UD05154

UD05154 UTC | Alldatasheet

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UNISONIC TECHNOLOGIES CO., LTD UD05154 Advance CMOS IC www.unisonic.com.tw 1 of 5 Copyright © 2020 Unisonic Technologies Co., Ltd QW-R115-040.a 1.5MHz, 1.5A, VFB=0.6V SYNCHRONOUS STEP-DOWN CONVERTER  DESCRIPTION UTC UD05154 devices are synchronous step -down converters optimized for small solution size and high efficiency. The devices integrate switches capable of delivering an output current up to 1.5A. The devices are based on an adaptive on time with valley current mode control scheme. Typical operating frequency is 1.5MHz at medium to heavy loads. The devices are optimized to achieve very low output voltage ripple even with small external components and feature an excellent load transient response. During a light load, the UD05154 automatically enter into Power Save Mode at the lowest quiescent current (50 μA typ) to maintain high efficiency over the entire load current range. In shutdown, the current consumption is reduced to 1 μA. The UD05154 provide an adjustable output voltage via an external resistor divider. The output voltage start -up ramp is controlled by an internal soft start, typically 300 μs. Power sequencing is possible by configuring th e Enable pin. Other features like over current protection and over temperature protection are built in.  FEATURES SOT-25 * 2.7V to 5.5V Input Voltage Range * 1.5MHz Typical Switching Frequency * Output Current up to 1.5A * Adaptive On-Time Current Control * Power Save Mode for Light Load Efficiency * 50μA Operating Quiescent Current * Over Current Protection * Internal Soft Startup of 300μs (Typ.) * Adjustable Output Voltage * Thermal Shutdown Protection  ORDERING INFORMATION Ordering Number Package Packing Lead Free Halogen Free UD05154L-AF5-R UD05154G-AF5-R SOT-25 Tape Reel (1) R: Tape Reel (2) AF5: SOT-25 (3) G: Halogen Free and Lead Free, L: Lead Free UD05154G-AF5-R (1)Packing Type (2)Package Type (3)Green Package

UNISONIC TECHNOLOGIES CO., LTD 2 of 5 www.unisonic.com.tw QW-R115-040.a  MARKING 5 4 U5154  PIN CONFIGURATION VIN 321 SWGNDEN FB  PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION

1 EN Enable pin

H: Normal operation；L: Shutdown

2 GND Ground Pin

3 SW Switch pin connected to the internal MOSFET switches and inductor terminal. Connect the inductor of the output filter to this pin.

4 VIN Power Supply Input Pin

5 FB Feedback pin for the internal control loop. Connect this pin to the external feedback divider.  BLOCK DIAGRAM EN FB Thermal Shutdown UVLO Control Logic Soft Start GM PWM Vref SW Current Limit Detect Gate Drive Valley Current Detect PMOS NMOS SW GND VIN

UNISONIC TECHNOLOGIES CO., LTD 3 of 5 www.unisonic.com.tw QW-R115-040.a  ABSOLUTE MAXIMUM RATING (TA=25°C, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Voltage range VIN 7 V EN Pin Voltage VEN 7 V Feedback Pin Voltage VFB 3.6 V Switch Pin Voltage VSW VIN+0.3 V Junction Temperature TJ +125 °C Operation Temperature Range TOPR -20 ~ +85 °C Storage Temperature Range TSTG -20 ~ +85 °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) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Input voltage range VIN 2.7 5.5 V Quiescent current into VIN pin IQ Close Loop, IOUT=0mA 50 uA Under voltage lock out VUVLO 2.2 V High-level input voltage VIH 0.85 V Low-level input voltage VIL 0.8 V Shutdown current into VIN pin ISD 1 μA EN leakage current IEN,LKG 1 μA Feedback regulation voltage VFB 0.6 V High-side FET on resistance RDS(on) ISW=500mA,VIN=3.6V 173 mΩ Low-side FET on resistance ISW=500mA,VIN=3.6V 105 mΩ Low-side FET valley current limit ILIM, LS 2.0 A High-side FET peak current limit ILIM, HS 3.6 A Switching frequency fSW ILOAD=1A 1.5 MHz Thermal Shutdown Threshold TSD 160 °C

UNISONIC TECHNOLOGIES CO., LTD 4 of 5 www.unisonic.com.tw QW-R115-040.a  DETAILED DESCRIPTION UD05154 operates with an adaptive on -time control scheme, which is able to dynamically adjust the on -time duration based on the input voltage and output voltage so that it can achieve relative constant fr equency operation. The d evice operates at typically 1.5 MHz frequency pulse width modulation (PWM) at moderate to heavy load currents. POWER SAVE MODE The device integrates a Power Save Mode with PFM to improve efficiency at light load. In Power Save Mode, the device only switches when the output voltage trips below a set threshold voltage. It ramps up the output voltage with several pulses and stops switching when the output voltage is higher than the set threshold voltage. PFM is exited and PWM mode entered in case the output current can no longer be supported in Power Save Mode. SOFT START After enabling the device, internal soft -start circuitry monotonically ramps up the output voltage which reaches nominal output voltage during a soft-start time of 300 μs (typical). This avoids excessive inrush current and creates a smooth output voltage rise slope. SHORT CIRCUIT PROTECTION To avoid mis-operation of the device, short circuit protection is implemented that latch output to GND when output short.

UNISONIC TECHNOLOGIES CO., LTD 5 of 5 www.unisonic.com.tw QW-R115-040.a  TYPICAL APPLICATION CIRCUIT VOUT 1.8V 22μF 240K Ω 1% 105KΩ 2.2μH VIN 2.7V~5.5V 10μF VIN EN GND SW FB CFB OPTI UTC UD05154 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.