LTC3526 datasheet(6/16 Pages) LINER

6 / 16 page

LTC3526/LTC3526B

3526bfd

SW(Pin1):SwitchPin.ConnectinductorbetweenSWand

VIN. Keep PCB trace lengths as short and wide as possible

to reduce EMI. If the inductor current falls to zero or SHDN

is low, an internal anti-ringing switch is connected from

SW to VIN to minimize EMI.

GND (Pin 2): Signal and Power Ground. Provide a short

direct PCB path between GND and the (–) side of the input

and output capacitors.

VIN (Pin 3): Input Supply Pin. Connect a minimum of 1µF

ceramic decoupling capacitor from this pin to ground

using short direct PCB traces.

SHDN (Pin 4): Logic Controlled Shutdown Input. There

is an internal 4M

Ω pull-down on this pin.

• SHDN = High: Normal operation

• SHDN = Low: Shutdown, quiescent current < 1µA

FB (Pin 5): Feedback Input to the gm Error Amplifier. Con-

nect resistor divider tap to this pin. The top of the divider

connects to the output capacitor, the bottom of the divider

connectstoGND.ReferringtotheBlockDiagram,theoutput

voltage can be adjusted from 1.6V to 5.25V by:

OUT =









1 195

•

VOUT(Pin6):Outputvoltagesenseanddrainoftheinternal

synchronous rectifier. PCB trace from VOUT to the output

filter capacitor (4.7µF minimum) should be as short and

wide as possible.

GND (Exposed Pad Pin 7): The Exposed Pad must be sol-

dered to the PCB ground plane. It serves as an additional

ground connection and as a means of conducting heat

away from the package.

Load Step Response (from Burst

Mode Operation)

Load Step Response

(Fixed Frequency)

LOAD

CURRENT

50mA/DIV

100µs/DIV

VIN = 1.2V

VOUT = 3.3V

50mA TO 100mA STEP

COUT = 10µF

3526 G21

VOUT

100mV/DIV

AC-COUPLED

LOAD

CURRENT

50mA/DIV

50µs/DIV

VIN = 1.2V

VOUT = 3.3V

5mA TO 100mA STEP

COUT = 10µF

3526 G22

VOUT

100mV/DIV

AC-COUPLED

Typical perFormance characTerisTics

elecTrical characTerisTics

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