LT3435 LINER [Linear Technology], LT3435 Datasheet

LT3435

Manufacturer Part Number

LT3435

Description

Manufacturer

LINER [Linear Technology]

Datasheet

1.LT3435.pdf (24 pages)

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FEATURES

TYPICAL APPLICATIO

■

Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks

are the property of their respective owners. *Protected by U.S. Patents including 6498466

**See Burst Mode Operation section for conditions.

APPLICATIO S

■

4700pF

, LTC and LT are registered trademarks of Linear Technology Corporation.

Wide Input Range: 3.3V to 60V

3A Peak Switch Current

Burst Mode

Low Shutdown Current: I

Power Good Flag with Programmable Threshold

Load Dump Protection to 60V

500kHz Switching Frequency

Saturating Switch Design: 0.1Ω On-Resistance

Peak Switch Current Maintained Over

Full Duty Cycle Range*

1.25V Feedback Reference Voltage

Easily Synchronizable

Soft-Start Capability

Small 16-Pin Thermally Enhanced TSSOP Package

High Voltage Power Conversion

14V and 42V Automotive Systems

Industrial Power Systems

Distributed Power Systems

Battery-Powered Systems

USB Powered Systems

10k

14V to 3.3V Step-Down Converter with

1µF

100µA No Load Quiescent Current

4.7µF

100V

CER

470pF

Operation: 100µA Quiescent Current**

SHDN

SYNC

GND

LT3435

BOOST

PGFB

BIAS

0.1µF

0.33µF

27pF

< 1µA

B360A

15µH

165k

100k

4148

3435 TA01

100µF

10V

TANT

3.3V

OUT

Step-Down Switching Regulator

150

125

100

with 100µA Quiescent Current

Supply Current vs Input Voltage

DESCRIPTIO

The LT

regulator that accepts input voltages up to 60V. A high

efficiency 3A, 0.1Ω switch is included on the die along with

all the necessary oscillator, control and logic circuitry.

Current mode topology is used for fast transient response

and good loop stability.

Innovative design techniques along with a new high volt-

age process achieve high efficiency over a wide input

range. Efficiency is maintained over a wide output current

range by employing Burst Mode operation at low currents,

utilizing the output to bias the internal circuitry, and by

using a supply boost capacitor to fully saturate the power

switch. Patented circuitry maintains peak switch current

over the full duty cycle range.* Shutdown reduces input

supply current to less than 1µA. External synchronization

can be implemented by driving the SYNC pin with logic-level

inputs. A single capacitor from the C

provides a controlled output voltage ramp (soft-start). The

device also has a power good flag with a programmable

threshold and time-out and thermal shutdown protection.

The LT3435 is available in a 16-pin TSSOP package with an

exposed pad leadframe for low thermal resistance.

INPUT VOLTAGE (V)

High Voltage 3A, 500kHz

3435 is a 500kHz monolithic buck switching

OUT

= 25°C

= 3.3V

3435 TA03

100

0.0001

Efficiency and Power Loss

OUT

= 12V

= 5V

0.001

OUT

vs Load Current

EFFICIENCY

LOAD CURRENT (A)

= 3.3V

0.01

pin to the output

0.1

TYPICAL

POWER LOSS

LT3435

3435 TA02

0.1

0.01

0.001

3435fa

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