LTC3780
TA = 25°C, unless otherwise noted.
TYPICAL PERFORMANCE CHARACTERISTICS
Load Step
Load Step
Load Step
V
V
V
OUT
500mV/DIV
OUT
OUT
500mV/DIV
500mV/DIV
I
L
I
5A/DIV
I
L
L
5A/DIV
5A/DIV
3780 G28
3780 G29
3780 G27
V
V
= 12V
200μs/DIV
V
V
= 6V
200μs/DIV
V
V
= 18V
200μs/DIV
IN
OUT
IN
OUT
IN
OUT
= 12V
= 12V
= 12V
LOAD STEP: 0A TO 5A
CONTINUOUS MODE
LOAD STEP: 0A TO 5A
CONTINUOUS MODE
LOAD STEP: 0A TO 5A
CONTINUOUS MODE
Line Transient
Line Transient
V
IN
V
IN
10V/DIV
10V/DIV
V
OUT
V
OUT
500mV/DIV
500mV/DIV
I
I
L
L
1A/DIV
1A/DIV
3780 G30
3780 G31
V
I
IN
= 12V
= 1A
500μs/DIV
V
I
= 12V
= 1A
500μs/DIV
OUT
LOAD
OUT
LOAD
IN
V
STEP: 7V TO 20V
V
STEP: 20V TO 7V
CONTINUOUS MODE
CONTINUOUS MODE
PIN FUNCTIONS (SSOP/QFN)
PGOOD (Pin 1/Pin 30): Open-Drain Logic Output. PGOOD
is pulled to ground when the output voltage is not within
7.5% of the regulation point.
–
+
voltage and built-in offsets between SENSE and SENSE
pins, in conjunction with R
threshold.
, set the current trip
SENSE
–
SS (Pin 2/Pin 31): Soft-start reduces the input power
sources’ surge currents by gradually increasing the
controller’s current limit. A minimum value of 6.8nF is
recommended on this pin.
SENSE (Pin 4/Pin 2): The (–) Input to the Current Sense
and Reverse Current Detect Comparators.
I
(Pin 5/Pin 3): Current Control Threshold and Error
TH
Amplifier Compensation Point. The current comparator
threshold increases with this control voltage. The voltage
ranges from 0V to 2.4V.
+
SENSE (Pin 3/Pin 1): The (+) Input to the Current Sense
and Reverse Current Detect Comparators. The I pin
TH
3780fe
9
Linear Systems [ Linear Systems ]
