 4.242 2.4 2.6 2.8 Preconditioning voltage threshold VMIN Preconditioning charge current ICH_PRE Constant-current mode charge current ICH_CC Thermal loop regulation TREG 90 °C Thermal loop entering threshold TLOOP_IN 110 °C Thermal loop exiting threshold TLOOP_OUT 85 °C CHG pin sink current ICHG 8 mA 10 ISEL = 1, RSET1 =1.6 k, VBAT = 3.6 V 900 1000 V %ICH_CC 1100 mA CHG pin low voltage VCHGL 0.4 V Enable threshold low VCENL 0.6 V Enable threshold high VCENH 1.4 V LDO 1, 2 Output voltage accuracy Output voltage range VACC_LO1,2 IOUT = 1 mA to 150 mA, TA = 25 °C 1.5 1.5 IOUT = 1 mA to 150 mA, TA = 40 °C to 85 °C 2.5 2.5 0.6 VSYS VDO2 V 400 mV VRG_LO1,2 Input voltage VLDO1,2_IN Dropout voltage (Note 2) VDO ILO1,2 = 150 mA VSYS 200 Line regulation ΔVLO1,2/VLO1,2 ΔVLDO1,2_IN VSYS = VLO1,2 + 1 to 5.0 V 0.09 Output current ILO1,2 VLO1,2 > 0.6 V Short circuit current ISC VLO1,2 < 0.4 V Output voltage temperature coefficient % V %/V 150 mA 250 mA TLO1,2C 22 ppm/°C Enable time delay TENL1,2_DLY 15 μs Enable threshold low VENL1,2_L Enable threshold high VENL1,2_H 0.6 1.4 V V Thermal Over-temperature shutdown threshold TSD Over-temperature shutdown hysteresis THYS Warning thermal threshold 140 °C 15 °C Note 1: Performance is guaranteed only under the conditions listed in this table. Note 2: VDO is defined as VIN – VOUT when VOUT is 98% of nominal. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Typical Performance Characteristics 1200 600 1000 500 800 400 600 ICH (mA) RSET = 3.24 kΩ RSET = 3.56 kΩ RSET = 16 kΩ RSET = 1.6 kΩ RSET = 1.78 kΩ RSET = 2 kΩ 300 200 200 0 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 VIN = 4.5 V VIN = 5.0 V VIN = 5.5 V 100 RSET = 32.4 kΩ 0 2.4 5.5 2.8 3.2 tc342 400 tc341 Constant Current (mA) (VIN = 5 V, VBAT = 3.6 V, VSYS = VIN or VBAT, TA = –40 C to +85 C, Typical Values are TA = 25 C, Unless Otherwise Noted) 3.6 4.0 4.4 VBAT (V) Input Voltage VIN (V) Figure 4. Charge Current vs Battery Voltage (RSET = 3.24 k) Figure 3. Constant Current vs Input Voltage 4.3 3 2.9 2.6 2.5 2.4 2.3 TA = 0 °C TA = 25 °C TA = 70 °C 2.2 2.1 2 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 Input Voltage VIN (V) Figure 5. Pre-Conditioning Threshold Voltage vs Input Voltage 4.25 4.2 4.15 4.1 4.5 tc344 Battery Voltage (V) 2.7 tc343 Battery Voltage (V) 2.8 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 Input Voltage VIN (V) Figure 6. Battery Voltage vs Input Voltage Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30, 2014 7 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER 3 100 VSYS = 4.2 V VSYS = 4.5 V VSYS = 5.0 V VSYS = 5.5 V VBAT = 3.7 V VBAT = 4.2 V 90 2 Output Error (%) 80 60 VSYS = 4.2 V VSYS = 4.5 V VSYS = 5.0 V VSYS = 5.5 V VBAT = 3.6 V VBAT = 4.2 V 40 30 20 10 0 0.1 1 10 100 1 0 -1 -2 -3 0 1000 tc346 50 tc345 Efficiency (%) 70 50 100 150 200 350 400 Figure 8. Buck 1 DC Regulation (VOUT = 3.0 V, L = 2.2 H) Figure 7. Step-Down Buck Efficiency vs Output Current (VOUT = 3.0 V, L = 2.2 H) 1 100 80 Output Error (%) 0.5 70 60 VSYS = 4.2 V VSYS = 4.5 V VSYS = 5.0 V VSYS = 5.5 V VBAT = 3.0 V VBAT = 3.6 V VBAT = 4.2 V 30 20 10 1 10 100 0 -0.5 tc347 40 -1 0 1000 tc348 50 VBAT = 3.0 V VBAT = 3.6 V VBAT = 4.2 V VSYS = 4.2 V VSYS = 4.5 V VSYS = 5.0 V VSYS = 5.5 V 90 Efficiency (%) 300 Output Current (mA) Output Current (mA) 0 0.1 250 50 100 150 200 250 300 Output Current (mA) Output Current (mA) Figure 10. Buck 2 DC Regulation (VOUT = 1.8 V, L = 2.2 H) Figure 9. Step-Down Buck Efficiency vs Output Current (VOUT = 1.8 V, L = 2.2 H) 1 100 90 0.5 60 VSYS = 4.2 V VSYS = 4.5 V VSYS = 5.0 V VSYS = 5.5 V VBAT = 3.0 V VBAT = 3.6 V VBAT = 4.2 V 50 40 30 20 10 0 0.1 1 10 100 0 -0.5 -1 1000 Output Current (mA) Figure 11. Step-Down Buck Efficiency vs Output Current (VOUT = 1.2 V, L = 2.2 H) VBAT = 3.0 V VBAT = 3.6 V VBAT = 4.2 V VSYS = 4.2 V VSYS = 4.5 V VSYS = 5.0 V VSYS = 5.5 V -1.5 tc350 Output Error (%) 70 tc349 Efficiency (%) 80 -2 0 50 100 150 200 250 Output Current (mA) Figure 12. Buck 3 DC Regulation (VOUT = 1.2 V, L = 2.2 H) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A 300 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER 1.0 1.80 0.7 0.6 0.5 0.4 TA = –40 °C TA = 25 °C TA = 85 °C 0.3 0.2 4.1 4.3 4.5 4.7 4.9 5.1 5.3 1.75 1.70 1.65 1.60 1.55 tc352 Switching Frequency (MHz) 0.8 tc351 Quiescent Current (mA) 0.9 1.50 4.1 5.5 4.3 4.5 4.7 4.9 5.1 5.3 5.5 Input Voltage VIN (V) Input Voltage VIN (V) Figure 14 Frequency vs Input Voltage Figure 13. Quiescent Current vs Input Voltage (Buck 1-3 and LDO 1/2 Enabled, No Load) 1.75 VEN (2 V/div) 0 1.70 1.65 VOUT (2 V/div) 1.60 IIN (200 mA/div) 1.55 1.50 -40 0 tc353 Switching Frequency (MHz) 1.80 -15 10 35 60 tc354 85 Time (40 μs/div) Temperature (°C) Figure 16. Buck 1 Soft Start (VIN = 5.0 V, VOUT = 3.0 V, IOUT = 400 mA) 2.0 2.0 1.5 1.5 Output Accuracy (%) 1.0 0.5 0.0 -0.5 -1.0 0.5 0.0 -0.5 -1.0 -1.5 tc355 -1.5 -2.0 -40 1.0 -15 10 35 60 85 Temperature (°C) Figure 17. Buck 1 Output Voltage Accuracy vs Temperature (VIN = 5.0 V, VOUT = 3.0 V, IOUT = 400 mA) -2.0 -40 tc356 Output Accuracy (%) Figure 15. Switching Frequency vs Temperature (VIN = 5.0 V) -15 10 35 60 85 Temperature (°C) Figure 18. Buck 2 Output Voltage Accuracy vs Temperature (VIN = 5.0 V, VOUT = 1.8 V, IOUT = 300 mA) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30, 2014 9 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER 2.0 0.5 IOUT = 10 mA IOUT = 100 mA IOUT = 200 mA IOUT = 300 mA IOUT = 400 mA 1.0 0.25 Accuracy (%) 0.5 0.0 -0.5 0 -0.25 -1.0 tc357 -1.5 -2.0 -40 -15 10 35 60 tc358 Output Accuracy (%) 1.5 -0.5 4.1 85 4.3 4.5 4.9 5.1 5.3 5.5 Input Voltage VIN V) Temperature (°C) Figure 20. Buck 1 Line Regulation (VOUT = 3.0 V) Figure 19. Buck 3 Output Voltage Accuracy vs Temperature (VIN = 5.0 V, VOUT = 1.2 V, IOUT = 300 mA) 0.5 0.5 IOUT = 10 mA IOUT = 100 mA IOUT = 200 mA IOUT = 300 mA IOUT = 10 mA IOUT = 100 mA IOUT = 200 mA IOUT = 300 mA 0.25 Accuracy (%) 0.25 0 0 -0.25 tc359 -0.25 -0.5 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 tc360 Accuracy (%) 4.7 -0.5 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 Input Voltage VIN V) Input Voltage VIN V) Figure 22. Buck 1 Line Regulation (VOUT = 1.2 V) Figure 21. Buck 2 Line Regulation (VOUT = 1.8 V) IINDUCTOR (200 mA/div) IINDUCTOR (200 mA/div) 0 0 VLX (2 V/div) VLX (2 V/div) 0 VOUT 0 (20 mV/div) (AC Coupled) 0 VOUT (20 mV/div) (AC Coupled) 0 tc361 Time (400 ns/div) Figure 23. Buck 1 Output Ripple (VIN = 5.0 V, VOUT = 3.0 V, COUT = 4.7 F, 400 mA Load) tc362 Time (400 ns/div) Figure 24. Buck 2 Output Ripple (VIN = 5.0 V, VOUT = 1.8 V, COUT = 4.7 F, 300 mA Load) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER IINDUCTOR (200 mA/div) VOUT 0 (100 mV/div) 0 VLX (2 V/div) IOUT (100 mA/div) VOUT 0 (20 mV/div) (AC Coupled) 0 0 tc364 tc363 Time (20 μs/div) Time (400 ns/div) Figure 25. Buck 3 Output Ripple (VIN = 5.0 V, VOUT = 1.2 V, COUT = 4.7 F, 300 mA Load) Figure 26. Buck 1 Load Transient Response (VIN = 5.0 V, VOUT = 3.0 V, 75 mA to 150 mA Load) VOUT 0 (50 mV/div) VOUT 0 (100 mV/div) IOUT (100 mA/div) IOUT (100 mA/div) 0 0 tc366 tc365 Time (20 μs/div) Time (20 μs/div) Figure 28. Buck 3 Load Transient Response (VIN = 5.0 V, VOUT = 1.2 V, 75 mA to 200 mA Load) Figure 27. Buck 2 Load Transient Response (VIN = 5.0 V, VOUT = 1.8 V, 75 mA to 125 mA Load) VIN (2 V/div) VIN (2 V/div) 0 0 VOUT (100 mV/div) 0 VOUT (100 mV/div) 0 tc368 tc367 Time (40 μs/div) Figure 29. Buck 1 Line Transient Response (VIN = 4.1 V to 5.0 V, VOUT = 3.0 V, 400 mA Load) Time (40 μs/div) Figure 30. Buck 2 Line Transient Response (VIN = 4.1 V to 5.0 V, VOUT = 1.8 V, 300 mA Load) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30, 2014 11 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER 0.3 Load Regulation (%) 0 VOUT (100 mV/div) 0 VBAT = 3.0 V VBAT = 3.6 V VBAT = 4.2 V VSYS = 4.2 V VSYS = 4.5 V VSYS = 5.0 V VSYS = 5.5 V 0.2 VIN (2 V/div) 0.1 0.0 -0.1 tc370 -0.2 -0.3 tc369 0 30 60 Time (40 μs/div) 2.85 1.0 2.80 0.5 0.0 -0.5 -1.0 2.75 2.70 IOUT = 0 mA IOUT = 10 mA 2.65 IOUT = 50 mA IOUT = 100 mA 2.60 IOUT = 150 mA tc371 -1.5 10 35 60 2.55 2.8 85 2.85 2.9 3.0 3.05 3.1 3.2 Figure 34. Dropout Characteristics vs Input Voltage (VOUT = 2.8 V) Figure 33. Output Voltage Accuracy vs. Temperature (VIN = 5.0 V, VOUT = 2.8 V, IOUT = 150 mA) 1.2 60 50 40 30 20 tc373 10 1 10 Frequency (kHz) Figure 35. PSRR vs Frequency (VIN = 5.0 V, VRIPPLE = 500 mV, 10 mA Load) 100 1.1 1.0 0.9 0.8 0.7 0.6 4.1 ENH ENL 4.3 4.5 4.7 4.9 5.1 5.3 tc374 Enable Threshold Voltage (V) 70 5.5 Input Voltage VIN V) Figure 36. Enable Threshold Voltage vs Input Voltage (LDO2) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 12 3.15 Input Voltage VIN V) Temperature (°C) PSRR (dB) 2.95 tc372 Output Voltage (V) Output Accuracy (%) 2.90 1.5 -15 150 Figure 32. Load Regulation vs Output Current 2.0 0 0.1 120 Output Current (mA) Figure 31. Buck 3 Line Transient Response (VIN = 4.1 V to 5.0 V, VOUT = 1.2 V, 300 mA Load) -2.0 -40 90 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A 0.5 0.25 0.4 0.20 0.15 0.10 TA = –40 °C TA = 25 °C TA = 85 °C 0.05 0 0 30 60 90 120 150 IOUT = 10 mA IOUT = 50 mA IOUT = 100 mA IOUT = 150 mA 0.3 0.2 0.1 tc376 Dropout Voltage (V) 0.30 tc375 Dropout Voltage (V) DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER 0 -40 -15 10 35 60 85 Temperature (°C) Output Current (mA) Figure 38. Dropout Voltage vs Temperature Figure 37. Dropout Voltage vs Output Current 0.5 Accuracy (%) 0.25 0 IOUT = 50 mA IOUT = 100 mA IOUT = 150 mA -0.5 4.1 4.3 4.5 4.7 4.9 5.1 5.3 tc377 -0.25 5.5 Input Voltage VIN V) Figure 39. Line Regulation (VOUT = 2.8 V) VIN (2 V/div) VOUT (50 mV/div) 0 0 IOUT (50 mA/div) VOUT (100 mA/div) 0 0 tc379 tc378 Time (40 μs/div) Figure 40. Line Transient Response (VIN = 4.1 V to 5.0 V, VOUT = 1.8 V, 150 mA Load) Time (20 μs/div) Figure 41. Load Transient Response (VIN = 5.0 V, VOUT = 2.8 V, 50 mA to 150 mA Load) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30, 2014 13 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER BAT VIN CHG OVP Circuit OVP Switch SYS ISEL IR1 Charger Control Logic IR0 CEN VB ITERM LX1 ENL1 BFB1 BUCK1 LO1 