UNISONIC TECHNOLOGIES CO., LTD P1580 LINEAR INTEGRATED CIRCUIT 380KHz, 2.5A STEP-DOWN SWITCHING REGULATOR DESCRIPTION The UTC P1580 is a current mode, PWM controller with 380kHz fixed frequency. It achieves 2.5A continuous output current over a wide input supply range with excellent load and line regulation. By using an external compensation pin, this device offers user flexibility in determining loop dynamic. The UTC P1580 integrates control, monitor and protection functions to provide a low cost and perfect power solution. The device provides 3.5 to 28V wide range operating input and high-efficiency up to 90%. An Under- Voltage-Lock-Output (UVLO) circuit monitors the supply voltage to prevent from wrong logic control. An internal 1.222V reference voltage provides low output voltage down to 1.22V for further applications. The over-current protection of controller monitors the output current by using the voltage drop across a current sensing resistor. Additional under voltage protection monitors the voltage on FB pin for short-circuits protection. The UTC P1580 provides fast transient response and requires very few external devices for operation. FEATURES * 2.5A Output Current * 380kHz Frequency of Operation * 3.5V to 28V Input Voltage Range * 5μA Shutdown Supply Current * Output Adjustable From 1.22 to 21 * Frequency Feedback at Short Circuit * Thermal Shutdown * Under Voltage Lock Output * Current Mode With Low ESR Output Ceramic Capacitors * Up to 90% Efficiency * Frequency Synchronization Input ORDERING INFORMATION Ordering Number P1580G-SH2-R Package HSOP-8 www.unisonic.com.tw Copyright © 2010 Unisonic Technologies Co., Ltd Packing Tape Reel 1 of 6 QW-R103-049.A P1580 LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION BS 1 IN 2 SW 3 GND 4 8 SYNC 7 EN 6 COMP 5 FB PIN DESCRIPTION PIN NO. PIN NAME 1 BS 2 3 4 5 IN SW GND FB 6 COMP 7 EN 8 SYNC DESCRIPTION Supply pin to the power transistor driver. Tie to external circuit to generate a local supply voltage higher than the input voltage in order to fully turn on the internal power transistor. Power Supply pin. Power Switch Output pin. Ground pin. The output voltage feedback pin. It is also the inverting input of the error amplifier. Compensation pin. It is also the output of the internal error amplifier. (1). A RC network at this pin compensates the control loop. (2). The voltage at this pin controls the peak current of the internal switch. Regulator On/Off Control pin. Leave EN unconnected if unused. A low input at EN turns on the converter, and a high input turns it off. Synchronization Input - The sync pin is used to synchronize the internal oscillator to an external signal. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R103-049.A P1580 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM EN 7 UVLO Reference 1.22V FB 5 + EA - IN 2 OTP Rsense PWM + + - - S Q R Power Transistor Driver UVLO COMP 6 4 Slope COMP SYNC 8 3 SW GND 45K-380KHz 1 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw BS 3 of 6 QW-R103-049.A P1580 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (Note 3) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VIN 28 V Switch Voltage VSW -1~ VIN+1 V Boost Voltage VBS VSW+6 V Feedback Voltage VFB -0.3~6 V Enable/UVLO Voltage VEN -0.3~6 V Compensation Voltage VCOMP -0.3~6 V Synchronization Voltage VSYNC -0.3~6 V Junction Temperature TJ 150 °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. RECOMMENDED OPERATING CONDITIONS (Note 1) PARAMETER SYMBOL Input Voltage VIN Ambient Operating Temperature TA Note: The device is not guaranteed to function outside its operating rating. RATINGS 3.5~28 -40 ~ +125 UNIT V °C PARAMETER SYMBOL RATINGS Junction to Ambient θJA 105 Junction to Case θJC 50 Note: Measured on approximately 1” square of 1 oz. Copper surrounding device leads. UNIT °C/W °C/W THERMAL DATA (Note 1) ELECTRICAL CHARACTERISTICS (VIN=12V, TA=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN Feedback Voltage VFB 7V ≤ VIN ≤ 25V, VCOMP < 2V 1.198 Upper Switch Leakage VEN =0V, VSW =0V Current Limit ILIMIT 3.1 Current Limit Gain. GCOMP Output Current to Comp Pin Voltage Error Amplifier Voltage Gain AVEA Error Amplifier Transconductance GEA ΔIC =±10μA 680 Oscillator Frequency FOSC 342 Short Circuit Frequency FSC VFB=0V 40 Synchronization Frequency FSYNC Sync Drive 0 ~ 2.7V 370 Maximum DMAX VFB =1.0V Duty Cycle Minimum DMIN VFB =1.5V Switch VCESAT ISW =2A Enable Threshold VEN ICC > 100μA 0.9 Enable Pull Up Current IEN VEN =0V Shutdown ISHDN VEN ≤0.4V Supply Current VEN ≥2.6V; VFB =1.4V Quiescent IQ Current of Short Circuit ISC VIN=10V Thermal Shutdown TOTP Note: If the VIN voltage exceeding 23V under short circuit condition, there will be some risk. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TYP 1.222 0.1 3.3 MAX 1.246 10 3.3 UNIT V µA A 2.2 A/V 400 770 380 46 V/V µA/V KHZ KHZ KHZ % % mV V µA µA mA A °C 1000 418 54 660 90 0 400 1.1 0.1 5 1.7 1.8 160 1.3 8 4 of 6 QW-R103-049.A P1580 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT If the load current is applied in 2A, the input voltage can range from 7 to 28V. If the load current is applied in 2A, the input voltage can range from 4.4 to 28V. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R103-049.A P1580 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS Efficiency (%) Efficiency (%) 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-R103-049.A