LTC3637_15 Datasheet, PDF (4/26 Pages) Linear Technology – 76V, 1A Step-Down Regulator

LTC3637
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
Efficiency and Power Loss
vs Load Current, V_OUT = 5V
100
V_OUT = 5V, FIGURE 13 CIRCUIT
90
80
70
EFFICIENCY
60
1000
50
POWER LOSS
40
100
30
20
10
0
0.1
V_IN = 12V ¹⁰
V_IN = 24V
V_IN = 70V
0
1.0
10
100
1000
LOAD CURRENT (mA)
3637 G01
Efficiency vs Input Voltage
100
V_OUT = 5V
FIGURE 13 CIRCUIT
90
80
70
60
I_LOAD = 1A
I_LOAD = 100mA
I_LOAD = 10mA
I_LOAD = 1mA
50
0 10 20 30 40 50 60 70 80
INPUT VOLTAGE (V)
3637 G04
Efficiency and Power Loss
vs Load Current, V_OUT = 3.3V
100
V_OUT = 3.3V
90 FIGURE 13 CIRCUIT
EFFICIENCY
80
70
60
1000
50
POWER LOSS
40
100
30
20
10
0
0.1
V_IN = 12V ¹⁰
V_IN = 24V
V_IN = 68V
0
1.0
10
100
1000
LOAD CURRENT (mA)
3637 G02
Line Regulation vs Input Voltage
0.05
0.04
V_OUT = 5V
I_LOAD = 1A
0.03 ^{FIGURE 13 CIRCUIT}
0.02
0.01
0
–0.01
–0.02
–0.03
–0.04
–0.05
5
15 25 35 45 55 65 75
INPUT VOLTAGE (V)
3637 G05
Efficiency and Power Loss
vs Load Current, V_OUT = 1.8V
100
V_OUT = 1.8V
90 FIGURE 13 CIRCUIT
80
EFFICIENCY
70
60
1000
50
40
100
30
POWER LOSS
20
10
0
0.1
V_IN = 12V ¹⁰
V_IN = 24V
V_IN = 67V
0
1.0
10
100
1000
LOAD CURRENT (mA)
3637 G03
Load Regulation vs Load Current
5.02
V_IN = 12V
V_OUT = 5V
FIGURE 13 CIRCUIT
5.01
5.00
4.99
4.98
0 100 200 300 400 500 600 700 800 900 1000
LOAD CURRENT (mA)
3637 G06
3637fa
4
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