ENB1 LDO1 PGND LFB1 AGND LX2 LO2 BFB2 BUCK2 ENL2 ENB2 LDO2 LFB2 LX3 RST Reset Function BFB3 BUCK3 ENB3 tc380 Figure 42. AAT3607 Functional Block Diagram Functional Description The AAT3607 is a complete power management solution. It seamlessly integrates a battery charger with three step-down converters and two low-dropout regulators to provide power from a wall adapter, a USB port, or a single-cell Lithium Ion/Polymer battery. Internal load switches allow the converters to operate from the best available power source. If only the battery is available, the voltage converters are powered directly from the battery through a 100 m load switch. The charger goes into sleep mode and draws less than 1 A quiescent current. If the system is connected to a wall adapter, the voltage converters are powered directly from the adapter through the Over-Voltage Protection (OVP) switch with on-resistance of 180 m and the battery is disconnected from the voltage converters’ inputs. This allows the system to operate regardless of the charging state of the battery, or to operate with no battery. The charger circuitry offers flexible power distribution from an AC/DC adapter or a current-limited USB source to the battery and system load. The battery is charged with any available power not used by the system load. If a system load peak exceeds the input current limit, supplemental current is taken from the battery. Figure 42 shows the functional block diagram for the AAT3607. Battery Charger and SYS The charger seamlessly distributes power between the currentlimited external input, the battery, and the system load. The basic functions performed with the battery and external power source are: If the system load requirements are less than the input current limit, the battery is charged with residual power from the input source. If the system load requirements exceed the input current limit, the battery supplies supplemental current to the load through the internal system load switch. If the battery is connected and there is no external power input, SYS is powered only from the battery. If an external power input is connected and there is no battery, the SYS is powered from the external power input. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 14 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER A thermal-limiting circuit reduces the battery charge rate from the external power source current to prevent the IC from overheating. VIN is the power input pin that supplies the system (SYS) up to 1 A through an over-voltage protection switch. The battery charge current level is selected with the ISEL input pin. The two current levels are designed for use with AC/DC wall adapters and current-limited USB power sources. The operating voltage range for VIN is 4.1 V to 5.5 V. When the input voltage is below the under-voltage threshold or below the battery voltage, it is considered to be invalid. The power input is disconnected when the input voltage is invalid. Battery Charger Battery charging commences only after the AAT3607 battery charger enable pin (CEN) is turned on and the charger circuits check for several conditions in order to maintain a safe charging environment. The input supply must be above the minimum operating voltage (UVLO) and must be within specifications. The OVP function ensures that only safe input voltages within specifications are connected to the battery charger. Otherwise, the unsafe input voltage is completely disconnected from the battery charger terminals. When the battery is connected to the BAT pin, the battery charger checks the condition of the battery and determines which charging mode to apply. If the battery voltage is below VMIN, the battery charger initiates trickle charge mode and charges the battery at 10% of the programmed constantcurrent magnitude. For example, if the programmed current is 500 mA, the trickle charge current will be 50mA. Trickle charge is a safety precaution for a deeply discharged cell and also reduces the power dissipation in the internal series pass MOSFET when the input-output voltage differential is at its highest. Trickle charge mode continues until the battery voltage reaches 2.6 V. At this point the battery charger switches to constant current charge mode. The current level for this mode is programmed by the IR1 and IR0 pins using a resistor connected from the pin to ground and selected by the ISET pin. Programmed current can be set from a minimum of 100 mA up to a maximum of 1 A. Constant current charge mode continues until the battery voltage reaches the voltage regulation point VBAT_REG. When the battery voltage reaches the regulation voltage (VBAT_REG), the battery charger transitions to constant voltage mode. VBAT_REG is factory programmed to 4.2 V (nominal). Charging in constant voltage mode continues until the charge current has fallen to the end of charge termination current. The charge termination current level is programmed by the ITERM pin with a resistor connected to this pin to ground. Floating this