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LTC3868IGN-1PBF Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3868IGN-1PBF
Description  Low IQ, Dual 2-Phase Synchronous Step-Down Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3868IGN-1PBF Datasheet(HTML) 6 Page - Linear Technology

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LTC3868-1

38681fb
Typical perForMance characTerisTics
Total Input Supply Current
vs Input Voltage
EXTVCC Switchover and INTVCC
Voltages vs Temperature
INTVCC Line Regulation
Maximum Current Sense Voltage
vs ITH Voltage
SENSEPins Input Bias Current
Maximum Current Sense
Threshold vs Duty Cycle
Foldback Current Limit
Quiescent Current vs Temperature
Shutdown Current vs Temperature
INPUT VOLTAGE (V)
5
350
20
38681 G10
200
100
10
15
25
28
50
0
400
300
250
150
300µA LOAD
FIGURE 12 CIRCUIT
VOUT = 3.3V
ONE CHANNEL ON
NO LOAD
TEMPERATURE (°C)
–45
5.4
30
38681 G11
4.8
4.4
–20
5
55
4.2
4.0
5.6
5.2
5.0
4.6
80
105 130
INTVCC
EXTVCC RISING
EXTVCC FALLING
INPUT VOLTAGE (V)
0
5.0
5.1
5.1
5.2
5.2
5
10
15
20
38681 G12
25 28
VSENSE COMMON MODE VOLTAGE (V)
0
–600
–500
–550
–450
–400
–300
–350
–200
–250
0
5
10
15
38681 G14
–50
–100
–150
FEEDBACK VOLTAGE (V)
0
0
10
30
40
50
0.6
90
38681 G16
20
0.3
0.1
0.7
0.4
0.2
0.8
0.5
0.9
60
70
80
ITH PIN VOLTAGE
0
40
60
80
0.6
1.0
38681 G13
20
0
0.2
0.4
0.8
1.2
1.4
–20
–40
PULSE-SKIPPING
FORCED CONTINUOUS
Burst Mode OPERATION
(FALLING)
Burst Mode OPERATION
(RISING)
5% DUTY CYCLE
DUTY CYCLE (%)
0
40
60
80
38681 G15
20
0
20
40 50
100
80
60
10
30
90
70
TEMPERATURE (°C)
–45
110
120
190
200
240
220
–20
30
55
130
38681 G17
230
210
150
160
130
140
180
170
5
80
105
PLLIN/MODE = 0
VIN = 12V
VOUT = 3.3V
ONE CHANNEL ON
TEMPERATURE (°C)
–45
8
9
10
30
80
38681 G18
7
6
–20
5
55
105
130
5
4


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