LTC3425 Linear Technology, LTC3425 Datasheet - Page 4

• Manufacturer Part Number: LTC3425
• Description: 5A 8MHz 4-Phase Synchronous Step-Up DC/DC Converter
• Manufacturer: Linear Technology

LTC3425
TYPICAL PERFOR A CE CHARACTERISTICS
SWA TO SWD
4
100mV/DIV
CURRENT
0.5A/DIV
0.5A/DIV
V
5V/DIV
OUT
1V/DIV
2V/DIV
SS Pin
LOAD
V
OUT
AC
I
IN
SWA, SWB, SWC, SWD
at 1MHz/Phase
Soft-Start and Inrush Current
Limiting
Transient Response 0.5A to 1.5A
Fixed Frequency Mode Operation
V
V
C
V
V
C
IN
OUT
OUT
IN
OUT
SOFTSTART
= 2.4V
= 2.4V
= 3.3V
= 220 F
= 3.3V
= 0.015 F
250ns/DIV
100 s/DIV
500 s/DIV
W
U
3425 G01
3425 G04
3425 G07
50mV/DIV
SYNCOUT
50mV/DIV
V
V
2V/DIV
2V/DIV
2V/DIV
OUT
OUT
SWA
SWA
AC
AC
SW Pin and Oscillator SYNCOUT
Burst Mode Operation
V
V
C
Output Voltage Ripple at 2.5A
Load with Only Four 4.7 F
Ceramic Capacitors
V
V
FREQUENCY = 1MHz/PHASE
IN
OUT
OUT
IN
OUT
= 2.4V
= 2.4V
= 3.3V
= 220 F
= 3.3V
250ns/DIV
500ns/DIV
25 s/DIV
3425 G08
3425 G02
3425 G05
200mV/DIV
BURST PIN
10mV/DIV
0.2A/DIV
V
V
2V/DIV
1A/DIV
1V/DIV
OUT
OUT
I
SW
OUT
AC
AC
I
L
SW Pin and Inductor Current in
Discontinous Mode. Antiring
Circuit Eliminates High Frequency
Ringing
Transient Response 10mA to 1A
Automatic Burst Mode Operation
V
V
C
Output Voltage Ripple at 2.5A
Load with a 47 F Ceramic Bulk
Capacitor
V
V
FREQUENCY = 1MHz/PHASE
V
V
C
IN
OUT
OUT
IN
OUT
IN
OUT
OUT
= 2.4V
= 2.4V
= 2.4V
= 3.3V
= 220 F
= 3.3V
= 220 F
= 3.3V
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250ns/DIV
500ns/DIV
1ms/DIV
3425 G03
3425 G06
3425 G10
3425f