Product details

Topology Boost, Duty cycle (Max) (%) 45 Supply voltage (Max) (V) 40 UVLO thresholds on/off (V) 4/6 Features Adjustable Switching Frequency, Error Amplifier, Multi-topology Operating temperature range (C) 0 to 70 Rating Catalog Frequency (Max) (kHz) 300 Gate drive (Typ) (A) 0.2
Topology Boost, Duty cycle (Max) (%) 45 Supply voltage (Max) (V) 40 UVLO thresholds on/off (V) 4/6 Features Adjustable Switching Frequency, Error Amplifier, Multi-topology Operating temperature range (C) 0 to 70 Rating Catalog Frequency (Max) (kHz) 300 Gate drive (Typ) (A) 0.2
PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (D) 16 59 mm² 9.9 x 6
  • Complete PWM Power-Control Function
  • Totem-Pole Outputs for 200-mA Sink or Source Current
  • Output Control Selects Parallel or Push-Pull Operation
  • Internal Circuitry Prohibits Double Pulse at Either Output
  • Variable Dead-Time Provides Control Over Total Range
  • Internal Regulator Provides a Stable 5-V Reference Supply, Trimmed to 1% Tolerance
  • On-Board Output Current-Limiting Protection
  • Undervoltage Lockout for Low VCC Conditions
  • Separate Power and Signal Grounds
  • Complete PWM Power-Control Function
  • Totem-Pole Outputs for 200-mA Sink or Source Current
  • Output Control Selects Parallel or Push-Pull Operation
  • Internal Circuitry Prohibits Double Pulse at Either Output
  • Variable Dead-Time Provides Control Over Total Range
  • Internal Regulator Provides a Stable 5-V Reference Supply, Trimmed to 1% Tolerance
  • On-Board Output Current-Limiting Protection
  • Undervoltage Lockout for Low VCC Conditions
  • Separate Power and Signal Grounds

The TL598 incorporates all the functions required in the construction of pulse-width-modulated (PWM) controlled systems on a single chip. Designed primarily for power-supply control, the TL598 provides the systems engineer with the flexibility to tailor the power-supply control circuits to a specific application.

The TL598 contains two error amplifiers, an internal oscillator (externally adjustable), a dead-time control (DTC) comparator, a pulse-steering flip-flop, a 5-V precision reference, undervoltage lockout control, and output control circuits. Two totem-pole outputs provide exceptional rise- and fall-time performance for power FET control. The outputs share a common source supply and common power ground terminals, which allow system designers to eliminate errors caused by high current-induced voltage drops and common-mode noise.

The error amplifier has a common-mode voltage range of 0 V to VCC - 2 V. The DTC comparator has a fixed offset that prevents overlap of the outputs during push-pull operation. A synchronous multiple supply operation can be achieved by connecting RT to the reference output and providing a sawtooth input to CT.

The TL598 device provides an output control function to select either push-pull or parallel operation. Circuit architecture prevents either output from being pulsed twice during push-pull operation. The output frequency for push-pull applications is one-half the oscillator frequency (fo=1/2 RT CT). For single-ended applications: (fo=1/RT CT)

The TL598 incorporates all the functions required in the construction of pulse-width-modulated (PWM) controlled systems on a single chip. Designed primarily for power-supply control, the TL598 provides the systems engineer with the flexibility to tailor the power-supply control circuits to a specific application.

The TL598 contains two error amplifiers, an internal oscillator (externally adjustable), a dead-time control (DTC) comparator, a pulse-steering flip-flop, a 5-V precision reference, undervoltage lockout control, and output control circuits. Two totem-pole outputs provide exceptional rise- and fall-time performance for power FET control. The outputs share a common source supply and common power ground terminals, which allow system designers to eliminate errors caused by high current-induced voltage drops and common-mode noise.

The error amplifier has a common-mode voltage range of 0 V to VCC - 2 V. The DTC comparator has a fixed offset that prevents overlap of the outputs during push-pull operation. A synchronous multiple supply operation can be achieved by connecting RT to the reference output and providing a sawtooth input to CT.

The TL598 device provides an output control function to select either push-pull or parallel operation. Circuit architecture prevents either output from being pulsed twice during push-pull operation. The output frequency for push-pull applications is one-half the oscillator frequency (fo=1/2 RT CT). For single-ended applications: (fo=1/RT CT)

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Technical documentation

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Type Title Date
* Data sheet TL598 datasheet (Rev. D) 30 Oct 2003
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 12 Mar 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Understanding Boost Power Stages In Switchmode Power Supplies 04 Mar 1999
Application note Understanding Buck Power Stages In Switchmode Power Supplies 04 Mar 1999
Application note Designing Switch-Mode Power Supplies with the TL598 Application Report (Rev. B) 01 Jul 1992

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PDIP (N) 16 View options
SOIC (D) 16 View options

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