Designed to meet the high-current requirements in industrial and

consumer applications; embedded core, memory, or logic supplies; TVs,

VCRs, and office equipment, the SI-3033ZD voltage regulator offers the

reduced dropout voltage and low quiescent current essential for im-

proved efficiency. This device delivers a regulated output at up to 3 A.

Integrated thermal and overcurrent protection enhance overall system

reliability. Devices with an adjustable 1.2 ~ 5 V output or a 2.5 V fixed

output are also available.

Quiescent current does not increase significantly as the dropout

voltage is approached, an ideal feature in standby/resume power systems

where data integrity is crucial. Regulator accuracy and excellent

temperature characteristics are provided by a bandgap reference. An

LS-TTL/CMOS-compatible input gives the designer complete control

over power up, standby, or power down. A pnp pass element provides a

dropout voltage of less than 600 mV at 3 A of load current. Low output

voltages eliminate the need for expensive PWM buck converters. The

low dropout voltage permits more efficient regulation before output

regulation is lost.

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-3025ZF.

FEATURES

■ 3 A Output Current at 3.3 V

■ 0.6 V Maximum Dropout Voltage at I

■ 1 µA Maximum Standby Current

■ Remote Voltage Sensing

■ Foldback Current Limiting

■ Ground Tab for Superior Heat Dissipation

■ Thermal Protection

APPLICATIONS

■ TVs, VCRs, Electronic Games

■ Embedded Core, Memory, or Logic Supplies

■ Printers and Other Office Equipment

■ Industrial Machinery

■ Secondary-Side Stabilization of Multi-Output SMPS

High-Current, Low-Dropout, 3.3 V Regulator

Always order by complete part number, e.g., SI-3033ZD-TL ,

where “-TL” indicates tape and reel.

ABSOLUTE MAXIMUM RATINGS

Input Voltage, V

10 V

Output Current, I

3 A*

Enable Input Voltage, V

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-3033ZD

Linear

Regulators

Sanken Power Devices

from Allegro MicroSystems