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SC431LC5SK-1TR

更新时间： 2024-09-14 06:10:15

品牌	Logo	应用领域
商升特 - SEMTECH		稳压器
页数	文件大小	规格书
10页	209K
描述
Low Voltage Adjustable Shunt Regulator

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SC431LC5SK-1TR 数据手册

SC431L

Low Voltage Adjustable

Shunt Regulator

POWER MANAGEMENT

Description

Features

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_REF) to 20V with two external

resistors. The SC431L has a typical dynamic output

impedance of 0.05Ω. Active output circuitry provides a

very sharp turn on characteristic, making the SC431L an

excellent replacement for zener diodes.

Low voltage operation (down to 1.24V)

Wide operating current range 100µA to 100mA

Low dynamic output impedance 0.05 Ω typ.

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

Applications

Linear Regulators

Adjustable Supplies

Switching Power Supplies

Battery Operated Computers

Instrumentation

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.

Computer Disk Drives

Typical Application Circuit⁽¹⁾⁽²⁾

Notes:

1) Set V_OUTaccording to the following equation:

V_OUT= V_REF1+

+I_REFR1

2) Choose the value for R as follows:

• The maximum limit for R should be such that the

cathode current, I_Z, is greater than the minimum

operating current (100µA) at V_IN(MIN)

• The minimum limit for R should be such that I_Zdoes

not exceed 100mA under all load conditions, and the

instantaneous turn-on value for I_Zdoes not exceed

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

V_IN(max)

150 mA

R _min

≥

(to limit instantaneous turn-on I_Z)

V_IN(max)− V_OUT

I_{OUT (min)}+100 mA

R_min

(to limit I_Zunder normal

operating conditions)

Revision: May 16, 2008

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