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LTC1985ES6-1.8, LTC1986, LTC19860CUHF

Table of contents:
Info of LTC1985ES6-1.8
Info of LTC1986
Info of LTC19860CUHF

LTC1985ES6-1.8, LTC1986, LTC19860CUHF Selling Leads, Datasheet

MFG:LTNM Package Cooled:SOT D/C:05

LTC1985ES6-1.8, LTC1986, LTC19860CUHF Picture

LTC1985ES6-1.8, LTC1986, LTC19860CUHF Datasheet download

Five Points

Part Number: LTC1985ES6-1.8

MFG: LTNM

Package Cooled: SOT

D/C: 05

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LTC1986 General Description

The LTC^(R) 1986 is a micropower charge pump DC/DC converter that provides power for either 3V or 5V GSM IM cards. It operates in one of three modes: V _OUT = 5V (5V mode), V_OUT = V_IN(3V mode) or shutdown. The input voltage range is 2.6V to 4.4V and the part can provide 10mA of output current. The LTC1986 allows VIN to drop as low as 2.6V by providing a boost feature in 3V mode. In 3V mode, V_OUT is connected directly to V _INthrough a 2.5W switch until V_IN drops below 2.85V. When V_IN is below 2.85V, the part automatically boosts V_OUTto maintain a regulated 2.9V output, thereby ensuring V_OUT stays within the 3V SIM V_CC specification.

Extremely low operating current (14m A typical with no load) and low external parts count make the part ideally suited for small, light load battery-powered applications. The total PCB area of the application circuit shown below is less than 0.045in². Protection features include inrush current limiting, undervoltage lockout, short circuit and thermal overload protection. The LTC1986 is available in a 6-lead SOT-23 package.

LTC1986 Maximum Ratings

V _IN, V _OUT to GND.........................................0.3V to 6V
All Other Pins to GND......................................0.3V to 6V
VOUT Short-Circuit Duration................................Indefinite
Operating Temperature Range
(Note 2) ..................................................... 40 C to 85 C
Storage Temperature Range.................... 65 C to 150 C
Lead Temperature (Soldering, 10 sec)......................300 C

LTC1986 Features

V _IN Range: 2.6V to 4.4V
Step-Up Charge Pump Generates 5V
Output Current: 10mA
V_IN to V _OUT Direct Connection for 3V SIMs
Ultralow Power
Operating Current: 14m A
Shutdown Current: <1m A
No Inductors
Short-Circuit/Thermal Protected
Switching Frequency: 900kHz
Soft-Start Limits Inrush Current at Turn-On
Output Driven to Ground During Shutdown
Ultrasmall Application Circuit (<0.045in²)
6-Lead SOT-23 Package

LTC1986 Typical Application

GSM Cellular Telephones
PCS/DCS Cellular Telephones
Portable POS Terminals

LTC1986 Connection Diagram

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