參數(shù)資料
型號(hào)： LTC1473L
廠商： Linear Technology Corporation
英文描述： Dual General Purpose LinCMOS(TM) Differential Comparator 8-SOIC -40 to 125
中文描述： 雙低電壓PowerPathTM開關(guān)驅(qū)動(dòng)器
文件頁(yè)數(shù)： 5/16頁(yè)
文件大?。?/td> 211K
代理商： LTC1473L
LTC 1473L
5
PI FU CTIO S
SW (Pin 7):
Open Drain of an Internal N-Channel MOSFET
Switch. This pin drives the bottom of the V
GG
switching
regulator inductor which is connected between this pin and
the V
+
pin.
GND (Pin 8):
Ground.
GB2, GA2 (Pins 9, 11):
Switch Gate Drivers. GA2 and GB2
drive the gates of the second back-to-back external
N-channel switches.
SAB2 (Pin 10):
Source Return. The SAB2 pin is connected
to the sources of SW A2 and SW B2. A small pull-down
current source returns this node to 0V when the switches
are turned off.
SENSE
–
(Pin 12):
Inrush Current Input. This pin should be
connected directly to the bottom (output side) of the low
valued resistor in series with the two input power selector
switch pairs, SW A1/B1 and SW A2/B2, for detecting and
controlling the inrush current into and out of the power
supply sources and the output capacitor.
SENSE
+
(Pin 13):
Inrush Current Input. This pin should be
connected directly to the top (switch side) of the low
valued resistor in series with the two input power selector
switch pairs, SW A1/B1 and SW A2/B2, for detecting and
controlling the inrush current into and out of the power
supply sources and the output capacitor. Current limit is
invoked when (V
SENSE+
– V
SENSE–
) exceeds
±
0.2V.
IN1 (Pin 1):
Logic Input of Gate Drivers GA1 and GB1. IN1
is disabled when IN2 is high or DIODE is low. During
2-diode mode, asserting IN1 disables the fault timer
function.
IN2 (Pin 2):
Logic Input of Gate Drivers GA2 and GB2. IN2
is disabled when IN1 is high or DIODE is low. During
2-diode mode, asserting IN2 disables the fault timer
function.
DIODE (Pin 3):
“2-Diode Mode” Logic Input. Diode over-
rides IN1 and IN2 by forcing the two back-to-back
external N-channel MOSFET switches to mimic two di-
odes.
TIMER (Pin 4):
Fault Timer. A capacitor connected from
this pin to GND programs the time the MOSFET switches
are allowed to be in current limit. To disable this function,
Pin 4 can be grounded.
V
+
(Pin 5):
Power Supply. Bypass this pin with at least a
1
μ
F capacitor.
V
GG
(Pin 6):
Gate Driver Supply. This high voltage supply
is intended only for driving the internal micropower gate
drive circuitry. Do not load this pin with any external
circuitry Bypass this pin with at least 1
μ
F.
Pin Function Table
NOMINAL (V)
TYP
1
1
1
1.16
ABSOLUTE MAX (V)
MIN
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
0
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
–0.3
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
IN1
IN2
DIODE
TIMER
V
+
V
GG
SW
GND
GB2
SAB2
GA2
SENSE
–
SENSE
+
GB1
SAB1
GA1
DESCRIPTION
Logic Input of Gate Drivers GA1 and GB1
Logic Input of Gate Drivers GA2 and GB2
“2-Diode Mode” Logic Input
Fault Timer Programs Time in Current Limit
Power Supply
Gate Driver Supply
Switch Node of Internal Boost Switching Regulator
Ground
Switch Gate Driver for Switch B2
Source Return of Switch 2
Switch Gate Driver for Switch A2
Inrush Current Input, Low Side
Inrush Current Input, High Side
Switch Gate Driver for Switch B1
Source Return of Switch 1
Switch Gate Driver for Switch A1
MIN
0.4
0.4
0.4
MAX
2
2
2
MAX
7
7
7
5
10
20
20
0
20
10
20
10
10
20
10
20
2.8
10.2
0
9
20
20
0
0
0
0
0
0
0
0
0
17
10
17
10
10
17
10
17
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