LTC1555 - SIM Power Supplyand Level Translator _ BDTIC a Leading Distributor in China

LTC1555 - SIM Power Supplyand Level Translator

A soft start feature limits inrush current at turn-on, mitigating start-up problems that may result when the input is supplied by another low power DC/DC converter. The LTC1556 also includes an auxiliary LDO regulator/power switch that may be used to power the frequency synthesizer or other low power circuitry.

Battery life is maximized by 60µA operating current and 1µA shutdown current. Board area is minimized by miniature 16- and 20-pin narrow SSOP packages and the need for only three small external capacitors.

Features

Step-Up/Step-Down Charge Pump Generates 5V
Input Voltage Range: 2.7V to 10V
Output Current: 10mA (VIN >/= 2.7V) 20mA (VIN >/=3V)
3V to 5V Signal Level Translators
>10kV ESD on All SIM Contact Pins
Short-Circuit and Overtemperature Protected
Very Low Operating Current: 60µA
Very Low Shutdown Current: <1µA
Soft Start Limits Inrush Current at Turn-On
Programmable 3V or 5V Output Voltage
650kHz Switching Frequency
Auxiliary 4.3V LDO/Power Switch (LTC1556 Only)
Available in a 16- and 20-Pin Narrow SSOP

Typical Application

Applications

SIM Interface in GSM Cellular Telephones
Smart Card Readers

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC1555CGN#PBF	SSOP-16	C	$3.60	$2.85
LTC1555CGN#TRPBF	SSOP-16	C		$2.91
LTC1555IGN#PBF	SSOP-16	I	$4.30	$3.45
LTC1555IGN#TRPBF	SSOP-16	I		$3.51