LT3976EMSE#PBF datasheet, PDF - EEWORLD Datasheet

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LT3976EMSE#PBF: DescriptionConv DC-DC 4.3V to 40V Step Down Single-Out 16V 5A Automotive 16-Pin MSOP EP Tube; File Size385KB，28 Pages; ManufacturerADI; Websitehttps://www.analog.com

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LT3976EMSE#PBF Overview

Conv DC-DC 4.3V to 40V Step Down Single-Out 16V 5A Automotive 16-Pin MSOP EP Tube

LT3976EMSE#PBF Parametric

Parameter Name	Attribute value
EU restricts the use of certain hazardous substances	Compliant
ECCN (US)	EAR99
Part Status	Active
Type	Step Down
Output Type	Adjustable
Switching Frequency (kHz)	200 to 2000
Switching Regulator	Yes
Number of Outputs	1
Output Voltage (V)	16(Max)
Maximum Output Current (A)	5
Minimum Input Voltage (V)	4.3
Maximum Input Voltage (V)	40
Operating Supply Voltage (V)	4.3 to 40
Typical Switch Current (A)	10
Typical Quiescent Current (uA)	1.6
Line Regulation	0.01%/V
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	125
Supplier Temperature Grade	Extended
Packaging	Tube
Pin Count	16
Standard Package Name	SOP
Supplier Package	MSOP EP
Mounting	Surface Mount
Package Height	0.86
Package Length	4.04
Package Width	3
PCB changed	16
Lead Shape	Gull-wing

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LT3976

40V, 5A, 2MHz Step-Down

Switching Regulator with

3.3µA Quiescent Current

FeaTures

DescripTion

The

3976

is an adjustable frequency monolithic buck

switching regulator that accepts a wide input voltage range

up to 40V. Low quiescent current design consumes only

3.3µA of supply current while regulating with no load. Low

ripple Burst Mode operation maintains high efficiency at

low output currents while keeping the output ripple below

15mV in a typical application. The LT3976 can supply up

to 5A of load current and has current limit foldback to

limit power dissipation during short-circuit. A low dropout

voltage of 500mV is maintained when the input voltage

drops below the programmed output voltage, such as

during automotive cold crank.

An internally compensated current mode topology is used

for fast transient response and good loop stability. A high

efficiency 75mΩ switch is included on the die along with a

boost Schottky diode. An accurate 1.02V threshold enable

pin can be driven directly from a microcontroller or used

as a programmable undervoltage lockout. A capacitor on

the SS pin provides a controlled inrush current (soft-start).

A power good flag signals when V

OUT

reaches 91.6% of

the programmed output voltage. The LT3976 is available

in small 16-lead MSOP and 24-lead 3mm × 5mm QFN

packages with exposed pad for low thermal resistance.

Ultralow Quiescent Current:

3.3µA I

at 12V

to 3.3V

OUT

Low Ripple Burst Mode

Operation

Output Ripple < 15mV

P-P

Wide Input Range: Operation from 4.3V to 40V

5A Maximum Output Current

Excellent Start-Up and Dropout Performance

Adjustable Switching Frequency: 200kHz to 2MHz

Synchronizable Between 250kHz to 2MHz

Accurate Programmable Undervoltage Lockout

Low Shutdown Current: I

= 700nA

Power Good Flag

Soft-Start Capability

Thermal Shutdown Protection

Current Limit Foldback with Soft-Start Override

Saturating Switch Design: 75mΩ On-Resistance

Small, Thermally Enhanced 16-Lead MSOP and

24-Lead 3mm × 5mm QFN Packages

Automotive Battery Regulation

Portable Products

Industrial Supplies

applicaTions

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

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

Typical applicaTion

3.3V Step-Down Converter

4.3V TO 40V

OFF ON

10µF

LT3976

10nF

SYNC

130k

f = 400kHz

OUT

GND

BOOST

INPUT CURRENT (µA)

No-Load Supply Current

IN REGULATION

OUT

= 3.3V

15 20 25 30

INPUT VOLTAGE (V)

0.47µF

PDS540

3.3µH

470pF

10pF

576k

3976 TA01a

OUT

3.3V

47µF

1210

×2

3976 G05

3976f

For more information

www.linear.com/3976

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