ACT4527 Rev 1, December 28th, 2015 40V/3.0A CV/CC Buck Converter Featuring USB-PD GENERAL DESCRIPTION FEATURES ACT4527 is a wide input voltage, high efficiency step-down DC/DC converter that operates in either CV (Constant Output Voltage) mode or CC (Constant Output Current) mode. ACT4527 has an interface for USB-PD control via a tri-state digital pin. Vout is 5.1V if this pin is floating, Vout is 9.1V when this pin voltage is less than 0.8V and Vout is 12.1V while this pin voltage is more than 2.0V. USB-PD Support 40V Input Voltage Surge 4.5V-36V Operational Input Voltage 5.1V/9.1V/12.1V Output with +/-1% Accuracy Up to 3.0A Output current Constant Current Regulation Limit Hiccup Mode Protection at Output Short >90% Efficiency at Full Load 0.5mA Low Standby Input Current 5.7V/10.1V/13.5V Output Over-voltage Protection for 5.1V/9.1V/12.1V Outputs Cord Voltage Compensation Meet EN55022 Class B Radiated EMI Standard SOP-8EP Package ACT4527 has accurate output current limits under constant current regulation. It provides up to 3.0A output current at 125kHz switching frequency. ACT4527 utilizes adaptive drive technique to achieve good EMI performance while main >90% efficiency at full load for mini size CLA designs. It also has output short circuit protection with hiccup mode. The average output current is reduced to below 6mA when output is shorted to ground. Other features include output over voltage protection and thermal shutdown. APPLICATIONS Car Charger Cigarette Lighter Adaptor (CLA) Rechargeable Portable Device CV/CC regulation DC/DC converter This device is available in a SOP-8EP package and require very few external components for operation. Typical Application Circuit CSN 4.5V to 40V C3 22nF HSB 5V/9V/12V SW IN L1 40ìH ACT4527 CSP C1 47ìF C2 10ìF Rcs 20mÙ Vout GND PDC D1 SK54L C4 C5 22ìF 220ìF C6 2.2ìF CC1 CC2 GND I/O CC1 CC2 USB-PD Controller Vout V/I Profile 12.1V 9.1V 5.1V 3.2V * Patent Pending Innovative PowerTM 3.3A -1- Iout www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT4527 Rev 1, December 28th, 2015 ORDERING INFORMATION PART NUMBER OPERATION TEMPERATURE RANGE PACKAGE FREQUENCY PACKING ACT4527YH-T -40°C to 85°C SOP-8EP 125kHz TAPE & REEL PIN CONFIGURATION CSP 1 8 HSB CSN 2 7 SW 6 IN 5 NC ACT4527 PDC 3 NC 4 GND EP SOP-8EP Top View Innovative PowerTM -2- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT4527 Rev 1, December 28th, 2015 PIN DESCRIPTIONS PIN NAME DESCRIPTION 1 CSP Voltage Feedback Input. Connect to node of the inductor and output capacitor. CSP and CSN Kevin sense is recommended. 2 CSN Negative input terminal of output current sense. Connect to the negative terminal of current sense resistor. 3 PDC USB-PD Control Pin. floating: 5.1V, pulled high: 12.1V, pulled low: 9.1V. Do not drive this pin higher than 5V. 4 NC No Connection Pin. Must leave this pin floating. 5 NC No Connection Pin. Must leave this pin floating. 6 IN Power Supply Input. Bypass this pin with a 10ìF ceramic capacitor to GND, placed as close to the IC as possible. 7 SW Power Switching Output to External Inductor. 