RoHS Compliance Information	Size in Kbytes	Date
LM27341/LM27342/LM27341Q/LM27342Q 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization	749 Kbytes	22-Oct-09	Download

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

Qty

$US each

LM27341QMY

MINI SOIC EXP PAD

10

NOPB

3

260

RoHS

N/A

Full production

N/A

CALL

reel of N/A

ZXTT SSJB

6 weeks

N/A

LM27341QMYX

MINI SOIC EXP PAD

10

NOPB

3

260

RoHS

N/A

Full production

N/A

CALL

reel of N/A

ZXTT SSJB

6 weeks

N/A

LM27341MY

MINI SOIC EXP PAD

10

NOPB

3

260

RoHS

N/A

Full production

N/A

1K+

$1.76

reel of 1000

ZXTT SSCB

6 weeks

N/A

LM27341MYX

MINI SOIC EXP PAD

10

NOPB

3

260

RoHS

N/A

Full production

N/A

1K+

$1.76

reel of 3500

ZXTT SSCB

6 weeks

N/A

LM27341SD

LLP

10

NOPB

1

260

RoHS

N/A

Full production

N/A

1K+

$1.76

reel of 1000

ZXYTT L231B

6 weeks

N/A

LM27341SDX

LLP

10

NOPB

1

260

RoHS

N/A

Full production

N/A

1K+

$1.76

reel of 4500

ZXYTT L231B

6 weeks

N/A

General Description

The LM27341 and LM27342 regulators are monolithic, high frequency, PWM step-down DC-DC converters in 10-pin LLP and 10-pin eMSOP packages. They contain 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 LM27341 and LM27342 are easy to use. The ability to drive 1.5A or 2A loads respectively, with an internal 150 mΩ NMOS switch results in the best power density available. The world-class control circuitry allows for on-times as low as 65 ns, thus supporting exceptionally high frequency conversion. Switching frequency is internally set to 2 MHz and synchronizable from 1 to 2.35 MHz, which allows the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequency is very high, efficiencies up to 90% are easy to achieve. External shutdown is included featuring an ultra-low shutdown current of 70 nA. The LM27341and LM27342 utilize peak 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.

Application Notes

Title	Size in Kbytes	Date
AN-1197: Application Note 1197 Selecting Inductors for Buck Converters	371 Kbytes	1-May-04	Download
AN-1197 (Japanese): Application Note 1197 Selecting Inductors for Buck Converters	304 Kbytes
AN-1197 (Chinese): Application Note 1197 Selecting Inductors for Buck Converters	515 Kbytes
AN-1187: Application Note 1187 Leadless Leadframe Package (LLP)	2065 Kbytes	11-Oct-07	Download
AN-1187 (Japanese): Application Note 1187 Leadless Leadframe Package (LLP)	1878 Kbytes
AN-1187 (Chinese): Application Note 1187 Leadless Leadframe Package (LLP)	5580 Kbytes
AN-1520: Application Note 1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages	2176 Kbytes	7-Sep-06	Download
AN-1520 (Chinese): Application Note 1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages	849 Kbytes
AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines	229 Kbytes	1-May-04	Download
AN-1229 (Japanese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines	304 Kbytes
AN-1229 (Chinese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines	668 Kbytes
AN-1929: Application Note 1929 LM27342 Demonstration Board	507 Kbytes	20-Nov-08	Download

More Application Notes

Title	Size in Kbytes	Date
AN-1973: Application Note 1973 Benefits and Challenges of High-Frequency Regulators	348 Kbytes	25-Jun-09	Download
AN-1822: Application Note 1822 LMH6733 High Definition Video Transmission Over CAT5	691 Kbytes	14-Jan-09	Download