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參數(shù)資料
| 型號： | LIT1108CS8-5#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 25 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 266K |
| 代理商： | LIT1108CS8-5#PBF |
1
LT1108
Micropower
DC/DC Converter
Adjustable and Fixed 5V, 12V
D
U
ESCRIPTIO
S
FEATURE
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
A,
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.
s
Operates at Supply Voltages from 2V to 30V
s
Consumes Only 110
A Supply Current
s
Works in Step-Up or Step-Down Mode
s
Only Four 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 S8 Package
U
S
A
O
PPLICATI
s
Palmtop Computers
s
3V to 5V, 5V to 12V Converters
s
9V 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
U
A
O
PPLICATI
TYPICAL
LOAD CURRENT (mA)
1
78
EFFICIENCY
(%)
80
82
84
10
100
LT1108 TA02
76
74
72
70
VIN = 3V
VIN = 2.5V
VIN = 2V
AVX
TPS
330
F
6.3V
L1*
100
H
LT1108 TA01
1N5817
5V
150mA
GND
SW2
SW1
ILIM
VIN
LT1108-5
SENSE
100
F
+
*L1 =
+
2
× AA
CELLS
GOWANDA GA20-103K
COILTRONICS CTX100-4
SUMIDA CD105-101K
47
Efficiency
Palmtop Computer Logic Supply
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參數(shù)描述 |
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