pin will result in the termination current set to 10% of IR0 or IR1. Connecting this pin to ground will result in the lowest termination current. After the charge cycle is complete, the battery charger turns off the series pass device and automatically goes into a power saving sleep mode. During this time, the series pass device blocks current in both directions to prevent the battery from discharging through the battery charger. The battery charger remains in sleep mode even if the charger source is disconnected. It comes out of sleep mode when either the battery terminal voltage drops below the (VBAT_REG 0.1 V) threshold or the charger CEN pin is recycled, or the charging source is reconnected. In all cases, the battery charger monitors all parameters and resumes charging in the most appropriate mode. When no automatic charge reduction mode or digital thermal loop is triggered, the charge profile is controlled as shown in Figure 43. The AAT3607 also includes an integrated reverse blocking function. Battery Charge Current Battery Voltage Preconditioning Trickle Charge Phase Constant Current (CC) Charge Phase Constant Voltage (CV) Charge Phase Charge Complete Voltage I = Max CC Regulated Current Charge Current Battery Voltage Constant Current Mode Voltage Threshold Termination Current Set by RTERM Trickle Charge Current I = CC/10 Time tc381 Figure 43. Charge Current vs. Battery Voltage Profile During Charging Phases Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30, 2014 15 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Thermal Loop Control OVP Switch The actual maximum charging current is a function of charge adapter input voltage, the state of charge of the battery at the moment of charge, the ambient temperature, and the thermal impedance of the package. The maximum programmable current may not be achievable under all operating parameters. One issue to consider is the amount of current being provided to the SYS from VIN and at the same time being provided as charge current to the battery from VIN. A reduction in the charge current is designed when the device temperature is too high through the digital thermal loop of the charger. In normal operation the OVP switch acts as a load switch, connecting and disconnecting the power supply from VIN. A low resistance MOSFET is used to minimize the voltage drop between the voltage source and the charger and to reduce power dissipation. When the voltage on the input exceeds the 6.25 V voltage limit, the device immediately turns off the internal OVP switch, disconnecting the load from the abnormal voltage and preventing damage to any downstream components. If an over-voltage condition is applied when the device is enabled, then the switch remains OFF. To protect the linear charging IC from thermal problems, a special thermal loop control system is used to maximize charging current. The thermal management system measures the internal circuit die temperature and reduces the fast charge current when the die exceeds the preset internal temperature control threshold. Once the thermal loop control becomes active, the fast charge current is initially reduced by a factor of 0.44. On initial power-up, if UVLO < VIN < 6.25 V, the OVP switch turns on after an 180 s typical internal delay, if VIN < UVLO or if VOVP > 6.25 V, the OVP switch is held off. The initial thermal loop current can be estimated by the following equation: The AAT3607 contains two high-performance 300 mA and one high-performance 400 mA, 1.6 MHz synchronous step-down converters. The step-down converters operate to ensure high efficiency performance over all load conditions. All three output voltages are programmable by external resistor dividers to feedback the output voltage and compare it to the internal 0.6 V reference voltage. I TLOOP I CC 0.44 The thermal loop control re-evaluates the circuit die temperature every three seconds and raises the fast charge current in small steps to the full fast charge current level. Figure 44 illustrates the thermal loop function at 1 A fast charge current as the ambient temperature increases and recovers. In this manner the thermal loop controls the system charge level, and the AAT3607 provides the highest level of constant current in the fast charge mode for any possible valid ambient temperature condition. Synchronous Step-Down Converter The input voltage range is from 4.1 V to 5.5 V, and the output voltage is programmable. Power devices are sized for 300 mA and 400 mA current capability while maintaining over 90% efficiency at full load. High efficiency is maintained at lower currents. A high DC gain error amplifier with internal compensation controls the output. It provides excellent transient response and load/line regulation. Transient response time is typically less than 20 s. The converter has soft start control to limit inrush current. 1.2 1.0 IIN (200 mA/div) If VIN > 6.25 V, the OVP switch is held off. After VIN < (6.25 V hysteresis), the OVP switch turns on after an 180 s typical internal delay. 