LTC3336ACBZ-2-R7 datasheet(11/24 Pages) AD

11 / 24 page

LTC3336

Rev. A

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PIN FUNCTIONS

VIN (Pin 1/Pin B3): 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/Pin A1): Buck Enable Input. Logic level input

referenced 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, LQFN Only): Inductor Peak Current Select

Bit (with IPK0). See IPK0. IPK1 is internally tied to GND in

the WLCSP of LTC3336-1 and is internally tied to INTVCC

in the WLCSP of LTC3336-2.

IPK0 (Pin 4/Pin B2): Inductor Peak Current Select Bit

(with IPK1). IPK0 should be tied to INTVCC to select 1

or to GND to select 0 to program the desired IPEAK (see

Table 1 in the Operation section).

INTVCC (Pin 5/Pin B1): VCC Supply for Internal Circuits.

Voltage output used as the logic high reference for input

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

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

bypass capacitor integrated inside. For the WLCSP an

external bypass capacitor of at least 100nF must be con-

nected between INTVCC and GND.

PGOOD (Pin 6/Pin C1): Buck Power Good Output. The

PGOOD pin is high (referenced to VOUT) when the buck

regulator output VOUT is in regulation. PGOOD is low

when EN is low.

OUT3 (Pin 7/Pin D1): Output Voltage Select Bit (with

OUT2, OUT1 and OUT0). Tie this pin to INTVCC or VOUT

(for logic 1) or to GND (for logic 0) to statically pro-

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

dynamically changing VOUT, refer to the the Applications

Information section for alternate hookups.

OUT2 (Pin 8/Pin D2): Output Voltage Select Bit (with

OUT3, OUT1 and OUT0). See OUT3.

OUT1 (Pin 9/Pin D3): Output Voltage Select Bit (with

OUT3, OUT2 and OUT0). See OUT3.

OUT0 (Pin 10/Pin C2): Output Voltage Select Bit (with

OUT3, OUT2 and OUT1). See OUT3.

VOUT (Pin 11/Pin C3): 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/Pin A3): Switch Pin of the Buck Regulator.

An inductor should be connected from SW to VOUT. The

inductor value is dependent on the actual IPEAK setting.

See Table 4 in the Applications Information section.

GND (Exposed Pad Pin 13/Pin A2): Ground. This pin must

be soldered to the PCB. This pin provides both electrical

and with the LQFN also thermal-connection to the printed

circuit board.

(LQFN/WLCSP)

LTC3336ACBZ-2-R7 Datasheet(PDF) 11 Page - Analog Devices

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