LT3980IMSE-TRPBF 查看數據表（PDF） - Linear Technology

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LT3980IMSE-TRPBF

58V, 2A, 2.4MHz Step-Down Switching Regulator with 85µA Quiescent Current

Linear Technology 

LT3980

58V, 2A, 2.4MHz

Step-Down Switching Regulator

with 85µA Quiescent Current

Features

■ Wide Input Range: Operation from 3.6V to 58V

■ Overvoltage Lockout Protects Circuits Through 80V

Transients

■ 2A Maximum Output Current

■ Low Ripple (<15mVP-P) Burst Mode® Operation:

IQ = 85µA at 12VIN to 3.3VOUT

■ Adjustable Switching Frequency: 100kHz to 2.4MHz

■ Low Shutdown Current: IQ < 1µA

■ Catch Diode Current Sense Protects Circuit Through

Short-Circuit and Input Overvoltage

■ Synchronizable Between 250kHz to 2MHz

■ Power Good Flag

■ Saturating Switch Design: 200mΩ On-Resistance

■ Thermal Protection

■ Soft-Start Capability

■ Small 16-Pin Thermally Enhanced MSOP and

3mm × 4mm DFN Packages

Applications

■ Automotive Battery Regulation

■ Distributed Supply Regulation

■ Industrial Supplies

■ Wall Transformer Regulation

Description

The LT®3980 is an adjustable frequency (100kHz to

2.4MHz) monolithic buck switching regulator that accepts

input voltages up to 58V (80V transient). A high efficiency

200mΩ switch is included on the die along with a boost

Schottky diode and the necessary oscillator, control, and

logic circuitry. Current mode topology is used for fast

transient response and good loop stability. Catch diode

current sense (DA pin) protects the circuit during input

voltage transients even when a high switching frequency

is used. Low ripple Burst Mode operation maintains high

efficiency at low output currents while keeping output

ripple below 15mV in a typical application. In addition, the

LT3980 can further enhance low output current efficiency

by drawing bias current from the output when VOUT is

above 3V. Shutdown reduces input supply current to less

than 1µA while a resistor and capacitor on the RUN/SS

pin provide a controlled output voltage ramp (soft-start).

A power good flag signals when VOUT reaches 91% of

the programmed output voltage. The LT3980 is available

in 16-pin MSOP and 3mm × 4mm DFN packages with

exposed pads for low thermal resistance.

L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

Typical Application

5V Step-Down Converter

VIN

6.5V TO 58V

TRANSIENT

TO 80V

VIN

BD

OFF ON

RUN/SS

BOOST

4.75k

10µF

VC

LT3980

SW

RT

1nF

PG

DA

97.6k

SYNC

GND

FB

VOUT

5V

2A

0.47µF 10µH

22pF

536k

100k

47µF

3980 TA01

For more information www.linear.com/LT3980

Efficiency, VOUT = 5V

95

90

VIN = 12V

85

VIN = 24V

80

VIN = 48V

75

70

65

60

55 f = 400kHz

D = DIODES, INC. SBR3U100LP

50

0

0.5

1

1.5

ILOAD (A)

2

3980 TA01b

3980fa

1

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