ALLEGRO SI-3018LSA User Manual

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Data Sheet

27468.18*

Linear

Regulators

1

IN

INTERNAL

CONNECTION

SUPPLY GND

ENABLE

IC

2

S

V

3

45

VR

ABSOLUTE MAXIMUM RATINGS

8

7

SUB

6

Dwg. PK-012

OUT

OUT

GND

SI-

3018

LSA

LOW-VOLTAGE, HIGH-CURRENT

1.8 V LINEAR REGULATOR

The SI-3018LSA is designed to meet the requirement for increased
integration and reliability in low-voltage, high-current, linear regulator
applications such as personal computers (PCs) and set-top boxes. Each
device incorporates a monolithic low-level reference and control circuit
with a high-current pnp transistor in a power multi-chip module
(PMCM™). Regulated output voltages of 2.5 V or 3.3 V are also
available.

The high-current pass element provides an output current to 1 A.
Regulator accuracy of ±2 % and excellent temperature characteristics
are provided. The logic-compatible ENABLE input gives the designer
complete control over power up, power down, and standby or sleep.

These devices are supplied in a fully molded 8-lead miniature
surface-mount package (tape and reel) with enhanced power-dissipating
qualities. They are rated for continuous operation between -30°C and
+100°C.

Input Voltage, VI................................ 16 V

Supply Voltage, VS............................ 16 V

Continuous Output Current, IO........ 1.0 A*

Logic Input Voltage, VE......................... V

Package Power Dissipation,

PD........................................ See Graph

Output Junction Temperature,

TJ............................................ +150°C†

Operating Temperature Range,

TA............................... -30°C to +100°C

Storage Temperature Range,

T

............................. -30°C to +150°C

stg

* Output current rating may be limited by duty
cycle, ambient temperature, and heat sinking.
Under any set of conditions, do not exceed the
specified current rating or a junction temperature
of 150˚C.

† Fault conditions that produce excessive
junction temperature will activate the device’s
thermal protection circuitry. These conditions
can be tolerated but should be avoided.

FEATURES

■ 1 A Output Current

S

■ LSTTL/CMOS-Compatible On/Off Control

Less Than 1 µA “Sleep” Current

■ Internal Foldback Overcurrent Limiting

■ Internal Thermal Protection

■ Surface-Mount Package

Always order by complete part number: SI-3018LSA-TL , where “-TL”
indicates tape and reel.

Sanken Power Devices

from Allegro MicroSystems

™

SI-3018LSA
LOW-VOLTAGE, HIGH-CURRENT

1.8 V LINEAR REGULATOR

FUNCTIONAL BLOCK DIAGRAM

INPUT

1

Linear

Regulators

INTERNAL

CONNECTION

SUPPLY

ENABLE

2

3

SUB

+

THERMAL

PROTECTION

4

5

OUTPUT

8

OUTPUT

7

GROUNDGROUND

6

Dwg. FK-019

Leads 7 and 8 are soldered to the
copper area and provide heat
sinking of the pass transistor.

RECOMMENDED OPERATING CONDITIONS

Max. Input Voltage, VI................................................ 3.5 V

Output Current, IO.......................................... 0 A to 1.0 A

Output Junction Temperature Range, TJ -20 °C to +125°C

Ambient Temperature Range, TA.............. -30°C to +85°C

For the availability of parts meeting -40°C requirements,
contact Allegro’s Sales Representative.

This data sheet is based on Sanken data sheet SSJ-01835.

2

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

Copyright © 2001, 2005 Allegro MicroSystems, Inc.

TM

Linear

Regulators

SI-3018LSA

LOW-VOLTAGE, HIGH-CURRENT

1.8 V LINEAR REGULATOR

ELECTRICAL CHARACTERISTICS at T

= +25°C, V

A

= VS = 3.3 V, VE = 2.0 V (unless otherwise

I

noted).

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Output Voltage V

Output Volt. Temp. Coeff. a

Overcurrent Limit I
Line Regulation ∆V
Load Regulation ∆V

Dropout Voltage VImin - VOIO ≤ 1 A — 0.55 1.2 V

Ground Terminal Current I

Rejection Ratio PSRR 100 Hz ≤ f ≤ 120 Hz — 60 — dB

ENABLE Input Voltage V

V

OQ

VO

OM

O(∆VI)

O(∆IO)

GND

I

Q

EH

O

IO = 500 mA 1.764 1.800 1.836 V

VE = 0 V, Output Off — — 0.5 V

IO = 5 mA, 0°C ≤ TJ ≤ 100°C—±0.3 — mV/°C

VO = 95% of VO at IO = 500 mA 1.2 1.5 — A

3.1 V ≤ VI = VS ≤ 3.5 V, IO = 300 mA — 2.0 10 mV
0 ≤ IO ≤ 1 A — 10 20 mV

IO = 0 mA — 1.7 2.5 mA

VE = 0 V, IO = 0 mA — — 1.0 µA

Output On 2.0 — — V

V

ENABLE Input Current I

Thermal Protection Temp. T

Thermal Resistance R

Typical values are at T

= +25°C and are given for circuit design information only.

A

EL

EH

I

EL

J

θJL

Output Off — — 0.8 V

VE = 2 V, Output On — 30 80 µA

VE = 0 V, Output Off — 0 -5.0 µA

135 150 — °C

To terminals 7 and 8 — 36 — °C/W

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