LT1173CN8PBF

Manufacturer Part NumberLT1173CN8PBF
ManufacturerLINEAR TECH
LT1173CN8PBF datasheets
 


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FEATURE
S
Operates at Supply Voltages From 2.0V to 30V
Consumes Only 110 A Supply Current
Works in Step-Up or Step-Down Mode
Only Three External Components Required
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 SO8 Package
O
U
A
PPLICATI
S
Flash Memory Vpp Generators
3V to 5V, 5V to 12V Converters
9V to 5V, 12V to 5V Converters
LCD Bias Generators
Peripherals and Add-On Cards
Battery Backup Supplies
Laptop and Palmtop Computers
Cellular Telephones
Portable Instruments
U
O
TYPICAL
A
PPLICATI
Logic Controlled Flash Memory VPP Generator
L1*
1N5818
100 H
5V
IN
47
I
V
LIM
IN
SW1
+
LT1173
10 F
FB
GND
SW2
1N4148
PROGRAM
*L1 = GOWANDA GA20-103K
EFFICIENCY = 81%
COILTRONICS CTX100-4
= 1% METAL FILM
NO OVERSHOOT
Adjustable and Fixed 5V, 12V
D
ESCRIPTIO
The LT1173 is a versatile micropower DC-DC converter.
The device requires only three external components to
deliver a fixed output of 5V or 12V. Supply voltage ranges
from 2.0V to 12V in step-up mode and to 30V in step-down
mode. The LT1173 functions equally well in step-up, step-
down or inverting applications.
The LT1173 consumes just 110 A supply current at
standby, making it ideal for applications where low quies-
cent current is important. The device can deliver 5V at
80mA 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 gain block can be configured as a low
battery detector, linear post regulator, under voltage lock-
out circuit or error amplifier.
For input sources of less than 2V, use the LT1073.
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
S
12V
100mA
V
OUT
5V/DIV
1.07M
+
SANYO
OS-CON
100 F
PROGRAM
5V/DIV
124k
LT1173 • TA01
Micropower
DC/DC Converter
U
VPP Output
0V
5ms/DIV
1173 TA02
LT1173
1