UNISONIC TECHNOLOGIES CO., LTD P4596 Preliminary LINEAR INTEGRATED CIRCUIT PWM CONTROL 3A STEP-DOWN CONVERTER DESCRIPTION The UTC P4596 consists of 3A step-down switching regulator with PWM control which includes a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. The UTC P4596 can provide low-ripple power, high efficiency, and excellent transient characteristics and an enable function, an over current protect function and a short circuit protect function are built inside, And the PWM control circuit can vary the duty ratio linearly from 100 down to 0%. This converter also includes an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. These ICs can work as step-down switching regulators with the addition of an internal P-channel Power MOS, a coil and a diode connected externally. They provide such outstanding features: low current consumption. It is also suitable for the operation via an AC adapter because this converter can accommodate an input voltage up to 40V. HSOP-8 FEATURES * Input voltage：8V~40V * Duty ratio：0%~100% PWM control * Enable with Soft-Start function * Oscillation frequency can be set by outside resistance * Current Limit, SCP and OTP ORDERING INFORMATION Ordering Number P4596G-SH2-R Package HSOP-8 Packing Tape Reel P4596G-SH2-R (1)Packing Type (1) R: Tape Reel (2)Package Type (2) SH2: HSOP-8 (3)Green Package (3) G: Halogen Free and Lead Free MARKING www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 4 QW-R103-064.b P4596 Preliminary PIN CONFIGURATION PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 8 PIN NAME EN/SS VSS VGATE VCC SW FB COMP OSC LINEAR INTEGRATED CIRCUIT DESCRIPTION Enable and Soft-start pin Ground Driver GATE clamping pin. IC power supply pin Switch pin. Feedback voltage Compensation pin Frequency Set Pin. BLOCK DIAGRAM EN/SS VCC BIAS 2.5V 1.23V REFERENCE REGULATOR START-UP OCP Oscillator 0.815 V FB + AMP - COMP. + COMP. - PWM VGATE VSS OTP COMP OSC UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw SW 2 of 4 QW-R103-064.b P4596 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (TA=25°C) PARAMETER SYMBOL RATINGS UNIT VCC Pin Voltage VCC VSS-0.3~VSS+45 V Feedback Pin Voltage VFB VSS-0.3~6 V EN/SS Pin Voltage VEN/SS VSS-0.3~6 V OSC Pin Voltage VOSC VSS-0.3~3 V COMP Pin Voltage VCOMP VSS-0.3~6 V VGATE Pin Voltage VGATE VSS-0.3~VCC V Switch Pin Voltage VSW VSS-0.3~VCC+0.3 V Power Dissipation PD Internally limited mW Operating Supply Voltage VOP 8~40 V Junction Temperature TJ -40~+125 °C Storage Temperature TSTG -65~+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. ELECTRICAL CHARACTERISTICS (VCC=12V, TA=25°C, unless otherwise specified) PARAMETER Feedback Voltage Quiescent Current Feedback Bias Current Shutdown Supply Current Current Limit Adjustable Frequency Range Short Frequency EN/SS Pin Shutdown Logic Input Threshold Voltage EN/SS Pull High Current Internal MOSFET RDSON SYMBOL VFB ICCQ IFB ISD ICL FOSC FOSC1 VCC=10V~30V MIN TYP IEN/SS RDSON VEN/SS=0V VCC=12V, VFB=0V MAX UNIT 0.800 0.815 0.830 V 3 0.1 56 300 50 380 55 mA μA μA A KHz KHz 0.8 V 180 μA mΩ 10 3.5 50 45 VENL UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TEST CONDITIONS VCC=10V~30V, IOUT=0~2A TJ=-20°C~125°C VFB=1V IOUT=0.1A VEN/SS=0V 8 80 6 3 of 4 QW-R103-064.b P4596 Preliminary LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT 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 4 of 4 QW-R103-064.b