8 HSB High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver. Connect a 22nF capacitor from HSB pin to SW pin. 9 GND Ground and Heat Dissipation Pad. Connect this exposed pad to large ground copper area with copper and vias. ABSOLUTE MAXIMUM RATINGS PARAMETER VALUE UNIT -0.3 to 40 V SW to GND -1 to VIN +1 V HSB to GND VSW - 0.3 to VSW + 7 V CSP, CSN to GND -0.3 to +15 V PDC to GND -0.3 to +6 V All other pins to GND -0.3 to +6 V 46 °C/W Operating Junction Temperature -40 to 150 °C Storage Junction Temperature -55 to 150 °C 300 °C IN to GND Junction to Ambient Thermal Resistance Lead Temperature (Soldering 10 sec.) : Do not exceed these limits to prevent damage to the device. Exposure to absolute maximum rating conditions for long periods may affect device reliability. Innovative PowerTM -3- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT4527 Rev 1, December 28th, 2015 ELECTRICAL CHARACTERISTICS (VIN = 12V, TA = 25°C, unless otherwise specified.) Parameter Input Over Voltage Protection Symbol VIN_OVP Condition Rising Min Typ Max Unit s 40 42 44 V Input Over Voltage Hysteresis Input Over Voltage Response Time Input Under Voltage Lockout (UVLO) T_VIN_OVP VIN 4 V VIN step from 30V to 45V 250 ns Rising 4.5 V 200 mV Input UVLO Hysteresis Input Voltage Power Good Deglitch Time No OVP 40 ms Input Voltage Power Good Deglitch Time No UVP 10 us Input Standby Current Vin=12V, Vout=5.1V, Iload=0 500 uA Output Voltage Regulation CSP 5.05 5.1 5.15 9.0 9.1 9.2 11.95 12.1 12.25 V 5.7 Output Over Voltage Protection (OVP) Output rising 10.1 V 13.5 Output Over Voltage Deglitch Time 1.0 Output Voltage Cord Compensation 60 mV between CSP and CSN -15% 200 +15% mV -10% 3.2 10% V Output Under Voltage Protection (UVP) VOUT VOUT falling UVP Hysteresis VOUT VOUT rising UVP Deglitch Time VOUT UVP Blanking Time at Startup Output Constant Current Limit us Rcs=20mÙ 3.1 Hiccup Waiting Time 0.2 V 10 us 3.5 ms 3.3 3.5 A 4.13 S 5.8 A Top FET Rdson 70 mΩ Bottom FET Rdson 4.7 Ω Top FET Cycle by Cycle Current Limit Innovative PowerTM 4.5 -4- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT4527 Rev 1, December 28th, 2015 ELECTRICAL CHARACTERISTICS (VIN = 12V, TA = 25°C, unless otherwise specified.) Parameter Symbol Condition Min Maximum Duty Cycle 99 Switching Frequency -10% Soft-start Time Typ Max Units % 125 +10% kHz 2.0 ms Out Voltage Ripples Cout=220uF/22uF ceramic 80 mV VOUT Discharge Current For high to lower voltage transitions 60 mA Voltage transition time 12V-5V 100 ms Voltage transition time 5V-12V 100 ms Line Transient Response Input 12V-40V-12V with 1V/us slew rate, Vout=5V, Iload=0A and 2.4A 4.75 5.25 V Vout=5V 80mA-1.0A-80mA load with 0.1A/us slew rate 4.9 5.15 5.4 V Vout=9V 80mA-1.0A-80mA load with 0.1A/us slew rate 8.7 9.1 9.5 V Vout=12V 80mA-1.0A-80mA load with 0.1A/us slew rate 11.6 12.1 12.6 V Load Transient Response Thermal Shut Down 160 °C Thermal Shut Down Hysteresis 30 °C PDC Floating 1.5 V PDC High 2.0 V PDC Low 0.8 V PDC Maximum Voltage 5.5 V PDC Drive Current Innovative PowerTM 10 -5- uA www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT4527 Rev 1, December 28th, 2015 FUNCTIONAL BLOCK DIAGRAM HSB VIN UVLO PWM Controller PDC 70mΩ Driver SW 4.7Ω OVP Current Sense and Control CSP CSN GND FUNCTIONAL DESCRIPTION There is a under voltage protection (UVP) threshold. If the UVP threshold is hit for 10us, an over current or short circuit is assumed, and the converter goes into hiccup mode by disabling the converter and restarts after hiccup waiting period. Output Current Sensing and Regulation Sense resistor is connected to CSP and CSN. The sensed differential voltage is compared with interval reference to regulate current. CC loop and CV loop are in parallel. The current loop response is allowed to have slower response compared to voltage loop. However, during current transient response, the inductor current overshoot/undershoot should be controlled within +/-25% to avoid inductor saturation. Cord Compensation In some applications, the increased with output current potential voltage drop across compensation