LT1111CS85PBF LINEAR TECH, LT1111CS85PBF Datasheet
LT1111CS85PBF
Manufacturer Part Number
LT1111CS85PBF
Description
Manufacturer
LINEAR TECH
Datasheet
1.LT1111CS85PBF.pdf
(16 pages)
3V INPUT
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Operates at Supply Voltages from 2V to 30V
Works with Surface Mount Inductors
72kHz Oscillator
Only Three External Components Required
Step-Up or Step-Down Mode
Low-Battery Detector Comparator On-Chip
User Adjustable Current Limit
Internal 1A Power Switch
Fixed or Adjustable Output Voltage Versions
Space Saving 8-Pin MiniDIP or SO-8 Package
3V to 5V, 5V to 12V Converters
9V to 5V, 12V to 5V Converters
Remote Controls
Peripherals and Add-On Cards
Battery Backup Supplies
Uninterruptible Supplies
Laptop and Palmtop Computers
Cellular Telephones
Portable Instruments
Flash Memory VPP Generators
+
*OPTIONAL
All Surface Mount 3V to 5V Step-Up Converter
10 F*
I
GND
LT1111CS8-5
LIM
U
V
SW2
SENSE
IN
SW1
CD54-220M
SUMIDA
22 H
U
MBRS120T3
+
LT1111 • TA01
33 F
5V
100mA
Adjustable and Fixed 5V, 12V
The LT
The device requires only three external components to
deliver a fixed output of 5V or 12V. Supply voltage ranges
from 2V to 12V in step-up mode and to 30V in step-down
mode. The LT1111 functions equally well in step-up, step-
down, or inverting applications.
The LT1111 oscillator is set at 72kHz, optimizing the
device to work with off-the-shelf surface mount inductors.
The device can deliver 5V at 100mA from a 3V input in
step-up mode or 5V at 200mA from a 12V input in step-
down mode.
Switch current limit can be programmed with a single
resistor. An auxiliary open-collector gain block can be
configured as a low-battery detector, linear post regulator,
undervoltage lock-out circuit, or error amplifier.
For input sources of less than 2V use the LT1110.
DESCRIPTIO
, LTC and LT are registered trademarks of Linear Technology Corporation
®
1111 is a versatile micropower DC/DC converter.
6
5
4
3
2
1
0
0
25
Typical Load Regulation
DC/DC Converter
V
IN
U
50
= 2V 2.2 2.4
LOAD CURRENT (mA)
75
100
Micropower
125
2.6
150
LT1111 • TA02
2.8 3V
175
200
LT11 11
1111fd
1
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