LTC3630A Datasheet, PDF (4/24 Pages) Linear Technology – High Efficiency, 76V 500mA Synchronous Step-Down Converter

LTC3630A
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.
Typical Performance Characteristics
Soft-Start Waveform
OUTPUT
VOLTAGE
2V/DIV
Load Step Transient Response
OUTPUT
VOLTAGE
50mV/DIV
Short-Circuit Response
OUTPUT
VOLTAGE
2V/DIV
INDUCTOR
CURRENT
500mA/DIV
C_OUT = 100µF 1ms/DIV
FIGURE 13 CIRCUIT
3630a G01
LOAD
CURRENT
200mA/DIV
V_IN = 12V
500µs/DIV
V_OUT = 5V
FIGURE 13 CIRCUIT
3630a G02
INDUCTOR
CURRENT
500mA/DIV
V_IN = 12V
200µs/DIV
V_OUT = 5V
FIGURE 13 CIRCUIT
3630a G03
Efficiency and Power Loss
vs Load Current, V_OUT = 5V
100
90
EFFICIENCY
80
1000
70
60
100
50
40
POWER LOSS 10
30
20
10
0
0.1
V_OUT = 5V
FIGURE 13 CIRCUIT
1
V_IN = 12V
V_IN = 70V _0.1
1
10
100
1000
LOAD CURRENT (mA)
3630a G04
Efficiency and Power Loss
vs Load Current, V_OUT = 3.3V
100
90
80
EFFICIENCY
1000
70
60
100
50
40
30
20
10
0
0.1
POWER LOSS ¹⁰
V_OUT = 3.3V
FIGURE 13 CIRCUIT
1
V_IN = 12V
V_IN = 68V _0.1
1
10
100
1000
LOAD CURRENT (mA)
3630a G05
Efficiency and Power Loss
vs Load Current, V_OUT = 1.8V
100
V_OUT = 1.8V
90 _{FIGURE 13 CIRCUIT}
80
EFFICIENCY
1000
70
60
100
50
40
10
30
POWER LOSS
20
1
10
0
0.1
V_IN = 12V
V_IN = 67V _0.1
1
10
100
1000
LOAD CURRENT (mA)
3630a G06
3630af
4
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