Current Mode PWM Controller 1.5A 16-Pin SOIC Tube

The UC3886 family of PWM controller ICs is designed for DC-to-DC con-verters with average current mode control. It is designed for use in con-junction with the UC3910 4-bit DAC and Voltage Monitor. The UC3886drives an external N-channel MOSFET and can be used to power the In-tel Pentium® Pro and other high-end microprocessorsThe UC3886 in conjunction with the UC3910 converts 5VDC to an adjust-able output ranging from 2.0V to 3.5V in 100mV steps with 35mV DC sys-tem accuracyThe oscillator is programmed by the user’s selection of an external resis-tor and capacitor, and is designed for 300kHz typical operationThe voltage and current amplifiers have 3.5MHz gain-bandwidth productto satisfy high performance system requirementsThe internal current sense amplifier permits the use of a low value currentsense resistor, minimizing power loss. It has inputs and outputs accessi-ble to allow user-selection of gain-setting resistors, and is internally com-pensated for a gain of 5 and above. The command voltage input isbuffered and provided for use as the reference for the current sense am-plifierThe output of the voltage amplifier (input to the current amplifier) isclamped to 1 volt above the command voltage to serve as a current limit.The gate output can be disabled by bringing the CAO/ENBL pin to below0.8 volts.

• 10.3V - 20V Operating Range
• Low Offset Voltage Amplifier
• High Bandwidth Current and Voltage Amplifiers
• Low Offset Current Sense Amplifier
• Undervoltage Lockout
• Trimmed 5 Volt Reference
• Externally Programmable Oscillator
• Charge Current
• 1.5A Peak Totem Pole Output
• Available in 16-pin DIL or SOIC Packages