DATA SHEET AAT2504 Adjustable Three-Channel Regulator General Description Features The AAT2504 is a three-channel regulator consisting of a step-down converter with an input voltage range of 2.7V to 5.5V plus two low dropout (LDO) linear regulators. The two LDOs have an input voltage range of 1.8V to 5.5V, making them well-suited for post regulating from the step-down converter. • 800mA Buck Converter ▪ VIN Range: 2.7V to 5.5V ▪ VOUT Range: 0.9V to VIN, Adjustable ▪ High Efficiency: 95% ▪ 2MHz Switching Frequency ▪ Synchronizable to External Clock ▪ Internal Soft Start • Two 300mA Linear Regulators ▪ LDO Input Voltage Range: 1.62V to 5.5V ▪ Low Dropout Voltage ▪ High Output Accuracy: ±1.5% • Low Total Quiescent Current IQ (80μA) • Independent Enable Pins • Over-Temperature Protection • QFN34-20 Package • -40°C to +85°C Temperature Range The step-down converter optimizes power efficiency throughout the load range. Pulling the MODE/SYNC pin high enables “PWM Only” operation, maintaining constant frequency and low output ripple across the operating range. Alternatively, the converter may be synchronized to an external clock to the MODE/ SYNC pin. The step-down converter delivers up to 800mA of output current. The switching frequency is 2MHz, minimizing the size of external components. The two LDOs (LDOA/LDOB) have independent inputs and are capable of delivering up to 300mA each. Ultra low input voltage on the VLDOA and VLDOB pins (down to 1.62V) allows for efficient post-buck regulation. A Power-OK (POK) function provides an open drain output signal when LDOA is within regulation. Both LDOs feature low quiescent current and a low dropout voltage. The output voltages for both LDOs are adjustable to as low as 0.6V. The linear regulators have independent Enable pins. Typical no load quiescent current is a low 80μA when the step-down converter and LDOs are enabled. Applications • • • • • Cellular Phones Digital Cameras Handheld Instruments Microprocessor/DSP Core/IO Power PDAs and Handheld Computers The AAT2504 is available in a Pb-free 3x4mm QFN34-20 package and is rated over the -40°C to +85°C temperature range. Typical Application L LX AAT2504 VIN VIN VOUT (Step-down) FB R1 OUTA R1A 100kΩ VLDOA VLDOB VP MODE/SYNC POK EN C OUT POK FBA OUTB OUTB R1B FBB ENA ENB OUTA R2B R2A 2.2μF R2 2.2μF PGND AGND Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 1 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Pin Descriptions Pin # Symbol 1 FBB 2 3 ENA ENB 4 MODE/SYNC 5 FB 6 AGND 7 PGND 8, 9 LX 10 11, 12 VP N/C 13 VIN 14 EN 15 POK 16 FBA 17 18 19 20 EP OUTA VLDOA VLDOB OUTB Function Feedback input pin for LDOB. This pin is used to regulate the output of LDOB to the desired value via an external resistor divider. Enable pin for LDOA. Active high. Enable pin for LDOB. Active high. PWM operation and oscillator synchronization pin. Connect to ground for PWM/Light Load operation and optimized efficiency throughout the load range. Connect high for low noise PWM operation under all operating conditions. When connected to an external clock, the internal oscillator is disabled and the step-down converter is synchronized to an external clock applied to this pin (PWM only). Feedback input pin for the step-down converter. This pin is used to see the output of the converter to regulate to the desired value via an external resistor divider. Ground connection pin. Main power ground return pin for the step-down converter. Connect to the output and input capacitor return. Connect inductor to this pin. Switching node internally connected to the drain of both high- and low-side MOSFETs. Input supply voltage for the converter. Must be closely decoupled. Not connected. Bias supply. Supply power for the internal circuitry. Connect to input power via low pass filter with decoupling to AGND. Enable for the step-down converter. Active high. Power-OK pin with open drain output. It is pulled low when the OUTA pin is outside the regulation window. Place a pull-up resistor between POK and OUTA. Feedback input pin for LDOA. This pin is used to regulate the output of LDOA to the desired value via an external resistor divider. LDOA output pin; should be closely decoupled with a low-ESR ceramic capacitor. Input voltage pin for linear regulator A; should be closely decoupled. Input voltage pin for linear regulator B; should be closely decoupled. LDOB output pin; should be closely decoupled with a low-ESR ceramic capacitor. Exposed paddle; connect to ground directly beneath the package. Pin Configuration QFN34-20 (Top View) OUTA VLDOA VLDOB OUTB 17 18 19 20 FBB ENA ENB MODE/SYNC FB AGND 1 16 2 15 3 14 4 13 5 12 6 11 FBA POK EN VIN N/C N/C 9 10 8 7 VP LX LX PGND 2 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Absolute Maximum Ratings1 Symbol VP, VIN, VLDO VLX VFB VEN TJ TLEAD Description Input Voltage and Bias Power to GND LX to GND FB to GND EN and EN_LDO to GND Operating Junction Temperature Range Maximum Soldering Temperature (at leads, 10 sec) Value Units 6.0 -0.3 to VP + 0.3 -0.3 to VP + 0.3 -0.3 to 6.0 -40 to 150 300 V V V V °C °C Value Units 2.0 50 W °C/W Thermal Information Symbol PD JA Description Maximum Power Dissipation (TA = 25°C) Thermal Resistance2 1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Mounted on an FR4 board. