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參數(shù)資料
| 型號： | LT1109 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V, 12V |
| 中文描述： | 微低成本DC / DC轉(zhuǎn)換器可調(diào)節(jié)和固定5V，12V的 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 212K |
| 代理商： | LT1109 |
LT1109
4
W
IAGRA
BLOCK
S
LT1109-5, -12 Z Package
The LT1109Z-5 and LT1109Z-12 are fixed output voltage
step-up DC/DC converters in a 3-pin TO-92 package.
Power for internal regulator circuitry is taken from the
V
OUT
pin, a technique known as “bootstrapping.” Circuit
operation can be best understood by referring to the block
diagram. V
OUT
, attenuated by R1 and R2, is applied to the
negative input of comparator A1. When this voltage falls
below the 1.25V reference voltage, the oscillator is turned
on and the power switch Q1 cycles at the oscillator
frequency of 120kHz. Switch cycling alternately builds
current in the inductor, then dumps it into the output
capacitor, increasing the output voltage. When A1’s nega-
tive input rises above 1.25V, it turns off the oscillator. A
small amount of hysteresis in A1 obviates the need for
frequency compensation circuitry. When Q1 is off, current
into the V
OUT
pin drops to just 320
μ
A. Quiescent current
from the battery will be higher because the device oper-
ates off the stepped-upvoltage.
LT1109-5, -12 N8, S8 Package
C
HARA TERISTICS
U
A
TYPICAL PERFOR
CE
LT1109Z
U
ATIO
OPER
Minimum/Maximum
Oscillator Frequency vs t
ON
Quiescent Current
Quiescent Current
INPUT VOLTAGE (V)
0
200
Q
μ
A
300
450
20
LT1109 TPC09
2
10
400
18
250
4
8
12 14
350
T
A
= 25°C
6
16
TEMPERATURE (°C)
–50
200
Q
μ
A
280
400
100
LT1109 TPC10
25
360
75
220
–25
0
50
320
240
260
300
340
380
IN
V
LT1109 TA04
GND
1.25V
REFERENCE
A1
DRIVER
SW
120kHz
OSCILLATOR
COMPARATOR
R2
250k
R1
+
–
SENSE
SHUTDOWN
Q1
FB
ON FIXED VERSION PIN 8 IS SENSE
ON ADJUSTABLE VERSION PIN 8 IS FB AND R1 AND R2 ARE DISCONNECTED
OUT
V
LT1109 TA03
GND
1.25V
REFERENCE
A1
DRIVER
SW
120kHz
OSCILLATOR
COMPARATOR
R2
250k
R1
+
–
Q1
LT1109-5: R1 = 83k
LT1109-12: R1 = 29k
T
ON
(
μ
s)
2.0
80
O
110
160
6.0
LT1109 TPC08
2.5
4.0
140
120
5.5
150
90
3.0
3.5
4.5
5.0
130
100
T
A
= 25
°
C
0
°
C
≤
T
A
≤
70
°
C
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1109-12 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V, 12V |
| LT1109-5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V, 12V |
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| LT1109A-12 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V, 12V |
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