LTC3535 datasheet(7/16 Pages) LINER

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LTC3535

3535fa

PIN FUNCTIONS

VOUT1 (Pin 1): Output Voltage Sense and Drain of the

Internal Synchronous Rectifier for Channel 1. PCB trace

length from VOUT1 to the output filter capacitor (4.7µF

minimum) should be as short and wide as possible.

SW1 (Pin 2): Switch Pin for Channel 1. Connect inductor

between SW1 and VIN1. Keep PCB trace lengths as short

and wide as possible to reduce EMI. If the inductor current

fallstozero,orSHDN1islow,aninternalanti-ringingswitch

is connected from SW1 to VIN1 to minimize EMI.

GND (Pins 3, 6, Exposed Pad Pin 13): Signal and Power

Ground. Provide a short direct PCB path between GND

and the (–) side of the input and output capacitors. The

exposed pad must be soldered to the PCB ground plane.

It serves as another ground connection and as a means

of conducting heat away from the die.

VOUT2 (Pin 4): Output Voltage Sense and Drain of the

Internal Synchronous Rectifier for Channel 2. PCB trace

length from VOUT2 to the output filter capacitor (4.7µF

minimum) should be as short and wide as possible.

SW2 (Pin 5): Switch Pin for Channel 2. Connect inductor

between SW2 and VIN2. Keep PCB trace lengths as short

and wide as possible to reduce EMI. If the inductor current

fallstozero,orSHDN2islow,aninternalanti-ringingswitch

is connected from SW2 to VIN2 to minimize EMI.

VIN2 (Pin 7): Battery Input Voltage for Channel 2. Connect

a minimum of 1µF ceramic decoupling capacitor from this

pin to ground.

SHDN2(Pin8):LogicControlledShutdownInputforChan-

nel 2. There is an internal 4MΩ pull-down on this pin.

SHDN = High: Normal operation.

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

FB2 (Pin 9): Feedback Input to the gm Error Amplifier of

Channel 2. Connect resistor divider tap to this pin. The

output voltage can be adjusted from 1.5V to 5.25V by:

VOUT = 1.195V × [1 +(R4/R3)]

VIN1(Pin10):BatteryInputVoltageforChannel1.Connect

a minimum of 1µF ceramic decoupling capacitor from this

pin to ground.

SHDN1(Pin11):LogicControlledShutdownInputforChan-

nel 1. There is an internal 4MΩ pull-down on this pin.

SHDN = High: Normal operation.

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

FB1 (Pin 12): Feedback Input to the gm Error Amplifier

of Channel 1. Connect resistor divider tap to this pin. The

output voltage can be adjusted from 1.5V to 5.25V by:

VOUT = 1.195V × [1 +(R2/R1)].

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