LM2736YMKX Datasheet, PDF (1/31 Pages) Texas Instruments – LM2736 Thin SOT 750mA Load Step-Down DC-DC Regulator

LM2736
www.ti.com
SNVS316F – SEPTEMBER 2004 – REVISED APRIL 2013
LM2736 Thin SOT 750mA Load Step-Down DC-DC Regulator
Check for Samples: LM2736
FEATURES
1
•23 Thin SOT-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
SOT 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
Efficiency vs Load Current "X"
V_IN = 5V, V_OUT = 3.3V
V_IN
C1
ON
OFF
D2
V_IN
BOOST
C3
SW
D1
EN
FB
GND
L1
V_OUT
C2
R1
R2
1
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 registered trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
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 © 2004–2013, Texas Instruments Incorporated