LTC1555L-1.8 SIM Power Supplyand Level Translator

The LTC®1555L-1.8 provides power conversion and level shifting needed for low voltage GSM and WCDMA cellular telephones to interface with either 1.8V, 3V or 5V subscriber identity modules (SIMs). The part contains a patented buck/boost charge pump DC/DC converter* that delivers a regulated VCC supply voltage to the SIM card. Input voltage may range from 2.6V to 6V allowing direct connection to the battery. The output voltage may be programmed to 1.8V, 3V, 5V or direct connection to the VIN pin.

Internal level translators allow controllers operating with supplies as low as 1.425V to interface with 1.8V, 3V and 5V SIMs. 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. Battery life is maximized by 32µA operating current, and 1µA shutdown current. Board area is minimized by the miniature 16-pin narrow SSOP packages and the need for only three small external capacitors

产品特点 Features

Buck/Boost Charge Pump Generates 1.8V, 3V or 5V
Input Voltage Range: 2.6V to 6V
Controller VCC Range: 1.425V to 4.4V
>10kV ESD on All SIM Contact Pins
Short-Circuit and Overtemperature Protected
Meets all ETSI and IMT-2000 SIM Interface Requirements
1.8V to 5V Signal Level Translators
Very Low Operating Current: 32µA
Very Low Shutdown Current: <1µA
Soft-Start Limits Inrush Current at Turn-On
1MHz Switching Frequency
Available in 16-Pin Narrow SSOP Package

应用

SIM Interface in GSM Cellular Telephones
WCDMA SIM Interface
Smart Card Readers

典型应用图

参数

LTC1555L-1.8 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

LTC1555L-1.8 数据手册及相关资料下载

数据手册(英文) : LTC1555L-1.8 - 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