LTC3873 datasheet(5/16 Pages) LINER

Part #	LTC3873

Description	Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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5 / 16 page

LTC3873

5

3873fa

Frequency vs Temperature

Maximum Sense Threshold

vs Temperature

TYPICAL PERFORMANCE CHARACTERISTICS

IPRG (Pin 1/Pin 4): Current Sense Limit Select Pin.

ITH (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.

VFB (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 VIN.

VCC (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

100

200

300

50

150

250

–20

20

60

100

3873 G10

120

–40

–60

0

40

80

IPRG = VIN

IPRG = FLOAT

IPRG = GND

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