UNISONIC TECHNOLOGIES CO., LTD

P1583

Preliminary

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

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Copyright © 2013 Unisonic Technologies Co., Ltd

QW-R103-071.a

380KHz, 2.5A STEP-DOWN

SWITCHING REGULATOR



DESCRIPTION

The UTC P1583 is a fixed 380kHz frequency, current mode, PWM

controller. It achieves 2.5A continuous output current over a wide input

supply range with excellent load and line regulation. Equipped with an

external compensation pin, this device offers user flexibility in determining

loop dynamic.

The UTC P1583 integrates controls, monitoring and protection functions

into a single 8-pin package to provide a low cost and perfect power

solution. The device provides wide 4 to 24V operating input range, also

highly efficient with peak operating efficiency at 90%.

An Under-Voltage-Lock-Output (UVLO) circuit monitors the Vin supply

voltage to prevent wrong logic controls. An internal 1.222V reference

provides low output voltage down to 1.22V for further applications. An

internal soft-start prevents the output voltage from overshoot as well as

limiting the input current. The controller’s over-current protection monitors

the output current by using the voltage drop across a current sensing

resistor. Additional under voltage protections monitor the voltage on FB pin

for short-circuit protections.

The UTC P1583 provides fast transient respond and requires very few

external devices for operation.



FEATURES

* 2.5A output current

* 380kHz frequency of operation

* 4V to 24V input voltage range

* 25μA shutdown supply current

* Output adjustable from 1.22 to 21V

* Frequency foldback at short circuit

* Thermal shutdown

* Under voltage lock output

* Current mode with low ESR output ceramic capacitors

* Up to 90% efficiency



ORDERING INFORMATION

Ordering Number

Package

Packing

Lead Free

Halogen Free

P1583L-SH2-R

P1583G-SH2-R

HSOP-8

Tape Reel