LM2738_16 Datasheet, PDF (1/40 Pages) Texas Instruments – 1.5A Step-Down DC-DC Switching Regulator

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LM2738
SNVS556C – APRIL 2008 – REVISED JANUARY 2016
LM2738 550-kHz/1.6-MHz 1.5-A Step-Down DC-DC Switching Regulator
1 Features
•1 Space-Saving WSON and MSOP-PowerPAD™
Packages
• 3-V to 20-V Input Voltage Range
• 0.8-V to 18-V Output Voltage Range
• 1.5-A Output Current
• 550-kHz (LM2738Y) and 1.6-MHz (LM2738X)
Switching Frequencies
• 250-mΩ NMOS Switch
• 400-nA Shutdown Current
• 0.8-V, 2% Internal Voltage Reference
• Internal Soft-Start
• Current-Mode, PWM Operation
• Thermal Shutdown
2 Applications
• Local Point of Load Regulation
• Core Power in HDDs
• Set-Top Boxes
• Battery Powered Devices
• USB Powered Devices
• DSL Modems
Typical Application Circuit
VIN
C1
ON
OFF
VIN
BOOST
C3
SW
LM2738
D1
EN
FB
GND
D2
L1
R1
R2
VOUT
C2
3 Description
The LM2738 regulator is a monolithic, high-
frequency, PWM step-down DC-DC converter in an 8-
pin WSON or 8-pin MSOP-PowerPAD package. It
provides all the active functions for local DC-DC
conversion with fast transient response and accurate
regulation in the smallest possible PCB area.
With a minimum of external components, the LM2738
is easy to use. The ability to drive 1.5-A loads with an
internal 250-mΩ NMOS switch using state-of-the-art
0.5-µm BiCMOS technology results in the best power
density available. Switching frequency is internally set
to 550 kHz (LM2738Y) or 1.6 MHz (LM2738X),
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 enable is included,
featuring an ultralow standby current of 400 nA. The
LM2738 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
in-rush current, cycle-by-cycle current limit, thermal
shutdown, and output over-voltage protection.
PART
NUMBER
LM2738
Device Information⁽¹⁾
PACKAGE
BODY SIZE (NOM)
WSON (8)
MSOP-PowerPAD (8)
3.00 mm × 3.00 mm
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Efficiency vs Load Current
V_IN = 12 V, V_OUT = 3.3 V
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.