Designed to meet high-current requirements at high efficiency in

industrial and consumer applications; embedded core, memory, or logic

supplies; TVs, VCRs, and office or telecommunications equipment, the

SI-8090JD dc/dc step-down (buck) converter offers a constant 125 kHz

switching frequency essential for low EMI noise. The npn switch is

included on the die along with the oscillator, control, and logic circuitry

requiring only four external components for a regulated 9.0 V output at

up to 1.5 A. .

A wide input voltage range and integrated thermal and overcurrent

protection enhance overall system reliability. Reference accuracy and

excellent temperature characteristics are provided. An output-enable

input gives the designer complete control over power up, standby, or

power down.

This device is supplied in a 5-lead surface-mount plastic package

(TO-263) with ground tab to provide a low-resistance path for maximum

heat dissipation. A similar device in a flange-mounted (TO-220-style)

high-power package is the SI-8090JF.

FEATURES

■ 11 V to 40 V Input Range

■ 1.5 A Output Current at 9.0 V

■ 2% Output Voltage Tolerance

■ Foldback Current Limiting

■ Constant 125 kHz Switching Frequency

■ 200 µA Maximum Standby Current

■ Soft Start Prevents Supply Voltage Dip

■ Remote Voltage Sensing

■ Exposed Pad for Superior Heat Dissipation

■ Thermal Protection

APPLICATIONS

■ TVs, VCRs, Electronic Games

■ Embedded Core, Memory, or Logic Supplies

■ Printers and Other Office Equipment

■ Industrial Machinery

■ Telecommunications Equipment

Step-Down to 9.0 V, 1.5 A, DC/DC Converter

Always order by complete part number, e.g., SI-8090JD-TL ,

where “-TL” indicates tape and reel.

ABSOLUTE MAXIMUM RATINGS

Input Voltage, V

43 V

Output Current, I

1.5 A*

Enable Input Voltage, V

OE

. . . . . . . . . . .

6 V

Junction Temperature, T

+125°C

Storage Temperature Range,

T

-40°C to +125°C

* Output current rating is limited by input

voltage, duty cycle, and ambient tempera-

ture. Under any set of conditions, do not

exceed a junction temperature of +125°C.

SI-8090JD

Sanken Power Devices

from Allegro MicroSystems

Switching

Regulators