is based on the resistance. Cycle-by-Cycle Current Control output voltage is to compensate the output cable. The high side feedback The conventional cycle-by-cycle peak current mode is implemented with high-side FET current sense. The compensation voltage is derived as: Input Over Voltage Protection This voltage difference could be added on the reference or turning the (VCSP-VCSN) voltage into a sink current at FB pin to pull Vout higher than programmed voltage. ÄVout = (VCSP-VCSN)*K The converter is disabled if the input voltage is above 42V (+/-2V). Device resumes operation automatically 40ms after OVP is cleared. The cord compensation loop should be very slow to avoid potential disturbance to the voltage loop. The voltage loop should be sufficiently stable on various cord compensation setting. Output Over Voltage Protection Device stops switching when output over-voltage is sensed, and resumes operation automatically when output voltage drops to OVP- hysteresis. Thermal Shutdown Output Over Voltage Discharge If the TJ increases beyond 160°C, ACT4527 goes into HZ mode and the timer is preserved until TJ drops by 30°C. Discharge circuit starts to discharge output through CSP pins when output over voltage is detected. Discharge circuit brings 12V down to 5V in less than 100ms. Output Under-Voltage Protection / Hiccup Mode Innovative PowerTM -6- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT4527 Rev 1, December 28th, 2015 APPLICATIONS INFORMATION current. The input capacitor should be placed close to the IN and GND pins of the IC, with the shortest traces possible. In the case of tantalum or electrolytic types, a ceramic capacitor is recommended to parallel with tantalum or Inductor Selection The inductor maintains a continuous current to the output load. This inductor current has a ripple that is dependent on the inductance value. Higher inductance reduces the peak-to-peak ripple current. The trade off for high inductance value is the increase in inductor core size and series resistance, and the reduction in current handling capability. In general, select an inductance value L based on ripple current VOUT × (VIN _VOUT ) requirement: L= (1) VIN fSW ILOADMAX K RIPPLE V RIPPLE I OUTMAX K RIPPLE R ESR a selected VOUT × (VIN _VOUT ) With inductor value the L × VIN × fSW peak-to-peak inductor current is estimated as: 1 ILPK = ILOADMAX + ILPK _ PK 2 1 I _ 2 LPK PK The output capacitor also needs to have low ESR to keep low output voltage ripple. The output ripple voltage is: Where IOUTMAX is the maximum output current, KRIPPLE is the ripple factor, RESR is the ESR of the output capacitor, fSW is the switching frequency, L is the inductor value, and COUT is the output capacitance. In the case of ceramic output capacitors, RESR is very small and does not contribute to the ripple. Therefore, a lower capacitance value can be used for ceramic type. In the case of tantalum or electrolytic capacitors, the ripple is dominated by RESR multiplied by the ripple current. In that case, the output capacitor is chosen to have sufficiently low ESR. (2) (3) For ceramic output capacitor, typically choose a capacitance of about 22µF. For tantalum or electrolytic capacitors, choose a capacitor with less than 50mÙ ESR. An 330µF or 470µF electrolytic capacitor is recommended. (4) The selected inductor should not saturate at ILPK. The maximum output current is calculated as: Rectifier Schottky Diode Use a Schottky diode as the rectifier to conduct current when the High-Side Power Switch is off. The Schottky diode must have current rating