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LTC3868 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3868
Description  Low IQ, Dual 2-Phase Synchronous Step-Down Controller
PDF  38 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3868 Datasheet(HTML) 6 Page - Linear Technology

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LTC3868

3868fb
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
SENSE– Pin 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
3868 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
3868 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
3868 G12
25 28
VSENSE COMMON MODE VOLTAGE (V)
0
–600
–500
–550
–450
–400
–300
–350
–200
–250
0
5
10
15
3868 G14
–50
–100
–150
FEEDBACK VOLTAGE (V)
0
0
10
30
40
50
0.6
90
3868 G16
20
0.3
0.1
0.7
0.4
0.2
0.8
0.5
0.9
60
70
80
ILIM = INTVCC
ILIM = FLOAT
ILIM = GND
ITH PIN VOLTAGE
0
40
60
80
0.6
1.0
3868 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)
ILIM = GND
ILIM = FLOAT
ILIM = INTVCC
5% DUTY CYCLE
DUTY CYCLE (%)
0
40
60
80
3868 G15
20
0
20
40 50
100
80
60
10
30
90
70
ILIM = INTVCC
ILIM = FLOAT
ILIM = GND
TEMPERATURE (°C)
–45
110
120
190
200
240
220
–20
30
55
130
3868 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
3868 G18
7
6
–20
5
55
105
130
5
4



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