SI-3011ZF-T - Allegro MicroSystems, Inc.

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-3011ZF 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 fixed output voltages of 2.5 V or 3.3 V 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 700 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 fully molded TO-220-style 5-lead

flange-mounted , high power, isolated plastic package. A similar device

in a lower-power surface-mount plastic package is the SI-3011ZD.

FEATURES

■3 A Output Current

■0.7 V Maximum Dropout Voltage at IO = 3 A

■1 µA Maximum Standby Current

■Adjustable 1.1 ~ 5 V Output Voltage

■Remote Voltage Sensing

■Foldback Current Limiting

■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, 1.1~5 V Regulator

Data Sheet

27468.41*

Always order by complete part number, e.g., SI-3011ZF .

ABSOLUTE MAXIMUM RATINGS

Input Voltage, VI. . . . . . . . . . . . . 10 V

Output Current, IO. . . . . . . . . . . . . 3 A*

Enable Input Voltage, VE. . . . . . . . 6 V

Junction Temperature, TJ. . . . +125°C

Storage Temperature Range,

TS. . . . . . . . . . . . -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-3011

Linear

Regulators

Sanken Power Devices

from Allegro MicroSystems

SI-3011ZF

High-Current,

Low-Dropout,

1.1~5 V Regulator

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036

Linear

Regulators

FUNCTIONAL BLOCK DIAGRAM

Recommended Operating Conditions

Min Max Units

DC Input Voltage — 6 V

DC Output Current 0 3 A

Adjustable Voltage Range 1.2 5 V

Operating Junction Temp. -20 +100 °C

For the availability of parts meeting -40°C requirements,

contact Allegro’s Sales Representative.

Allowable Package Power Dissipation

This data sheet is based on Sanken data sheet SSJ-02605

SI-3011ZF

High-Current,

Low-Dropout,

1.1~5 V Regulator

www.allegromicro.com

Linear

Regulators

ELECTRICAL CHARACTERISTICS at TA = +25°C, VO = 2.5 V adjusted, VE = 2 V (unless otherwise noted).

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Output Voltage VOVI = VO(nom) + 1 V, IO = 10 mA — VO(nom) —V

VO(off) VE = 0 V — — 0.5 V

Output Volt. Temp. Coeff. aVO 0°C ≤ TJ ≤ 100°C — ±0.3 — mV/°C

Internal Reference Voltage Vref VI = VO(nom) + 1 V, IO = 10 mA 1.078 1.100 1.122 V

Output Short-Circuit Current IOM VI = VO(nom) + 1 V, see note 3.2 — — A

Line Regulation ∆VO(∆VI) VI = 3.0 ~ 5.0 V, IO = 10 mA — — 10 m V

Load Regulation ∆VO(∆IO) VI = 3.3 V, IO = 0 A ~ 3.0 A — — 40 m V

Dropout Voltage

Imin

- V

IO = 3.0 A — — 0.7 V

Ground Terminal Current IGND VI = VO(nom) + 1 V, IO = 0 mA, VE = 2.0 V — 1.0 1.5 mA

VI = VO(nom) + 1 V, VE = 0 V — — 1.0 µA

Enable Input Voltage VEH Output ON 2.0 — — V

VEL Output OFF — — 0.8 V

Enable Input Current IEH VE = 2.7 V — — 100 µA

IEL VE = 0 V — 0 -5.0 µ A

Ripple Rejection Ratio PSRR VI = VO(nom) + 1 V, 100 Hz ≤ f ≤ 120 Hz — 60 — dB

Thermal Shutdown TJ135 152 — °C

Typical values are given for circuit design information only.

Note: Output short-circuit current is at point where output voltage has decreased 5% below VO(nom).

SI-3011ZF

High-Current,

Low-Dropout,

1.1~5 V Regulator

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036

Linear

Regulators

TYPICAL CHARACTERISTICS

(VO = 2.5 V adjusted, TA = 25°C)

 Dropout Voltage  Low-Voltage Behavior  GND Pin Current

 Line Regulation  Load Regulation

 ENABLE Control Voltage

 Overcurrent Protection

 ENABLE Control Current  Thermal Protection

SI-3011ZF

High-Current,

Low-Dropout,

1.1~5 V Regulator

www.allegromicro.com

Linear

Regulators

APPLICATIONS INFORMATION

Input Capacitor (CI, approximately 10 µF). This is

necessary either when the input line includes inductance or

when the wiring is long.

Output Capacitor (CO, > 47 µF). This device is not

designed for a use with a very low ESR output capacitor

such as a ceramic capacitor. Output oscillation may occur

with that kind of capacitor.

Output Voltage Adjustable Resistors (R1 and R2).

The output voltage is adjusted by R1 and R2. 10 kΩ or

11 kΩ for R2 is recommended.

