LM2736_15 Datasheet, PDF (1/36 Pages) Texas Instruments – LM2736 Thin SOT 750 mA Load Step-Down DC-DC Regulator

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LM2736
SNVS316H – SEPTEMBER 2004 – REVISED DECEMBER 2014
LM2736 Thin SOT 750 mA Load Step-Down DC-DC Regulator
1 Features
•1 Thin SOT-6 Package
• 3.0 V to 18 V Input Voltage Range
• 1.25 V to 16 V Output Voltage Range
• 750 mA Output Current
• 550 kHz (LM2736Y) and 1.6 MHz (LM2736X)
Switching Frequencies
• 350 mΩ NMOS Switch
• 30 nA Shutdown Current
• 1.25 V, 2% Internal Voltage Reference
• Internal Soft-Start
• Current-Mode, PWM Operation
• WEBENCH^® Online Design Tool
• Thermal Shutdown
2 Applications
• Local Point of Load Regulation
• Core Power in HDDs
• Set-Top Boxes
• Battery Powered Devices
• USB Powered Devices
• DSL Modems
• Notebook Computers
3 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 750 mA loads with an
internal 350 mΩ NMOS switch using state-of-the-art
0.5 µm BiCMOS technology results in the best power
density available. The world class control circuitry
allows for on-times as low as 13 ns, thus supporting
exceptionally high frequency conversion over the
entire 3 V to 18 V input operating range down to the
minimum output voltage of 1.25 V. Switching
frequency is internally set to 550 kHz (LM2736Y) or
1.6 MHz (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 30 nA. 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
D2
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM2736
SOT (6)
2.90 mm x 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Efficiency vs. Load Current "X"
V_IN = 5 V, V_OUT = 3.3 V
VIN
C1
ON
OFF
VIN
BOOST
C3
SW
D1
EN
FB
GND
L1
VOUT
C2
R1
R2
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.