UNISONIC TECHNOLOGIES CO., LTD

UD05154

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CMOS IC

www.unisonic.com.tw

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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 the

Enable pin. Other features like over current protection and over

temperature protection are built in.



FEATURES

SOT-25

1

3

5

2

4

* 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

* 50

μA Operating Quiescent Current

* Over Current Protection

* Internal Soft Startup of 300

μs (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