higher than the maximum output current and a reverse voltage rating higher than the maximum input voltage. Further more, the low forward voltage Schottky is preferable for high efficiency and smoothly operation. LLIM is the internal current limit. Input Capacitor The input capacitor needs to be carefully selected to maintain sufficiently low ripple at the supply input of the converter. A low ESR capacitor is highly recommended. Since large current flows in and out of this capacitor during switching, its ESR also affects efficiency. PCB Load Trace The input capacitance needs to be higher than 10µF. The best choice is the ceramic type. However, low ESR tantalum or electrolytic types may also be used provided that the RMS ripple current rating is higher than 50% of the output Innovative PowerTM (5) Output Capacitor The peak inductor current is estimated as: IOUTMAX = ILIM _ 2 28 f SW LC OUT electrolytic capacitor, which should be placed right next to the IC. Where VIN is the input voltage, VOUT is the output voltage, fSW is the switching frequency, ILOADMAX is the maximum load current, and KRIPPLE is the ripple factor. Typically, choose KRIPPLE = 30% to correspond to the peak-to-peak ripple current being 30% of the maximum load current. ILPK _ PK = V IN Kevin Sense Traces -7- Sense Resistor www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT4527 Rev 1, December 28th, 2015 APPLICATIONS INFORMATION PC Board Layout Guidance When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the IC. 1) Arrange the power components to reduce the AC loop size consisting of CIN, VIN pin, SW pin and the Schottky diode. 2) Place input decoupling ceramic capacitor CIN as close to VIN pin as possible. CIN is connected power GND with vias or short and wide path. 3) Use “Kelvin” or “4-wire” connection techniques from the sense resistor pads directly to the CSP and CSN pins. 4) Use copper plane and thermal vias for GND for best heat dissipation and noise immunity. 5) Use short trace connecting HSB-CHSB-SW loop. 6) SW pad is noise node switching from VIN to GND. It should be isolated away from the rest of circuit for good EMI and low noise operation. Innovative PowerTM -8- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT4527 Rev 1, December 28th, 2015 Typical Application Circuit CSN 4.5V to 40V IN C1 47ìF C2 10ìF C3 22nF HSB U1 ACT4527 Rcs 20mÙ 5V/9V/12V SW L1 40ìH CSP Vout C4 C5 22ìF 220ìF GND PDC D1 SK54L C6 2.2ìF CC1 CC2 GND I/O CC1 CC2 USB-PD Controller BOM List for 3.0A USB PD Car Charger ITEM REFERENCE DESCRIPTION MANUFACTURER QTY 1 U1 IC, ACT4527, SOP-8EP Active-Semi 1 2 C1 Capacitor, Electrolytic, 47µF/35V Murata, TDK 1 3 C2 Capacitor, Ceramic, 10µF/25V, 1206, SMD Murata, TDK 1 4 C3 Capacitor, Ceramic, 22nF/25V, 0603, SMD Murata, TDK 1 5 C4 Capacitor, Ceramic, 22µF/16V, 1206, SMD Murata, TDK 1 6 C5 Capacitor, Electrolytic, 220µF/16V Murata, TDK 1 7 C6 Capacitor, Ceramic, 2.2µF/16V, 0805, SMD Murata, TDK 1 8 L1 Inductor, 40µH, 4.0A, 20% 9 D1 Diode, Schottky, 40V/5A, SK54L Panjit 1 10 Rcs Chip Resistor, 20mΩ, 1206, 1% Murata, TDK 1 Innovative PowerTM 1 -9- www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT4527 Rev 1, December 28th, 2015 TYPICAL PERFORMANCE CHARACTERISTICS (Schematic as show in typical application circuit, Ta = 25°C, unless otherwise specified) Efficiency vs. Load current ( 5V Vout) Efficiency vs. Load current ( 9V Vout) VIN =12V 95 90 Efficiency(%) Efficiency (%) 90 ACT4529-002 ACT4529-001 100 95 100 85 VIN =24V 80 75 80 75 70 70 65 65 60 60 0 500 1000 1500 2000 2500 3000 0 500 Load Current (mA) Efficiency