LM2734XMKX National Semiconductor, LM2734XMKX Datasheet
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LM2734XMKX
Manufacturer Part Number
LM2734XMKX
Description
Thin SOT23 1A Load Step-Down DC-DC Regulator
Manufacturer
National Semiconductor
Datasheet
1.LM2734XMKX.pdf
(22 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM2734XMKX
Manufacturer:
NS国半/TI
Quantity:
20 000
© 2004 National Semiconductor Corporation
LM2734
Thin SOT23 1A Load Step-Down DC-DC Regulator
General Description
The LM2734 regulator is a monolithic, high frequency, PWM
step-down DC/DC converter in a 6-pin Thin SOT23 package.
It provides all the active functions to provide local DC/DC
conversion with fast transient response and accurate regu-
lation in the smallest possible PCB area.
With a minimum of external components and online design
support through WEBENCH
The ability to drive 1A loads with an internal 300mΩ NMOS
switch using state-of-the-art 0.5µm BiCMOS technology re-
sults 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 20V input operating range down to the minimum
output voltage of 0.8V. Switching frequency is internally set
to 550kHz (LM2734Y) or 1.6MHz (LM2734X), 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 LM2734 utilizes current-mode control and in-
ternal compensation to provide high-performance regulation
over a wide range of operating conditions. Additional fea-
tures include internal soft-start circuitry to reduce inrush
current, pulse-by-pulse current limit, thermal shutdown, and
output over-voltage protection.
Typical Application Circuit
WEBENCH
™
is a trademark of Transim.
™
, the LM2734 is easy to use.
DS201023
20102301
Features
n Thin SOT23-6 package
n 3.0V to 20V input voltage range
n 0.8V to 18V output voltage range
n 1A output current
n 550kHz (LM2734Y) and 1.6MHz (LM2734X)
n 300mΩ NMOS switch
n 30nA shutdown current
n 0.8V, 2% internal voltage reference
n Internal soft-start
n Current-Mode, PWM operation
n WEBENCH online design tool
Applications
n Local Point of Load Regulation
n Core Power in HDDs
n Set-Top Boxes
n Battery Powered Devices
n USB Powered Devices
n DSL Modems
n Notebook Computers
switching frequencies
Efficiency vs Load Current
V
IN
= 5V, V
OUT
= 3.3V
20102345
October 2004
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