3 to 20 V input, 1 A, automotive step-down converter with light load efficiency


Product details


Vin (Min) (V) 3 Vin (Max) (V) 20 Vout (Min) (V) 0.8 Vout (Max) (V) 18 Iout (Max) (A) 1 Iq (Typ) (uA) 2100 Switching frequency (Min) (kHz) 400 Switching frequency (Max) (kHz) 1900 Features Enable, Light Load Efficiency, Over Current Protection Operating temperature range (C) -40 to 125 Rating Automotive Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

SOT-23-THN (DDC) 6 5 mm² 2.9 x 1.6 open-in-new Find other Buck converters (integrated switch)


  • AEC-Q100 Qualified for Automotive Applications:
    • Device Temperature Grade 1: -40°C to +125°C, TA
  • Thin SOT-6 Package
  • 3-V to 20-V Input Voltage Range
  • 0.8-V to 18-V Output Voltage Range
  • 1-A Output Current
  • 550-kHz (LM2734Y) and 1.6-MHz (LM2734X) Switching Frequencies
  • 300-mΩ NMOS Switch
  • 30-nA Shutdown Current
  • 0.8-V, 2% Internal Voltage Reference
  • Internal Soft Start
  • Current-Mode, PWM Operation
  • Thermal Shutdown
  • Create a Custom Design Using the LM2734-Q1 With WEBENCH® Power Designer

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The LM2734-Q1 regulator is a monolithic, high-frequency, PWM step-down DC/DC converter in a 6-pin Thin SOT package. The device provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area.

With a minimum of external components and online design support through WEBENCH, the LM2734-Q1 regulator is easy to use. The ability to drive 1-A loads with an internal 300-mΩ NMOS switch using state-of-the-art 0.5-µm BiCMOS technology results in the best power density available. The world-class control circuitry allows for on-times as low as 13 ns, thus supporting exceptionally high-frequency conversion over the entire 3-V to 20-V input operating range down to the minimum output voltage of 0.8 V. Switching frequency is internally set to 550 kHz (LM2734Y) or 1.6 MHz (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 standby current of 30 nA.

The LM2734-Q1 regulator uses 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 inrush current, pulse-by-pulse current limit, thermal shutdown, and output overvoltage protection.

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LM2734Z-Q1 ACTIVE 3 to 20 V input, 1 A, high frequency automotive step-down converter with light load efficiency 3-MHz version

Technical documentation

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Type Title Date
* Data sheet LM2734-Q1 Thin SOT 1-A Load Step-Down DC/DC Regulator datasheet Sep. 25, 2018
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
User guide AN-1350 LM2734 Evaluation Board (Rev. A) Apr. 24, 2013
User guide High-IF Sub-sampling Receiver Subsystem User Guide Jan. 27, 2012
Application note Advanced Topics in Powering FPGAs Mar. 22, 2007
Application note Power Management Considerations for FPGAs and ASICs Mar. 22, 2007

Design & development

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Hardware development

document-generic User guide

LM2734 Thin SOT-23 1A Load Step-Down DC-DC Regulator

  • Thin SOT-23-6 package
  • 3.0V to 20V input voltage range
  • 0.8V to 18V output voltage range
  • 1A output current
  • 550kHz (LM2734Y) and 1.6MHz (LM2736X) switching frequencies
  • 300m ohm NMOS switch
  • 30nA shutdown current
  • 0.8V, 2% internal voltage reference
  • Internal soft-start
  • Current-Mode, PWM operation
  • WEBENCH online (...)

Design tools & simulation

SNVM098A.ZIP (51 KB) - PSpice Model
SNVM100.ZIP (195 KB) - PSpice Model
SNVM136A.ZIP (51 KB) - PSpice Model
SNVM149.ZIP (201 KB) - PSpice Model
SNVM834.ZIP (1 KB) - PSpice Model
SNVM835.ZIP (2 KB) - PSpice Model
SNVM836.ZIP (1 KB) - PSpice Model
SNVM837.ZIP (2 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
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SOT-23-THIN (DDC) 6 View options

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