UD05123 UTC | Alldatasheet
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UNISONIC TECHNOLOGIES CO., LTD UD05123 CMOS IC www.unisonic.com.tw 1 of 4 Copyright © 2022 Unisonic Technologies Co., Ltd QW-R115-021.E 2.25MHz, 1.2A, VFB=0.6V SYNCHRONOUS STEP-DOWN CONVERTER DESCRIPTION UTC UD05123 is a 2.25MHz constant frequency current mode PWM step-down converter. It is ideal for portable equipment requiring very high current up to 1.8A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The 2.5V to 5.5V input voltage range makes UTC UD05123 ideally suited for single Li-Ion, two to four AA battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications. Switching frequency is internally set at 2.25MHz, allowing the use of sma ll surface mount inductors and capacitors. The internal synchronous switch increases efficiency and decreases need of an external Schottky diode. Low output voltages are easily supported wi th the 0.6V feedback reference voltage.
FEATURES
- Input Voltage Range :2.5V~5.5V * Output Voltage: from 0.6V to VIN * High Efficiency: Up to 92% * Constant Frequency Operation: 2.25MHz * Output Current:1.2A * Quiescent Current: 50uA (input < 4.2V) * No Schottky Diode Required * 100% Duty Cycle in Dropout * 0.6V Reference Allows Low Output Voltages * Current Mode Operation for Excellent Line and Load Transient Response * Current limit, Enable function * Short Circuit Protect (SCP) * ≤1µA Shutdown Current ORDERING INFORMATION Ordering Number Package Packing Lead Free Halogen Free UD05123L-AF5-R UD05123G-AF5-R SOT-25 Tape Reel
UNISONIC TECHNOLOGIES CO., LTD 2 of 4 www.unisonic.com.tw Q W - R 1 1 5 - 0 2 1 . E MARKING PIN CONFIGURATION PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION
1 EN Enable pin
H: Normal operation；L: Shutdown
2 GND Ground Pin
3 SW Switch output pin. Connect external inductor here. Minimize trace area at this pin to reduce EMI.
4 V IN Power Supply Input Pin
5 FB Output Feedback pin
BLOCK DIAGRAM FB EN OSC SLOPE COMP SET PWM ISENSE AMP VIN4 SW3 GND2 IZERO COMP OVERLAP CONTROL NON- REF Soft-Star ICOMP RESET Enable Logic Over-Temperature and Short-Circuit Protection 0.6V LOGIC
UNISONIC TECHNOLOGIES CO., LTD 3 of 4 www.unisonic.com.tw Q W - R 1 1 5 - 0 2 1 . E ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT VIN Pin Voltage V IN 6 V Feedback Pin Voltage V FB V CC V EN Pin Voltage V EN V CC V Switch Pin Voltage V SW V CC V Junction Temperature T J +125 °C Operation Temperature Range T OPR -40 ~ +85 °C Storage Temperature Range T STG -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. THERMAL DATA PARAMETER SYMBOL RATINGS UNIT Junction to Ambient θJA 280 °C/W ELECTRICAL CHARACTERISTICS (VIN=VEN=3.6V, TA=25°C, unless otherwise specified) (Note 1) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Input Voltage Range (Note 2) V IN 2.5 5.5 V Feedback Voltage V FB V FB=0.6V 0.5880 0.6000 0.6120 V Feedback Bias Current I FB V FB=0.65V -30 +30 nA Quiescent Current I CC V FB=1V 50 90 μA Shutdown Supply Current I SD V EN=0V 0.1 1 μA Switching Current Limit I LIMIT V IN=5V 1.8 A Oscillation Frequency F OSC SW pin 2.25 MHz RDS(ON) of P-CH MOSFET R DSON I OUT=1.0A 0.26 0.33 Ω RDS(ON) of N-CH MOSFET R DSON I OUT=1.0A 0.26 0.33 Ω EN Pin Logic Input Threshold Voltage VENL 0.6 V VENH 1.3 V EN Pin Input Current I EN ±0.1 ±1 µA Note: 100% production test at +25°C. Specifications over t he temperature range are guaranteed by design and characterization.
UNISONIC TECHNOLOGIES CO., LTD 4 of 4 www.unisonic.com.tw Q W - R 1 1 5 - 0 2 1 . E 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. UTC reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. This document supersedes and replaces all information supplied prior to the publication hereof.