LTC1142HV 查看數據表（PDF） - Linear Technology
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LTC1142HV Datasheet PDF : 20 Pages
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LTC1142/LTC1142L/LTC1142HV
TYPICAL PERFOR A CE CHARACTERISTICS
DC Supply Current
2.1
1.8
1.5
ACTIVE MODE
1.2
PER REGULATOR BLOCK
NOT INCLUDING
0.9 GATE CHARGE CURRENT
PINS 10, 24
0.6
0.3
SLEEP MODE
0
0 2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
1142 G07
Supply Current in Shutdown
20
18
PER REGULATOR BLOCK
PINS 10, 24
16 VSHUTDOWN = 2V
14
12
10
8
6
4
2
0
0 2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
1142 G08
Operating Frequency vs
VIN – VOUT
1.6
VOUT = 5V
1.4
0°C
1.2
1.0
70°C
0.8
25°C
0.6
0.4
0.2
0
0
2
4
6
8 10 12
VIN – VOUT VOLTAGE (V)
1142 G09
Gate Charge Supply Current
28
24
20
QN + QP = 100nC
16
12
8
QN + QP = 50nC
4
0
20
80
140
200
260
OPERATING FREQUENCY (kHz)
1142 G10
Off-Time vs Output Voltage
80
VSENSE = VOUT
70
60
50
40
30
20
10
VOUT = 5V
VOUT = 3.3V
0
0
1
2
3
4
5
OUTPUT VOLTAGE (V)
1142 G11
Current Sense Threshold Voltage
175
MAXIMUM
150
THRESHOLD
125
100
75
50
MINIMUM
25
THRESHOLD
0
0
20
40
60
80 100
TEMPERATURE (°C)
1142 G12
PI FU CTIO S
LTC1142/LTC1142HV
SENSE+3 (Pin 1): The (+) Input to the 3.3V Section
Current Comparator. A built-in offset between Pins 1 and
28 in conjunction with RSENSE3 sets the current trip
threshold for the 3.3V section.
SHDN3 (Pin 2): When grounded, the 3.3V section oper-
ates normally. Pulling Pin 2 high holds both MOSFETs off
and puts the 3.3V section in micropower shutdown mode.
Requires CMOS logic-level signal with tr, tf < 1µs. Do not
“float” Pin 2.
SGND3 (Pin 3): The 3.3V section small-signal ground
must be routed separately from other grounds to the (–)
terminal of the 3.3V section output capacitor.
PGND3 (Pin 4): The 3.3V section driver power ground
connects to source of N-channel MOSFET and the (–)
terminal of the 3.3V section input capacitor.
NC (Pin 5): No Connection.
NDRIVE 3 (Pin 6): High Current Drive for Bottom N-Channel
MOSFET, 3.3V Section. Voltage swing at Pin 6 is from
ground to VIN3.
5
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