LTC1754-3.3

Features:

Ultralow Power: I_IN  = 13 Am
Regulated Output Voltage: 3.3V 4%, 5V 4%
5V Output Current: 50mA (V_IN  3.0V)
3.3V Output Current: 40mA (V_IN   2.5V)
No Inductors Needed
Very Low Shutdown Current: <1m A
Shutdown Disconnects Load from V_IN
Internal Oscillator: 600kHz
Short-Circuit and Overtemperature Protected
Ultrasmall Application Circuit: (0.052 Inch² )
6-Pin SOT-23 Package


Application

SIM Interface Supplies for GSM Cellular Telephones
White LED Power Supplies
Li-Ion Battery Backup Supplies
Handheld Computers
Smart Card Readers
PCMCIA Local 5V Supplies


Pinout




Specifications

V_IN  to GND ..................................................  0.3V to 6V
V_OUT to GND  ...............................................  0.3V to 6V
SHDN to GND  ..............................................  0.3V to 6V
I_OUT  (Note 4) ......................................................... 75mA
V_OUT  Short-Circuit Duration ............................  Indefinite
Operating Temperature Range (Note 3) ... 40 C to 85 C
Storage Temperature Range   ..................65 C to 150 C
Lead Temperature (Soldering, 10 sec)   ...................300 C


Description

The LTC^_(R) 1754 is a micropower charge pump DC/DC converter that produces a regulated output. The input voltage range is 2V to 4.4V for 3.3V output and 2.7V to 5.5V for 5V output. Extremely low operating current and a low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make the LTC1754 ideally suited for small, battery-powered applications. The total component area of the application circuit shown below is only 0.052 inch² .

The LTC1754 operates as a Burst Mode^TM switched capaci-tor voltage doubler to produce a regulated output.  It has thermal shutdown capability and can survive a continuous short circuit from V_OUT to GND.

The LTC1754 is available in a 6-pin SOT-23 package.