vs. Load current ( 12V Vout) 1500 2000 2500 3000 Output CC/CV Curve (5V Vout) VIN =12V 5.0 Output Voltage (V) VIN =24V ACT4529-003 90 ACT4529-004 6.0 95 Efficiency (%) 1000 Load Current (mA) 100 85 80 75 70 VIN =12V VIN =24V 4.0 3.0 2.0 1.0 65 60 0 0 500 1000 1500 2000 2500 3000 0 5000 1000 1500 2000 2500 3000 Load Current (mA) Output Current (mA) Output CC/CV Curve (9V Vout) Output CC/CV Curve (12V Vout) 10.0 12.0 Output Voltage (V) VIN =12V 6.0 ACT4529-006 8.0 3500 14.0 ACT4529-005 Output Voltage (V) VIN =12V VIN =24V 85 VIN =24V 4.0 10.0 VIN =24V VIN =12V 8.0 6.0 4.0 2.0 2.0 0 0 0 5000 1000 1500 2000 2500 3000 0 3500 1000 1500 2000 2500 3000 3500 Output Current (mA) Output Current (mA) Innovative PowerTM 5000 - 10 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT4527 Rev 1, December 28th, 2015 TYPICAL PERFORMANCE CHARACTERISTICS (Schematic as show in typical application circuit, Ta = 25°C, unless otherwise specified) Output Over Voltage (5V Vout) Start up into CC Mode ACT4527-008 ACT4527-007 CH1 CH1 VOUT = 5.1V RLORD = 1.5Ù IOUT = 2.65A VIN = 12V CH2 CH2 CH3 CH1: VIN, 10V/div CH2: VOUT, 2V/div CH3: IOUT, 2A/div TIME: 400µs/div CH1: VOUT, 1V/div CH2: SW, 10V/div TIME: 1ms/div Load Transient (80mA-1A-80mA) Vin=12V, Vout=5V Load Transient (1A-2.4A-1A) Vin=12V, Vout=5V ACT4527-010 ACT4527-009 CH1 CH1 CH2 CH2 CH1: VOUT, 100mV/div CH2: IOUT, 1A/div TIME: 400us//div CH1: VOUT, 200mV/div CH2: IOUT, 1A/div TIME: 400us//div Load Transient (80mA-1A-80mA) Vin=12.6V, Vout=12V Load Transient (1A-2.4A-1A) Vin=12.6V, Vout=12V ACT4527-012 ACT4527-011 CH1 CH1 CH2 CH2 CH1: VOUT, 200mV/div CH2: IOUT, 1A/div TIME: 400us//div Innovative PowerTM CH1: VOUT, 200mV/div CH2: IOUT, 1A/div TIME: 400us//div - 11 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT4527 Rev 1, December 28th, 2015 TYPICAL PERFORMANCE CHARACTERISTICS (Schematic as show in typical application circuit, Ta = 25°C, unless otherwise specified) Voltage Transient (5V-9V) Voltage Transient (9V-5V) ACT4527-014 ACT4527-013 CH1 CH1 CH1: VOUT, 2V/div TIME: 10ms//div CH1: VOUT, 2V/div TIME: 10ms//div Voltage Transient (5V-12V) Voltage Transient (12V-5V) ACT4527-016 ACT4527-015 CH1 CH1 CH1: VOUT, 2V/div TIME: 10ms//div Innovative PowerTM CH1: VOUT, 2V/div TIME: 10ms//div - 12 - www.active-semi.com Copyright © 2015 Active-Semi, Inc. ACT4527 Rev 1, December 28th, 2015 PACKAGE OUTLINE SOP-8EP PACKAGE OUTLINE AND DIMENSIONS SYMBOL DIMENSION IN MILLIMETERS DIMENSION IN INCHES MIN MAX MIN MAX A 1.350 1.727 0.053 0.068 A1 0.000 0.152 0.000 0.006 A2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.170 0.250 0.007 0.010 D 4.700 5.100 0.185 0.200 D1 3.202 3.402 0.126 0.134 E 3.734 4.000 0.147 0.157 E1 5.800 6.200 0.228 0.244 E2 2.313 2.513 0.091 0.099 e 1.270 TYP 0.050 TYP L 0.400 1.270 0.016 0.050 è 0° 8° 0° 8° Active-Semi, Inc. reserves the right to modify the circuitry or specifications without notice. Users should evaluate each product to make sure that it is suitable for their applications. Active-Semi products are not intended or authorized for use as critical components in life-support devices or systems. Active-Semi, Inc. does not assume any liability arising out of the use of any product or circuit described in this datasheet, nor does it convey any patent license. Active-Semi and its logo are trademarks of Active-Semi, Inc. For more information on this and other products, contact [email protected] or visit http://www.active-semi.com. ® is a registered trademark of Active-Semi. Innovative PowerTM - 13 - www.active-semi.com Copyright © 2015 Active-Semi, Inc.