參數(shù)資料
型號: LT1614IMS8
英文描述: Analog IC
中文描述: 模擬IC
文件頁數(shù): 5/16頁
文件大?。?/td> 257K
代理商: LT1614IMS8
5
LT1614
NFB (Pin 1):
Negative Feedback Pin. Reference voltage is
–1.24V. Connect resistive divider tap here. The sug-
gested value for R2 is 24.9k. Set R1 and R2 according to:
R
V
R
OUT
+
1
1 24
.
2
4 5 10
6
.
=
|
|–1 24
V
C
(Pin 2):
Compensation Pin for Error Amplifier. Con-
nect a series RC from this pin to ground. Typical values
are 100k
and 1nF. Minimize trace area at V
C
.
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.
PI
FU
CTIO
N
S
U
U
GND (Pin 4):
Ground. Connect directly to local ground
plane.
SW (Pin 5):
Switch Pin. Minimize trace area at this pin to
keep EMI down.
V
IN
(Pin 6):
Supply Pin. Must have 1
μ
F ceramic bypass
capacitor right at the pin, connected directly to ground.
LBI (Pin 7):
Low-Battery Detector Input. 200mV refer-
ence. Voltage on LBI must stay between ground and
700mV. Float this pin if not used.
LBO (Pin 8):
Low-Battery Detector Output. Open collec-
tor, can sink 10
μ
A. A 1M
pull-up is recommended. Float
this pin if not used. The low-battery detector is disabled
when SHDN is low. LBO is high-Z in this state.
BLOCK DIAGRA
M
W
+
+
+
+
+
+
+
Σ
COMPARATOR
RAMP
GENERATOR
R
BIAS
V
C
2
g
m
Q2
×
10
R3
30k
Q1
NFB
NFB
ENABLE
200mV
A = 3
FF
A2
ERROR
AMPLIFIER
A1
A4
0.15
DRIVER
SW
5
GND
1614 BD
Q3
Q
S
600kHz
OSCILLATOR
LBO
8
LBI
7
SHDN
3
SHUTDOWN
4
R6
40k
R5
40k
R1
(EXTERNAL)
R4
140k
1
V
IN
6
V
IN
V
OUT
R2
(EXTERNAL)
Figure 2. Block Diagram
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