UNISONIC TECHNOLOGIES CO., LTD USR1101 Preliminary LINEAR INTEGRATED CIRCUIT 5V/12V SYNCHRONOUS BUCK PWM DC-DC CONTROLLER DESCRIPTION The UTC USR1101 is a high efficiency synchronous buck PWM controller, with operating at fixed 300kHz frequency, Internal soft-start, frequency compensation networks and integrates all of the control, output adjustment, monitoring and protection functions into a single package. Adjustable over-current protection (OCP) monitors the voltage drop across the RDS(ON) of the lower MOSFET for synchronous buck PWM DC-DC controller. SOP-8 FEATURES * Operating with 5V or 12V supply voltage * Drives all low cost N-channel MOSFETs * PWM control mode * 300kHz fixed frequency * Internal soft-start * Over-current fault monitor on MOSFET, no current sense resistor required * RoHS compliant and 100% lead (Pb)-free ORDERING INFORMATION Ordering Number USR1101G-S08-R Package SOP-8 Packing Tape Reel USR1101G-S08-R (1)Packing Type (1) R: Tape Reel (2)Package Type (2) S08: SOP-8 (3)Green Package (3) G: Halogen Free and Lead Free MARKING www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 5 QW-R103-062.b USR1101 Preliminary LINEAR INTEGRATED CIRCUIT PIN CONFIGURATION BOOT 1 8 NC UGATE 2 7 OPS USR1101 GND 3 LGATE 4 6 FB 5 VCC PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 8 PIN NAME BOOT UGATE GND LGATE VCC FB OPS NC DESCRIPTION High-Side gate drive boost Upper gate driver output Ground Lower gate drive output Supply voltage Feedback voltage Over-current setting and shutdown No bonding UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R103-062.b USR1101 Preliminary LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 5 QW-R103-062.b USR1101 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Supply Voltage VCC 16 V Power Dissipation (TA=25°C) (Note 1) PD 0.625 W Storage Temperature TSTG -65~150 °C Junction Temperature TJ 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 Junction to Ambient SYMBOL θJA RATINGS 160 UNIT °С/W RECOMMENDED OPERATING CONDITIONS (Note 2) PARAMETER SYMBOL RATINGS UNIT Supply Voltage VCC 5±5%,12±10% V Ambient Temperature TA 0~70 °C Junction Temperature TJ 0~125 °C Notes: 1. θJA is measured in the natural convection at TA=25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard. 2. The device is not guaranteed to function outside its operating conditions. ELECTRICAL CHARACTERISTICS (VCC=5V/12V, TA=25°C, unless otherwise specified) PARAMETER VCC Supply Current Nominal Supply Current Power-On Reset POR Threshold Hysteresis Switcher Reference Reference Voltage Oscillator Free Running Frequency Ramp Amplitude PWM Controller Gate Drivers (VCC=12V) Dead Time Protection FB Under-Voltage Trip OC Current Source Soft-Start Interval SYMBOL ICC VCCRTH VCCHYS MIN UGATE and LGATE Open TYP MAX UNIT 6 15 mA 4.1 0.5 4.5 0.35 V V VCC Rising VREF VCC=12V 0.784 0.8 0.816 V fOSC ∆VOSC VCC=12V VCC=12V 250 300 1.5 350 kHz VP-P 100 ns 80 45 % μA ms TDT ∆FBUVT IOC TSS UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TEST CONDITIONS FB Falling 70 75 40 2.5 4 of 5 QW-R103-062.b USR1101 Preliminary LINEAR INTEGRATED CIRCUIT APPLICATION INFORMATION OCP Sense the low-side MOSFET’s RDS(ON) to set over-current trip point. Connecting a resistor (ROCSET) from this pin to the source of the upper MOSFET and the drain of the lower MOSFET sets the over-current trip point. ROCSET, an internal 40μA current source, and the lower MOSFET on resistance, RDS(ON), set the converter over-current trip point (IOCSET) according to the following equation: IOCSET 40A ROCSET 0.4V RDS(ON) of the lower MOSFET Shutdown Pulling low the OPS pin by a small single transistor can shutdown the UTC USR1101 PWM controller as shown in typical application circuit. TYPICAL APPLICATION CIRCUIT +5V~+12V VIN D1 1N4148 R1 10 UTC USR1101 1 5 C1 1µF 6 3 BOOT UGATE VCC NC FB OPS GND LGATE 2 C3 1µF C2 0.1µF M1 8 7 4 C4 470µF L1 3µH ROCSET M2 VOUT COUT 1000µF×3 Disable R2 32 R3 68 R4 C5 200-1k 0.1-0.33µF 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 5 of 5 QW-R103-062.b