LTC3336 datasheet(11/22 Pages) AD

11 / 22 page

LTC3336

Rev. 0

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PIN FUNCTIONS

VIN (Pin 1): Input Voltage. Connect the battery input

as close as possible to this pin along with an appro-

priately-sized bypass capacitor (see the Applications

Information section).

EN (Pin 2): Buck Enable Input. Logic level input refer-

enced to INTVCC. A logic high on EN enables the buck

converter. A logic low prevents the regulator from switch-

ing and discharges VOUT with a 10k resistor to ground.

IPK1 (Pin 3): Inductor Peak Current Select Bit (with IPK0).

See IPK0.

IPK0 (Pin 4): Inductor Peak Current Select Bit (with IPK1).

IPK0 should be tied to INTVCC to select high or to GND

to select low to program the desired IPEAK (see Table 1 in

the Operation section).

INTVCC (Pin 5): VCC Supply for Internal Circuits. Voltage

output used as the logic high reference for input pins

EN and IPK[1:0]. The allowed external DC load current

at INTVCC is limited to 10µA. The LQFN package has a

bypass capacitor integrated inside.

PGOOD (Pin 6): Buck Power Good Output. The PGOOD

pin is high (referenced to VOUT) when the buck regula-

tor output VOUT is in regulation. PGOOD is low when EN

is low.

OUT3 (Pin 7): Output Voltage Select Bit (with OUT2,

OUT1, and OUT0). Tie this pin to INTVCC or VOUT (for

logic high) or to GND (for logic low) to statically program

VOUT (see Table 2 in the Operation section). For dynami-

cally changing VOUT, refer to the Applications Information

section for alternate hookups.

OUT2 (Pin 8): Output Voltage Select Bit (with OUT3,

OUT1, and OUT0). See OUT3.

OUT1 (Pin 9): Output Voltage Select Bit (with OUT3,

OUT2, and OUT0). See OUT3.

OUT0 (Pin 10): Output Voltage Select Bit (with OUT3,

OUT2, and OUT1). See OUT3.

VOUT (Pin 11): Output Voltage Sense Input. The voltage

level VOUT is also used as the logic high reference for input

pins OUT[3:0] and output pin PGOOD.

SW (Pin 12): Switch Pin of the Buck Regulator. An induc-

tor should be connected from SW to VOUT. The induc-

tor value is dependent on the actual IPEAK setting. See

Inductor Selection in the Applications Information section.

GND (Exposed Pad Pin 13): Ground. This pin must be

soldered to the PCB. This pin provides both electrical con-

tact to ground and good thermal contact to the printed

circuit board.

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