Product
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UC2843L-Q1
  • UC2843L-Q1
  • UC2843L-Q1
  • UC2843L-Q1

UC2843L-Q1

ACTIVE

Automotive, 36V, 1A, 500KHz current mode PWM controller with 8.4V and 7.6V UVLO 100% duty cycle

Texas Instruments UC2843L-Q1 Product Info

1 April 2026 3

Parameters

Topology

Boost, Buck, Buck boost, Flyback, Forward

Control mode

Peak current mode

Features

Adjustable switching frequency, Current limiting, Dead time control, Error amplifier, Fixed frequency, Multi-topology

Duty cycle (max) (%)

100

Package

SOIC (D)-8-29.4 mm² 4.9 x 6

Features

  • Improved output driver and lower operating/startup current from UC284xAQ/UC284xA-Q1
  • Optimized for off-line and DC-DC converters
  • Low start-up current (<0.5mA)
  • Trimmed oscillator discharge current
  • Automatic feedforward compensation
  • Pulse-by-pulse current limiting
  • Enhanced load response characteristics
  • Undervoltage lockout with hysteresis
  • Double pulse suppression
  • High-current totem pole output
  • Internally-trimmed bandgap reference
  • Up to 500kHz operation
  • Functional Safety-Capable
    • Document available to aid functional safety system design
  • AEC-Q100 qualified with the following results
    • Device temperature grade 1: –40°C to 125°C
    • Device HBM classification level 2: ±2kV
    • Device CDM classification level C6: ≥1000 V
  • Improved output driver and lower operating/startup current from UC284xAQ/UC284xA-Q1
  • Optimized for off-line and DC-DC converters
  • Low start-up current (<0.5mA)
  • Trimmed oscillator discharge current
  • Automatic feedforward compensation
  • Pulse-by-pulse current limiting
  • Enhanced load response characteristics
  • Undervoltage lockout with hysteresis
  • Double pulse suppression
  • High-current totem pole output
  • Internally-trimmed bandgap reference
  • Up to 500kHz operation
  • Functional Safety-Capable
    • Document available to aid functional safety system design
  • AEC-Q100 qualified with the following results
    • Device temperature grade 1: –40°C to 125°C
    • Device HBM classification level 2: ±2kV
    • Device CDM classification level C6: ≥1000 V

Description

The UC284xL-Q1 control device is an automotive-grade pin-for-pin compatible improved version of the UC284xAQ/UC284xA-Q1 families. Providing the necessary features to control current-mode or switched-mode power supplies, this device provides improved features: higher VCC range at 36V, lower start-up current at 0.25mA, tighter operating current tolerance at 15mA max, and faster response on cycle-by-cycle current protection at 100ns. Output driver of UC284xL-Q1 is improved with shorter rise and fall time at 75ns max to reduce switching loss, and stronger driver capabilities with lower output low level farther from the FETs threshold voltage.

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