TL1451A

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3.6V to 50V dual channel controller with Wide input voltage range

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Product details

Parameters

Vin (Min) (V) 3.6 Vin (Max) (V) 50 Vout (Min) (V) 1 Vout (Max) (V) 50 Regulated outputs (#) 2 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 500 Iq (Typ) (mA) 1.7 Features Synchronous Rectification Duty cycle (Max) (%) 100 Operating temperature range (C) -20 to 85, -40 to 125 Rating Automotive, Catalog open-in-new Find other Boost converters (integrated switch)

Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (D) 16 59 mm² 9.9 x 6 SOP (NS) 16 80 mm² 10.2 x 7.8 SSOP (DB) 16 48 mm² 6.2 x 7.8 TSSOP (PW) 16 22 mm² 4.4 x 5 open-in-new Find other Boost converters (integrated switch)

Features

  • Complete PWM Power Control Circuitry
  • Completely Synchronized Operation
  • Internal Undervoltage Lockout Protection
  • Wide Supply Voltage Range
  • Internal Short-Circuit Protection
  • Oscillator Frequency...500 kHz Max
  • Variable Dead Time Provides Control Over Total Range
  • Internal Regulator Provides a Stable 2.5-V Reference Supply
  • Available in Q-Temp Automotive
    HighRel Automotive Applications
    Configuration Control / Print Support
    Qualification to Automotive Standards
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Description

The TL1451A incorporates on a single monolithic chip all the functions required in the construction of two pulse-width-modulation (PWM) control circuits. Designed primarily for power-supply control, the TL1451A contains an on-chip 2.5-V regulator, two error amplifiers, an adjustable oscillator, two dead-time comparators, undervoltage lockout circuitry, and dual common-emitter output transistor circuits.

The uncommitted output transistors provide common-emitter output capability for each controller. The internal amplifiers exhibit a common-mode voltage range from 1.04 V to 1.45 V. The dead-time control (DTC) comparator has no offset unless externally altered and can provide 0% to 100% dead time. The on-chip oscillator can be operated by terminating RT and CT. During low VCC conditions, the undervoltage lockout control circuit feature locks the outputs off until the internal circuitry is operational.

The TL1451AC is characterized for operation from -20°C to 85°C. The TL1451AQ is characterized for operation from -40°C to 125°C. The TL1451AM is characterized for operation from -55°C to 125°C.

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Technical documentation

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Type Title Date
* Data sheet Dual Pulse-Width-Modulation Control Circuits datasheet (Rev. E) Mar. 13, 2002
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) Mar. 12, 2019
Application note Basic Calculation of a Boost Converter's Power Stage (Rev. C) Jan. 08, 2014
Application note Understanding Boost Power Stages In Switchmode Power Supplies Mar. 04, 1999
Application note Understanding Buck Power Stages In Switchmode Power Supplies Mar. 04, 1999

Design & development

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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.
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  • Features isolated topologies like Fly-Buck™, Fly-Buck-Boost, DCM and CCM Flyback
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CAD/CAE symbols

Package Pins Download
PDIP (N) 16 View options
SO (NS) 16 View options
SOIC (D) 16 View options
SSOP (DB) 16 View options
TSSOP (PW) 16 View options

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