1.2V to 14V input voltage, 1A load current, step-up DC-DC


Product details


Vin (Min) (V) 1.2 Vin (Max) (V) 14 Vout (Min) (V) 1.24 Vout (Max) (V) 14 Switch current limit (Typ) (A) 2.85 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 2000 Switching frequency (Max) (kHz) 2000 Iq (Typ) (mA) 0.08 Features Enable Duty cycle (Max) (%) 80 Operating temperature range (C) -40 to 85 Type Converter Rating Catalog open-in-new Find other Boost converters (integrated switch)

Package | Pins | Size

VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Boost converters (integrated switch)


  • 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
open-in-new Find other Boost converters (integrated switch)


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.

open-in-new Find other Boost converters (integrated switch)
Similar products you might be interested in
open-in-new Compare products
Same functionality and pinout but is not an equivalent to the compared device:
LM2623 ACTIVE 0.8V to 14V input voltage, 2A load current, step-up DC-DC Operates with input voltages as low as 0.8 V.
Similar but not functionally equivalent to the compared device:
LM27313 ACTIVE 1.6 MHz boost converter with 30V Internal FET switch in SOT-23 Fixed frequency with smaller package.
LM2733 ACTIVE 0.6/1.6 MHz Boost Converters With 40V Internal FET Switch in SOT-23 1-A, 40-V Switch boost regulator in SOT-23.
LM3224 ACTIVE 615kHz/1.25MHz Step-up PWM DC/DC Converter Wider switch voltage, fixed frequency.
TPS61170 ACTIVE 1.2A Switch, 38V High Voltage Boost Converter in 2x2mm QFN Package 1.2 A Switch, high voltage boost converter in 2 x 2 mm QFN package.

Technical documentation

= Featured
No results found. Please clear your search and try again. View all 2
Type Title Date
* Datasheet LM2621 Low Input Voltage, Step-Up DC-DC Converter datasheet (Rev. D) Dec. 03, 2015
More literature Die D/S LM2621 MWC Low Input Voltage, Step-Up Dc-Dc Sep. 20, 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development


Low Input Voltage, Step-Up DC-DC

  • 1MHz Switching frequency minimizes board size
  • 0.1uA shutdown current maximizes battery life
  • Start-up at 1.1V; operational down to 0.65V
  • Step-up or SEPIC applications
  • MSOP-8 package - half the size of 8-Pin SO


Design tools & simulation

Fly-Buck and Flyback Topology Selector
FLYBUCK-FLYBACK-DESIGN-CALC This tool helps a power supply engineer to select the right isolated DC-DC topology based on the specifications. Depending on the topology chosen, the calculator also recommends the right IC for the design.
  • Features isolated topologies like Fly-Buck™, Fly-Buck-Boost, DCM and CCM Flyback
  • Capability to design up to 6 isolated outputs
  • Recommends ICs for desired application design
  • Incorporates loop compensation in designs
  • Compares efficiency, external component count and transformer currents for every topology (...)

CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​


Power Tips: Layout for a Boost Power Stage

This video shows a simplified schematic and PCB layout for a boost converter

Posted: 21-Jan-2016
Duration: 04:31

Related videos