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 3 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Electrical Characteristics1 VIN = 3.6V; TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C. Symbol Description Bias Power Supply IQ Quiescent Current ISHDN Shutdown Current UVLO Under-Voltage Lockout Voltage Conditions Min ENA = ENB = EN = VIN; ILOAD = 0 ENA = ENB = EN = GND VIN Rising Hysteresis VIN Falling LDOA, LDOB VLDO Input Voltage VOUT Output Voltage Tolerance VFB VDO Feedback Voltage Dropout Voltage2, 3 Line Regulation4 Enable Threshold Low Enable Threshold High Output Current Shutdown Current Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis VLINEREG/VIN VEN(L) VEN(H) IOUT ISHT TSD THYS LDOA Power-OK Trip Threshold VPOK VPOKHYS Power-OK Hysteresis VPOK(LO) Power-OK Output Voltage Low IPOK Power-OK Output Leakage Current Step-Down Converter VIN Input Voltage VOUT Output Voltage Tolerance VOUT Programmable Range VOUT VFB Feedback Threshold Voltage ISHDN Shutdown Current ILX_LEAK LX Leakage Current IFB Feedback Leakage ILIM Current Limit RDS(ON)H High Side Switch On Resistance RDS(ON)L Low Side Switch On Resistance VLOADREG/VOUT Load Regulation VLINEREG/VIN Line Regulation Oscillator Frequency FOSC TSD Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis THYS VEN(L) Enable Threshold Low Enable Threshold High VEN(H) IEN EN Input Leakage IOUT = 1mA to 300mA TA = 25°C TA = -40°C to +85°C Typ Max Units 80 145 1.0 2.2 μA μA V mV V 5.5 1.5 2.5 0.607 300 0.09 0.6 V 250 1.7 1.62 -1.5 -2.5 0.593 0.6 IOUT = 300mA VIN = VOUT + 1 to 5.0V VLDO (MIN) = 2.5 VIN = 5V 1.4 300 1.0 140 15 VOUT Rising, TA = 25°C 80 90 1.0 ISINK = 1mA VPOK <5.5V, VOUT in Regulation IOUT = 0 to 800mA; VIN = 2.7V to 5.5V 98 0.4 1.0 2.7 -3.0 0.9 0.891 0.9 EN = GND VIN = 5.5, VLX = 0 - VIN VFB = 1.0V ILOAD = 10 to 800mA 1.6 280 160 0.2 0.2 2.0 140 15 5.5 3.0 VIN 0.909 1.0 1.0 0.2 1.2 2.4 0.6 VEN = 5V, VIN = 5V 1.4 -1.0 1.0 % V mV %/V V V mA μA °C °C % of VOUT % of VOUT V μA V % V V μA μA μA A m m % %/V MHz °C °C V V μA 1. The AAT2504 is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and correlation with statistical process controls. 2. VDO is defined as VIN - VOUT when VOUT is 98% of nominal. 3. For VOUT < 1.5V, VDO = 1.8 - VOUT. 4. CIN = 10μF. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Typical Characteristics–Step-Down Converter Step-Down Converter Efficiency vs. Output Current Output Voltage Error vs. Temperature (VOUT = 1.8V) (VIN = 3.6V; VOUT = 2.5V) 0.4 90 0.3 Efficiency (%) 80 70 60 VIN = 5.5V VIN = 4.2V 50 40 VIN = 3.6V 30 20 PWM/Light Load Mode VIN = 2.7V 10 Output Error (%) 100 Forced PWM Mode 1 10 100 0.1 0.0 -0.1 800mA 100mA -0.2 -0.3 -0.4 0 0.1 -0.5 -40 1000 -15 Output Current (mA) 35 60 85 Step-Down Converter Load Regulation Step-Down Converter Line Regulation (VOUT = 2.5V; Forced PWM) (VOUT = 2.5V; Forced PWM) 0.4 VIN = 3V 0.1 Output Voltage Error (%) Output Voltage Error (%) 10 Temperature (°C) 0.2 VIN = 3.6V 0.0 -0.1 VIN = 4.2V -0.2 VIN = 5.5V -0.3 0.3 50mA 1mA 0.2 100mA 0.1 0.0 600mA -0.1 800mA -0.2 0.1 1 10 100 1000 2.8 3.1 Output Current (mA) 3.7 4.0 4.3 4.6 4.9 5.2 Step-Down Converter Output Ripple Step-Down Converter Load Transient (VIN = 3.6V; VOUT = 1.8V; IOUT = 800mA) (VIN = 3.6V; IOUT = 300mA to 650mA) 1.79 1.0 0.8 0.6 0.4 0.2 Time (200ns/div) 2.2 Output Voltage (top) (V) 1.80 IINDUCTOR 5.5 2.0 VOUT 1.8 1.6 I OUT 0.9 IL 0.6 0.3 0.0 Load and Inductor Current (bottom) (A) VOUT Inductor Current (bottom) (A) 1.81 3.4 Input Voltage (V) 1.82 Output Voltage (top) (V) 400mA 600mA 0.2 Time (20µs/div) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 5 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Typical Characteristics–Step-Down Converter Step-Down Converter Line Transient No Load Quiescent Current vs. Input Voltage (VOUT = 1.8V; IOUT = 800mA; VIN = 3.6V-4.2V) (Step-Down Converter Enabled; Both LDOs Enabled) 4.0 3.5 0.02 0.00 -0.02 160 Quiescent Current (µA) Input Voltage (top) (V) 4.5 Output Voltage (AC Coupled) (bottom) (V) 5.0 140 120 85°C 100 25°C 80 60 -40°C 40 20 0 2.7 3.1 3.5 3.9 Time (20µs/div) Switching Frequency (MHz) Quiescent Current (µA) 110 100 90 85°C 70 25°C 50 40 -40°C 30 20 2.7 3.1 3.5 3.9 4.3 4.7 5.1 (VIN = 3.6V; VOUT = 1.2V) 600mA 2.00 1.90 1.85 1.80 1.75 5.5 -40 -15 10 35 60 Step-Down Converter Turn-Off (VIN = 3.6V; VOUT = 1.8V; IOUT = 800mA) (VIN = 3.6V; VOUT = 1.8V; IOUT = 800mA) VOUT 0V 1.5 1.0 0.5 IL 0.0 Time (50µs/div) 4 Enable (top) (V) VOUT (middle) (V) 0 6 EN 2 0 VOUT 1.8V IL 1.0 0V 0.5 0.0 Time (100µs/div) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 Inductor Current (bottom) (A) 1.8V Inductor Current (bottom) (A) EN 2 85 Temperature (ºC) 6 Enable (top) (V) VOUT (middle) (V) 800mA 400mA 1.95 Step-Down Converter Soft Start 4 5.5 2.05 Input Voltage (V) 6 5.1 Step-Down Converter Switching Frequency vs. Temperature (Step-Down Converter Enabled; Both LDOs Disabled) 60 4.7 Input Voltage (V) No Load Quiescent Current vs. Input Voltage 80 4.3 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Typical Characteristics–Step-Down Converter High Side Switch On Resistance vs. Input Voltage Low Side Switch On Resistance vs. Input Voltage 400 350 120°C 380 100°C RDS(ON)L (mΩ Ω) RDS(ON)H (mΩ Ω) 300 85°C 360 340 320 300 280 260 25°C 120°C 100°C 85°C 250 200 150 25°C 100 240 220 50 2.7 3.1 3.5 3.9 4.3 Input Voltage (V) 4.7 5.1 5.5 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 Input Voltage (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 7 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Typical Characteristics–LDO Regulator Dropout Voltage vs. Output Current Output Voltage vs. Input Voltage (VOUT = 2.5V) (VOUT = 2.5V) 2.8 180 2.7 85°C 160 Output Voltage (V) Dropout Voltage (mV) 200 25°C 140 120 100 80 60 -40°C 40 2.5 2.4 2.2 2.1 0 2.0 50 100 150 200 250 300mA 250mA 200mA 2.3 20 0 50mA 2.6 300 100mA 2.5 2.7 2.9 Output Current (mA) (VOUT = 3.3V) 3.5 160 85°C 140 25°C 120 50mA 3.4 Output Voltage (V) Dropout Voltage (mV) 3.5 Output Voltage vs. Input Voltage (VOUT = 3.3V) 100 80 60 -40°C 40 20 1mA 3.3 3.2 300mA 200mA 3.1 3.0 100mA 2.9 2.8 2.7 0 0 50 100 150 200 250 3.1 300 3.3 3.5 3.7 3.9 4.1 Output Current (mA) Input Voltage (V) LDO Output Voltage vs. LDO Input Voltage LDO Output Voltage vs. LDO Input Voltage (VOUTA = 1.5V; VIN = VP = 3.6V) (VOUTA = 1.8V; VIN = VP = 3.6V) 1.60 1.55 100mA 1.50 1.45 1.40 200mA 1.35 1.30 300mA 1.25 1.20 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 LDO Input Voltage (VLDOA/B) (V) 2.4 2.5 LDO Output Voltage (VOUTA) (V) LDO Output Voltage (VOUTA) (V) 3.3 Input Voltage (V) Dropout Voltage vs. Output Current 8 3.1 1.90 1.80 100mA 1.70 1.60 200mA 1.50 1.40 300mA 1.30 1.20 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 LDO Input Voltage (VLDOA/B) (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 2.4 2.5 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Typical Characteristics–LDO Regulator LDO Output Voltage Variation vs. Temperature LDO Line Regulation (VOUT = 2.5V) (VOUT = 2.5V) 0.4 Output Voltage Error (%) Output Voltage Error (%) 0.10 0.05 300mA 0.00 -0.05 200mA -0.10 -0.15 100mA -0.20 -0.25 -0.30 -40 -15 10 35 60 0.3 0.2 0.0 -0.1 1mA -0.2 3.1 3.5 Temperature (°C) -0.2 VIN = 4.2V -0.4 VIN = 5.5V 100 Output Voltage (AC coupled) (top) (mV) Output Voltage Error (%) VIN = 3.6V 0.0 10 5.1 5.5 50 25 0 -25 0.3 0.2 0.1 0.0 1000 Output Current (mA) Time (50µs/div) LDO Line Transient No Load Quiescent Current vs. Input Voltage (VOUT = 1.8V; IOUT = 300mA) (Both LDOs Enabled, Step-Down Converter Disabled) 0 -50 4.5 4.0 3.5 3.0 Time (50µs/div) 50 Quiescent Current (µA) 50 Input Voltage (bottom) (V) 100 Output Voltage (AC coupled) (top) (mV) 4.7 Output Current (bottom) (A) VIN = 2.7V 1 4.3 (VOUT = 1.8V) 0.4 -0.8 0.1 3.9 LDO Load Transient (VOUT = 2.5V) -0.6 200mA 300mA Input Voltage (V) LDO Load Regulation 0.2 50mA -0.3 -0.4 2.7 85 100mA 10mA 0.1 45 85°C 40 25°C 35 30 25 -40°C 20 15 10 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 Input Voltage (V) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 9 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Typical Characteristics–LDO Regulator Turn-On Time Turn-Off Time (VIN = 3.6V; VOUT = 1.8V; IOUT = 300mA) (VIN = 3.6V; VOUT = 1.8V; IOUT = 300mA) 0 1.5 1.0 0.5 0.0 Time (25µs/div) 10 Output Voltage (top) (V) Enable (top) (V) 2.0 2.0 1.5 1.0 0.5 0.0 4 2 0 Time (25µs/div) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 Enable (bottom) (V) 2 Output Voltage (bottom) (V) 4 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Functional Block Diagram FB Voltage Reference VIN DH Err. Amp. MODE/SYNC EN VP LX Logic Control Logic DL PGND OUTA VLDOA Err. Amp. ENB VLDOB ENA Err. Amp. Voltage Reference 90% VREF FBA POK OUTB FBB