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LTC1628-SYNC Datasheet(PDF) 6 Page - Linear Technology

Part No. LTC1628-SYNC
Description  High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator
Download  32 Pages
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1628-SYNC Datasheet(HTML) 6 Page - Linear Technology

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6
LTC1628-SYNC
TEMPERATURE (
°C)
–50
–25
70
74
80
0
50
75
1628 G17
72
78
76
25
100
125
OUTPUT CURRENT (A)
0
0
1
2
3
4
0.5
1.0
1.5
2.0
1628 G18
2.5
3.0
3.5
4.0
RSENSE = 0.015Ω
RSENSE = 0.010Ω
VOUT = 5V
Maximum Current Sense
Threshold vs Temperature
Dropout Voltage vs Output Current
(Figure 14)
Soft-Start Up (Figure 14)
VOUT
5V/DIV
VRUN/SS
5V/DIV
IOUT
2A/DIV
VIN = 15V
5ms/DIV
1628 G19
VOUT = 5V
Load Step (Figure 14)
VOUT
200mV/DIV
IOUT
2A/DIV
VIN = 15V
20
µs/DIV
1628 G20
VOUT = 5V
LOAD STEP = 0A TO 3A
Burst Mode OPERATION
Load Step (Figure 14)
VOUT
200mV/DIV
IOUT
2A/DIV
VIN = 15V
20
µs/DIV
1628 G21
VOUT = 5V
LOAD STEP = 0A TO 3A
CONTINUOUS MODE
Input Source/Capacitor
Instantaneous Current (Figure 14)
IIN
2A/DIV
VIN
200mV/DIV
VSW1
10V/DIV
VIN = 15V
1
µs/DIV
1628 G22
VOUT = 5V
IOUT5 = IOUT3.3 = 2A
Burst Mode Operation (Figure 14)
VOUT
20mV/DIV
IOUT
0.5A/DIV
VIN = 15V
10
µs/DIV
1628 G23
VOUT = 5V
VFCB = OPEN
IOUT = 20mA
Constant Frequency (Burst Inhibit)
Operation (Figure 14)
VOUT
20mV/DIV
IOUT
0.5A/DIV
VIN = 15V
2
µs/DIV
1628 G24
VOUT = 5V
VFCB = 5V
IOUT = 20mA
VSW2
10V/DIV
RUN/SS Current vs Temperature
TEMPERATURE (
°C)
–50
–25
0
0.2
0.6
0.8
1.0
75
100
50
1.8
1628 G25
0.4
0
25
125
1.2
1.4
1.6
TYPICAL PERFOR A CE CHARACTERISTICS


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