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