UNISONIC TECHNOLOGIES CO., LTD UD05251 Preliminary LINEAR INTEGRATED CIRCUIT 1.2MHZ, 2.5A SYNCHRONOUS STEP-DOWN CONVERTER DESCRIPTION HSOP-8 The UTC UD05251 is a 1.2MHz constant frequency current mode PWM step-down converter. It is ideal for portable equipment requiring very high current up to 2.5A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The UTC UD05251 also can run at 100% duty cycle for low dropout operation, extending battery life in portable systems while light load operation provides very low output ripple for noise sensitive applications. The UTC UD05251 can supply up to 2.5A output current from a 2.6V to 4V input voltage and up to 3A output current from a 4V to 5.5V input voltage. The output voltage can be regulated as low as 0.8V. The high switching frequency minimizes the size of external components while keeping switching losses low. The internal slope compensation setting allows the device to operate with smaller inductor values to optimize size and provide efficient operation. The UTC UD05251 is available in adjustable (0.8V to VIN) output voltage. DFN-8(3x3) FEATURES * 2.6V to 5.5V Input Voltage Range * Output Voltages from 0.6V to VIN * High Efficiency: Up to 94% * 1.2MHz Constant Frequency Operation * Output Current: Up to 2.5A Output Current for VIN=2.6V~4V Up to 3A Output Current for VIN=4V~5.5V 1 * No Schottky Diode Required * Current Mode Operation for Excellent Line and Load Transient Response * Current limit, Enable function * Short Circuit Protect (SCP) * Build-in Soft Start function * ≤1µA Shutdown Current ORDERING INFORMATION Ordering Number UD05251G-SH2-B-R UD05251G-SH2-C-R UD05251G-K08-3030-R UD05251G-SH2-B-R Package HSOP-8 HSOP-8 DFN-8(3×3) Packing Tape Reel Tape Reel Tape Reel (1)Packing Type (1) R: Tape Reel (2)Pin Code (2) Refer to PIN CONFIGURATION (3)Package Type (3) SH2: HSOP-8, K08-3030: DFN-8(3×3) (4)Green Package (4) G: Halogen Free and Lead Free www.unisonic.com.tw Copyright © 2016 Unisonic Technologies Co., Ltd 1 of 5 QW-R115-005.c UD05251 Preliminary LINEAR INTEGRATED CIRCUIT MARKING HSOP-8 DFN-8(3×3) PIN CONFIGURATION SVIN 1 8 PVIN FB 2 7 LX UTC UD05251-B SGND 3 SVIN 1 8 PVIN NC 2 6 PGND UTC UD05251-C SGND 3 6 PGND GND GND 5 SGND EN 4 7 LX 5 EN FB 4 HSOP-8 HSOP-8 Top View SVIN 1 FB 2 SGND 3 EN 4 8 PVIN UTC UD05251 GND 7 LX 6 LX 5 PGND DFN-8(3×3) PIN DESCRIPTION PIN NO. HSOP-8 DFN-8(3×3) B C 1 1 1 2 4 2 3, 5 3 3 PIN NAME SVIN FB SGND 4 5 4 EN 6 6 5 PGND 7 7 6, 7 LX 8 - 8 2 8 - PVIN NC DESCRIPTION Signal Supply Input Pin Output Feedback pin Signal Ground Pin Enable pin H：normal operation L：Shutdown Power Ground Pin Switch output pin. Connect external inductor here. Minimize trace area at this pin to reduce EMI. Power Supply Input Pin UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R115-005.c UD05251 Preliminary LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM OSC SVIN SLOPE COMP PVIN + Isense AMP - REF 0.6V SET Soft-Star + FB Icomp + RESET PWM LOGIC NON-OVERLAP CONTROL LX - + Izero COMP Over-Temperature and Short-Circuit Protection SGND - PGND Enable Logic EN UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 5 QW-R115-005.c UD05251 Preliminary LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified) PARAMETER PVIN, SVIN Pin Voltage Feedback Pin Voltage EN Pin Voltage Switch Pin Voltage RATINGS UNIT VSS+6 V VIN+0.3 V VIN+0.3 V VIN+0.3 V HSOP-8 1 mW Power Dissipation PD DFN-8(3×3) 2 mW Junction Temperature TJ +125 °C Operating Temperature Range TOPR -40 ~ +85 °C Storage Temperature Range TSTG -40 ~ +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. SYMBOL VIN VFB VEN VLX THERMAL RESISTANCES CHARACTERISTICS PARAMETER SYMBOL RATING UNIT 40 °C/W Junction to Ambient θJA 50 °C/W Junction to Case θJC 15 °C/W Note: θJA is measured with the PCB copper area of approximately 1 in2 (Multi-layer). That need connect to exposed pad. HSOP-8 DFN-8(3×3) ELECTRICAL CHARACTERISTICS (VIN=VEN=3.6V, TA=25°C, unless otherwise specified) PARAMETER Supply Voltage Range SYMBOL VIN Feedback Voltage VFB Feedback Bias Current Quiescent Current Shutdown Supply Current IFB ICCQ ISD Switching Current Limit ILIMIT TEST CONDITIONS TA=+25°C TA=0°C≤TA ≤85°C TA=-40°C≤TA≤85°C VFB=0.65V VFB=0.8V VEN=0V VIN=2.6V~4V VIN=4V~5.5V VIN=2.6V~5.5V IOUT=0.01~2.5A LX Pin VFB=0V, IOUT=2A Line Regulation △VOUT/VOUT Load Regulation △VOUT/VOUT Oscillation Frequency FOSC RDS(ON) of P-CH MOSFET RDSON RDS(ON) of N-CH MOSFET (Note) RDSON EN Pin Logic Input Threshold VENL Voltage VENH EN Pin Input Current IEN Efficiency EFFI VIN=5V, VOUT=3.3V, IOUT=2A Thermal Shutdown TSD Thermal Shutdown Hysteresis TSH Note: Guaranteed by design. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN TYP MAX 2.6 5.5 0.5880 0.6000 0.6120 0.5865 0.6000 0.6135 0.5820 0.6000 0.6180 ±30 250 400 0.1 1 3.0 3.5 3.3 4 0.04 0.4 0.5 1 1 1.2 1.4 0.14 0.20 0.1 0.15 0.4 1.5 ±0.1 ±1 90 140 30 UNIT V V V V nA μA μA A A %/V % MHz Ω Ω V V μA % °C °C 4 of 5 QW-R115-005.c UD05251 Preliminary LINEAR INTEGRATED CIRCUIT FUNCTION DESCRIPTIONS Operation UTC UD05251 is a monolithic switching mode Step-Down DC-DC converter. It utilizes internal MOSFETs to achieve high efficiency and can generate very low output voltage by using internal reference at 0.6V. It operates at a fixed switching frequency, and uses the slope compensated current mode architecture. This Step-Down DC-DC Converter supplies 2500mA output current at input voltage range from 2.6V to 5.5V. Current Mode PWM Control Slope compensated current mode PWM control provides stable switching and cycle-by-cycle current limit for excellent load and line responses and protection of the internal main switch (P-CH MOSFET) and synchronous rectifier (N-CH MOSFET). During normal operation, the internal P-CH MOSFET is turned on for a certain time to ramp the inductor current at each rising edge of the internal oscillator, and switched off when the peak inductor current is above the error voltage. The current comparator, ICOMP, limits the peak inductor current. When the main switch is off, the synchronous rectifier will be turned on immediately and stay on until either the inductor current starts to reverse, as indicated by the current reversal comparator, IZERO, or the beginning of the next clock cycle. 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 5 of 5 QW-R115-005.c