AGND Functional Description The AAT2504 is a high performance power management IC comprised of a step-down converter and two linear regulators. The step-down converter operates in both fixed and variable frequency modes for high efficiency performance. The switching frequency is 2MHz, minimizing the size of the inductor. The converter requires only three external power components (CIN, COUT, and L). Each LDO can deliver up to 300mA. Each regulator has independent input voltage and enable pins and operates with ceramic capacitors. Switch-Mode Step-Down Converter The switching regulator is a monolithic step-down converter operating with input voltage range of 2.7V to 5.5V. Power devices are sized for 800mA current capability and achieves over 95% efficiency. The internal oscillator operates at 2MHz, minimizing the cost and size of external components. Light Load operation maintains high efficiency under light load conditions (typically <50mA) when MODE/SYNC is grounded. The MODE/SYNC pin tied high allows optional “PWM Only” operation. This maintains constant frequency and low output ripple across all load conditions. Alternatively, by connecting an external clock to the AAT2504’s MODE/SYNC pin, the internal clock is disabled. The external synchronization must stay between 1MHz and 3MHz. The current through the P-channel MOSFET (high side) is sensed for current loop control, as well as 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 11 DATA SHEET AAT2504 Adjustable Three-Channel Regulator The output of the voltage error amplifier programs the current mode loop for the necessary peak switch current to force a constant output voltage for all load and line conditions. Internal loop compensation terminates the transconductance voltage error amplifier output. The internal error amplifier reference is fixed at 0.9V. A logic low on the EN pin shuts the converter down and makes it consume less than 1μA of current. Soft start increases the inductor current limit point in discrete steps when the input voltage or enable input is applied. It limits the current surge seen at the input and eliminates output voltage overshoot. For overload conditions, the peak input current is limited. 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. Linear Regulators The two linear regulators are high performance LDOs where each LDO sources 300mA of current. For added flexibility, both regulators have independent input voltages operating from 1.8V to 5.5V. An external feedback pin for each LDO allows programming the output voltage from 3.6V to 0.6V. The regulators have thermal protection in case of adverse operating conditions. LDOA features an integrated Power-OK comparator which indicates when the output is out of regulation. The POK is an open drain output and it is held low when the AAT2504 is in shutdown mode. Under-Voltage Lockout Internal bias of all circuits is controlled via the VIN pin. Under-voltage lockout guarantees sufficient VIN bias and proper operation of all internal circuits prior to activation. Over-Temperature Protection Thermal protection completely disables switching when internal dissipation becomes excessive. The junction over-temperature threshold is 140°C with 15°C of hysteresis. Once an over-temperature fault condition is removed, the output voltage automatically recovers. 12 Applications Information Step-Down Converter 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. The internal slope compensation for the AAT2504 stepdown converter is 0.51A/μs. This equates to a slope compensation that is 75% of the inductor current down slope for a 1.5V output and 2.2μH inductor. m= 0.75 ⋅ VO 0.75 ⋅ 1.5V A = = 0.51 L 2.2µH µs Manufacturer’s 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 yet 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. The 2.2μH CDRH2D14 series Sumida inductor has a 94m DCR and a 1.5A DC current rating. At full 800mA load, the inductor DC loss is 60mW which gives a 4.16% loss in efficiency for a 800mA, 1.8V output. Input Capacitor Select a 4.7μF to 10μF X7R or X5R ceramic capacitor for the input of the step-down converter. 