LT3434EFEPBF Linear Technology Corporation, LT3434EFEPBF Datasheet

LT3434EFEPBF

Manufacturer Part Number

LT3434EFEPBF

Description

TSSOP16

Manufacturer

Linear Technology Corporation

Datasheets

1.LT3434EFEPBF.pdf (24 pages)

2.LT3434EFEPBF.pdf (24 pages)

Specifications of LT3434EFEPBF

Date_code

07+

Current page: 1 of 24
Download datasheet (408Kb)

FEATURES

■

APPLICATIO S

■

TYPICAL APPLICATIO

trademarks are the property of their respective owners. Burst Mode is a registered

trademark of Linear Technology Corporation. *Protected by U.S. Patents including

6498466. **See Burst Mode Operation section for conditions.

4700pF

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

200kHz Switching Frequency

Saturating Switch Design: 0.1Ω

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

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

High Voltage Power Conversion

14V and 42V Automotive Systems

Industrial Power Systems

Distributed Power Systems

Battery-Powered Systems

10k

14V to 3.3V Step-Down Converter with

1µF

100µA No Load Quiescent Current

4.7µF

100V

CER

470pF

SHDN

SYNC

GND

Operation: 100µA Quiescent Current**

LT3434

BOOST

PGFB

BIAS

0.1µF

0.68µF

27pF

< 1µA

30MQ100

33µH

4148

165k

100k

3434 TA01

100µF

6.3V

TANT

3.3V

OUT

Step-Down Switching Regulator

with 100µA Quiescent Current

150

125

100

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 integrated in a new high

voltage 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 LT3434 is available in a 16-pin TSSOP package with

Exposed Pad leadframe for low thermal resistance.

Supply Current vs

Input Voltage

INPUT VOLTAGE (V)

High Voltage 3A, 200kHz

3434 is a 200kHz monolithic buck switching

OUT

= 3.3V

3434 TA02a

100

0.0001

Efficiency and Power Loss

EFFICIENCY

= 12V

0.001

vs Load Current

LOAD CURRENT (A)

OUT

0.01

= 3.3V

OUT

pin to the output

TYPICAL POWER

LOSS

= 5V

0.1

LT3434

3434 TA02b

0.1

0.001

0.01

3434fb

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