SC431LCSK-.5TR Semtech Corporation, SC431LCSK-.5TR Datasheet

SC431LCSK-.5TR

Manufacturer Part Number

SC431LCSK-.5TR

Description

Adjustable Shunt Regulator

Manufacturer

Semtech Corporation

Datasheet

1.SC431LCSK-.5TR.pdf (10 pages)

Specifications of SC431LCSK-.5TR

05+

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The SC431L is a three terminal adjustable shunt

regulator with thermal stability guaranteed over

temperature. The output voltage can be adjusted to any

value from 1.24V (V

resistors. The SC431L has a typical dynamic output

impedance of 0.05 . Active output circuitry provides a

very sharp turn on characteristic, making the SC431L an

excellent replacement for zener diodes.

The SC431L shunt regulator is available with four volt-

age tolerances (0.25%, 0.5%, 1.0% and 2.0%), two

operating temperature ranges (commercial and indus-

trial) and two package options (SOT-23-3 and SOT-23-

5). This allows the designer the opportunity to select the

optimum combination of cost and performance for their

application.

Revision: May 16, 2008

POWER MANAGEMENT

Description

Typical Application Circuit

REF

) to 20V with two external

(1)(2)

Notes:

1) Set V

2) Choose the value for R as follows:

•

cathode current, I

operating current (100µA) at V

•

not exceed 100mA under all load conditions, and the

instantaneous turn-on value for I

150mA. Both of the following conditions must be met:

Features

Applications

OUT

min

Low voltage operation (down to 1.24V)

Wide operating current range 100µA to 100mA

Low dynamic output impedance 0.05

Trimmed bandgap design ± 0.25%

Upgrade for TLV431A

SOT-23-3 and SOT-23-5 packages. Also available in

Lead-free package, fully WEEE and RoHS compliant

Linear Regulators

Adjustable Supplies

Switching Power Supplies

Battery Operated Computers

Instrumentation

Computer Disk Drives

The maximum limit for R should be such that the

The minimum limit for R should be such that I

150

OUT

REF

OUT

(max)

(min)

(max)

according to the following equation:

100

(to limit instantaneous turn-on I

OUT

Low Voltage Adjustable

REF

, is greater than the minimum

operating conditions)

(to limit I

Shunt Regulator

IN(MIN)

under normal

does not exceed

www.semtech.com

SC431L

typ.

)

does

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SC431LCSK-.5TR Summary of contents

Page 1

POWER MANAGEMENT Description The SC431L is a three terminal adjustable shunt regulator with thermal stability guaranteed over temperature. The output voltage can be adjusted to any value from 1.24V ( 20V with two external REF resistors. The SC431L ...

Page 2

POWER MANAGEMENT Absolute Maximum Ratings ...

Page 3

POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified:T = 25°C. Values in bold apply over full operating ambient temperature range ...

Page 4

POWER MANAGEMENT Test Circuits Test Circuit REF Pin Configurations SOT-23-3 (Top View) Block Diagram 2008 Semtech Corp. Test Circuit 2 V > REF SOT-23-5 (Top View) Symbol 4 SC431L Test Circuit 3 Off-State ...

Page 5

POWER MANAGEMENT Ordering Information ° ...

Page 6

POWER MANAGEMENT Typical Characteristics Cathode Current vs. Cathode Voltage 300 REF 200 100 0 -100 -200 -300 -1 -0 (V) Z Reference Voltage vs. Junction Temperature 1.248 1.246 ...

Page 7

POWER MANAGEMENT Typical Characteristics (Cont.) Reference Impedance vs. Junction Temperature 0. 0.1 to 100 REF f < 1 kHz 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.00 -50 -25 0 ...

Page 8

POWER MANAGEMENT Applications Information - Stability Selection of load capacitance when using SC431L as a shunt regulator When the SC431L is used as a shunt regulator, two options for selection of C (see diagram on page 7) are L recommended ...

Page 9

POWER MANAGEMENT Outline Drawing - SOT-23 SIDE VIEW NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). -A- 2. DATUMS 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. Land Pattern - ...

Page 10

... DIM INCHES INCHES (.098 .055 .037 X X .024 .043 Z Z .141 Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 10 SC431L DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX - - .035 .057 0.90 1. .000 .006 0.00 0.15 ...

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