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AC/DC & DC/DC converters (integrated FET)

LM2621

ACTIVE

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

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Data sheet

LM2621

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Boost Switch current limit (typ) (A) 2.85 Vin (max) (V) 14 Vin (min) (V) 1.2 Vout (max) (V) 14 Vout (min) (V) 1.24 Features Enable, Nonsynchronous rectification Switching frequency (min) (kHz) 2000 Switching frequency (max) (kHz) 300 Operating temperature range (°C) -40 to 85 Iq (typ) (µA) 80 Duty cycle (max) (%) 80 Type Converter
Rating Catalog Topology Boost Switch current limit (typ) (A) 2.85 Vin (max) (V) 14 Vin (min) (V) 1.2 Vout (max) (V) 14 Vout (min) (V) 1.24 Features Enable, Nonsynchronous rectification Switching frequency (min) (kHz) 2000 Switching frequency (max) (kHz) 300 Operating temperature range (°C) -40 to 85 Iq (typ) (µA) 80 Duty cycle (max) (%) 80 Type Converter
VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • 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
  • 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

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.

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.
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Technical documentation

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Type Title Date
* Data sheet LM2621 Low Input Voltage, Step-Up DC-DC Converter datasheet (Rev. D) PDF | HTML 03 Dec 2015
More literature Die D/S LM2621 MWC Low Input Voltage, Step-Up Dc-Dc 20 Sep 2012

Design & development

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

Evaluation board

LM2621EVAL — Low Input Voltage, Step-Up DC-DC Evaluation Module

Low Input Voltage, Step-Up DC-DC

Not available on TI.com
Calculation tool

FLYBUCK-FLYBACK-DESIGN-CALC — Flybuck / Flyback Calculator

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.

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
  • LM3017 — High Efficiency Low-Side Controller with True Shutdown
  • LM3478 — 2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller
  • LM3478Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 10-µA shutdown current
  • LM3481 — 2.97V to 48V High-Efficiency Controller for Boost, SEPIC and Flyback
  • LM3481-Q1 — 2.97-V to 48-V high-efficiency controller for boost, SEPIC and flyback, AEC-Q100 qualified
  • LM3488 — 2.97V to 40V Wide Vin Low-Side N-Channel Controller for Switching Regulators
  • LM3488Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 5-µA shutdown current
  • LM3524D — 40V, 0.2A 350KHz PWM controller
  • LM3578A — 2-V to 40-VIN switching regulators in buck, boost, terminal, depending upon the application
  • LM5020 — 13-100V Wide Vin, Current Mode PWM Boost, Flyback, Sepic Controller
  • LM5022 — 6-60V Wide Vin, current mode boost, SEPIC and Flyback controller
  • TL1451 — Dual Pulse-Width-Modulation Control Circuit
  • TL1451A — 3.6V to 50V dual channel controller with Wide input voltage range
  • TL1451A-EP — Enhanced Product Dual Pulse-Width-Modulation Control Circuits
  • TL1451A-Q1 — 3.6-V to 50-V dual-channel PWM controller, AEC-Q100 qualified
  • TL5001 — PWM Controller with wide input range, with ±5% tolerance on reference, operation –20°C to 85°C
  • TL5001A — PWM Controller with wide input range, with ±3% tolerance on reference, operation –20°C to 85°C
  • TL5001A-Q1 — PWM Controller with wide input range, with ±3% tolerance on reference, operation –20°C to 85°C
  • TL5001M — PWM Controller with wide input range, with ±5% tolerance on reference, operation –55°C to 125°C
  • TPS40210-Q1 — 4.5-V to 52-V wide input range current mode boost controller with 700-mV reference voltage
  • TPS40211-Q1 — 4.5-V to 52-V wide input range current mode boost controller with 260-mV reference voltage
  • TPS43000 — Multi-Topology (buck, boost, sepic) High Frequency DC/DC Controller
  • TPS55010 — 2.95V To 6V Input, 2W, Isolated DC/DC Converter with Integrated FETS
  • UC2572 — Negative output Flyback pulse width modulator
AC/DC & DC/DC converters (integrated FET)
  • LM25017 — 7.5-48V Wide Vin, 650mA Constant On-Time Synchronous Buck Regulator
  • LM25018 — 7.5-48V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator
  • LM25019 — 7.5-48V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator
  • LM2577 — 3.5-V to 40-V, 3-A low component count step-up regulator
  • LM2585 — 4-V to 40-V, 3-A step-up wide VIN flyback regulator
  • LM2586 — 4-V to 40-V, 3-A step-up wide VIN flyback regulator with frequency synchronization
  • LM2587 — 4V to 40V, 5A Step-Up Wide Vin Flyback Regulator
  • LM2588 — 4-V to 40-V, 5-A step-up wide VIN flyback regulator with frequency synchronization
  • LM2621 — 1.2V to 14V input voltage, 1A load current, step-up DC-DC
  • LM2623 — 0.8V to 14V input voltage, 2A load current, step-up DC-DC
  • LM2623-Q1 — 0.8-V to 14-V input voltage, 2-A load current, step-up DC/DC, AEC-Q100 qualified
  • LM2735 — 520kHz/1.6MHz space efficient boost and SEPIC DC-DC regulator
  • LM2735-Q1 — 520-kHz, 1.6-MHz space efficient boost and SEPIC DC/DC regulator, AEC-Q100 qualified
  • LM34925 — 7.5-100V Wide Vin, 100mA Integrated Secondary Bias Regulator for Isolated DC/DC Converters
  • LM34926 — 7.5-100V Wide Vin, 300mA Integrated Secondary Bias Regulator for Isolated DC/DC Converters
  • LM34927 — 7.5-100V Wide Vin, 600mA Integrated Secondary Bias Regulator for Isolated DC/DC Converters
  • LM5000 — 3.1-40V Wide Vin, 2A Current Mode Non-Synchronous Boost Regulator
  • LM5001 — 3.1-75V Wide Vin, 1A Current Mode Non-Synchronous Switch Mode Regulator
  • LM5001-Q1 — 3.1-V to 75-V wide VIN, 1-A current mode non-synchronous switch mode regulator
  • LM5002 — 3.1-75V Wide Vin, 0.5A Current Mode Boost, Flyback, Sepic Converter
  • LM5015 — 4.25-75V, Monolithic Two-Switch Forward DC-DC Regulator
  • LM5017 — 7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator
  • LM5018 — 7.5-100V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator
  • LM5019 — 7.5-100V Wide Vin, 100mA Constant On-Time Synchronous Buck Regulator
  • LM5160 — LM5160 wide input 65V, 2A synchronous buck/Fly-Buck™ converter
  • LM5160-Q1 — Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter
  • LM5160A — LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter
  • LM5161 — Wide Input 4.5-V to 100-V, 1-A Synchronous Buck / Fly-Buck Converter
  • LM78S40 — 1.5A Adjustable Step Up, Step Down or Inverting Regulator
  • TPS55340 — 5-A, 40-V, wide VIN boost, flyback, & SEPIC converter
  • TPS55340-EP — Enhanced integrated, 5-A, 40-V wide input range boost/SEPIC/flyback DC/DC regulator
  • TPS55340-Q1 — Integrated, 5-A 40-V wide input range boost/SEPIC/flyback DC/DC regulator, AEC-Q100 qualified
  • TPS61175 — 3-A ,40V High Voltage Boost Converter with Soft-start and Programmable Switching Frequency
  • TPS61175-Q1 — 3-A, 40-V high voltage boost converter with soft-start and programmable switching frequency
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VSSOP (DGK) 8 Ultra Librarian
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