R1 = (VO – Vref)/(Vref/R2)

For an output voltage of 1.8 V or less, add a 10 kΩ resistor

between ADJ and the junction of R1 and R2.

Determination of DC Input Voltage. The minimum

input voltage VI(min) should be higher than the sum of the

fixed output voltage and the maximum rated dropout

voltage. If setting the output voltage lower than 2.0 V, the

minimum input voltage should be more than 2.4 V.

Overcurrent Protection. The SI-3000ZD series has a

built-in fold-back type overcurrent protection circuit, which

limits the output current at a start-up mode. It thus cannot

be used in applications that require current at the start-up

mode such as:

(1) constant-current load,

(2) power supply with positive and negative outputs to

common load (a center-tap type power supply), or

(3) raising the output voltage by putting a diode or a

resistor between the device ground and system ground.

Thermal Protection. Circuitry turns off the pass

transistor when the junction temperature rises above 135°C.

It is intended only to protect the device from failures due to

excessive junction temperatures and should not imply that

output short circuits or continuous overloads are permitted.

Heat Radiation and Reliability. The reliability of the

IC is directly related to the junction temperature (TJ) in its

operation. Accordingly, careful consideration should be

given to heat dissipation. The graph on page 2 illustrates

the effect of thermal resistance on the allowable package

power dissipation.

When mounting to a heat sink, apply silicone grease (Shin-

Etsu Chemical G746, Dow Corning Toray Silicone SC102,

or Toshiba Silicone SY6260). Recommended mounting

hardware torque: 0.588 ~ 0.686 Nm or 6.0 ~ 7.0 kgf•cm

(4.34 ~ 5.06 lbf•ft).

The junction temperature (TJ) can be determined from

either of the following equations:

TJ = (PD × RθJA) + TA

or TJ = (PD × RθJC) + TC

where PD = IO × (VI – VO) and

RθJC = 5°C/W.

Parallel Operation. Parallel operation to increase load

current is not permitted.

SI-3011ZF

High-Current,

Low-Dropout,

1.1~5 V Regulator

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036

Linear

Regulators

Dimensions in Millimeters

Terminal Finish: Sn–3Ag–0.5Cu, 2nd level interconnect category (e1)

Product Weight: Approx. 2.3 g

Terminal spacing is measured at lead tips.

SI-3011ZF

High-Current,

Low-Dropout,

1.1~5 V Regulator

www.allegromicro.com

Linear

Regulators

Shipping Container Dimensions in Millimeters

Primary Packing: A U-shaped cardboard separator (Fig. 1) is

used to accommodate a maximum of 100 pieces (5 × 20) and, if

less than 100 pieces, a shock absorber shall be placed in the

vacant space. Each thin primary carton (Fig. 2) will contain a

maximum of 400 pieces in four rows.

Secondary Packing: The secondary carton (Fig. 3) contains

nine thin cartons.

EI16EI

SI-3011ZF

High-Current,

Low-Dropout,

1.1~5 V Regulator

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036

Linear

Regulators

The products described herein are manufactured in Japan by Sanken

Electric Co., Ltd. for sale by Allegro MicroSystems, Inc.

Sanken and Allegro reserve the right to make, from time to time, such

departures from the detail specifications as may be required to permit

improvements in the performance, reliability, or manufacturability of its

products. Therefore, the user is cautioned to verify that the information

in this publication is current before placing any order.

When using the pr oducts described her ein, the applicability and

suitability of such pr oducts for the intended purpose shall be r eviewed at

the users responsibility .

Although Sanken undertakes to enhance the quality and r eliability of

its pr oducts, the occurr ence of failur e and defect of semiconductor

pr oducts at a certain rate is inevitable.

Users of Sanken pr oducts ar e r equested to take, at their own risk,

pr eventative measur es including safety design of the equipment or

systems against any possible injury , death, fir es or damages to society

due to device failure or malfunction.

Sanken pr oducts listed in this publication are designed and intended

for use as components in general-purpose electr onic equipment or

apparatus (home appliances, office equipment, telecommunication

equipment, measuring equipment, etc.). Their use in any application

r equiring radiation har dness assurance (e.g., aerospace equipment) is

not supported.

When considering the use of Sanken pr oducts in applications wher e

higher r eliability is r equired (transportation equipment and its contr ol

systems or equipment, fir e- or burglar-alarm systems, various safety

devices, etc.), contact a company sales r epresentative to discuss and

obtain written confirmation of your specifications.

The use of Sanken pr oducts without the written consent of Sanken in

applications wher e extremely high r eliability is requir ed (aer ospace

equipment, nuclear power-contr ol stations, life-support systems, etc.) is

strictly pr ohibited.

The information included herein is believed to be accurate and

reliable. Application and operation examples described in this publica-

tion are given for reference only and Sanken and Allegro assume no

responsibility for any infringement of industrial property rights,

intellectual property rights, or any other rights of Sanken or Allegro or

any third party that may result from its use.