0.8 Apart from the input capacitor, only a small L-C filter is required at the output side for the step-down converters to operate properly. Typically, a 2.2 H inductor or a 4.7 F ceramic capacitor is recommended for low output voltage ripple and small component size. 0.6 0.4 0.2 0 tc382 Time (10 s/div) Figure 44. Digital Thermal Loop Function at 1 A Fast Charge Current with Ambient Temperature Increasing and Recovering Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 16 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Control Loop The converter is a peak current mode step-down converter. The inner, wide bandwidth loop controls the inductor peak current. The inductor current is sensed through the P-channel MOSFET (high side) and is also used for short-circuit and overload protection. A fixed slope compensation signal is added to the sensed current to maintain stability for duty cycles greater than 50%. The peak current mode loop appears as a voltage programmed current source in parallel with the output capacitor. The output of the voltage error amplifier programs the current mode loop for the necessary peak inductor current to force a constant output voltage for all load and line conditions. The voltage feedback resistive divider is external and the error amplifier reference voltage is 0.6 V. The voltage loop has a high DC gain making for excellent DC load and line regulation. The internal voltage loop compensation is located at the output of the transconductance voltage error amplifier. Soft Start of the chip rises above the temperature shutdown threshold, the AAT3607 is forced to turn off and restarts when the overtemperature condition is removed. Worst case clock Buck1 Buck2 Buck3 with built-in 120º phase shift Soft start increases the inductor current limit point linearly when the input voltage or enable input is applied. It limits the current surge seen at the input and eliminates output voltage overshoot. Buck1 Buck2 Buck3 Active Discharge in Shutdown All AAT3607 synchronous buck converters have an internal 1 k resistor that discharges the output capacitor when the converter is off at LX node. The discharge resistors ensure that the load circuitry powers down quickly and completely. The internal discharge resistors are connected when a converter is disabled and when the device is in UVLO with an input voltage greater than 1.0 V. With an input voltage less than 1.0 V, the internal discharge resistors are not activated. Synchronous Buck Converters Phase Shift Converter phase shifting significantly reduces both input and output ripple current. Reducing ripple current allows for less input and output capacitance, reduces power dissipation, and improves efficiency. Figure 45 shows a comparison of the two approaches. Current Limit and Over-Temperature Protection Peak input current is limited for overload conditions. As load impedance decreases and the output voltage falls closer to zero, more power is dissipated internally, raising the device temperature. Thermal protection completely disables switching when internal dissipation becomes excessive, protecting the device from damage. The junction over-temperature threshold is 140 °C with 15 °C of hysteresis. If the junction temperature tc383 Figure 45. Buck Converter Phase Shifting Low Dropout Regulator The advanced circuit design of the linear regulator has been specifically optimized for very fast startup and shutdown timing. This proprietary LDO has also been tailored for superior transient response characteristics. These traits are particularly important for applications that require fast power supply timing. The high-speed turn-on capability is enabled through the implementation of a fast-start control circuit, which accelerates the power-up behavior of fundamental control and feedback circuits within the LDO regulator. Fast turn-off time response is achieved by an active output pull-down circuit, which is enabled when the LDO regulator is placed in shutdown mode. This active fast shutdown circuit has no adverse effect on normal device operation. The LDO regulator output has been specifically optimized to function with low cost, low ESR ceramic capacitors. However, the design allows for operation over a wide range of capacitor types. The regulator comes with complete short circuit and thermal protection. The combination of these two internal protection circuits gives a comprehensive safety system to guard against extreme adverse operating conditions. