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LTC3425EUH#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LTC3425
4
3425f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
SWA, SWB, SWC, SWD
at 1MHz/Phase
SW Pin and Oscillator SYNCOUT
SW Pin and Inductor Current in
Discontinous Mode. Antiring
Circuit Eliminates High Frequency
Ringing
Transient Response 0.5A to 1.5A
Fixed Frequency Mode Operation
Output Voltage Ripple at 2.5A
Load with Only Four 4.7µF
Ceramic Capacitors
Soft-Start and Inrush Current
Limiting
Burst Mode Operation
SWA TO SWD
5V/DIV
250ns/DIV
3425 G01
SWA
2V/DIV
250ns/DIV
3425 G02
SYNCOUT
2V/DIV
V
IN
= 2.4V 250ns/DIV 3425 G03
V
OUT
= 3.3V
C
OUT
= 220µF
I
L
0.2A/DIV
SW
2V/DIV
V
IN
= 2.4V 100µs/DIV 3425 G04
V
OUT
= 3.3V
C
OUT
= 220µF
V
OUT
AC
100mV/DIV
LOAD
CURRENT
0.5A/DIV
V
IN
= 2.4V 500ns/DIV 3425 G05
V
OUT
= 3.3V
FREQUENCY = 1MHz/PHASE
V
OUT
AC
50mV/DIV
Output Voltage Ripple at 2.5A
Load with a 47µF Ceramic Bulk
Capacitor
V
IN
= 2.4V 500ns/DIV 3425 G06
V
OUT
= 3.3V
FREQUENCY = 1MHz/PHASE
V
OUT
AC
10mV/DIV
V
IN
= 2.4V 500µs/DIV 3425 G07
V
OUT
= 3.3V
C
SOFTSTART
= 0.015µF
I
IN
0.5A/DIV
SS Pin
1V/DIV
V
OUT
2V/DIV
V
IN
= 2.4V 25µs/DIV 3425 G08
V
OUT
= 3.3V
C
OUT
= 220µF
SWA
2V/DIV
V
OUT
AC
50mV/DIV
Transient Response 10mA to 1A
Automatic Burst Mode Operation
V
IN
= 2.4V 1ms/DIV 3425 G10
V
OUT
= 3.3V
C
OUT
= 220µF
I
OUT
1A/DIV
BURST PIN
1V/DIV
V
OUT
AC
200mV/DIV
LTC3425
5
3425f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Converter Efficiency
for V
OUT
= 3.3V
Converter Efficiency for 2-, 3- and
4-Phase Operation
Efficiency Comparison of
Discontinuous Mode and Forced
Continuous Mode at Light Loads
for V
IN
= 2.4V, V
OUT
= 3.3V
Converter No Load Input Current
vs V
IN
(Burst Mode Operation)
Oscillator Frequency Peak Current Limit
OUTPUT CURRENT (mA)
0.1 1
70
EFFICIENCY (%)
80
90
10 100 1000 10000
3425 G11
60
50
40
30
20
10
0
100
V
IN
= 2.4V
V
IN
= 1.2V
V
IN
= 1.2V
V
IN
= 2.4V
T
A
= 25°C
Burst Mode OPERATION
1MHz/PHASE
OUTPUT CURRENT (mA)
0.1 1
70
EFFICIENCY (%)
80
90
10 100 1000 10000
3425 G12
60
0
10
20
30
40
50
100
T
A
= 25°C
V
IN
= 3.3V
V
IN
= 3.3V
V
IN
= 2.4V
V
IN
= 2.4V
Burst Mode OPERATION
1MHz/PHASE
Converter Efficiency
for V
OUT
= 5V
LOAD (mA)
100
80
EFFICIENCY (%)
84
82
86
88
90
92
94
96
1000 10000
3425 G13
98
4 PHASE
T
A
= 25°C
V
IN
= 2.4V
V
OUT
= 3.3V
1MHz/PHASE
3 PHASE
2 PHASE
CONVERTER OUTPUT CURRENT (mA)
1
40
EFFICIENCY (%)
50
60
70
80
10 100 1000
3425 G14
30
20
10
0
90
100
T
A
= 25°C
1MHz/PHASE
DISCONTINUOUS
MODE
FORCED
CONTINUOUS
MODE
LOAD (mA)
1
40
EFFICIENCY (%)
50
60
70
80
10 100 1000
3425 G15
30
20
10
0
90
100
T
A
= 25°C
1MHz/PHASE
