Small Footprint 4V-38V Input Voltage Range Synchronous Step-Down DC/DC Controller

(click image to zoom by 2.9x)

Linear Technology Corporation announces the LTC3854, a tiny 2mm x 3mm DFN-12 packaged, wide input voltage range synchronous step-down switching DC/DC controller that drives all N-channel power MOSFET stages. The 4V to 38V input range addresses a wide variety of applications, including most intermediate bus voltages and battery chemistries. The strong on-board MOSFET gate drivers enable high power external MOSFETs to produce output currents up to 20A with output voltages ranging from 0.8V to 5.5V. This makes the LTC3854 ideal for point-of-load regulation requirements in datacom, telecom, industrial, Automotive, medical and multi-function printer applications.

A constant-frequency current mode architecture provides a fixed 400kHz operating frequency. The LTC3854 features an onboard 5V regulator, eliminating the need for a separate bias voltage to power the chip. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values, including all ceramic capacitor designs. Output current sensing measures the voltage drop across the output inductor (DCR) or an optional sense resistor. Current foldback limits MOSFET heat dissipation during short-circuit and overload conditions. In addition, the LTC3854 has adjustable soft-start to control the turn-on time and manage inrush current. Selectable continuous or discontinuous inductor current modes are available to safely power pre-biased loads. Anti-shoot-through protection prevents shoot-through current in the power MOSFETs. Operating up to 96% duty cycle, the LTC3854 has a very low dropout voltage for extending run times in battery-powered applications. The LTC3854 features a precision 0.8V reference with an accuracy of ±1% over the -40°C to 85°C operating temperature range.

The LTC3854 is available from stock with prices starting at $1.65 in 1000-piece quantities. For more information, visit www.linear.com.

Summary of Features: LTC3854

VIN Range: 4V to 38V

VOUT Range: 0.8V to 5.5V

Strong On-Board N-Channel MOSFET Drivers

On-Board 5V Regulator

Small 2mm x 3mm DFN-12 Package

Anti-Shoot Through Protection

Current Mode Control

Safely Powers Pre-Biased Loads

DCR or RSENSE Current Sense Options

Programmable Soft-Start

96% Maximum Duty Cycle

±1% Reference Voltage Accuracy over -40°C to +85°C

Synchronous Step-Down DC/DC Controller

Ltc3854

Click Photo for High-Res Image

Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, µModule® products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, Video/multimedia, industrial instrumentation, Security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and Military and space systems.

LT, LTC, LTM and µModule are registered trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.

Worldwide Contacts

North America and General Information

John Hamburger

Tel: (408) 432-1900 ext. 2419

jhamburger@linear.com

Tel: (408) 432 1900 ext. 2233

ddickinson@linear.com

China (PRC)

Tel: 852-2428-0303

flau@linear.com

Angela Ao

Tel: (8610)6522 8081

angela.ao@ebacomms.com

Alice Wang

Tel: + 886-2-28974705

alice@ezwire.com

Ralf Stegmann

Tel: +49 (0) 7131 9234-11

ralf@ezwire.com

Desiree Park

Tel: +82-2-565-6625

desiree@ezwire.com

UK & Scandinavia

Alan Timmins

Tel: +44-1-252-629937

a.timmins@ntlworld.com

Kazuto Takahashi

Tel: 81-3-5226-7291

ktakahashi@linear.com

Tel: +0422-47-5319

kasai@miacis.com

France

Tel: +33 1 4614 87 09

clotilde.zeller@zellercom.com