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LTC3858 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC3858
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

LTC3858 Datasheet(HTML) 6 Page - Linear Technology

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LTC3858

3858fa
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
3858 G10
200
100
10
15
25
50
0
400
300
250
150
30
35
40
300µA LOAD
FIGURE 12 CIRCUIT
VOUT = 3.3V
ONE CHANNEL ON
NO LOAD
TEMPERATURE (°C)
–45
5.4
30
3858 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
3858 G12
25
30
35
40
VSENSE COMMON MODE VOLTAGE (V)
0
–600
–500
–550
–450
–400
–300
–350
–200
–250
0
5
10
15
20
3858 G14
25
–50
–100
–150
FEEDBACK VOLTAGE (V)
0
0
10
30
40
50
0.6
90
3858 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
3858 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
3858 G15
20
0
20
40 50
100
80
60
10
30
90
70
ILIM = INTVCC
ILIM = FLOAT
ILIM = GND
TEMPERATURE (°C)
–45
110
190
–20
30
55
130
3858 G17
230
210
150
130
170
5
80
105
PLLIN/MODE = 0
VIN = 12V
VOUT = 3.3V
ONE CHANNEL ON
TEMPERATURE (°C)
–45
8
9
10
30
80
3858 G18
7
6
–20
5
55
105
130
5
4



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