Description

The MIC38C43BMTR is a fixed frequency, high-performance, current-mode PWM controller. It is a pin-compatible replacement for the UC3842/3843/3844/3845(A) devices but offers several improvements. The controller features fast output rise and fall times of 40ns and 30ns respectively. With a temperature range of -40°C to +85°C, it meets UC284x specifications. The MIC38C43BMTR operates with a low start-up current of 50µA and has a low operating current of 4mA. It also has CMOS outputs with rail-to-rail swing and offers current-mode operation at a frequency of ≥ 500kHz. The controller includes a trimmed 5V bandgap reference and a trimmed oscillator discharge current. It has UVLO with hysteresis and low cross-conduction currents.

Specifications and features

• Fixed frequency, high-performance PWM controller
• Pin-compatible with UC3842/3843/3844/3845(A)
• Fast 40ns output rise and 30ns output fall times
• Temperature range: -40°C to +85°C
• Ultralow start-up current: 50µA typical
• Low operating current: 4mA typical
• CMOS outputs with rail-to-rail swing
• Current-mode operation at ≥ 500kHz
• Trimmed 5V bandgap reference
• Trimmed oscillator discharge current
• UVLO with hysteresis
• Low cross-conduction currents

Application Scenarios

The MIC38C43BMTR is widely used in applications requiring a high-performance and efficient PWM controller. It is suitable for various DC-DC switching control applications, including power supplies, LED lighting, industrial control systems, and automotive electronics.

Comparison

• Improved performance compared to UC3842/3843/3844/3845(A)
• Fast output rise and fall times for efficient operation
• Wide temperature range (-40°C to +85°C)
• Low start-up and operating currents
• CMOS outputs with rail-to-rail swing

• No significant disadvantages identified.