1FEATURES

• Qualified for Automotive Applications

• ESD Protection Exceeds 1500 V Per MIL-STD-

883, Method 3015; Exceeds 200 V Using

Machine Model (C = 200 pF, R = 0)

• Dual Output Drive Stages in Push-Pull

Configuration

• Current Sense Discharge Transistor to

Improve Dynamic Response

• 130-μA Typical Starting Current

• 1-mA Typical Run Current

• Operation to 1 MHz

• Internal Soft Start

• On-Chip Error Amplifier With 2-MHz Gain

Bandwidth Product

• On Chip VDD Clamping

• Output Drive Stages Capable of 500-mA Peak-

Source Current, 1-A Peak-Sink Current

DESCRIPTION

The UCC2808A-xQ1 is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The

UCC2808A-xQ1 contains all of the control and drive circuitry required for off-line or DC-to-DC fixed frequency

current-mode switching power supplies with minimal external parts count.

The UCC2808A-xQ1 dual output drive stages are arranged in a push-pull configuration. Both outputs switch at

half the oscillator frequency using a toggle flip-flop. The dead time between the two outputs is typically 60 ns to

200 ns depending on the values of the timing capacitor and resistors, thus limiting each output stage duty cycle

to less than 50%.

The UCC2808A-xQ1 family offers a variety of package options and choice of undervoltage lockout levels. The

family has UVLO thresholds and hysteresis options for off-line and battery powered systems. Thresholds are

shown in the ordering information table.

The UCC2808A-xQ1 is an enhanced version of the UCC2808 family. The significant difference is that the A

versions feature an internal discharge transistor from the CS pin to ground, which is activated each clock cycle

during the oscillator dead time. The feature discharges any filter capacitance on the CS pin during each cycle

and helps minimize filter capacitor values and current sense delay.