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30, 2014 17 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Charge Enable CEN = High No Yes VIN OVP Test VIN > VOVP Yes Shutdown No VIN UVLO Test VIN > VUVLO No Yes Preconditioning Test VMIN > VBAT Yes Preconditioning Current Charge Temperature Detection TJ > 140 °C No Yes No No CC Phase Test VBAT_EOC > VBAT Yes Constant Current Charge No CV Phase Test ITERM < IBAT Temperature Detection TJ > 110 °C Yes Yes Constant Voltage Charge Mode Thermal Loop Charge Current Reduction No No Recharge Test (VBAT_REG – 0.1) < VBAT Yes Sleep Mode tc384 Figure 46. Battery Charger Operation Flowchart Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 18 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Application Information RTERM 133 Battery Charger Figure 46 shows the battery charger operation flowchart. Programmable Charge Current The AAT3607 has two pins (IR0 and IR1) for two kinds of charge current level setting selected by ISEL. When ISEL is low, the constant charge current is set by the resistor connected between IR0 and ground; when ISEL is high, it is set by the resistor between IR1 and ground. The programmed charge current up to 1 A can be calculated by: I CH_CC RSET 2 KI SET RSET 2 I CH_CC KI SET Among them, KISET = 800. Table 5 gives the recommended 1% tolerance metal film resistance values for a desired constant current charge level. Table 5. Standard 1% Metal Film Resistor Values for Constant Current Setting ICH_CC (mA) RSET (k) 50 32.4 75 21.5 100 mA 10 3 26.7 k 500mA At this RTERM setting, when the other fast charge current is 300 mA set by IR1, according to the same charge termination current percentage (20%), the ICH_TERM is 60 mA when IR1 is active to set the fast charge current by ISEL = high. Floating the ITERM pin sets the termination charge current to a default 10% of the fast charge current. Table 6 shows some standard metal resistor values for different charge termination current percentages. Table 6. Standard 1% Metal Film Resistor Values for Charge Termination Current Percentage Setting. Charge Termination Current Percentage (%) RTERM (k) 10 13.3 or float 15 20 20 26.7 25 34 30 41.2 35 47.5 40 53.6 45 60.4 50 66.5 100 16 200 8.06 300 5.36 400 4.02 500 3.24 The AAT3607 has one status LED driver output with open drain structure. This single LED can indicate simple functions such as battery charging, charge complete, and charge disabled as shown in Table 7. 600 2.67 Table 7. LED Status at Different Charge States 700 2.32 Description EN LED Status 800 2 Battery charging high on 900 1.78 Charge complete high off 1000 1.60 Charge disabled low off Charge Status Indication Programmable Charge Termination Current Percentage Reverse Blocking The charge termination current percentage of fast charge current can be programmed by an external resistor connected between ITERM and GND. This resistance can be calculated by The AAT3607 includes internal circuitry that eliminates the need for series blocking diodes, reducing solution size and cost as well as dropout voltage relative to conventional battery chargers. When the input supply is removed or when VIN goes below the AAT3607 Under-Voltage Lockout (UVLO) voltage, or when VIN drops below VBAT, the AAT3607 automatically reconfigures its power switches to minimize current drain from the battery. RTERM 133 I CH _ TERM I CH_CC 10 3 when ICH_CC is the fast charge current. For example, if the design’s intended charge termination current is 100 mA for a 500 mA fast charge current set by IR0, then Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30, 2014 19 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER R2 VOUT 0.6V 1 R1 Charge Current Reduction In many instances, product system designers do not know the real properties of potential ports used to supply power to the battery charger. Typically, powered USB ports found on desktop and notebook PCs should supply up to 500 mA. In the event the input power being used to supply the charger is unable to provide the programmed fast charge current or if the system under charge must also share supply current with other functions, the AAT3607 automatically reduces charge current to maintain SYS voltage not less than 4.5 V typical value. or V R2 OUT 1 R1 0 . 6 V Table 8. Resistor Selection for Output Voltage Setting; Standard 1% Resistor Values Substituted Closest to the Calculated Values Step-down Converter Programmable Output Voltage For applications requiring an adjustable output voltage, the AAT3607 buck converter outputs can be externally programmed. Resistors R1 and R2 of Figure 47 program the output to regulate at a voltage higher than 0.6 V. To limit the bias current required for the external feedback resistor string while maintaining good noise immunity, the minimum suggested value for R1 is 59 k. Although a larger value further reduces quiescent current, it also increases the impedance of the feedback node, making it more sensitive to external noise and interference. Table 8 summarizes the resistor values for various output voltages with R1 set to either 59 k for good noise immunity or 316 k for reduced no load input current. The AAT3607, combined with an external feed-forward capacitor (C2 in Figure 47), delivers enhanced transient response for extreme pulsed load applications. The addition of the feed-forward capacitor typically requires a larger output capacitor C3 for stability. The external resistor sets the output voltage according to the following equation: VOUT (V) R1 = 59 k R2 (k) R1 = 316 k R2 (k) 0.8 19.6 105 0.9 29.4 158 1.0 