LTC3873
5
3873fb
For more information www.linear.com/LTC3873
Frequency vs Temperature
Maximum Sense Threshold
vs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
IPRG (Pin 1/Pin 4): Current Sense Limit Select Pin.
I
TH
(Pin 2/Pin 3): This pin serves as the error amplifier
compensation point. Nominal voltage range for this pin
is 0.7V to 1.9V.
V
FB
(Pin 3/Pin 2): This pin receives the feedback voltage
from an external resistor divider across the output.
GND (Pin 4/Pin 1): Ground Pin.
NGATE (Pin 5/Pin 8): Gate Drive for the External N-Channel
MOSFET. This pin swings from 0V to V
IN
.
V
CC
(Pin 6/Pin 7): Supply Pin. This pin must be closely
decoupled to GND (Pin 4).
PIN FUNCTIONS
(TS8/DDB)
RUN/SS (Pin 7/Pin 6): Shutdown and External Soft-Start
Pin. In shutdown, all functions are disabled and the NGATE
pin is held low.
SW (Pin 8/Pin 5): Switch node connection to inductor and
current sense input pin through external slope compensa
-
tion resistor. Normally, the external N-channel MOSFET’s
drain is connected to this pin.
Exposed Pad (NA/Pin 9):
Ground. Must be soldered to PCB
for electrical contact and rated thermal performance.
TEMPERATURE (°C)
–60
210
230
250
100
3873 G09
190
170
150
–40 –20 0
20 40
60 80
120
TEMPERATURE (°C)
0
MAXIMUM SENSE THRESHOLD (mV)
100
200
300
50
150
250
–20 20 60 100
3873 G10
120–40–60 0 40 80
IPRG = V
IN
IPRG = FLOAT
IPRG = GND
