LTC3459 datasheet(6/12 Pages) LINER

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LTC3459

3459fc

PIN FUNCTIONS

VIN (Pin 1/Pin 6/Pin 6): Input Supply Pin. Bypass VIN with

a low ESR, ESL ceramic capacitor of at least 1μF.

VOUT (Pin 2/Pin 2/Pin 5): Regulated Output Voltage of

the Boost Regulator. Bypass VOUT with a low ESR, ESL

ceramic capacitor between 2.2μF and 10μF. VOUT ripple

increases with smaller capacitors.

SHDN(Pin3/Pin1/Pin4):MasterShutdownInput.Driving

SHDN low disables all IC functions and reduces quiescent

current from the battery to less than 1μA. This pin must

be pulled above 1V to enable the IC.

FB (Pin 4/Pin 3/Pin 3): Input to the Burst Mode Comparator.

An external resistor divider connected between VOUT,

GND and this pin sets the output voltage to:

VOUT = 1.22(1 + R1/R2)

GND (Pin 5/Pin 5/Pin 2): Signal and Power Ground. Provide

a short, direct PCB path between GND and the (–) side of

the ﬁlter capacitors on VIN and VOUT.

SW (Pin 6/Pin 4/Pin 1): Switch Pin. Connect a 15μH to

33μH inductor between SW and VIN.KeepPCBtracelengths

as short and wide as possible to reduce EMI and voltage

overshoot. If the inductor current falls to zero, the internal

P-channel MOSFET synchronous rectiﬁer is turned off to

prevent reverse charging of the inductor.

Exposed Pad (Pin 7/Pin 7, DC and DCB Packages Only):

Ground. The Exposed Pad must be soldered to PCB.

(DC/DCB/S6 Packages)

BLOCK DIAGRAM

VIN

IZERO

DETECT

IZO

IPEAK

tOFF

VCC

VOUT

SLEEP

DELAY

IPEAK

DETECT

tOFF

TIMER

VSELECT

VBEST

P-DRIVE

HYSTCOMP

N-DRIVE

SW1

VOUT

SDB

3459 BD

THERMAL

VSELECT

VBEST

VCC

P/~N

IZO

SDB

N-DRIVE

P-DRIVE

REFERENCE

VCC

SHDN

GND

REFOK

OFF ON

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