P1595

UNISONIC TECHNOLOGIES CO., LTD P1595 Preliminary LINEAR INTEGRATED CIRCUIT 200KHZ, 1.5A PWM BUCK DC/DC CONVERTER DESCRIPTION The UTC P1595 is a monolithic integrated circuit intended for the use of a step-down DC/DC converter and it can drive a 1.5A load without additional transistors. The internal compensation makes feedback control having good line and load regulation without external design. The external shutdown function can be controlled by logic level and then enter the standby mode. The UTC P1595 features a guaranteed +3% tolerance on output voltage under specified input voltage and output load conditions. Thermal shutdown protection is designed to prevent over temperature operating from damage while current limit protection is against over current operating of the output switch. The switching frequency will be reduced if current limit function occurs and feedback voltage (VFB) drops below 0.5V. The UTC P1595 works at a 200kHz switching frequency so it allows smaller sized filter components. FEATURES * Output Voltage In Adjustable Output Version. * Adjustable Version Output Voltage Range: 0.75V ~ 22V With+3% Accuracy. * Short Circuit Protect * Fixed Switching Frequency: 200KHZ. * On/Off Shutdown Control Input. * Voltage Mode Non-Synchronous Pulse Width Modulation (PWM) Control. * Thermal-Shutdown And Current-Limit Protection. * Operating Voltage Can Be Up To 24V. * 1.5a Output Load Current. * Low Power Standby Mode. * Built-In Switching Transistor ORDERING INFORMATION Ordering Number P1595G-AB5-R Package SOT-89-5 Packing Tape Reel UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 1 of 6 QW-R103-047.b UNISONIC TECHNOLOGIES CO., LTD P1595 VCC 5 EN 4 Preliminary LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION 1 SW 2 GND SOT-89-5 3 FB PIN DESCRIPTION PIN NO. 1 2 3 4 5 PIN NAME SW GND FB EN VCC Switching Output Ground Feedback Voltage On/Off Pin Operating Voltage Input DESCRIPTION UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R103-047.b UNISONIC TECHNOLOGIES CO., LTD P1595 BLOCK DIAGRAM EN VCC Preliminary LINEAR INTEGRATED CIRCUIT CURRENT SOURCE BIAS 0.75V REFERENCE 2.5V REGULATOR START UP COMP. + - + FB - EA + PWM - latch Driver 0.4V + 200KHz OSC. Thermal Shutdown SW GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R103-047.b UNISONIC TECHNOLOGIES CO., LTD P1595 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Maximum Supply Voltage VCC +26 V ON/OFF Pin Input Voltage VEN -0.3 ~ VCC V Feedback Pin Voltage VFB -0.3 ~ 12 V Operating Supply Voltage VOP 4.5~24 V Output Voltage to Ground VOUT -0.8 V Power Dissipation (Note 1) Ta=25°C PD 690 mW Operating Temperature TOPR -20 ~ +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. THERMAL DATA PARAMETER SYMBOL RATINGS UNIT Junction to Ambient (Note 1) θJA 180 °C/W Junction to Case (Note 1) θJC 38 °C/W Note: 1. It’s Measured with the PCB copper area (need connect to VSS pins) of approximately 1.5 in2(Multi-layer) ELECTRICAL CHARACTERISTICS (Ta=25°C, VCC=12V, ILOAD=0.2A, unless otherwise specified,) PARAMETER Feedback Voltage Saturation Voltage Quiescent Current Feedback Bias Current Shutdown Supply Current Current Limit SW Pin Leakage Current SW pin=0V SYMBOL TEST CONDITIONS VFB IOUT=0.2A IOUT=1.5A, No outside circuit VSAT VFB=0V force driver on IQ VFB=1.2V force driver off IFB IOUT=0.1A ISD VEN=0V Pear current, No outside circuit I(LIMIT) VFB=0V force driver on No outside circuit ISW(LEAK) VFB=1.0V force driver off VCC=24V force driver off FOSC FSCP DC VIH VIL IH IL TSD (Adjustable) When VFB