LV2843DDCR.pdf_lv2843数据手册

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100

0.1 1 10 100 1000

Efficiency (%)

Output Current (mA)

C001

LV2843

Cboot

Cout

SHDN

VIN

Cin

VIN

GND

TI Confidential — NDA Restrictions

LV2843

SNVSA23A –JULY 2014–REVISED JANUARY 2015

LV2843 High-Efficiency Wide Input-Voltage-Range Buck Regulator

1 Features 3 Description

The LV2843 is a PWM DC/DC buck (step-down)

• Input Range 4 V to 40 V with 45 V Transients

regulator. With a wide input range from 4 V to 40 V, it

• 0.7 MHz Switching Frequency

is suitable for a wide range of applications from

• Ultra High Efficiency for Light Load with ECO

industrial to automotive. An ultra-low 1 µA shut down

Mode

current prolongs battery life. Operating frequency is

fixed at 0.7 MHz allowing the use of small external

• Low Dropout Operation

components while still being able to have low output

• Output Current up to 1 A

ripple voltage. Soft-start and compensation circuits

• Precision Enable Input

are implemented internally, and these allow the

device to be used with minimum external

• Overcurrent Protection

components.

• Internal Compensation

The LV2843 is optimized for up to 1 A load current. It

• Internal Soft-Start

has a 0.765 V nominal feedback voltage.

• Small Overall Solution Size (TSOT-6L Package)

The device has built-in protection features such as

pulse-by-pulse current limit, thermal sensing and

2 Applications

shutdown due to excessive power dissipation. The

• Power Meter

LV2843 is available in a low profile TSOT-6L package

• Collector

(2.9 mm × 1.6 mm × 0.85mm).

• Concentrator

Device Information

(1)

• Industrial Distributed Power Applications

PART NUMBER PACKAGE BODY SIZE (NOM)

LV2843 TSOT-6L 2.9 mm x 1.6 mm

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

4 Simplified Schematic

Efficiency vs. Current

(ƒ

= 0.7 MHz, V

= 12 V, V

OUT

= 3.3 V)

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

TI Confidential — NDA Restrictions

LV2843

SNVSA23A –JULY 2014 –REVISED JANUARY 2015

www.ti.com

Table of Contents

8.2 Functional Block Diagram ......................................... 7

1 Features.................................................................. 1

8.3 Feature Description................................................... 7

2 Applications ........................................................... 1

9 Application and Implementation ........................ 10

3 Description ............................................................. 1

9.1 Application Information............................................ 10

4 Simplified Schematic............................................. 1

9.2 Typical Applications ............................................... 10

5 Revision History..................................................... 2

10 Power Supply Recommendations ..................... 14

6 Pin Configuration................................................... 3

11 Layout................................................................... 14

7 Specifications......................................................... 4

11.1 Layout Guidelines ................................................. 14

7.1 Absolute Maximum Ratings ...................................... 4

11.2 Layout Example .................................................... 15

7.2 Handling Ratings ...................................................... 4

12 Device and Documentation Support ................. 16

7.3 Recommended Operating Conditions....................... 4

12.1 Trademarks........................................................... 16

7.4 Thermal Information.................................................. 4

12.2 Electrostatic Discharge Caution............................ 16

7.5 Electrical Characteristics........................................... 5

12.3 Glossary................................................................ 16

7.6 Typical Characteristics.............................................. 6

13 Mechanical, Packaging, and Orderable

8 Detailed Description.............................................. 7

Information ........................................................... 16

8.1 Overview ................................................................... 7

13.1 Package Option Addendum.................................. 17

5 Revision History

Changes from Original (July 2014) to Revision A Page

• Changed from Product Preview to Production Data and still a custom document for the China customers ......................... 1

Product Folder Links: LV2843

TI Confidential — NDA Restrictions

LV2843

SNVSA23A –JULY 2014 –REVISED JANUARY 2015

www.ti.com

7 Specifications

7.1 Absolute Maximum Ratings

Over operating free-air temperature range (unless otherwise noted)

(1)

MIN MAX UNIT

to GND -0.3 45

SHDN to GND -0.3 45

Input Voltages V

FB to GND -0.3 7

CB to SW -0.3 7

SW to GND -1 45

Output Voltages V

SW to GND less than 30ns transients -2 45

Operating junction temperature -40 150 °C

(1) Stresses at or beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress

ratings only and functional operation of the device at these or any other conditions beyond those indicated under “recommended

operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

7.2 Handling Ratings

MIN MAX UNIT

stg

Storage temperature range -55 165 °C

Human body model (HBM), all pins except CB PIN

(1)

1000

(ESD)

Electrostatic discharge V

Charged device model (CDM), all pins

(2)

500

(1) JEDEC document JEP155 states that 500V HBM allows safe manufacturing with a standard ESD control process, CB PIN passes 500V

test.

(2) JEDEC document JEP157 states that 250V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditions

Over operating free-air temperature range (unless otherwise noted)

MIN MAX UNIT

Vin 4 40

CB 46

Buck regulator CB to SW 6

SW -0.7 40

FB 0 5

Control SHDN 0 40

Temperature Operating junction temperature, T

-40 125 °C

7.4 Thermal Information

LV2843

THERMAL METRIC

(1)

SOT (DDC) UNIT

6 PINS

θJA

Junction-to-ambient thermal resistance 102

θJC(top)

Junction-to-case (top) thermal resistance 36.9 °C/W

Junction-to-board characterization parameter 28.4

(1) All numbers apply for packages soldered directly onto a 3" x 3" PC board with 2 oz. copper on 4 layers in still air in accordance to

JEDEC standards. Thermal resistance varies greatly with layout, copper thickness, number of layers in PCB, power distribution, number

of thermal vias, board size, ambient temperature, and air flow.

Product Folder Links: LV2843

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