LTC1556 - SIM Power Supplyand Level Translator

LTC1556 - SIM Power Supplyand Level Translator - Linear Technology（凌力尔特）

The LTC1555/LTC1556 provide power conversion and level shifting needed for 3V GSM cellular telephones to interface with either 3V or 5V Subscriber Identity Modules (SIMs). These parts contain a charge pump DC/DC converter that delivers a regulated 5V to the SIM card. Input voltage may range from 2.7V to 10V, allowing direct connection to the battery. Output voltage may be programmed to 3V, 5V or direct connection to the VIN pin.

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.

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

SIM Interface in GSM Cellular Telephones

Smart Card Readers

器件型号	封装	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量)
LTC1556CGN	SSOP-20	C	$4.15	$3.35
LTC1556CGN#PBF	SSOP-20	C	$4.15	$3.35
LTC1556CGN#TR	SSOP-20	C		$3.45
LTC1556CGN#TRPBF	SSOP-20	C		$3.45
LTC1556IGN	SSOP-20	I	$5.15	$4.05
LTC1556IGN#PBF	SSOP-20	I	$5.15	$4.05
LTC1556IGN#TR	SSOP-20	I		$4.15
LTC1556IGN#TRPBF	SSOP-20	I		$4.15

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