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LT3653

3653f

TYPICAL PERFORMANCE CHARACTERISTICS

VC Current

VC Operating Range

PIN FUNCTIONS

VIN (Pin 1): The VIN pin supplies current to the LT3653’s

internal regulator and the internal power switch. Locally

bypass this pin with a capacitor.

HVOK (Pin 2): The HVOK pin is a status pin which indi-

cates that the internal bias rail is present and that an input

undervoltage lockout fault, an overvoltage lockout fault or

an over temperature fault are not present.

VC (Pin 3): The VC pin is the output of the internal error

ampliﬁer and is internally compensated. The voltage on this

pin controls the peak switch current. Connect this pin to

the battery charger VC pin for battery tracking function.

ILIM (Pin 4): Connect a resistor to GND to program the

output current limit of the regulator. See the ILIM Resistor

section in Application Information.

VOUT (Pin 5): The VOUT pin is connected to the negative

terminal of the internal current sense resistor of the output

current limit circuit. Maximum VOUT voltage is regulated

to 4.8V.

ISENSE (Pin 6): The ISENSE pin is the positive input to the

internal current sense resistor of the output current limit

circuit. The ISENSE pin is also the anode of the internal

BOOST diode.

BOOST (Pin 7): The BOOST pin provides a drive voltage,

higher than the input voltage, to the internal power switch.

The BOOST pin is internally connected to the cathode of

the BOOST diode.

SW (Pin 8): The SW pin is the output of the internal power

switch. Connect this pin to the inductor, catch diode and

boost capacitor.

Exposed Pad (Pin 9): Ground. The Exposed Pad must be

soldered to the PCB and electrically connected to ground.

Use a large ground plane and vias to optimize thermal

performance.

VOUT (V)

3653 G09

–25

–20

–15

–10

–5

4.4

4.8

5.2

5.6

TEMPERATURE (ºC)

2.0

1.8

0.0

3653 G10

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

-50

-25

100

125

CURRENT LIMIT CLAMP

SWITCHING THRESHOLD

TA = 25°C unless otherwise noted

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