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LT1108CN8 Datasheet

  • LT1108CN8

  • Micropower DC/DC Converter Adjustable and Fixed 5V, 12V

  • 12頁

  • LINER

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LT1108
Micropower
DC/DC Converter
Adjustable and Fixed 5V, 12V
FEATURES
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DESCRIPTIO
Operates at Supply Voltages from 2V to 30V
Consumes Only 110碌A(chǔ) Supply Current
Works in Step-Up or Step-Down Mode
Only Four 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 S8 Package
The LT1108 is a versatile micropower DC/DC converter.
The device requires only four 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 LT1108 functions equally well in step-up, step-
down, or inverting applications.
The LT1108 is pin-for-pin compatible with the LT1173, but
has a duty cycle of 70%, resulting in increased output
current in many applications. The LT1108 can deliver
150mA at 5V from a 2 AA cell input and 5V at 300mA from
9V in step-down mode. Quiescent current is just 110碌A(chǔ),
making the LT1108 ideal for power conscious battery-
operated systems.
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.
APPLICATI
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Palmtop Computers
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
Cellular Telephones
Portable Instruments
TYPICAL APPLICATI
Palmtop Computer Logic Supply
L1*
100碌H
47鈩?/div>
I
LIM
2
脳
AA
CELLS
V
IN
SW1
EFFICIENCY (%)
84
1N5817
5V
150mA
82
80
78
76
74
72
70
V
IN
= 3V
V
IN
= 2.5V
V
IN
= 2V
+
100碌F
+
LT1108-5
SENSE
GND
SW2
AVX
TPS
330碌F
6.3V
*L1 = GOWANDA GA20-103K
COILTRONICS CTX100-4
SUMIDA CD105-101K
LT1108 鈥?TA01
U
Efficiency
1
10
100
LOAD CURRENT (mA)
LT1108 鈥?TA02
UO
UO
1

LT1108CN8 產(chǎn)品屬性

  • LT1108

  • 50

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器

  • -

  • 降壓（降壓），升壓（升壓），反相

  • 可調(diào)式

  • 1

  • 可調(diào)

  • 2 V ~ 30 V

  • -

  • 19kHz

  • 400mA

  • 無

  • 0°C ~ 70°C

  • 通孔

  • 8-DIP（0.300"，7.62mm）

  • 管件

  • 8-PDIP

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