參數(shù)資料
型號(hào): LTC1701
廠商: Linear Technology Corporation
元件分類: 通用總線功能
英文描述: Synchronous 8-Bit Up/Down Binary Counters 24-SOIC 0 to 70
中文描述: 1MHz的降壓型DC / DC轉(zhuǎn)換器采用SOT - 23
文件頁數(shù): 3/12頁
文件大小: 138K
代理商: LTC1701
3
LTC 1701
SW (Pin 1):
The Switch Node Connection to the Inductor.
This pin swings from V
IN
to a Schottky diode (external)
voltage drop below ground. The cathode of the Schottky
diode must be closely connected to this pin.
GND (Pin 2):
Ground Pin. Connect to the (–) terminal of
C
OUT
, the Schottky diode and (–) terminal of C
IN
.
V
FB
(Pin 3):
Receives the feedback voltage from the
external resistive divider across the output. Nominal volt-
age for this pin is 1.25V.
I
TH
/RUN (Pin 4):
Combination of Error Amplifier Compen-
sation Point and Run Control Input. The current compara-
tor threshold increases with this control voltage. Nominal
voltage range for this pin is 1.25V to 2.25V. Forcing this
pin below 0.8V causes the device to be shut down. In
shutdown all functions are disabled.
V
IN
(Pin 5):
Main Supply Pin and the (+) Input to the
Current Comparator. Must be closely decoupled to ground.
PI FU CTIO S
BLOCK DIAGRA
W
+
1.25V
BANDGAP
REFERENCE
I
/REF
CLAMP
SHDN
50
μ
A
V
REF
V
REF
1.4V
1.5V
V
(1.25V)
+
OVER
VOLTAGE
COMP
+
I
COMP
+
ERROR
AMP
(1.25V TO 2.25V)
+
CURRENT
COMP
V
REF
+
CURRENT
SENSE
AMP
SW
GND
1701 BD
V
IN
OFF-TIMER
AND GATE
CONTROL LOGIC
GATE
DRIVER
V
FB
I
TH
/RUN
PULSE
STRETCHER
V
FB
<0.6V
V
IN
V
IN
Pin Limit Table
NOMINAL (V)
TYP
ABSOLUTE MAX (V)
MIN
–0.3
PIN
1
2
3
4
5
NAME
SW
GND
V
FB
I
TH
/RUN
V
IN
DESCRIPTION
Switch Node
Ground Pin
Output Feedback Pin
Error Amplifier Compensation and RUN Pin
Main Power Supply
MIN
–0.3
MAX
V
IN
MAX
V
IN
+ 0.3
0
0
0
1.25
1.35
2.25
5.5
–0.3
–0.3
–0.3
3
3
6
2.5
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