LTC3426ES6 Просмотр технического описания (PDF) - Analog Devices

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LTC3426ES6

1.2MHz Step-Up DC/DC Converter in SOT-23

Analog Devices 

LTC3426

PIN FUNCTIONS

SW (Pin 1): Switch Pin. Connect inductor between SW

and VIN. A Schottky diode is connected between SW and

VOUT. Keep these PCB trace lengths as short and wide

as possible to reduce EMI and voltage overshoot. If the

inductor current falls to zero, an internal 100Ω antiringing

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

output capacitor(s).

FB (Pin 3): Feedback Input to the gm Error Amplifier. Con-

nect resistor divider tap to this pin. The output voltage can

be adjusted from 2.5V to 5V by:

VOUT

=

1.22

•





1+

R1

R2 

SHDN (Pin 4): Logic Controlled Shutdown Input.

SHDN = High: Normal free running operation

SHDN = Low: Shutdown, quiescent current < 1µA

Typically, SHDN should be connected to VIN through a

1M pull-up resistor.

VOUT (Pin 5): Output Voltage Sense Input. The NMOS switch

gate drive is derived from the greater of VOUT and VIN.

VIN (Pin 6): Input Supply. Must be locally bypassed.

BLOCK DIAGRAM

1.22V

REFERENCE

+

A1

–

3

FB

VOUT

R1 (EXTERNAL)

FB

R2 (EXTERNAL)

VOUT

VIN

COMPARATOR

5

6

–

RC

A2

CC

+

PWM LOGIC

AND DRIVER

Σ

RAMP

GENERATOR

SHDN

4

SHUTDOWN AND

SOFT-START

1.2MHz

OSCILLATOR

SW

1

0.02Ω

2

3426 F01

GND

3426fb

4

For more information www.linear.com/LTC3426

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