UNISONIC TECHNOLOGIES CO., LTD P3586 LINEAR INTEGRATED CIRCUIT PWM CONTROL 3A STEP-DOWN CONVERTER DESCRIPTION The UTC P3586 is a fixed 1.2MHz frequency, voltage mode, PWM controller with an internal power MOSFET. It supplies 3A continuous output current over a wide input supply range with excellent load and line regulation. An internal reference voltage source provides low output voltage down to 0.8V for further applications. A PWM control circuit can provide 0~100% duty ratio. The reliability of UTC P3586 achieved by such protection circuits. An UVLO (Under voltage lock output) circuit monitors the VCC supply voltage to prevent wrong logic controls. The controller’s OCP (Over current protection) circuit monitors the output current by using the voltage drop across the power MOSFET’s RDS saving the use of a current sensing resistor. Over current protection circuit also monitors the voltage on FB pin under short-circuit conditions. The UTC P3586 is generally applied in portable devices. For maximum flexibility in determining loop dynamic, this device is equipped with compensation pin. In addition, it is requiring less external components for operation due to its configuration. FEATURES * 3A Output Current * 1.2MHz Frequency * Input Voltage Range: 3.6V to 23V * 10μA Shutdown Supply Current * Output Voltage Varies from 0.8V to VCC * Frequency fold back at Short Circuit * Protection Circuits: UVLO, Thermal Shutdown, OCP *Low ESR Output Capacitor (Multi-Layer Chip Capacitor (MLCC)) Application. * Halogen Free ORDERING INFORMATION Ordering Number P3586G-S08-R Package SOP-8 www.unisonic.com.tw Copyright © 2010 Unisonic Technologies Co., Ltd Packing Tape Reel 1 of 6 QW-R103-050.A P3586 PIN CONFIGURATION LINEAR INTEGRATED CIRCUIT PIN DESCRIPTION PIN NO. PIN NAME 1 FB 2 EN 3 COMP 4 5, 6 7, 8 VCC SW VSS DESCRIPTION Feedback pin-An external resistor divider from the output to GND, tapped to the FB pin sets the output voltage. Regulator On/Off Control pin. A high input at EN turns on the converter, and a low input turns it off. Compensation pin- This node is the output of the error amplifier and the input to PWM comparator. Input Supply Pin. Power Switch Output pin GND pin UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R103-050.A P3586 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM EN 2 Reference Voltage Source and Bias Current Source UVLO FB 1 Current Limit EA + R + - - Q PMOS Driver PWM OTP 3 5,6 7,8 1.2MHz Oscillator UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw VCC + S + - COMP Short Circuit Signal OCP Soft Start 0.8V 4 SW VSS Short Circuit Signal 3 of 6 QW-R103-050.A P3586 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (Ta=25°C, unless otherwise specified ) PARAMETER SYMBOL RATINGS UNIT VCC Pin Voltage VCC -0.3 ~+23 V Feedback Pin Voltage VFB -0.3 ~ +6 V ON/OFF Pin Voltage VEN - 0.3 ~ VCC +0.3 V Switch Pin Voltage VSW - 0.3 ~ VCC+ 0.3 V Operating Supply Voltage VOP +3.6 ~ +20 V Power Dissipation PD Internally limited mW Operating Junction Temperature TJ -20 ~ +125 °C Storage Temperature TSTG -40 ~ +150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. THERMAL DATA PARAMETER SYMBOL RATINGS UNIT Junction to Ambient θJA 70 °С/W Junction to Case θJC 25 °С/W Notes: θJA is measured with the PCB copper area(need connect to SW pins) of approximately 1 in2(Multi-layer) ELECTRICAL CHARACTERISTICS (VIN = 12V, Ta= 25°C, unless otherwise specified.) PARAMETER Feedback Voltage Feedback Bias Current Switch Current Standby Current Quiescent Current Oscillation Frequency Frequency of Current Limit or Short Circuit Protect Line Regulation Load Regulation EN Pin Input Current Internal MOSFET RDS(ON) EN Pin Logic input threshold voltage Thermal Shutdown Temp Efficiency Soft Start Time SYMBOL VFB IFB(BIAS) IQ fOSC TEST CONDITIONS MIN IOUT=0.1A 0.784 IOUT=0.1A Pear current, No outside circuit 3.2 VFB=0.7V Force driver on VEN=0V No outside circuit VFB=0V Force driver on VFB=1.2V Force driver off Measure waveform at SW Pin 1.0 fOSC1 Measure waveform at SW Pin ISW ISTN-BY ΔVOUT VOUT ΔVOUT VOUT ISH ISL RDS(ON) VSH VSL TSD EFFI. TSS MAX 0.816 0.5 4.5 UNIT V μA A 10 μA 3 1.2 5 1.4 mA MHz 90 120 KHz VCC=5V-20V, IOUT=0.2A 1 2 % IOUT=0.2A-3A 0.2 0.5 % 0 110 70 30 1 150 100 μA μA mΩ mΩ V V °C % mS VEN=2.5V(ON) VEN=0.3V(OFF) VCC=5V,VFB=0V VCC=12V,VFB=0V High(regulator ON) Low(regulator OFF) 70 2.0 0.8 VIN = 12V, VOUT = 5V, IOUT = 3A UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TYP 0.80 0.1 0.3 160 88 2 5 4 of 6 QW-R103-050.A P3586 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT VCC+12V 1 ON/OFF C2 22uF (MLCC) C3 0.22µF (option) 2 R4 100K C6 0.1µF (option) R3 15K C7 10nF UTC P3586 FB Vss EN Vss 8 7 6 3 COMP SW 4 Vcc SW 5 C8 51pF 1 L1 10µH D1 D1N5822 VOUT=5V/3A 2 R1 6.8K R2 1.3K C1 0.33nF C4 22µF (MLCC) ⎛ R1 + R 2 ⎞ Notes: V ⎟ OUT = VFB × ⎜ ⎝ R2 ⎠ (C2 can choose 220uF Low ESR AL Cap Or 22uF MLCC Cap) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R103-050.A P3586 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS Output Voltage (mV) SW SW UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 6 QW-R103-050.A