DISCONTINUOUS
MODE
FORCED
CONTINUOUS
MODE
Efficiency Comparison of
Discontinuous Mode and Forced
Continuous Mode at Light Loads
for V
IN
= 3.3V, V
OUT
= 5V
V
IN
(V)
1.5
140
120
100
80
60
40
20
0
3.0 4.0
3425 G16
2.0 2.5
3.5 4.5
CONVERTER INPUT CURRENT (µA)
T
A
= 25°C
V
OUT
= 3.3V
V
OUT
= 5V
R
T
(kΩ)
1
1
FREQUENCY (MHz)
10
10 100
3425 G17
T
A
= 25°C
I
LIM
RESISTOR (kΩ)
60
PEAK CURRENT IN EACH PHASE (A)
1.4
1.6
1.8
120 160
3425 G18
1.2
1.0
80 100
140 180 200
0.8
0.6
T
A
= 25°C
Effective R
DS(ON)
V
OUT
(V)
2.5
R
DS(ON)
(ALL FOUR PHASES IN PARALLEL)
0.065
0.060
0.055
0.050
0.045
0.040
4.5
3425 G19
3
3.5
4
5
T
A
= 25°C
PMOS
NMOS
LTC3425
6
3425f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Maximum Output Current
in Burst Mode Operation
V
IN
(V)
1 1.5
OUTPUT CURRENT (mA)
200
250
300
4
3425 G20
150
100
23
4.5
2.5 3.5 5
50
0
350
V
OUT
= 3.3V
V
OUT
= 5V
T
A
= 25°C
V
IN
(V)
0.9
0.4
0.5
0.7
1.2 1.4
3425 G21
0.3
0.2
1.0 1.1
1.3 1.5 1.6
0.1
0
0.6
LOAD CURRENT (A)
T
A
= 25°C
V
OUT
= 3.3V
V
OUT
= 5V
Maximum Start-Up Load vs V
IN
(Constant Current Load)
Soft-Start Charging Current
vs Temperature
Automatic Burst Mode Current
Thresholds vs R
BURST
BURST RESISTOR (kΩ)
10
1
AVERAGE LOAD CURRENT (mA)
10
100
100 1000
3425 G22
T
A
= 25°C
ENTER
Burst Mode
OPERATION
LEAVE
Burst Mode
OPERATION
V
IN
(V)
1.5
LOAD CURRENT (mA)
70
80
90
100
3.5
3425 G23
60
50
40
2
2.5
3
4
V
OUT
= 5V
T
A
= 25°C
R
BURST
= 33k
V
OUT
= 5V
V
OUT
= 3.3V
LEAVE Burst Mode OPERATION
ENTER Burst Mode OPERATION
V
OUT
= 3.3V
TEMPERATURE (°C)
–45
0
SS CHARGE CURRENT (µA)
0.5
1.0
1.5
2.0
3.0
–25
–5 15 35 7555
3425 G24
95 115
2.5
V
IN
> 2.3V
V
IN
< 2.3V
(START-UP MODE)
Automatic Burst Mode Thresholds
vs V
IN
PGOOD Threshold vs Temperature
Shutdown Voltage vs Temperature
Minimum Start-Up Voltage
vs Temperature
TEMPERATURE (°C)
–45
0.300
SHUTDOWN VOLTAGE (V)
0.325
0.350
0.375
0.400
0.450
–25
–5 15 35 7555
3425 G25
95 115
0.425
TEMPERATURE (°C)
–45
0.70
START VOLTAGE (V)
0.75
0.80
0.85
0.90
1.00
–25
–5 15 35 7555
3425 G26
95 115
0.95
TEMPERATURE (°C)
–45
10.8
PGOOD THRESHOLD (1% BELOW V
FB
)
11.0
10.9
11.1
11.5
11.4
11.3
11.2
11.6
11.8
–25
–5 15 35 7555
3425 G27
95 115
11.7
PMOS Reverse Current in Forced
CCM vs Temperature
TEMPERATURE (°C)
–45
300
PMOS REVERSE CURRENT (mA)
400
350
450
650
600
550
500
700
800
–25
–5 15 35 7555
3425 G28
95 115
750
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LTC3425EUH#TRPBF

Mfr. #:
Buy LTC3425EUH#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 5A, 8MHz, 4-Ph Sync Boost DC/DC Conv
Lifecycle:
New from this manufacturer.
Delivery:
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