參數(shù)資料
型號(hào): LT1316IS8
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: SPDT, 1/4 Amp Two Circuit Pushbutton
中文描述: 0.75 A SWITCHING REGULATOR, PDSO8
封裝: 0.150 INCH, PLASTIC, SOP-8
文件頁數(shù): 5/16頁
文件大小: 344K
代理商: LT1316IS8
5
LT1316
PI
FU
CTIO
N
S
U
U
LBO (Pin 1):
Low-Battery Detector Output. Open collector
can sink up to 500
μ
A. Low-battery detector remains active
in shutdown mode.
LBI (Pin 2):
Low-Battery Detector Input. When voltage at
this pin drops below 1.17V, LBO goes low.
R
SET
(Pin 3):
A resistor between R
SET
and GND programs
peak switch current. The resistor value should be between
3k and 150k. Do not float or short to ground. This is a high
impedance node. Keep traces at this pin as short as
possible. Do not put capacitance at this pin.
GND (Pin 4):
Ground. Connect directly to ground plane.
SW (Pin 5):
Collector of NPN Power Transistor. Keep
traces at this pin as short as possible.
V
IN
(Pin 6):
Input Supply. Must be bypassed close to the
pin.
SHDN (Pin 7):
Shutdown. Ground this pin to place the part
in shutdown mode (only the low-battery detector remains
active). Tie to a voltage between 1.4V and 6V to enable the
device. SHDN pin is logic level and need only meet the
logic specification (1.4V for high, 0.4V for low).
FB (Pin 8):
Feedback Pin. Reference voltage is 1.23V.
Connect resistive divider tap here. Minimize trace area at
FB. Set V
OUT
according to: V
OUT
= 1.23V(1 + R1/R2).
+
+
1.17V
A3
LBI
A2
DRIVER
LB0
1
L1
R3 = 10R4
1.5V
UNDERVOLTAGE
LOCKOUT
D1
C1
R5
R4
0.5V
Q2
×
1
R2
R1
V
OUT
V
IN
Q1
×
200
OSCILLATOR
6.3
μ
s ON
2
μ
s OFF
+
+
V
1.23V
FB
2
3
4
7
8
5
6
A4
R
SET
V
IN
SW
GND
1316 F01
SHDN
A1
Figure 1. LT1316 Block Diagram
BLOCK DIAGRA
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