LM2651 1.5A High Efficiency Switching Regulator | TI.com

LM2651 (ACTIVE) 1.5A High Efficiency Switching Regulator

 

Recommended alternative parts

  • LM20242  -  36V Vin 2A PWM Sync Buck Regulator
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  • LM2650  -  3A Integrated Synchronous Regulator W/ Adj Frequency And Sync Pin
  • LM2653  -  More Features Including Pgood Flag W/ Adjustable Delay
  • LM2852  -  2A Synch Buck Regulator For Low Voltage Applications
  • LM2854  -  4A Synch Buck Regulator For Low Voltage Applications
  • LM3100  -  36V 1.5A Synchronous Buck Regulator

Description

The LM2651 switching regulator provides high-efficiency power conversion over a 100:1 load range (1.5 A to 15 mA). This feature makes the LM2651 an ideal fit in battery-powered applications that demand long battery life in both run and standby modes.

Synchronous rectification is used to achieve up to 97% efficiency. At light loads, the LM2651 enters a low power hysteretic or sleep mode to maintain high efficiency. In many applications, the efficiency still exceeds 80% at 15-mA load. A shutdown pin is available to disable the LM2651 and reduce the supply current to less than 10 µA.

The LM2651 contains a patented current sensing circuitry for current mode control. This feature eliminates the external current sensing resistor required by other current-mode DC-DC converters.

The LM2651 has a 300-kHz fixed frequency internal oscillator. The high oscillator frequency allows the use of extremely small, low-profile components.

A programmable soft-start feature limits current surges from the input power supply at start-up and provides a simple means of sequencing multiple power supplies.

Other protection features include input undervoltage lockout, current limiting, and thermal shutdown.

Features

  • Ultrahigh Efficiency up to 97%
  • High-Efficiency Over a 1.5-A to 1.5-mA Load
    Range
  • 4-V to 14-V Input Voltage Range
  • 1.8-V, 2.5-V, 3.3-V, or ADJ Output Voltage
  • Internal MOSFET Switch With Low RDS(on) of
    75 mΩ
  • 300-kHz Fixed Frequency Internal Oscillator
  • 7-µA Shutdown Current
  • Patented Current Sensing for Current Mode
    Control
  • Input Undervoltage Lockout
  • Adjustable Soft-Start
  • Current Limit and Thermal Shutdown
  • 16-Pin TSSOP Package

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Parametrics

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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)
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)    
LM20323 Order now 4.5     36     0.8     32     3     1     500     500     2.3     Enable
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Current Mode     80     -40 to 125     Catalog     HTSSOP | 20     Converter     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)    
LM2653 Samples not available 4     14     1.5     5     1.5     1     255     345     1.7     Power Good     Voltage Mode     95     -40 to 125     Catalog     TSSOP | 16     Converter     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)    
LM2854 Order now 2.95     5.5     0.8     5     4     1     500     1000     1.7     Enable
Synchronous Rectification
Tracking    
Voltage Mode     100     -40 to 85     Catalog     HTSSOP | 16     Converter     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)    
LM3100 Order now 4.5     36     0.8     7     1.5     1     200     1000     1     Enable
Over Current Protection
Synchronous Rectification
Tracking    
COT with emulated ripple     94     -40 to 125     Catalog     HTSSOP | 20     Converter     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)