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. CIN = V ⎞ VO ⎛ · 1- O VIN ⎝ VIN ⎠ ⎛ VPP ⎞ - ESR · FS ⎝ IO ⎠ VO ⎛ V ⎞ 1 · 1 - O = for VIN = 2 · VO VIN ⎝ VIN ⎠ 4 CIN(MIN) = 1 ⎛ VPP ⎞ - ESR · 4 · FS ⎝ IO ⎠ Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Always examine the ceramic capacitor DC voltage coefficient characteristics when selecting the proper value. For example, the capacitance of a 10μF, 6.3V, X5R ceramic capacitor with 5.0V DC applied is actually about 6μF. The maximum input capacitor RMS current is: IRMS = IO · VO ⎛ V ⎞ · 1- O VIN ⎝ VIN ⎠ The input capacitor RMS ripple current varies with the input and output voltage and will always be less than or equal to half of the total DC load current. VO ⎛ V ⎞ · 1- O = VIN ⎝ VIN ⎠ D · (1 - D) = 0.52 = 1 2 for VIN = 2 · VO: IRMS(MAX) = VO IO 2 ⎛ V ⎞ · 1- O The term V ⎝ V ⎠ appears in both the input voltage ripple and input capacitor RMS current equations and is a maximum when VO is twice VIN. This is why the input voltage ripple and the input capacitor RMS current ripple are a maximum at 50% duty cycle. IN IN The input capacitor provides a low impedance loop for the edges of pulsed current drawn by the AAT2504. Low ESR/ESL X7R and X5R ceramic capacitors are ideal for this function. To minimize stray inductance, 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. A laboratory test set-up typically consists of two long wires running from the bench power supply to the evaluation board input voltage pins. The inductance of these wires, along with the low-ESR ceramic input capacitor, can create a high Q network that may affect converter performance. This problem often becomes apparent in the form of excessive ringing in the output voltage during load transients. Errors in the loop phase and gain measurements can also result. Since the inductance of a short PCB trace feeding the input voltage is significantly lower than the power leads from the bench power supply, most applications do not exhibit this problem. 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 alu- minum electrolytic should be placed in parallel with the low ESR, ESL bypass ceramic. This dampens the high Q network and stabilizes the system. Configuration Output Voltage Inductor 0.9V Adjustable With External Feedback 1V, 1.2V 1.5V, 1.8V 2.5V, 3.3V 1.5μH 2.2μH 3.3μH Table 1: Inductor Values. Output Capacitor The output capacitor limits the output ripple and provides holdup during large load transitions. A 4.7μF to 10μF 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 · ΔILOAD VDROOP · FS 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. The internal voltage loop compensation also limits the minimum output capacitor value to 4.7μF. This is due to its effect on the loop crossover frequency (bandwidth), phase margin, and gain margin. Increased output capacitance will reduce the crossover frequency with greater phase margin. Adjustable Output Resistor Selection The output voltage on the step-down converter is programmed with external resistors R2 and R6. To limit the bias current required for the external feedback resistor string while maintaining good noise immunity, the minimum suggested value for R6 is 59k. Although a larger value will further reduce quiescent current, it will also Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 13 DATA SHEET AAT2504 Adjustable Three-Channel Regulator increase the impedance of the feedback node, making it more sensitive to external noise and interference. Table 2 summarizes the resistor values for various output voltages with R6 set to either 59k for good noise immunity or 221k for reduced no load input current. With enhanced transient response for extreme pulsed load application, an external feed-forward capacitor (C1 in Fig.3) can be added. VOUT (V) R6 = 59k R2 (k) R6 = 221k R2 (k) 0.9* 1.0 1.1 1.2 1.3 1.4 1.5 1.8 1.85 2.0 2.5 2.8 3.0 3.3 0 6.65 13.3 19.6 26.1 32.4 39.2 59.0 61.9 71.5 105 124 137 158 0 24.3 48.7 73.2 97.6 124 147 221 232 274 392 464 511 590 Table 2: Step-Down Converter Resistor Values for Various Output Voltages. Thermal Calculations There are three types of losses associated with the AAT2504 step-down converter: 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, assuming continuous conduction mode (CCM), a simplified form of the LDO losses is given by: PTOTAL = 2 O I · (RDSON(HS) · VO + RDSON(LS) · [VIN - VO]) VIN + (tsw · F · IO + IQ) · VIN IQ is the step-down converter quiescent current. The term tsw is used to estimate the full load step-down converter switching losses. For the condition where the step-down converter is in dropout at 100% duty cycle, the total device dissipation reduces to: PTOTAL = IO2 · RDSON(HS) + IQ · VIN Since RDS(ON), quiescent current, and switching losses all vary with input voltage, the total losses should be investigated over the complete input voltage range. Given the total losses, the maximum junction temperature can be derived from the JA for the QFN34-20 package which is 50°C/W. TJ(MAX) = PTOTAL · ΘJA + TAMB LDO Linear Regulator Input Capacitor A 1μF or larger capacitor is typically recommended for CIN in most applications. A CIN capacitor is not required for basic LDO regulator operation; however, if the AAT2504 is physically located more than three centimeters from an input power source, a CIN capacitor will be needed for stable operation. CIN should be located as closely to the device VLDO pins as practically possible. CIN values greater than 1μF will offer superior input line transient response and will assist in maximizing the highest possible power supply ripple rejection. Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for CIN. There is no specific capacitor ESR requirement for CIN; however, ceramic capacitors are recommended for CIN due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries in portable devices. Output Capacitor For proper load voltage regulation and operational stability, a capacitor is required between pins OUTA, OUTB, and GND. The COUT capacitor connection to the LDO regulator ground pin should be made as direct as practically possible for maximum device performance. The AAT2504 has been specifically designed to function with very low ESR ceramic capacitors. For best performance, ceramic capacitors are recommended. * For the 0.9V output, R6 is open. 14 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Typical output capacitor values for maximum output current conditions range from 1μF to 10μF. Applications utilizing the exceptionally low output noise and optimum power supply ripple rejection characteristics of the AAT2504 should use 2.2μF or greater for COUT. If desired, COUT may be increased without limit. In low output current applications where output load is less than 10mA, the minimum value for COUT can be as low as 0.47μF. Capacitor Characteristics Ceramic composition capacitors are highly recommended over all other types of capacitors for use with the AAT2504. Ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. A ceramic capacitor typically has very low ESR, is lower cost, has a smaller PCB footprint, and is nonpolarized. Line and load transient response of the LDO regulator is improved by using low ESR ceramic capacitors. Since ceramic capacitors are non-polarized, they are not prone to incorrect connection damage. Equivalent Series Resistance ESR is a very important characteristic to consider when selecting a capacitor. ESR is the internal series resistance associated with a capacitor that includes lead resistance, internal connections, size and area, material composition, and ambient temperature. Typically, capacitor ESR is measured in milliohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. Ceramic Capacitor Materials Ceramic capacitors less than 0.1μF are typically made from NPO or C0G materials. NPO and C0G materials generally have tight tolerance and are very stable over temperature. Larger capacitor values are usually composed of X7R, X5R, Z5U, or Y5V dielectric materials. NPO and C0G material types are not recommended for use with LDO regulators since the capacitor tolerance can vary more than ±50% over the operating temperature range of the device. A 2.2μF Y5V capacitor could be reduced to 1μF over temperature; this could cause problems for circuit operation. X7R and X5R dielectrics are much more desirable. The temperature tolerance of X7R dielectric is better than ±15%. Capacitor area is another contributor to ESR. Capacitors which are physically large in size will have a lower ESR when compared to a smaller sized capacitor of an equivalent material and capacitance value. These larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size. Consult capacitor vendor datasheets carefully when selecting capacitors for LDO regulators. Adjustable Output Resistor Selection The output voltage on the linear regulator is programmed with external resistors: R4 and R7 for LDOA and R5 and R8 for LDOB. Table 3 summarizes the resistor values for various output voltages with R4 and R5 set to either 59k for good noise immunity or 221k for reduced no load input current. LDO VOUT (V) R7, R8 = 59k R4, R5 (k) R7, R8 = 221k R4, R5 (k) 0.6* 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.8 1.85 2.0 2.5 3.3 0 19.6 29.4 39.2 49.9 59.0 68.1 78.7 88.7 118 124 137 187 267 0 75 113 150 187 221 261 301 332 442 464 523 715 1000 Table 3: LDO Linear Regulators Resistor Values for Various Output Voltages. POK Output LDOA of the AAT2504 features an integrated Power OK comparator which can be used as an error flag. The POK open drain output goes low when output voltage is 10% (typ) below its nominal regulation voltage. Additionally, any time LDOA is in shutdown, the POK output is pulled low. Connect a pull-up resistor from POK to OUTA. *For the 0.6V output, R7 and R8 are open. