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參數(shù)資料
| 型號： | LT1308IS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Single Cell High Current Micropower 600kHz Boost DC/DC Converter |
| 中文描述： | SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 266K |
| 代理商： | LT1308IS8 |
4
LT1308
ELECTRICAL C
Industrial Grade –40
°
C to 85
°
C. V
IN
= 1.2V, V
SHDN
= V
IN
, T
A
= 25
°
C, unless otherwise noted.
HARA TERISTICS
SYMBOL
PARAMETER
Shutdown Pin Current
CONDITIONS
V
SHDN
= 1.2V
V
SHDN
= 6V
V
SHDN
= 0V
MIN
TYP
2.5
13
–1.5
200
0.1
0.01
5
3000
MAX
4.0
26
–2.5
220
0.25
0.1
30
UNITS
G
G
G
μ
A
μ
A
μ
A
mV
LBI Threshold Voltage
LBO Output Low
LBO Leakage Current
LBI Input Bias Current (Note 4)
Low-Battery Detector Gain
G
180
I
SINK
= 10
μ
A
V
LBI
= 250mV, V
LBO
= 5V
V
LBI
= 150mV
1M
Load (–40
°
C)
1M
Load (85
°
C)
V
SW
= 5V
G
V
G
μ
A
nA
V/V
V/V
μ
A
G
1000
300
Switch Leakage Current
G
0.01
10
Note 3:
Switch current limit guaranteed by design and/or correlation to
static tests. Duty cycle affects current limit due to ramp generator (see
Block Diagram).
Note 4:
Bias current flows out of LBI pin.
Note 5:
The LT1308 will withstand continuous application of 1.6V applied
to GND pin while V
IN
and SW are grounded.
The
G
denotes specifications which apply over the full operating
temperature range.
Note 1:
C grade device specifications are guaranteed over the 0
°
C to 70
°
C
temperature range. In addition, C grade device specifications are assured
over the –40
°
C to 85
°
C temperature range by design or correlation, but
are not production tested.
Note 2:
Bias current flows into FB pin.
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
SWITCH CURRENT (A)
0
S
C
2.0
85
°
C
1308 G03
0.5
1.0
1.5
500
400
300
200
100
0
25
°
C
–40
°
C
LOAD CURRENT (mA)
90
85
80
75
70
65
60
55
50
1
100
1000
1308 G01
10
E
V
IN
= 1.2V
V
OUT
= 3.3V
R1
= 169k
V
200mV/DIV
AC COUPLED
100mA
5mA
I
LOAD
V
IN
=
1.2V
V
OUT
= 5V
C2
= 22
μ
F
R
, C
C
= 47k, 6.8nF
L = 4.7
μ
H
500
μ
s/DIV
1308 G02
Transient Response
Switch Saturation Voltage vs
Current
Efficiency
V
C
(Pin 1):
Compensation Pin for Error Amplifier. Con-
nect a series RC from this pin to ground. Typical values
are 47k
and 22nF. Minimize trace area at V
C
.
FB (Pin 2):
Feedback Pin. Reference voltage is 1.22V.
Connect resistive divider tap here. Minimize trace area at
FB. Set V
OUT
according to: V
OUT
= 1.22V(1 + R1/R2).
SHDN (Pin 3):
Shutdown. Ground this pin to turn off
switcher. Must be tied to V
IN
(or higher voltage) to enable
switcher. Do not float the SHDN pin.
GND (Pin 4):
Ground. Connect directly to local ground
plane. Ground plane should enclose all components
associated with the LT1308.
PI
FU
CTIO
N
S
U
U
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