Diodes TLV431 User Manual

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Description

The TLV431 is a three terminal adjustable shunt regulator offering
excellent temperature stability and output current handling capability
up to 20mA. The output voltage may be set to any chosen voltage
between 1.24 and 18 volts by selection of two external divider
resistors.

The TLV431 can be used as a replacement for zener diodes in many
applications requiring an improvement in zener performance.

The TLV431 is available in 3 grades with initial tolerances of 1%,

0.5%, and 0.2% for the A, B and T grades respectively.

Features

• Low Voltage Operation V

• Temperature range -40 to +125°C

• Reference Voltage Tolerance at +25°C

 0.2% TLV431T
 0.5% TLV431B
 1% TLV431A

• Typical temperature drift

 4 mV (0°C to +70°C)
 6 mV (-40°C to +85°C)
 11mV (-40°C to +125°C)

• 80µA Minimum cathode current

• 0.25Ω Typical Output Impedance

• Adjustable Output Voltage V

• Lead-Free Finish; RoHS Compliant (Notes 1 & 2)

• Halogen and Antimony Free. “Green” Device (Note 3)

• Qualified to AEC-Q100

= 1.24V

REF

REF

to 18V

Typical Application Circuit

Secondary side

regulated supply

Primary side

controller

Optocoupler

I

F

3.3 V

1.24V COST EFFECTIVE SHUNT REGULATOR

Pin Assignments

CATHODE 1

CATHODE

CATHODE

‡ Pin should be left floating or connect to anode

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TLV431_H6 (SC70-6 [SOT363])

2

N/C

REF

TLV431_F (SOT23)

REF 1

3

(Top View)

6 ANODE

5 NC

4 NC

3 ANODE

2

(Top View)

3

(Top View)

5 ANODE

4 REF

TLV431_E5 (SOT25)

N/C 1

2

N/C

TLV431

R3



TLV431

GND

Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.

2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.

R1

R2

TLV431

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TLV431

Absolute Maximum Ratings (@T

Symbol Parameter Rating Unit

VKA

IKA

I

REF

VIN

ESD Susceptibility

HBM Human Body Model 4 kV

MM Machine Model 400 V

CDM Charged Device Model 1 kV

(Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and
transporting these devices.)

Operating Junction Temperature -40 to +150 °C
Storage Temperature -65 to +150 °C

Operation above the absolute maximum rating may cause device failure.
Operation at the absolute maximum ratings, for extended periods, may reduce device reliability.
Unless otherwise stated voltages specified are relative to the ANODE pin.
These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure.

Cathode Voltage 20 V
Continuous Cathode Current -20 to +20 mA
Reference Input Current Range -0.05 to +3 mA
Input Supply Voltage (Relative to Ground) -0.03 to +18 V

Parameter Rating Unit

Recommended Operating Conditions (@T

Symbol Parameter Min Max Units

VKA

IKA
TA

Cathode Voltage
Cathode Current 0.1 15 mA

Operating Ambient Temperature Range

= +25°C, unless otherwise specified.)

A

= +25°C, unless otherwise specified.)

A

V

REF

-40 +125 °C

18 V

Package Thermal Data

P

Package

SOT23 380°C/W 330mW
SOT25 250°C/W 500mW

SC70-6

(SOT363)

θ

JA

380°C/W 330mW

T

= +25°C, TJ = +150°C

A

TLV431

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TLV431

Electrical Characteristics (@T

Symbol Parameter Conditions Min Typ Max Units

Reference Voltage

Deviation of reference
voltage over full
temperature range

Ratio of change in
reference voltage to the
change in cathode
voltage

Reference Input Current

deviation over full

I

REF

temperature range

Minimum cathode
current for regulation

Off state current
Dynamic output

impedance

V

REF

V

REF(dev)

ΔV

ΔV

I

REF

I

REF(dev)

I

KMIN

I

K(OFF)

ZKA

REF

KA

= +25°C, unless otherwise specified.)

A

= V

REF

REF

REF

REF

REF

,

,

,

,

V

KA

= +25°C

T

A

VKA = V

= 0 to +70°C

T

A

VKA = V

= -40 to +85°C

T

A

VKA = V

= -40 to +125°C

T

A

VKA = V

TLV431A 1.228 1.24 1.252
TLV431B 1.234 1.24 1.246
TLV431T 1.2375 1.24 1.2425
TLV431A 1.221 1.259
TLV431B 1.227 1.253
TLV431T 1.230 1.250
TLV431A 1.215 1.265
TLV431B 1.224 1.259
TLV431T 1.228 1.252
TLV431A 1.209 1.271
TLV431B 1.221 1.265
TLV431T 1.224 1.255

= 0 to +70°C

T

A

TA = -40 to +85°C

TA = -40 to +125°C

6V -1.5 -2.7

V

KA

for V

REF

to

18V -1.5 -2.7

R1 = 10kΩ, R2 = OC

= 0 to +70°C

T

= 10kΩ,

R

1

R

= OC

2

VKA = V

REF

A

TA = -40 to +85°C

TA = -40 to +125°C

= 0 to +70°C

T

A

TA = -40 to +85°C

TA = -40 to +125°C

= 18V, V

V

KA

V

= V

KA

REF,

= 0.1 to 15mA

I

K

= 0V

REF

f = <1kHz

V

4 12
6 20

mV

11 31

mV/V

0.15 0.5 µA

0.05 0.3

0.1 0.4

µA

0.15 0.5
55 80
55 80

µA

55 100

0.001 0.1 µA

0.25 0.4 Ω

TLV431

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Typical Characteristics

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TLV431

56kΩ

75kΩ

I

K

O/P

S1

10mA

100nF

10kΩ

Test Circuit for V

TLV431

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Measurement

REF

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Typical Characteristics (cont.)

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TLV431

TLV431

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