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P1580 Datasheet

2.5A STEP-DOWN SWITCHING REGULATOR

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UNISONIC TECHNOLOGIES CO., LTD
P1580
LINEAR INTEGRATED CIRCUIT
380KHz, 2.5A STEP-DOWN
SWITCHING REGULATOR
„ DESCRIPTION
The UTC P1580 is a current mode, PWM controller with 380kHz
fixed frequency. It achieves 2.5A continuous output current over a
wide input supply range with excellent load and line regulation. By
using an external compensation pin, this device offers user flexibility
in determining loop dynamic.
The UTC P1580 integrates control, monitor and protection
functions to provide a low cost and perfect power solution. The
device provides 3.5 to 28V wide range operating input and
high-efficiency up to 90%.
An Under- Voltage-Lock-Output (UVLO) circuit monitors the
supply voltage to prevent from wrong logic control. An internal
1.222V reference voltage provides low output voltage down to 1.22V
for further applications. The over-current protection of controller
monitors the output current by using the voltage drop across a
current sensing resistor. Additional under voltage protection monitors
the voltage on FB pin for short-circuits protection.
The UTC P1580 provides fast transient response and requires
very few external devices for operation.
„ FEATURES
* 2.5A Output Current
* 380kHz Frequency of Operation
* 3.5V to 28V Input Voltage Range
* 5μA Shutdown Supply Current
* Output Adjustable From 1.22 to 21
* Frequency Feedback at Short Circuit
* Thermal Shutdown
* Under Voltage Lock Output
* Current Mode With Low ESR Output Ceramic Capacitors
* Up to 90% Efficiency
* Frequency Synchronization Input
„ ORDERING INFORMATION
Ordering Number
P1580G-SH2-R
Package
HSOP-8
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2010 Unisonic Technologies Co., Ltd
1 of 6
QW-R103-049.A
Free Datasheet http://www.Datasheet4U.com




UTC

P1580 Datasheet Preview

P1580 Datasheet

2.5A STEP-DOWN SWITCHING REGULATOR

No Preview Available !

P1580
LINEAR INTEGRATED CIRCUIT
„ PIN CONFIGURATION
BS 1
8 SYNC
IN 2
7 EN
SW 3
6 COMP
GND 4
5 FB
„ PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
PIN NAME
BS
IN
SW
GND
FB
COMP
EN
SYNC
DESCRIPTION
Supply pin to the power transistor driver. Tie to external circuit to generate a local supply
voltage higher than the input voltage in order to fully turn on the internal power transistor.
Power Supply pin.
Power Switch Output pin.
Ground pin.
The output voltage feedback pin. It is also the inverting input of the error amplifier.
Compensation pin. It is also the output of the internal error amplifier.
(1). A RC network at this pin compensates the control loop.
(2). The voltage at this pin controls the peak current of the internal switch.
Regulator On/Off Control pin. Leave EN unconnected if unused. A low input at EN turns
on the converter, and a high input turns it off.
Synchronization Input - The sync pin is used to synchronize the internal oscillator to an
external signal.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 6
QW-R103-049.A
Free Datasheet http://www.Datasheet4U.com


Part Number P1580
Description 2.5A STEP-DOWN SWITCHING REGULATOR
Maker UTC
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