LM2734 3V to 20V Input, 1A Step-Down Converter with Light Load Efficiency | TI.com

LM2734 (ACTIVE)

3V to 20V Input, 1A Step-Down Converter with Light Load Efficiency

 

Recommended alternative parts

  • LM2651  -  1.5A Synchronous Buck Regulator
  • LM2734-Q1  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Auto-Qualified Version
  • LM27341  -  1.5A, 2MHz Fsw, Frequency Sync
  • LM27341-Q1  -  1.5A, 2MHz Fsw, Frequency Sync, Auto-Qualified Version
  • LM2734Z  -  3MHz Version
  • LM2734Z-Q1  -  3MHz Auto-Qualified Version
  • LM2738  -  1.5A Version

Description

The LM2734 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 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 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.

Features

  • 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 With WEBENCH® Power Designer

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WEBENCH® Designer LM2734

  Min   Max Range
Vin  V 3.0 to 20.0V
Vout  V 0.8 to 18V
Iout  A ≤ 1A
Ambient Temp  °C -40 to 125°C

Parametrics

Compare all products in Buck converters (integrated switch) Email Download to Excel
Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Package size: mm2:W x L (PKG)
LM2734 Order now 3     20     0.8     18     1     1     400     1900     2.1     Enable
Light Load Efficiency
Pre-Bias Start-Up    
Current Mode     96     -40 to 125     Catalog     SOT-23-THIN | 6     Converter     6SOT-23-THIN: 8 mm2: 2.8 x 2.9 (SOT-23-THIN | 6)    
LM2651 Order now 4     14     3.3     13     1.5     1     255     345     1.6     UVLO Adjustable     Voltage Mode     95     -40 to 125     Catalog     TSSOP | 16     Converter     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)    
LM27341 Order now 3     20     1     18     1.5     1     1750     2300     2.4     Enable
Light Load Efficiency    
Current Mode     93     -40 to 125     Catalog     MSOP-PowerPAD | 10
WSON | 10    
Converter     10MSOP-PowerPAD: 15 mm2: 4.9 x 3 (MSOP-PowerPAD | 10)
See datasheet (WSON)    
LM2734Z Order now 3     20     0.8     18     1     1     2200     3600     1.5     Enable
Light Load Efficiency
Pre-Bias Start-Up    
Current Mode     85     -40 to 125     Catalog     SOT-23-THIN | 6
WSON | 6    
Converter     6SOT-23-THIN: 8 mm2: 2.8 x 2.9 (SOT-23-THIN | 6)
See datasheet (WSON)    
LM2736 Order now 3     18     1.25     16     0.75     1     400     1900     1.5     Enable
Light Load Efficiency
Pre-Bias Start-Up    
Current Mode     96     -40 to 125     Catalog     SOT-23-THIN | 6     Converter