National Semiconductor LM2734Z LM2734ZQ Thin SOT23 1A Load Step-Down DC-DC Regulator
Summary
The LM2734Z/LM2734ZQ is a high-efficiency, monolithic step-down DC-DC regulator designed for compact point-of-load conversion in portable and automotive electronics. This regulator provides stable 1A output current from input voltages spanning 3V to 20V within ultra-small thin SOT23 packages. The manual details the regulator’s advanced functions, including ultra-low standby current (30nA), precise regulation, and excellent thermal performance. It is ideal for electrical engineers designing battery-powered devices, USB systems, or automotive circuits requiring reliable power management in restricted space.
Page 1 Text Content
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June 12, 2008
LM2734Z/LM2734ZQ Thin SOT23 1A Load Step-Down DC-DC Regulator General Description Features The LM2734Z regulator is a monolithic, high frequency, PWM Thin SOT23-6 package, or 6 lead LLP package step-down DC/DC converter assembled in a 6-pin Thin
3.0V to 20V input voltage range
SOT23 and LLP non pull back package. It provides all the
0.8V to 18V output voltage range
active functions to provide local DC/DC conversion with fast
1A output current
transient response and accurate regulation in the smallest
possible PCB area. 3MHz switching frequency With a minimum of external components and online design 300mΩ NMOS switch
support through WEBENCH®™, the LM2734Z is easy to use. 30n A shutdown current The ability to drive 1A loads with an internal 300mΩ NMOS
0.8V, 2% internal voltage reference
switch using state-of-the-art 0.5µm Bi CMOS technology re-
Internal soft-start
sults in the best power density available. The world class
control circuitry allows for on-times as low as 13ns, thus sup- Current-Mode, PWM operation
porting exceptionally high frequency conversion over the en- Thermal shutdown tire 3V to 20V input operating range down to the minimum
LM2734ZQ is AEC-Q100 Grade 1 qualified and is
output voltage of 0.8V. Switching frequency is internally set
manufactured on an Automotive Grade Flow
to 3MHz, allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating fre-
Applications
quency is very high, efficiencies up to 85% are easy to
achieve. External shutdown is included, featuring an ultra-low DSL Modems
stand-by current of 30n A. The LM2734Z utilizes current-mode Local Point of Load Regulation control and internal compensation to provide high-perfor-
Battery Powered Devices
mance regulation over a wide range of operating conditions.
USB Powered Devices
Additional features include internal soft-start circuitry to re-
Automotive
duce inrush current, pulse-by-pulse current limit, thermal shutdown, and output over-voltage protection.
Typical Application Circuit
Efficiency vs Load Current VIN = 5V, VOUT = 3.3V
WEBENCH™ is a trademark of Transim.
© 2008 National Semiconductor Corporation www.national.com
Page Summary Contents For National Semiconductor LM2734Z LM2734ZQ Thin SOT23 1A Load Step-Down DC-DC Regulator
Manual Details
| Brand | National |
|---|---|
| Pages | 20 |
| File Size | 452.41 KB |
| Published | June 17, 2026 |
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Frequently Asked Questions
How do I set the desired output voltage?
Set it by connecting an external resistor divider to the FB (Feedback) pin.
What are the key protection features of this regulator?
It includes internal soft-start, thermal shutdown, pulse-by-pulse current limit, and over-voltage protection.
Is the device compatible with automotive applications?
Yes, the LM2734ZQ is AEC-Q100 Grade 1 qualified for use in automotive systems.
What is the acceptable input voltage range?
The operational input voltage range is specified as 3V to 20V.