SC190CEVB datasheet(1/18 Pages) SEMTECH

номер детали	SC190CEVB

подробное описание детали	Synchronous Buck Converter with Programmable Output

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производитель	SEMTECH [Semtech Corporation]

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POWER MANAGEMENT

Synchronous Buck Converter

with Programmable Output

SC190

The SC190 is a synchronous step-down converter with

integrated power devices and an integrated front-end

LDO to minimize input supply ripple. Output voltage is

programmable using two control bits, eliminating the need

for feedback resistors tied to the output. The device is

offered in four distinct variants with each variant providing

four ﬁxed output voltage options to choose from.

The front-end LDO can be bypassed externally to maximize

efﬁciency. A second LDO is switched in place of the

switching regulator for low current operation to further

improve efﬁciency and reduce noise.

The SC190’s ﬂexible clocking scheme allows it to be

synchronized to an external oscillator or controlled by the

internal oscillator. The 1MHz switching frequency allows

the use of small inductors and capacitors.

The internal MOSFET switches provide peak current

greater than 500mA to achieve a DC output of at least

300mA. Shutdown current is typically 0.1µA.

The SC190 has four different variants with four voltage

settings each. It is designed for single-cell Li-ion battery

applications, but also performs well in ﬁxed 3.3V and 5V

applications.

 Less than 1mV Supply Ripple

 Output Voltage Regulated by Either the Switching

Regulator or Linear Regulator

 Dynamic Handover Between Linear and Switching

Regulator for Maximum Efﬁciency

 2.7V to 5.5V Input Range

 300mA Guaranteed Output Current

 Fixed Frequency 1MHz Operation or 750kHz to

1.5MHz Clocked Operation

 No Schottky Diode Required

 Up to 95% Efﬁciency (VIN=BP)

 Over-current Protection

 Over-voltage Protection

 Over-temperature Protection

 Soft Start

 MLP-10, 3 x 3mm Lead-frame, Lead-free Package

 Low Output Noise < 100µVrms

 Cell Phones

 Cordless Phones

 Notebook and Subnotebook Computers

 PDAs and Mobile Communicators

 WLAN Peripherals

 1 Li-Ion or 3 NiMH/NiCd Powered Devices

SC190

4.7µF

4.7µH

VIN

VOUT

VIN

EN

SYNC/PWM

VID0

VID1

MODE

LX

VOUT

BP

GND

CIN

CBP

COUT

LOUT

4.7µF

Description

June 30, 2005

Applications

Features

Typical Application Circuit

Features

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