1 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

2 Applications

• Switch mode power supplies (SMPS)

• DC-DC converters

• Power modules

• Industrial PSU

• Battery operated PSU

• Traction inverter bias supply

• OBC and DC/DC converter isolated bias supply

• HVAC compressor module isolated power supply

3 Description

The UC284xL-Q1 control device is an automotivegrade

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 cycleby-

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.