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LM2738YMY Datasheet(PDF) 1 Page - Texas Instruments

No. de pieza LM2738YMY
Descripción Electrónicos  1.5A Step-Down DC-DC Switching Regulator
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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LM2738YMY Datasheet(HTML) 1 Page - Texas Instruments

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LM2738
VIN
VIN
EN
BOOST
SW
FB
GND
VOUT
C3
L1
C1
C2
R1
R2
D1
D2
ON
OFF
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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.
LM2738
SNVS556C – APRIL 2008 – REVISED JANUARY 2016
LM2738 550-kHz/1.6-MHz 1.5-A Step-Down DC-DC Switching Regulator
1
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-m
Ω 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
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-m
Ω 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.
Device Information(1)
PART
NUMBER
PACKAGE
BODY SIZE (NOM)
LM2738
WSON (8)
3.00 mm × 3.00 mm
MSOP-PowerPAD (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Circuit
Efficiency vs Load Current
VIN = 12 V, VOUT = 3.3 V


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