SC431_05 SEMTECH [Semtech Corporation], SC431_05 Datasheet

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SC431_05

Manufacturer Part Number
SC431_05
Description
Adjustable Shunt Regulator
Manufacturer
SEMTECH [Semtech Corporation]
Datasheet
1.SC431_05.pdf (9 pages)
The SC431 is a three terminal adjustable shunt
regulator with thermal stability guaranteed over
temperature. The output voltage can be adjusted to any
value from 2.5V (V
resistors. The SC431 has a typical dynamic output
impedance of 0.25 . Active output circuitry provides a
very sharp turn on characteristic, making the SC431 an
excellent replacement for zener diodes.
The SC431 shunt regulator is available with four
voltage tolerances (0.5%, 1.0% and 2.0% over T
to +85
package
allows the designer the opportunity to select the
optimum combination of cost and performance for their
application.
Revision: January 13, 2005
POWER MANAGEMENT
Description
Typical Application Circuit
°
C and 0.5% over T
options
REF
(SOT-23-3
) to 30V with two external
A
= -40
(1)(2)
°
C to +125
and
SO-8).
°
C) and two
A
= -40
This
°
C
1
Notes:
1) Set V
2) Choose the value for R as follows:
•
cathode current, I
operating current (130µA) at V
•
not exceed 150mA under all load conditions, and the
instantaneous turn-on value for I
200mA. Both of the following conditions must be met:
R
R
Features
Applications
V
OUT
min
min
Wide operating current range 130µA to 150mA
Low dynamic output impedance 0.25
Trimmed bandgap design + 0.5%
Alternate for TL1431, TL431, LM431 & AS431
Industrial temperature range
Available in SOT-23-3 and SO-8 packages
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
I
200
V
V
OUT
V
REF
IN
IN
OUT
(max)
(min)
mA
(max)
Adjustable Shunt Regulator
1
according to the following equation:
150
R
R
(to limit instantaneous turn-on I
V
1
2
OUT
mA
I
Z
REF
, is greater than the minimum
(to limit I
operating conditions)
R
1
IN(MIN)
Z
under normal
.
Z
does not exceed
www.semtech.com
SC431
typ.
Z
)
Z
does

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SC431_05 Summary of contents

Page 1

POWER MANAGEMENT Description The SC431 is a three terminal adjustable shunt regulator with thermal stability guaranteed over temperature. The output voltage can be adjusted to any value from 2. 30V with two external REF resistors. The SC431 ...

Page 2

POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied ...

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 Pin Configurations SOT-23-3 (Top View) Block Diagram Ordering Information ...

Page 5

POWER MANAGEMENT Marking Information SOT-23-3 (Top View 2005 Semtech Corp. SO-8 (Top View) SC 431CS yyww SO-8 (Bottom View) xxxxx yyww = Datecode (Example: 0008) xxxxx = Semtech Lot # (Example: 00101) 5 SC431 ...

Page 6

POWER MANAGEMENT Typical Characteristics Cathode Current vs. Cathode Voltage 300 REF 200 100 0 -100 -200 -300 - (V) Z Reference Voltage vs. Junction Temperature 2.515 V ...

Page 7

POWER MANAGEMENT Typical Characteristics (Cont.) Small-Signal Gain and Phase Shift vs. Frequency -10 -20 1.0E+02 1.0E+03 1.0E+04 f (Hz) Reference Impedance vs. Frequency 100 I = 10mA 25°C ...

Page 8

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

Page 9

POWER MANAGEMENT Outline Drawing - SO-8 E/2 2X ccc C 2X N/2 TIPS aaa C SEATING PLANE C NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD ...

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