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LT1107 Datasheet(PDF) 1 Page - Linear Technology

Part No. LT1107
Description  Micropower DC/DC Converter Adjustable and Fixed 5V, 12V
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1107 Datasheet(HTML) 1 Page - Linear Technology

 
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1
LT1107
Micropower
DC/DC Converter
Adjustable and Fixed 5V, 12V
APPLICATI
TYPICAL
Efficiency
DESCRIPTIO
S
FEATURE
s
Operates at Supply Voltages from 2V to 30V
s
Consumes Only 320
µA Supply Current
s
Works in Step-Up or Step-Down Mode
s
Only Three External Components Required
s
Low-Battery Detector Comparator On-Chip
s
User Adjustable Current Limit
s
Internal 1A Power Switch
s
Fixed or Adjustable Output Voltage Versions
s
Space Saving 8-Pin MiniDIP or SO-8 Package
The LT1107 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 2V to 12V in step-up mode and to 30V in step-down
mode. The LT1107 functions equally well in step-up, step-
down, or inverting applications.
The LT1107 is pin-for-pin compatible with the LT1111, but
has a duty cycle of 70%, resulting in increased output
current in many applications. The LT1107 can deliver
150mA at 5V from a 2AA cell input and 5V at 300mA from
24V in step-down mode. Quiescent current is just 320
µA,
making the LT1107 ideal for power-conscious battery-
operated systems. The 63kHz oscillator is optimized to
work with surface mount inductors and capacitors.
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, undervoltage
lock-out circuit, or error amplifier.
S
APPLICATI
s
Palmtop Computers
s
3V to 5V, 5V to 12V Converters
s
24V to 5V, 12V to 5V Converters
s
LCD Bias Generators
s
Peripherals and Add-On Cards
s
Battery Backup Supplies
s
Cellular Telephones
s
Portable Instruments
LOAD CURRENT (mA)
1
82
80
78
76
74
72
70
68
66
64
10
100
400
1107 TA02
VIN = 3V
VIN = 2.5V
VIN = 2V
+
5V
150mA
+
MBRS120T3
L1*
33
µH
47
2
× AA
ALKALINE CELLS
100
µF
SUMIDA CD54-330K
COILCRAFT DT3316-473
*
ILIM
VIN
SENSE
SW1
SW2
GND
47
µF
LT1107-5
1107 TA01
Palmtop Computer Logic Supply


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