LM2621 (ACTIVE)

1.2-V to 14-V Input Voltage, Step-Up DC-DC

1.2-V to 14-V Input Voltage, Step-Up DC-DC - LM2621
 

Recommended alternative parts

  • LM2623  -  Operates With Input Voltages As Low As 0.8V
  • TPS61170  -  1.2A Switch, High Voltage Boost Converter in 2x2mm QFN Package
  • LM27313  -  Fixed Frequency , Smaller Package
  • LM2733  -  1A 40V Switch Boost Regulator In SOT-23
  • LM3224  -  Wider Switch Voltage , Fixed Frequency

Description

The LM2621 is a high efficiency, step-up DC-DC switching regulator for battery-powered and low input voltage systems. It accepts an input voltage between 1.2 V and 14 V and converts it into a regulated output voltage. The output voltage can be adjusted between 1.24 V and 14 V. It has an internal 0.17-Ω N-Channel MOSFET power switch. Efficiencies up to 90% are achievable using the LM2621.

The high switching frequency (adjustable up to 2 MHz) of the LM2621 allows for tiny surface mount inductors and capacitors. Because of the unique constant-duty-cycle gated oscillator topology very high efficiencies are realized over a wide load range. The supply current is reduced to 80 µA because of the BiCMOS process technology. In the shutdown mode, the supply current is less than 2.5 µA.

The LM2621 is available in a VSSOP-8 package. This package uses half the board area of a standard 8-pin SOIC and has a height of just 1.09 mm.

Features

  • Small VSSOP8 Package (Half the Footprint of
    Standard 8-Pin SOIC Package)
  • 1.09-mm Package Height
  • Up to 2-MHz Switching Frequency
  • 1.2-V to 14-V Input Voltage
  • 1.24-V to 14-V Adjustable Output Voltage
  • Up to 1A Load Current
  • 0.17-Ω Internal MOSFET
  • Up to 90% Regulator Efficiency
  • 80-µA Typical Operating Current
  • < 2.5-µA Specified Supply Current In Shutdown

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Parametrics Compare all products in Boost Converter (Integrated Switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switch Current Limit (Typ) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Features
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
LM2621 LM2623 LM27313 LM2733 TLV61046A TPS61040 TPS61087 TPS61170
1.2    0.8    2.7    2.7    1.8    1.8    2.5    3   
14    14    14    14    5.5    6    6    18   
1.24    1.24    4    3    3.3    1.8    3    3   
14    14    28    40    28    28    18.5    38   
2.85    2.85    1.25    1.5    0.9    0.4    4    1.2   
1    1    1    1    1      1    1   
  300    1150    400    850      900    1000   
2000    2000    1900    1850    1250    1000    1500    1200   
0.08    0.08    2.1    1.1    0.11    0.028    0.075    2.3   
Enable    Enable    Enable
Light Load Efficiency   
Enable
Light Load Efficiency   
Enable
Light Load Efficiency
Load Disconnect   
Enable    Enable
Power Good   
Enable
Light Load Efficiency   
  90    88    96      88    90    93   
-40 to 85    -40 to 85    -40 to 125    -40 to 125    -40 to 125    -40 to 85    -40 to 85    -40 to 85   
VSSOP    VSSOP
WSON   
SOT-23    SOT-23    SOT-23    SOT-23
SOT-23-THIN
WSON   
VSON
WSON   
WSON   
New! Interactive Design
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WEBENCH® Designer LM2621

  Min   Max Range
Vin  V 1.2 to 14.0V
Vout  V 2.5 to 14V
Iout  A ≤ 2.85A
Ambient Temp  °C -40 to 125°C


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