LM2736_14 Datasheet, PDF (1/27 Pages) Texas Instruments – Thin SOT23 750mA Load Step-Down DC-DC Regulator

LM2736
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SNVS316E – SEPTEMBER 2004 – REVISED SEPTEMBER 2011
LM2736 Thin SOT23 750mA Load Step-Down DC-DC Regulator
Check for Samples: LM2736
FEATURES
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•23 Thin SOT23-6 package
• 3.0V to 18V input voltage range
• 1.25V to 16V output voltage range
• 750mA output current
• 550kHz (LM2736Y) and 1.6MHz (LM2736X)
– switching frequencies
• 350mΩ NMOS switch
• 30nA shutdown current
• 1.25V, 2% internal voltage reference
• Internal soft-start
• Current-Mode, PWM operation
• WEBENCH®™ online design tool
• Thermal shutdown
APPLICATIONS
• Local Point of Load Regulation
• Core Power in HDDs
• Set-Top Boxes
• Battery Powered Devices
• USB Powered Devices
• DSL Modems
• Notebook Computers
DESCRIPTION
The LM2736 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 6-pin Thin SOT23
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 and online design support through WEBENCH®™, the LM2736 is easy
to use. The ability to drive 750mA loads with an internal 350mΩ NMOS switch using state-of-the-art 0.5µm
BiCMOS technology results in the best power density available. The world class control circuitry allows for on-
times as low as 13ns, thus supporting exceptionally high frequency conversion over the entire 3V to 18V input
operating range down to the minimum output voltage of 1.25V. Switching frequency is internally set to 550kHz
(LM2736Y) or 1.6MHz (LM2736X), allowing the use of extremely small surface mount inductors and chip
capacitors. Even though the operating frequencies are very high, efficiencies up to 90% are easy to achieve.
External shutdown is included, featuring an ultra-low stand-by current of 30nA. The LM2736 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.
Typical Application Circuit
V_IN
C1
ON
OFF
D2
V_IN
BOOST
C3
SW
D1
EN
FB
GND
L1
V_OUT
C2
R1
R2
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
WEBENCH® is a trademark of Texas Instruments, Inc..
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2011, Texas Instruments Incorporated