Datasheet > 555L18

555L18

更新时间： 2024-11-10 07:57:11

品牌	Logo	应用领域
凌特 - Linear		转换器电平转换器
页数	文件大小	规格书
8页	146K
描述
SIM Power Supply and Level Translator

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中文翻译

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数据手册

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555L18 数据手册

LTC1555L-1.8

SIM Power Supply and

Level Translator

FEATURES

DESCRIPTIO

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 sub-

scriber identity modules (SIMs). The part contains a

patented buck/boost charge pump DC/DC converter* that

delivers a regulated V_CCsupply 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

V_INpin.

■

Buck/Boost Charge Pump Generates 1.8V, 3V or 5V

■

Input Voltage Range: 2.6V to 6V

■

Controller V_CCRange: 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

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.

■

1MHz Switching Frequency

■

Available in 16-Pin Narrow SSOP Package

APPLICATIO S

■

SIM Interface in GSM Cellular Telephones

WCDMA SIM Interface

Smart Card Readers

■

, LTC and LT are registered trademarks of Linear Technology Corporation.

*U.S. Patent No.: 5,973,944

TYPICAL APPLICATIO

GSM Cellular Telephone SIM Interface

GSM

CONTROLLER

2.6V TO 6V

1.425V TO 4.4V

LTC1555L-1.8

SIM

CIN

CLK

RST

I/O

CLK

RST

I/O

RIN

DATA

DDRV

VCC

= 1.8V,3V,5V

= 10mA

2.2µF

0.1µF

–

1µF

GND

1555L TA01

12 3 4 5 6 7 8

中文翻译

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