39.2 210 1.1 49.9 261 1.2 59.0 316 1.3 68.1 365 1.4 78.7 422 1.5 88.7 475 1.8 118 634 1.85 124 655 2.0 137 732 2.5 187 1000 3.3 267 1430 L1 2.2 μH VIN C1 10 μF VOUT LX VIN C2 22 pF AAT3607 C3 10 μF FB PGND R1 59 kΩ R1 267 kΩ tc385 Figure 47. AAT3607 Basic Application Circuit with Programmable Output Voltage Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 20 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Low Dropout (LDO) Regulator Programmable Output Voltage For applications requiring an adjustable output voltage, the AAT3607 LDO regulator outputs can also be externally programmed similar to the buck converter outputs. The feedback voltage is also set to 0.6 V, so the values of R1 and R2 are determined by the equation: VOUT R2 0.6V 1 R1 or V R2 OUT 1 R1 0 . 6 V Inductor Selection The step-down converter uses peak current mode control with slope compensation to maintain stability for duty cycles greater than 50%. The output inductor value must be selected so the inductor current down slope meets the internal slope compensation requirements. For most designs, the AAT3607 operates with inductor values of 2.2 H to 3.3 H. Inductors with lower inductance values are physically smaller but generate higher inductor current ripple leading to higher output voltage ripple. Manufacturer specifications list both the inductor DC current rating, which is a thermal limitation, and the peak current rating, which is determined by the saturation characteristics. The inductor should not show any appreciable saturation under normal load conditions. Some inductors may meet the peak and average current ratings but still result in excessive losses due to a high DCR. Always consider the losses associated with the DCR and its effect on the total converter efficiency when selecting an inductor. Input Capacitor Select a 10 F to 22 F X7R or X5R ceramic capacitor for the input. To estimate the required input capacitor size, determine the acceptable input ripple level (VPP) and solve for CIN. The calculated value varies with input voltage and is a maximum when VIN is double the output voltage. C IN VOUT VOUT 1 VIN VIN VPP - ESR f SW I OUT Always examine the ceramic capacitor DC voltage coefficient characteristics when selecting the proper value. For example, the capacitance of a 10 F, 6.3 V, X5R ceramic capacitor with 5.0 V DC applied is actually about 6 F. The maximum input capacitor RMS current for a single converter is: I RMS I OUT VOUT VOUT 1 VIN VIN The input capacitor provides a low impedance loop for the edges of pulsed current drawn by the AAT3607. Low ESR/ESL X7R and X5R ceramic capacitors are ideal for this function. To minimize parasitic inductances, the capacitor should be placed as closely as possible to the IC. This keeps the high frequency content of the input current localized, minimizing EMI and input voltage ripple. In applications where the input power source lead inductance cannot be reduced to a level that does not affect the converter performance, a high ESR tantalum or aluminum electrolytic should be placed in parallel with the low ESR/ESL bypass ceramic capacitor. This dampens the high Q network and stabilizes the system. Output Capacitor The output capacitor limits the output ripple and provides holdup during large load transitions. A typical 4.7 F X5R or X7R ceramic capacitor typically provides sufficient bulk capacitance to stabilize the output during large load transitions and has the ESR and ESL characteristics necessary for low output ripple. The output voltage droop due to a load transient is dominated by the capacitance of the ceramic output capacitor. During a step increase in load current, the ceramic output capacitor alone supplies the load current until the loop responds. Within two or three switching cycles, the loop responds and the inductor current increases to match the load current demand. The relationship of the output voltage droop during the three switching cycles to the output capacitance can be estimated by: COUT 3 I LOAD VDROOP f SW Once the average inductor current increases to the DC load level, the output voltage recovers. The above equation establishes a limit on the minimum value for the output capacitor with respect to load transients. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30, 2014 21 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER TJ ( MAX ) pTOTAL JA TA Power Calculations There are three types of losses associated with the AAT3607 step-down converters: switching losses, conduction losses, and quiescent current losses. Conduction losses are associated with the RDS(ON) characteristics of the power output switching devices. Switching losses are dominated by the gate charge of the power output switching devices. At full load, with Continuous Conduction Mode (CCM), a simplified form of the losses is given by: VOUT 2 p BUCK I OUT RDS ( ON ) N RDS ( ON ) P VIN V 1 OUT VIN t SW f S I OUT VIN I Q V\ IN IQ is the step-down converter quiescent current. tSW is the switching time, RDS(ON)P and RDS(ON)N are the high