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LTC1142_00 Datasheet(数据表) 5 Page - Linear Technology

部件型号  LTC1142
说明  Dual High Efficiency Synchronous Step-Down Switching Regulators
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
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LTC1142 Datasheet(HTML) 5 Page - Linear Technology

 
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5
LTC1142/LTC1142L/LTC1142HV
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.
PI FU CTIO S
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.
Operating Frequency vs
VIN – VOUT
Current Sense Threshold Voltage
Supply Current in Shutdown
Off-Time vs Output Voltage
DC Supply Current
Gate Charge Supply Current
INPUT VOLTAGE (V)
0
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
2
10
14
1142 G07
8
18
4
6
12
16
PER REGULATOR BLOCK
NOT INCLUDING
GATE CHARGE CURRENT
PINS 10, 24
ACTIVE MODE
SLEEP MODE
INPUT VOLTAGE (V)
0
20
18
16
14
12
10
8
6
4
2
0
2
10
14
1142 G08
8
18
4
6
12
16
PER REGULATOR BLOCK
PINS 10, 24
VSHUTDOWN = 2V
VIN – VOUT VOLTAGE (V)
0
12
1142 G09
2
68
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
4
10
70
°C
0
°C
25
°C
VOUT = 5V
TEMPERATURE (
°C)
0
175
150
125
100
75
50
25
0
80
1142 G12
20
40
60
100
MAXIMUM
THRESHOLD
MINIMUM
THRESHOLD
OUTPUT VOLTAGE (V)
0
80
70
60
50
40
30
20
10
0
4
1142 G11
1
2
3
5
VSENSE = VOUT
VOUT = 5V
VOUT = 3.3V
OPERATING FREQUENCY (kHz)
20
140
28
24
20
16
12
8
4
0
1142 G10
80
260
200
QN + QP = 100nC
QN + QP = 50nC
TYPICAL PERFOR A CE CHARACTERISTICS




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