LM2831 - High Frequency 1.5A Load - Step-Down DC-DC Regulator

	LM2831 - High Frequency 1.5A Load - Step-Down DC-DC Regulator

Datasheet	Packaging	Samples & Pricing	Eval. Boards	Reliability	Knowledge Base

Features

•	Space Saving SOT23-5 Package
•	Input voltage range of 3.0V to 5.5V
•	Output voltage range of 0.6V to 4.5V
•	1.5A output current
•	High Switching Frequencies 1.6MHz (LM2831X) 0.55MHz (LM2831Y) 3.0MHz (LM2831Z)
•	130m PMOS switch
•	0.6V, 2% Internal Voltage Reference
•	Internal soft-start
•	Current mode, PWM operation
•	Thermal Shutdown
•	Over voltage protection

General Description

The LM2831 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 5 pin SOT23 and a 6 Pin LLP package. More...

Applications

•	Local 5V to Vcore Step-Down Converters
•	Core Power in HDDs
•	Set-Top Boxes
•	USB Powered Devices
•	DSL Modems

Typical Application

click for larger image

Parametric Table expand

Parametric Table collapse

Output Current 1500 mA

Input Min Voltage 3 Volt

Input Max Voltage 5.5 Volt

Output Min 0.6 Volt

Output Max 4.5 Volt

Frequency Min 1600, 3000, 550 kHz

Frequency Max 1600, 3000, 550 kHz

Output Current 1500 mA

Input Min Voltage 3 Volt

Input Max Voltage 5.5 Volt

Output Min 0.6 Volt

Output Max 4.5 Volt

Frequency Min 1600, 3000, 550 kHz

Frequency Max 1600, 3000, 550 kHz

Efficiency (peak) 93 %

On/Off Pin Yes

Error Flag No

SoftStart Yes

Sync Pin No

Inverting No

Flyback No

RegType Switching Regulator

Temperature Min -40 deg C

Temperature Max 125 deg C

Adjustable Output Yes

Adj Switch Frequency No

PWM Mode Current

Topology Buck

Special Features Internal compensation

Step-Down Yes

Multiple Output Capability No

Output Power Undefined Watt

Output Voltage Undefined Volt

Output Range 0.6V to 4.5V

Switching Frequency 1600, 3000, 550 kHz

Feedback Voltage Undefined Volt

Regulator Family Undefined

AEC Q-100 Automotive Grade Undefined

Automotive Selection Guide Yes

Synchronous Rectification No

View Using Catalog

Typical Performance

*click for larger image

WEBENCH Live Simulation!

LM2831X WEBENCH® Custom Design/Analyze/Build It/Test It
3.00 <=	V in Lower V	<=	V in Upper V	<= 5.50
V out	0.60 <=		V	<= 4.50
I out			A	<= 1.50
Ambient Temperature			°C	<= 100
What is WEBENCH®?

Also Recommended

LM2830	1.0A Version
LM2832	2.0A Version

Block Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM2831 High Frequency 1.5A Load - Step-Down DC-DC Regulator	896 Kbytes	2-Aug-06	View Online Download
LM2831 High Frequency 1.5A Load - Step-Down DC-DC Regulator (Japanese)	805 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Qty

Qty

$US each

LM2831XMF EVAL

High Frequency 1.5A Load - Step-Down DC-DC Regulator

Full production

N/A

1+

$30.00

1

8 weeks

N/A

LM2831ZMF EVAL

High Frequency 1.5A Load - Step-Down DC-DC Regulator

Full production

N/A

1+

$37.50

1

8 weeks

N/A

LM2831XMF

5

NOPB

1

260

Full production

N/A

Samples

1K+

$1.65

reel
of
1000

6 weeks

1000

LM2831YMF

5

NOPB

1

260

Full production

N/A

Samples

1K+

$1.35

reel
of
1000

6 weeks

1000

LM2831ZMF

5

NOPB

1

260

Full production

N/A

Samples

1K+

$1.79

reel
of
1000

6 weeks

15000

LM2831XMFX

5

NOPB

1

260

Full production

N/A

1K+

$1.65

reel
of
3000

6 weeks

5000

LM2831YMFX

5

NOPB

1

260

Full production

N/A

1K+

$1.35

reel
of
3000

6 weeks

N/A

LM2831ZMFX

5

NOPB

1

260

Full production

N/A

1K+

$1.79

reel
of
3000

6 weeks

N/A

LM2831YMF EVAL

High Frequency 1.5A Load - Step-Down DC-DC Regulator

Full production

N/A

1+

$30.00

1

8 weeks

N/A

LM2831XSD

6

NOPB

1

260

Full production

N/A

Samples

1K+

$1.65

reel
of
1000

6 weeks

2000

LM2831YSD

6

NOPB

1

260

Full production

N/A

Samples

1K+

$1.35

reel
of
1000

6 weeks

2000

LM2831ZSD

6

NOPB

1

260

Full production

N/A

Samples

1K+

$1.79

reel
of
1000

6 weeks

2000

LM2831XSDX

6

NOPB

1

260

Full production

N/A

1K+

$1.65

reel
of
4500

6 weeks

N/A

LM2831YSDX

6

NOPB

1

260

Full production

N/A

1K+

$1.35

reel
of
4500

6 weeks

N/A

LM2831ZSDX

6

NOPB

1

260

Full production

N/A

1K+

$1.79

reel
of
4500

6 weeks

N/A

General Description

The LM2831 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 5 pin SOT23 and a 6 Pin LLP package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components, the LM2831 is easy to use. The ability to drive 1.5A loads with an internal 130 m PMOS switch using state-of-the-art 0.5 µm BiCMOS technology results in the best power density available. The world-class control circuitry allows on-times as low as 30ns, thus supporting exceptionally high frequency conversion over the entire 3V to 5.5V input operating range down to the minimum output voltage of 0.6V. Switching frequency is internally set to 550 kHz, 1.6 MHz, or 3.0 MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is high, efficiencies up to 93% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 30 nA. The LM2831 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output over-voltage protection.

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM *	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2831XMF	PVIP050	0	8430	0	0	495000	8	140457601
LM2831XMFX	PVIP050	0	8430	0	0	495000	8	140457601
LM2831XSD	PVIP050	0	8430	0	0	495000	8	140457601
LM2831XSDX	PVIP050	0	8430	0	0	495000	8	140457601
LM2831YMF	PVIP050	0	8430	0	0	495000	8	140457601
LM2831YMFX	PVIP050	0	8430	0	0	495000	8	140457601
LM2831YSD	PVIP050	0	8430	0	0	495000	8	140457601
LM2831YSDX	PVIP050	0	8430	0	0	495000	8	140457601
LM2831ZMF	PVIP050	0	8430	0	0	495000	8	140457601
LM2831ZMFX	PVIP050	0	8430	0	0	495000	8	140457601
LM2831ZSD	PVIP050	0	8430	0	0	495000	8	140457601
LM2831ZSDX	PVIP050	0	8430	0	0	495000	8	140457601

Note: The Early Failure Rates were calculated as point estimates. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

[Information as of 7-Jan-2009]