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UC2844BD1R2G

ONUC2844BD1R2G

onsemi
Boost, Flyback Regulator Positive, Isolation Capable Output Step-Up, Step-Up/Step-Down DC-DC Controller IC 8-SOIC
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Overview

The UC2844BD1R2G is a high-performance, fixed-frequency current mode PWM controller designed for off-line and DC-to-DC converter applications. It features a trimmed oscillator for precise frequency control and a high-current totem pole output capable of driving power MOSFETs directly. This controller is specifically optimized for applications requiring a maximum duty cycle limited to 48 percent.

Why Choose This Part

The UC2844BD1R2G provides excellent line and load regulation through automatic feed-forward compensation and a latching PWM architecture. Its low operating current of 12mA and integrated undervoltage lockout with hysteresis ensure reliable startup and high efficiency in power-constrained designs.

Applications

Off-Line Flyback Converters
Ideal for isolated power supplies where cycle-by-cycle current limiting and low startup current are critical.
DC-DC Boost Regulators
Used in step-up applications requiring stable current-mode control and undervoltage lockout protection.
Industrial Power Supplies
Suitable for robust industrial environments thanks to its wide VCC range of up to 36V and 1A peak output current.

Key Specifications

Function Step-Up, Step-Up/Step-Down
Topology Boost, Flyback
Clock Sync No
Output Type Transistor Driver
Mounting Type Surface Mount
Output Phases 1
Package / Case 8-SOIC (0.154", 3.90mm Width)
Control Features Frequency Control
Duty Cycle (Max) 48%
Number of Outputs 1
Output Configuration Positive, Isolation Capable
Frequency - Switching Up to 500kHz
Operating Temperature -25degC ~ 85degC (TA)
Synchronous Rectifier No
Supplier Device Package 8-SOIC
Voltage - Supply (Vcc/Vdd) 10V ~ 36V

Getting Started

When designing with the UC2844BD1R2G, ensure the VCC bypass capacitor is placed as close to the IC pins as possible to handle high-current switching transients. Engineers should use the trimmed 5V reference (Vref) for setting the oscillator frequency and providing a stable bias for the error amplifier. Evaluation can be performed using standard SOIC-8 prototyping adapters or custom power supply reference designs.