Datasheet

LM2738
V
IN
V
IN
EN
BOOST
SW
FB
GND
V
OUT
C3
L1
C1
C2
R1
R2
D1
D2
ON
OFF
LM2738
www.ti.com SNVS556B –APRIL 2008–REVISED APRIL 2013
LM2738 550kHz/1.6MHz 1.5A Step-Down DC-DC Switching Regulator
Check for Samples: LM2738
1
FEATURES
DESCRIPTION
The LM2738 regulator is a monolithic, high frequency,
2
• Space Saving WSON and MSOP-PowerPAD
PWM step-down DC/DC converter in an 8-pin WSON
Package
or 8-pin MSOP-PowerPAD package. It provides all
• 3.0V to 20V Input Voltage Range
the active functions for local DC/DC conversion with
• 0.8V to 18V Output Voltage Range
fast transient response and accurate regulation in the
smallest possible PCB area.
• 1.5A Output Current
With a minimum of external components, the LM2738
• 550kHz (LM2738Y) and 1.6MHz (LM2738X)
is easy to use. The ability to drive 1.5A loads with an
– Switching Frequencies
internal 250mΩ NMOS switch using state-of-the-art
• 250mΩ NMOS Switch
0.5µm BiCMOS technology results in the best power
• 400nA Shutdown Current
density available. Switching frequency is internally set
to 550kHz (LM2738Y) or 1.6MHz (LM2738X),
• 0.8V, 2% Internal Voltage Reference
allowing the use of extremely small surface mount
• Internal Soft-Start
inductors and chip capacitors. Even though the
• Current-Mode, PWM Operation
operating frequencies are very high, efficiencies up to
90% are easy to achieve. External enable is included,
• Thermal Shutdown
featuring an ultra-low stand-by current of 400nA. The
LM2738 utilizes current-mode control and internal
APPLICATIONS
compensation to provide high-performance regulation
• Local Point of Load Regulation
over a wide range of operating conditions. Additional
features include internal soft-start circuitry to reduce
• Core Power in HDDs
in-rush current, cycle-by-cycle current limit, thermal
• Set-Top Boxes
shutdown, and output over-voltage protection.
• Battery Powered Devices
• USB Powered Devices
• DSL Modems
TYPICAL APPLICATION CIRCUIT
Efficiency vs Load Current
V
IN
= 12V, V
OUT
= 3.3V
1
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PRODUCTION DATA information is current as of publication date.
Copyright © 2008–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.