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 15 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Enable Function The AAT2504 features an LDO regulator enable/disable function. Each LDO has its own dedicated enable pin. These pins (ENA, ENB) are active high and are compatible with CMOS logic. To assure the LDO regulators will switch on, ENA/B must be greater than 1.4V. The LDO regulators will shut down when the voltage on the ENA/B pins falls below 0.6V. In shutdown, the LDO regulators will consume less than 1.0μA of current. If the enable function is not needed in a specific application, it may be tied to VIN to keep the LDO regulator in a continuously on state. Thermal Protection Each of the two LDOs of the AAT2504 has an internal thermal protection circuit which will turn on when the device die temperature exceeds 140°C. The LDO regulator outputs will remain in a shutdown state until the internal die temperature falls back below the 125°C trip point. No-Load Stability The LDOs in the AAT2504 are designed to maintain output voltage regulation and stability under operational no-load conditions. This is an important characteristic for applications where the output current may drop to zero. to place a Schottky diode across VIN to VOUT (connecting the cathode to VIN and anode to VOUT). The Schottky diode forward voltage should be less than 0.45V. Thermal Considerations and High Output Current Applications The LDOs of the AAT2504 are designed to deliver continuous output load currents of 300mA each under normal operation. This is desirable for circuit applications where there might be a brief high in-rush current during a power-on event. The limiting characteristic for the maximum output load current safe operating area is essentially package power dissipation and the internal preset thermal limit of the device. In order to obtain high operating currents, careful device layout and circuit operating conditions need to be taken into account. The following discussions will assume the LDO regulator is mounted on a printed circuit board utilizing the minimum recommended footprint as stated in the layout considerations section of this document. At any given ambient temperature (TA), the maximum package power dissipation can be determined by the following equation: PD(MAX) = Reverse Output-to-Input Voltage Conditions and Protection Under normal operating conditions, a parasitic diode exists between the output and input of the LDO regulator. The input voltage should always remain greater than the output load voltage maintaining a reverse bias on the internal parasitic diode. Conditions where VOUT might exceed VIN should be avoided since this would forward bias the internal parasitic diode and allow excessive current flow into the VOUT pin, possibly damaging the LDO regulator. In applications where there is a possibility of VOUT exceeding VIN for brief amounts of time during normal operation, the use of a larger value CIN capacitor is highly recommended. A larger value of CIN with respect to COUT will effect a slower CIN decay rate during shutdown, thus preventing VOUT from exceeding VIN. In applications where there is a greater danger of VOUT exceeding VIN for extended periods of time, it is recommended 16 TJ(MAX) - TA θJA Constants for the AAT2504 are TJ(MAX) (the maximum junction temperature for the device, which is 125°C) and JA = 50°C/W (the package thermal resistance). Typically, maximum conditions are calculated at the maximum operating temperature of TA = 85°C and under normal ambient conditions where TA = 25°C. Given TA = 85°C, the maximum package power dissipation is 800mW. At TA = 25°C, the maximum package power dissipation is 2W. The maximum continuous output current for the AAT2504 is a function of the package power dissipation and the input-to-output voltage drop across the LDO regulator. To determine the maximum output current for a given output voltage, refer to the following equation. This calculation accounts for the total power dissipation of the LDO regulator, including that caused by ground current. PD(MAX) = [(VIN - VOUTA)IOUTA + (VIN · IGND)] + [(VIN - VOUTB)IOUTB + (VIN · IGND)] Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Layout 3. The suggested PCB layout for the AAT2504 is shown in Figures 1 and 2. The following guidelines should be used to help ensure a proper layout. 1. 2. The input capacitors (C4, C7, C8, and C9) should connect as closely as possible to VIN, VLDOA, VLDOB, VP, and PGND. The output capacitor (C5, and C6) of the LDOs connect as closely as possible to OUT. C2 and L1 should be connected as closely as possible. The connection of L1 to the LX pin should be as short as possible. Do not make the node small by using a narrow trace. The trace should be kept wide, direct, and short. 