LM25011 - 42V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit

Datasheet	Packaging	Samples & Pricing	Eval. Boards	Reliability	Design Tools	Application Notes	Knowledge Base

Features

•	Input operating voltage range: 6V to 42V
•	Absolute maximum input rating: 45V
•	Integrated 2A N-Channel Buck Switch
•	Adjustable current limit
•	Adjustable output voltage from 2.51V
•	Minimum ripple voltage at V_OUT
•	Power Good output
•	Switching frequency adjustable to 2 MHz
•	Switching frequency remains nearly constant with load current and input voltage variations
•	Ultra-fast transient response
•	No loop compensation required
•	Stable operation with ceramic output capacitors
•	Adjustable Soft-Start timing
•	Thermal shutdown
•	Precision 2% feedback reference

General Description

Typical Application

click for larger image

Parameters Values

Output Current 2000 mA

Input Min Voltage 6 Volt

Input Max Voltage 42 Volt

Output Min 2.51 Volt

Output Max 40 Volt

Frequency Max 2000 kHz

On/Off Pin No

Error Flag Yes

SoftStart Yes

Sync Pin No

Inverting Yes

Flyback No

RegType Switching Regulator

Temperature Min -40 deg C

Temperature Max 125 deg C

Adjustable Output Yes

Adj Switch Frequency Yes

PWM Mode Constant On-Time

Topology Buck

Special Features No compensation req'd, ultra fast transient response, PGD output

Step-Down Yes

Multiple Output Capability No

Output Range 2.51V to 40V

Feedback Voltage 2.51 Volt

Regulator Family SIMPLE SWITCHER

Synchronous Rectification No

Quiescent Current 1.2 mA

Typical Performance

click for larger image

WEBENCH Live Simulation!

LM25011
6.00 <=	V in Lower V	<=	V in Upper V	<= 42.00
V out	2.51 <=		V	<= 40.00
I out			A	<= 2.00
Ambient Temperature			°C	<= 100
What are WEBENCH® tools?

Also Recommended

LM5005▲

2.5A, 7-75V Step-down Regulator

Additional Resources

Design Tools

Application Notes

Block Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM25011 42V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit	426 Kbytes	16-Oct-09	Download

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

Weeks

Qty

$US each

LM25011MY

MINI SOIC EXP PAD

NOPB

260

RoHS

N/A

Full production

N/A

1K+

$1.75

reel
of
1000

ZXTT
SVUB

6 weeks

N/A

LM25011MYX

MINI SOIC EXP PAD

NOPB

260

RoHS

N/A

Full production

N/A

1K+

$1.75

reel
of
3500

ZXTT
SVUB

6 weeks

N/A

LM25011MY-EVAL

Evaluation Board for the LM25011

Full production

N/A

CALL

N/A

8 weeks

N/A

General Description

The LM25011 Constant On-time Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying up to 2A of load current. This high voltage regulator contains an N-Channel Buck switch, a startup regulator, current limit detection, and internal ripple control. The constant on-time regulation principle requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load. The adjustable valley current limit detection results in a smooth transition from constant voltage to constant current mode when current limit is reached, without the use of current limit foldback. The PGD output indicates the output voltage has increased to within 5% of the expected regulation value. Additional features include: Low output ripple, VIN under-voltage lock-out, adjustable soft-start timing, thermal shutdown, gate drive pre-charge, gate drive under-voltage lock-out, and maximum duty cycle limit.

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM25011MY	ABCD5	0	5364	0	0	1626984	3	461661152
LM25011MYX	ABCD5	0	5364	0	0	1626984	3	461661152

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. 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.

Design Tools

Title	Size in Kbytes	Date
LM25011 Quick Start Calculator	205 Kbytes	2-Jun-2009	View

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

Application Notes

Title	Size in Kbytes	Date
AN-1965: Application Note 1965 LM25011 Evaluation Board	378 Kbytes	30-May-09	Download

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

More Application Notes

Title	Size in Kbytes	Date
AN-1431: Application Note 1431 LM25010 Evaluation Board	632 Kbytes	19-Dec-05	Download

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

[Information as of 7-Nov-2009]