Datasheet

LTC3630A
4
3630afa
For more information www.linear.com/LTC3630A
Typical perForMance characTerisTics
Efficiency and Power Loss
vs Load Current, V
OUT
= 5V
Efficiency and Power Loss
vs Load Current, V
OUT
= 3.3V
Efficiency and Power Loss
vs Load Current, V
OUT
= 1.8V
Soft-Start Waveform
Load Step Transient Response
Short-Circuit Response
elecTrical characTerisTics
Note that the maximum ambient temperature consistent with these
specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal impedance and
other environmental factors.
Note 4: This IC includes over temperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device. The overtemperature protection level is not production tested.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: For application concerned with pin creepage and clearance
distances at high voltages, the MSOP package should be used. See
Applications Information.
Note 7: At very high input voltages, the minimum output voltage that can
be maintained is limited to V
IN
– 65V if the load current is less than 5mA.
Refer to the High Input Voltage Considerations in the Operation section.
OUTPUT
VOLTAGE
2V/DIV
INDUCTOR
CURRENT
500mA/DIV
1ms/DIVC
OUT
= 100µF
FIGURE 13 CIRCUIT
3630a
G01
OUTPUT
VOLTAGE
50mV/DIV
LOAD
CURRENT
200mA/DIV
500µs/DIVV
IN
= 12V
V
OUT
= 5V
FIGURE 13 CIRCUIT
3630a
G02
OUTPUT
VOLTAGE
2V/DIV
INDUCTOR
CURRENT
500mA/DIV
200µs/DIVV
IN
= 12V
V
OUT
= 5V
FIGURE 13 CIRCUIT
3630a
G03
LOAD CURRENT (mA)
30
EFFICIENCY (%)
POWER LOSS (mW)
90
100
20
10
80
50
70
10
1
0.1
100
1000
60
40
0.1 10 100 1000
3630a G04
0
1
EFFICIENCY
V
OUT
= 5V
FIGURE 13 CIRCUIT
V
IN
= 12V
V
IN
= 70V
POWER LOSS
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3630a G05
0
1
EFFICIENCY
V
OUT
= 3.3V
FIGURE 13 CIRCUIT
V
IN
= 12V
V
IN
= 68V
POWER LOSS (mW)
10
1
0.1
100
1000
POWER LOSS
LOAD CURRENT (mA)
30
EFFICIENCY (%)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
3630a G06
0
1
EFFICIENCY
V
OUT
= 1.8V
FIGURE 13 CIRCUIT
V
IN
= 12V
V
IN
= 67V
POWER LOSS (mW)
10
1
0.1
100
1000
POWER LOSS