LTC3703
elecTrical characTerisTics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 5: The dynamic input supply current is higher due to the power
MOSFET gate charge being delivered at the switching frequency (Q • f ).
Note 6: Guaranteed by design. Not subject to test.
G
OSC
Note 7: This IC includes overtemperature protection that is intended
Note 2: The LTC3703E is guaranteed to meet performance specifications from
0°C to 85°C. Specifications over the –40°C to 85°C operating temperature
range are assured by design, characterization and correlation with statistical
process controls. The LTC3703I is guaranteed over the full –40°C to 125°C
operating junction temperature range. The LTC3703H is guaranteed over the
full –40°C to 150°C operating junction temperature range.
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 8: R
guaranteed by correlation to wafer level measurement.
DS(ON)
Note 9: High junction temperatures degrade operating lifetimes. Operating
lifetime at junction temperatures greater than 125°C is derated to 1000 hours.
Note 10: Transient voltages (such as due to inductive ringing) are allowed
beyond this range provided that the voltage does not exceed 10V below
ground and duration does not exceed 20ns per switching cycle.
Note 3: T is calculated from the ambient temperature T and power
J
A
dissipation P according to the following formula:
D
LTC3703: T = T + (P • 100 °C/W) G Package
J
A
D
Note 4: The LTC3703 is tested in a feedback loop that servos V to the
FB
reference voltage with the COMP pin forced to a voltage between 1V and 2V.
T = 25°C unless otherwise noted.
A
Typical perForMance characTerisTics
Efficiency vs Input Voltage
Efficiency vs Load Current
Load Transient Response
100
95
90
85
80
75
70
100
95
90
85
80
75
70
I
= 5A
OUT
V
OUT
50mV/DIV
V
= 15V
IN
V
= 45V
IN
I
= 0.5A
OUT
V
= 75V
IN
I
OUT
2A/DIV
3703 G03
V
= 5V
V
= 12V
OUT
V
V
= 50V
50µs/DIV
OUT
IN
OUT
f = 250kHz
PULSE SKIP ENABLED
f = 300kHz
PULSE SKIP DISABLED
= 12V
1A TO 5A LOAD STEP
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
LOAD CURRENT (A)
0
40
INPUT VOLTAGE (V)
60 70
10 20 30
50
80
3703 G02
3703 G01
VCC Shutdown Current vs
VCC Voltage
VCC Current vs VCC Voltage
VCC Current vs Temperature
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
4
3
2
1
0
100
90
80
70
60
50
40
30
20
10
0
COMP = 1.5V
COMP = 1.5V
V
= 0V
FB
V
= 0V
FB
50 75
TEMPERATURE (°C)
125
150
–50 –25
0
25
8
10
VOLTAGE (V)
12
14
16
100
6
6
8
10
12
14
16
V
V
VOLTAGE (V)
CC
CC
3703 G05
3703 G04
3703 G06
3703fc
4
Linear Systems [ Linear Systems ]