4. 5. The feedback trace should be separate from any power trace and connect as closely as possible to the load point. Sensing along a high-current load trace will degrade DC load regulation. Feedback resistors should be placed as closely as possible to VOUT to minimize the length of the high impedance feedback trace. If possible, they should also be placed away from the LX (switching node) and inductor to improve noise immunity. The resistance of the trace from the load return to the PGND should be kept to a minimum. This will help to minimize any error in DC regulation due to differences in the potential of the internal signal ground and the power ground. Ensure all ground pins are tied to the ground plane. No pins should be left floating. For maximum power dissipation, it is recommended that the exposed pad (EP) must be soldered to a good conductive PCB ground plane layer to further increase local heat dissipation. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 17 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Figure 1: AAT2504 Evaluation Board Top Side Layout. Figure 2: AAT2504 Evaluation Board Bottom Side Layout. SYNC U1 R10 100k VIN FB 5 MODE/SYNC 4 R1 AAT2504 FB LX 9 LX LX VOUT_BUCK L1 VIN 13 MODE/SYNC LX VIN OUTA Buckout 8 CDRH2D14 17 OUTA C2 10μF 100 3 2 1 C4 0.1μF VLDOA 18 VLDOA POK VLDOB FBA R3 15 100k 3 2 1 C8 1μF VINA VINB VLDOB 19 C9 1μF 16 FBA 20 OUTB 1 FBB C3 R2 C1 100pF .01μF R4 OUTA VP 10 VP OUTB EN FBB OUTB EN 14 1 2 3 EN ENB ENB 3 1 2 3 ENA 2 ENA R12 (open) ENB PGND ENA AGND R5 7 R7 59.0k R8 59.0k C6 2.2μF C5 2.2μF R6 59.0k 6 GND C7 10μF EP 1 2 3 GND GND POK POK GND VOUT_BUCK (V) 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.8 1.85 2.0 2.5 2.8 3.0 3.3 R2 (kΩ) 0 6.65 13.3 19.6 26.1 32.4 39.2 59 61.9 71.5 105 124 137 158 L1 (μH) 1.5 1.5 1.5 1.5 1.5 1.5 2.2 2.2 2.2 2.2 3.3 3.3 3.3 3.3 VOUT_LDO (V) 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.8 1.85 2.0 2.5 3.3 R4, R5 (kΩ) 19.6 29.4 39.2 49.9 59.0 68.1 78.7 88.7 118 124 137 187 267 U1 AAT2504 QFN34-20 L1 Sumida CDRH2D14 or Coltronics SD3812 C2, C7 10uF, 6.3V, X5R, 0805 GRM219R60J106KE19 C5, C6 2.2uF, 10V, X5R, 0603 GRM188R61A225KE34 C8, C9 1uF, 6.3V, X5R, 0603 GRM185R60J105KE26 Figure 3: AAT2504 Evaluation Board Schematic. 18 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Manufacturer Part Number Value (μF) Voltage Rating Temp. Co. Case Size Murata Murata Murata Murata Murata GRM219R60J106KE19 GRM188R60J475KE19 GRM188R61A225KE34 GRM188R61A105KA61 GRM185R60J105KE26 10 4.7 2.2 1.0 1.0 6.3 6.3 10 10 6.3 X5R X5R X5R X5R X5R 0805 0603 0603 0603 0603 Table 4: Surface Mount Capacitors. Manufacturer Part Number Inductance (μH) Saturated Rated Current (mA) DCR (m) Size (mm) LxWxH Type Sumida Sumida Sumida Coiltronics Coiltronics Coiltronics Taiyo Yuden Taiyo Yuden Taiyo Yuden CDRH2D14-1R5 CDRH2D14-2R2 CDRH2D14-3R3 SD3812-1R5 SD3812-2R2 SD3812-3R3 NR3010-1R5 NR3010-2R2 NR3010-3R3 1.5 2.2 3.3 1.5 2.2 3.3 1.5 2.2 3.3 1800 1500 1200 1580 1320 1100 1200 1100 870 63 94 125 78 111 159 80 95 140 3.2x3.2x1.55 3.2x3.2x1.55 3.2x3.2x1.55 4.0x4.0x1.2 4.0x4.0x1.2 4.0x4.0x1.2 3.0x3.0x1.0 3.0x3.0x1.0 3.0x3.0x1.0 Shielded Shielded Shielded Shielded Shielded Shielded Shielded Shielded Shielded Table 5: Suggested Inductors and Suppliers. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 19 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Ordering Information Voltage Package Channel 1 Channel 2 Channel 3 Marking1 Part Number (Tape and Reel)2 QFN34-20 0.9V 0.6V 0.6V XWXYY AAT2504IZL-BAA-T1 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. Legend Voltage Code Adjustable (0.6V) 0.9 1.2 1.5 1.8 1.9 2.5 2.6 2.7 2.8 2.85 2.9 3.0 3.3 4.2 A B E G I Y N O P Q R S T W C 1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD. 20 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 DATA SHEET AAT2504 Adjustable Three-Channel Regulator Package Information QFN34-201 Detail "A" Index Area (D/2 x E/2) Detail "B" 4.00 ± 0.05 0.925 ± 0.125 7.5° ± 7.5° 0.025 ± 0.025 0.214 ± 0.036 Side View 3.00 ± 0.05 Top View Bottom View 0.40 ± 0.10 0.075 ± 0.075 Option B: R0.30 (4x) max Round corner 0.50 ± 0.05 Option A: C0.30 (4x) max Chamfered corner 0.24 ± 0.06 Pin 1 indicator (optional) Detail "A" Detail "B" All dimensions in millimeters. 1. The leadless package family, which includes QFN, TQFN, DFN, TDFN and STDFN, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. A solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder connection. Copyright © 2012, 2013 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202017B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 19, 2013 21