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Related Links:

Datasheets:
SI-3033ZD: High-Current, Low-Dropout, 3.3 V Regulator (PDF)

Selection Guides:
Sanken Linear Regulators

when this product is updated

Press Releases:
Allegro Expands Product Line with Sanken Offerings

SI-3033ZD
High-Current, Low-Dropout, 3.3 V Regulator

Features

• 3 A Output Current at 3.3 V
• 0.6 V Maximum Dropout Voltage at IO = 3 A
• 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

Description

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 improved 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-3033ZF.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
SI-3033ZD	5-lead TO-263	Yes	--	-40 °C to  125 °C	new

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.