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UNISONIC TECHNOLOGIES CO., LTD P34563 Preliminary LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 of 4 Copyright © 2014 Unisonic Technologies Co., Ltd QW-R103-074.a PWM CONTROL 3A STEP-DOWN CONVERTER  DESCRIPTION The UTC P34563 consists of step-down switching regulator with PWM control. The UTC P34563 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly forms 0 up to 100%. With the addition of an internal P-channel Power MOS, and a diode connected externally, these IC s can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the HSOP-8 package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 40V.  FEATURES * Input voltage: 8V~40V * Oscillation frequency: 100K/350KHz * Duty ratio: 0%~100% PWM control * Adjustable version output voltage range from 3.3V to 38V * Enable and auto restart function. * Short Circuit Protect (SCP). * Thermal Shutdown function / Internal OVP. * Built-in internal SW P-channel MOS.  ORDERING INFORMATION Ordering Number Package Packing Lead Free Halogen Free P34563L-SH2-T P34563G-SH2-T HSOP-8 Tube P34563L-SH2-R P34563G-SH2-R HSOP-8 Tape Reel (1) T: Tube, R: Tape Reel (2) SH2: HSOP-8 (3) L: Lead Free, G: Halogen Free P34563L-SH2-T (1)Packing Type (2)Package Type (3)Lead Free  MARKING INFORMATION PACKAGE MARKING HSOP-8

P34563 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 4 www.unisonic.com.tw Q W - R 1 0 3 - 0 7 4 . a  PIN CONFIGURATION EN/CT VSS VGATE VCC SW SENSE2 FB SENSE1 SW  PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION

1 EN/CT ON/OFF and auto restart control

2 V SS GND pin

3 VGATE Driver gate clamping pin.

4 V CC Operating voltage input

5 SW Switch pin.

6 SENSE1 Current sense input1

7 SENSE2 Current sense input2

8 FB Feedback pin

 BLOCK DIAGRAM

P34563 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 4 www.unisonic.com.tw Q W - R 1 0 3 - 0 7 4 . a  ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified.) PARAMETER SYMBOL RATINGS UNIT VCC Pin Voltage V CC V SS -0.3~VSS+45 V Feedback Pin Voltage V FB V SS-0.3~38 V EN/CT, OVP Pin Voltage V SS-0.3~6 V SENSE1,SENSE2 Pin Voltage V SS-0.3~38 V Switch Pin Voltage V SW V SS-0.3~VCC+0.3 V Power Dissipation P D (T J -TA)/ θJA W Operating Supply Voltage V OP +8~+40 V Output Current I OUT 0~3 A Operating Temperature T OPR -20~+125 °C Storage Temperature T STG -40~+165 °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 CHARACTERISTICS PARAMETER SYMBOL RATINGS UNIT Junction to Ambient θJA 143 °C/W Junction to Case θJC 15 °C/W  ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT FB V FB I OUT=10mA 1.08 1.10 1.12 V Under Voltage Lockout U VLO Falling 6 V UVLO Hysteresis 0.8 V OVP Detect Voltage V OVP FB Floating 1.250 V Line Regulation ∆ VOUT VCC=10~40V 0.5 1 % Load Regulation ∆ VOUT IOUT=0~1A, RSENSE=140mΩ 10 mV Quiescent Current I CCQ V FB>1.2V 3 7 mA Oscillator Frequency F OSC 80 100 120 KHz300 350 400 Max. Duty Cycle (ON) DC Force Driver On VFB=0.7V 100 % Min. Duty Cycle (OFF) Force Driver Off V FB=1.2V 0 % Internal MOSFET RDSON R DSON V CC=12V, VFB = 0.7V 110 170 m Ω Sense Voltage V SENSE V SENSE1-VSENSE2 150 mV Sense Voltage Hysteresis V SENSE-h 45 mV EN/CT Pin Logic Input Threshold Voltage VEN Shutdown Mode 0.3 V VCT Auto Restart, V FB<0.4V 0.5 1.5 V EN/CT Pin Current I EN/CT-C Charge Current -32 µA EN/CT Pin Current I EN/CT-D Discharge Current 1.5 µA Thermal Shutdown Temp T SD 160 °C Thermal Shutdown Hysteresis T SH 40 °C

P34563 Preliminary LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 4 www.unisonic.com.tw Q W - R 1 0 3 - 0 7 4 . a  TYPICAL APPLICATION CIRCUIT AL CAPACITOR 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.