LTC1555 SIM Power Supplyand Level Translator

The LTC®1555/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

产品特点 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

应用

SIM Interface in GSM Cellular Telephones
Smart Card Readers

典型应用图

参数

LTC1555 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC1555CGN	SSOP	16	C	$3.60	$2.85
LTC1555CGN#PBF	SSOP	16	C	$3.60	$2.85
LTC1555CGN#TR	SSOP	16	C		$2.91
LTC1555CGN#TRPBF	SSOP	16	C		$2.91
LTC1555IGN	SSOP	16	I	$4.30	$3.45
LTC1555IGN#PBF	SSOP	16	I	$4.30	$3.45
LTC1555IGN#TR	SSOP	16	I		$3.51
LTC1555IGN#TRPBF	SSOP	16	I		$3.51
LTC1555LEGN	SSOP	16	E	$2.37	$2.00
LTC1555LEGN#PBF	SSOP	16	E	$2.37	$2.00
LTC1555LEGN#TR	SSOP	16	E		$2.06
LTC1555LEGN#TRPBF	SSOP	16	E		$2.06
LTC1555LEGN-1.8	SSOP	16	E	$2.60	$2.20
LTC1555LEGN-1.8#PBF	SSOP	16	E	$2.60	$2.20
LTC1555LEGN-1.8#TR	SSOP	16	E		$2.26
LTC1555LEGN-1.8#TRPBF	SSOP	16	E		$2.26

LTC1555 数据手册及相关资料下载

数据手册(英文) : LTC1555/LTC1556 - SIM Power Supply and Level Translator.PDF
应用指南 (英文) : AN84 - linear Technology Magazine Circuit Collection, Volume IV .PDF
设计要点 (英文) : DN142 - Ultralow Quiescent Current DC/DC Converters for Light Load Applications.PDF
可靠性数据 : R369 Reliability Data .PDF