LTC3425 Linear Technology, LTC3425 Datasheet - Page 3

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

temperature range, otherwise specifications are at T
PARAMETER
PMOS Turn-Off Current
PMOS Reverse Current Limit
Max Duty Cycle
Min Duty Cycle
Frequency Accuracy
SHDN Input High
SHDN Input Low
SHDN Input Current
REFEN, CCM Input High
REFEN, CCM Input Low
REFEN, Input Current
SYNCIN Input High
SYNCIN Input Low
SYNCIN Input Current
CCM Input Current
SYNC Input Pulse Width Range
SYNC Out High
SYNC Out Low
REFOUT
Error Amp Transconductance
Error Amp Output High
Error Amp Output Low
PGOOD Threshold (Falling Edge)
PGOOD Hysteresis
PGOOD Low Voltage
PGOOD Leakage
SS Current Source
Burst Threshold Voltage
Burst Threshold Hysteresis
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Current is measured into the V
bootstrapped to the output. The current will reflect to the input supply by
V
Note 3: Once the output is started, the IC is not dependent on the V
supply.
Note 4: Total with all four FETs in parallel.
ELECTRICAL CHARACTERISTICS
OUT
/(V
IN
• Efficiency). The outputs are not switching.
OUTS
pin since the supply current is
CONDITIONS
CCM < 0.4V
CCM > 1.4V
R
V
V
V
V
V
(Note 7)
(Note 7)
V
V
REFEN > 1.4V, No Load
I
I
Referenced to Feedback Voltage
Referenced to Feedback Voltage
I
V
V
Falling Edge
SOURCE
LIM
SINK
OUT
OUT
SHDN
SHDN
REFEN
SYNCIN
CCM
PGOOD
SS
T
= 15k
= 1V
Resistor = 75k
= 0V (Initial Start-Up)
> 2.4V
= 1mA (10mA Max)
= 5V
A
= 5V or 0V
= 2V
= 5V
= 25 C. V
= 5.5V
= 5V
< 100 A, I
IN
The
SINK
IN
denotes the specifications which apply over the full operating
= 1.2V, V
< 10 A
Note 5: The LTC3425E is guaranteed to meet performance specifications
from 0 C to 70 C. Specifications over the –40 C to 85 C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 6: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125 C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 7: The typical logic threshold for this input is: V
OUT
= 3.3V, R
T
= 15k, unless otherwise noted.
1.190
1.184
0.65
–9.5
0.84
MIN
0.8
1.4
2.5
0.1
1.5
83
1
3
www.DataSheet4U.com
–0.50
1.220
1.220
–11.4
0.01
0.15
0.12
0.01
0.94
TYP
–80
120
0.6
0.01
0.3
2.2
2.5
2.7
90
50
1
2
LTC3425
OUT
/2
1.251
1.252
–13.5
MAX
0.25
0.25
1.04
1.2
0.4
0.5
0.4
97
0
1
1
1
4
4
1
UNITS
3
MHz
3425f
mA
mV
%
%
%
%
A
V
V
V
A
A
V
V
A
V
V
A
A
V
V
V
V
S
V
V
V
A
A
V
s