side and low side switching MOSFETs’ on-resistance. VIN, VOUT and IOUT are the input voltage, the output voltage and the load current. Since R DS(ON), quiescent current, and switching losses all vary with input voltage, the total losses should be investigated over the complete input voltage range. For all the LDOs, PD(MAX) VIN VOUT I OUT ( MAX ) The total power losses of step-down converter and LDOs can be expressed as PTOTAL PBUCK p D( MAX ) Layout Considerations When laying out the PC board of the AAT3607, follow the guidelines below: For the best results physically place the battery pack as close to the AAT3607 BAT pin as possible. To minimize voltage drops on the PCB, keep the high current carrying traces adequately wide. For maximum power dissipation of the AAT3607 TQFN package, the exposed pad should be soldered to the board ground plane to further increase local heat dissipation. A ground pad below the exposed pad is strongly recommended. Evaluation Board Description The AAT3607 Evaluation Board is used to test the AAT3607 power management unit. A schematic diagram for the AAT3607 Evaluation Board is provided in Figure 48, and the board layer details are shown in Figure 49. The actual bill of materials required for the AAT3607 Evaluation Board is shown in Table 9. Package Information Package dimensions for the 28-pin TQFN package are shown in Figure 50. Tape and reel dimensions are shown in Figure 51. Given the total losses, the maximum junction temperature can be derived from the JA for the package. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 22 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A Data Sheet • AAT3620 Single Cell Li+ Switch Mode Battery Charger BAT U1 AAT3607 VIN 4.1 V to 5.5 V 23 RSET0 3.24 kΩ C1 10 μF 10 V RF11 59 kΩ RSET1 1.6 kΩ RTERM 13.3 kΩ JISEL RF12 59k 26 25 27 24 28 VIN BAT IR0 IR1 ITERM ISEL CEN SYS PB PGND RL11 215 kΩ LO1 2.8 V/150 mA 9 6 4 21 SYS 4.1 V to 5.5 V C3 10 μF RST LO1 LX1 LFB1 15 R2 100 kΩ 5 L1 2.2 μH 12 18 CL2 2.2 μF RL21 118 kΩ 20 LFB2 LX2 JENL1 13 JENL2 1 JENB1 2 JENB2 3 JENB3 BFB2 BO1 3 V/400 mA CB12 RB11 237 kΩ LO2 RL22 59 kΩ 14 R1 1 kΩ D1 Red BFB1 LO2 1.8 V/150 mA C2 10 μF CHG RL12 59 kΩ CL1 2.2 μF 17 JCEN 19 C4 10 μF 16 7 CB11 4.7 μF RB12 59 kΩ L2 2.2 μH CB22 11 RB21 118 kΩ ENL1 BO2 1.8 V/300 mA CB21 4.7 μF RB22 59 kΩ ENL2 LX3 8 L3 2.2 μH BO3 1.2 V/300 mA ENB1 BFB3 ENB2 ENB3 EP AGND 10 CB32 RB31 59 kΩ 22 CB31 4.7 μF RB32 59 kΩ 0 tc386 Figure 48. AAT3607 Evaluation Board Schematic (a) Top Layer (b) Bottom Layer tc387 Figure 49. AAT3607 Evaluation Board Layer Details Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201904D • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • August 27, 2013 9 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Table 9. AAT3607 Evaluation Board Bill of Materials (BOM) Component Part Number Description Manufacturer U1 AAT3607 PMU with OVP Dynamic Li-ion Charger C1, C2, C3, C4 GRM21BR71A106KE51 Cap Ceramic, 10 F, 0805 X7R, 10 V, 10% Skyworks Murata CB11, CB21, CB31 GRM188R60J475KE19 Cap Ceramic, 4.7 F, 0603 X5R, 6.3 V, 10% Murata CL1, CL2 GCM188R70J225KE22 Cap Ceramic, 2.2 F, 0603 X7R, 6.3 V, 10% Murata CB12, CB22, CB32 Not populated L1, L2, L3 LQH3NPN2R2NM0L 2.2 H, 73 m, 1.25 A, 20% Murata R1 RC0603FR-071KL Res, 1 k, 1/10W, 1% 0603 SMD Yageo R2 RC0603FR-07100KL Res, 100 k, 1/10W, 1% 0603 SMD Yageo RB11 RC0603FR-07237KL Res, 237 k, 1/10W, 1% 0603 SMD Yageo RB12, RB22, RB31, RB32, RF11, RF12, RL12, RL22 RC0603FR-0759KL Res, 59 k, 1/10W, 1% 0603 SMD Yageo RB21, RL21 RC0603FR-07118KL Res, 118 k, 1/10W, 1% 0603 SMD Yageo RL11 RC0603FR-07215KL Res, 215 k, 1/10W, 1% 0603 SMD Yageo RSET0 RC0603FR-073K24L Res, 3.24 k, 1/10W, 1% 0603 SMD Yageo RSET1 RC0603FR-071K6L Res, 1.6 k, 1/10W, 1% 0603 SMD Yageo RTERM RC0603FR-0713K3L Res, 13.3 k, 1/10W, 1% 0603 SMD Yageo D1 0805KRCT Red LED 0805 HB Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 24 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Pin 1 Dot by Marking 4.000 ± 0.050 2.600 ± 0.050 Detail "A" C0.3 4.000 ± 0.050 2.600 ± 0.050 Top View Bottom View 0.400 ± 0.050 0.430 ± 0.050 0.230 ± 0.050 0.750 ± 0.050 0.203 REF 0.050 ± 0.050 Pin 1 Indicator Side View All dimensions are in millimeters Detail "A" tc388 Figure 50. AAT3607 28-Pin, 4 mm 4 mm TQFN Package Dimensions 4.00 2.00 ± 0.05 1.10 Ø1.50 ± 0.10 5.50 ± 0.05 12.00 ± 0.30 1.75 ± 0.10 4.35 ± 0.10 0.30 ± 0.05 4.35 ± 0.10 8.00 ± 0.10 Pin 1 Location All dimensions are in millimeters tc186 Figure 51. AAT3607 Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 203236A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 30, 2014 25 DATA SHEET • AAT3607: PMU WITH OVP DYNAMIC LI-ION CHARGER Ordering Information Model Name Part Marking (Note 1) AAT3607: PMU with OVP Dynamic Li-ion Charger C1XYY Manufacturing Part Number AAT3607INJ-T1 Evaluation Board Part Number AAT3607INJ-EVB Note 1: XY = assembly and date code. Copyright © 2012 - 2014 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 26 June 30, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 203236A