LTC3630
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.
TYPICAL PERFORMANCE CHARACTERISTICS
Soft-Start Waveform
OUTPUT
VOLTAGE
2V/DIV
OUTPUT
VOLTAGE
50mV/DIV
Load Step Transient Response
OUTPUT
VOLTAGE
2V/DIV
Short-Circuit Response
INDUCTOR
CURRENT
500mA/DIV
C
OUT
= 100μF
1ms/DIV
FIGURE 13 CIRCUIT
3630 G01
LOAD
CURRENT
200mA/DIV
V
IN
= 12V
500μs/DIV
V
OUT
= 5V
FIGURE 13 CIRCUIT
3630 G02
INDUCTOR
CURRENT
500mA/DIV
V
IN
= 12V
200μs/DIV
V
OUT
= 5V
FIGURE 13 CIRCUIT
3630 G03
Efficiency and Power Loss
vs Load Current, V
OUT
= 5V
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0.1
1
POWER
10
V
OUT
= 5V
FIGURE 13 CIRCUIT
V
IN
= 12V
1
V
IN
= 65V
10
100
LOAD CURRENT (mA)
1000
3630 G04
Efficiency and Power Loss
vs Load Current, V
OUT
= 3.3V
100
90
100
Efficiency and Power Loss
vs Load Current, V
OUT
= 1.8V
V
OUT
= 1.8V
90 FIGURE 13 CIRCUIT
80
1000
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0.1
1
V
IN
= 12V 1
V
IN
= 65V
10
100
LOAD CURRENT (mA)
1000
3630 G06
EFFICIENCY
EFFICIENCY (%)
1000
POWER LOSS (mW)
80
70
60
50
40
30
20
10
0
0.1
1
EFFICIENCY
POWER LOSS (mW)
EFFICIENCY
1000
POWER LOSS (mW)
100
100
POWER
10
V
OUT
= 3.3V
FIGURE 13 CIRCUIT
V
IN
= 12V
1
V
IN
= 65V
10
100
LOAD CURRENT (mA)
1000
3630 G05
100
POWER
10
3630fb
4
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
