Champion CM431A Service Manual

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LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR

GENERAL DESCRIPTION

The CM431A is a three-terminal adjustable shunt voltage
regulator with specified thermal stability and pin-to-pin compatible
with the earlier 431 series. The output voltage can be adjusted to
any value between V
The CM431A offers low output impedance for improved load
regulation with a typical output impedance of 200mΩ. Because
of the active output circuitry, the CM431A can replace the zener
diodes in applications such as switching power supplies, OVP
crowbar circuits, references for A/D, D/A converters with
improved turn-on characteristics.

and 18V by using two external resistors.

REF

CM431A

FEATURES

 Initial voltage reference accuracy of 1.0%.
 Sink current capability from 1mA to 100mA
 Typical output dynamic impedance less than 200mΩ;
 Adjustable output voltage from V
 Available in SOT-23, SOT-89, TO-92, & SOP-8
 Low output noise
 Typical equivalent full range temperature coefficient of

30ppm/

O

C

APPLICATIONS

 Voltage Reference
 Precision shunt regulator
 High current shunt regulator
 PWM down converter with reference
 Voltage monitor

REF

to 18V

PIN CONFIGURATION

TO-92

Front View

ANODE

CATHODE

REF

23

1

SOT-23-5

Top View

5

4

REF

SOT-23-3
Top View

3

1

2

SOT-89

Top View

CM431AXCM233 CM431AXCM2R3
Pin 1 REF CATHODE
Pin 2 CATHODE REF
Pin 3 ANODE ANODE
Suffix “X”: Grade “A”, “B”, “C”, “D”, or “E”

SOP-8

Top View

1

2

CATHODE

NC

REF

NC

8

7

ANODE

REF

NC ANODE

NC

CATHODE

1

1

3

2

CATHODE

23

3

4

NC

NC

ANODE

NC

6

5

2004/08/27 Champion Microelectronic Corporation Page 1

LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR

N

TYPICAL APPLICATION BLOCK DIAGRAM

CM431A

V+

provide cathode
current ≥ 1mA

R

b

ote: Rb should

5V Precision Regulator

= 5V

V

O

R1

27.5K

0.1%

R2

27.5K

0.1%

CATHODE

REF

+

-

V

REF

ANODE

2004/08/27 Champion Microelectronic Corporation Page 2

CM431A

LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR

ORDERING INFORMATION

PACKAGE TOLERANCE

0.5% 1.0% 1.5% T/R Quantity

（2）

（2）

（1）

（1）

（1）

（1）

（1）

（1）

（1）

（1）

CM431AACM233 CM431ABCM233 CM431AECM233 TR=3K

CM431AACM2R3 CM431ABCM2R3 CM431AECM2R3 TR=3K

CM431AACM235 CM431ABCM235 CM431AECM235 TR=3K

CM431AACM89 CM431ABCM89 CM431AECM89 TR=1K

CM431AACN CM431ABCN CM431AECN TA=2K

CM431AGACM233* CM431AGBCM233* CM431AGECM233* TR=3K

CM431AGACM2R3* CM431AGBCM2R3* CM431AGECM2R3* TR=3K

CM431AGACM235* CM431AGBCM235* CM431AGECM235* TR=3K

CM431AGACM89* CM431AGBCM89* CM431AGECM89* TR=1K

CM431AGACN* CM431AGBCN* CM431AGECN* TA=2K

SOT-23-3

SOT-23-3

SOT-23-5

SOT-89

TO-92

SOP-8 CM431AACS CM431ABCS CM431AECS

SOT-23-3

SOT-23-3

SOT-23-5

SOT-89

TO-92

SOP-8 CM431AGACS* CM431AGBCS* CM431AGECS*

Notes：

（1） Add suffix ″TR″for Tape & Reel.
（2） Add suffix ″TA″for Tape Ammo.
（3）

*Note: Add suffix “G” for Pb Free Product

2004/08/27 Champion Microelectronic Corporation Page 3

CM431A

LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR

ABSOLUTE MAXIMUM RATINGS

Cathode to Anode Voltage (VKA) (Note 2) -0.3V to 18V
Continuous Cathode Current (IK) -100mA to 150mA
Reference Input Current (I
Maximum junction temperature range, T
Storage temperature range -65OC to 150OC
Lead temperature (soldiering, 10 seconds) 260 OC

Note 1: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.

Currents are positive into, negative out of the specified terminal.

Note 2: Voltage values are with respect to the anode terminal unless otherwise noted.

POWER DISSIPATION TABLE

Package θ

SOP-8 165 6.06 757 485 394 272

TO-92 156 6.41 801 513 417 288
SOT-89 71(note) 14.1 1763 1128 916 635
SOT-23 285 3.5 438 280 228 158

Note :

1. For SOT-89 package, Thermal Resistance-Junction to Tab ( θ

2. θ

Thermal Resistance-Junction to Ambient

JA:

Junction Temperature Calculation: T

numbers are guidelines for the thermal performance of the device/PC-board system.

The θ

JA

All of the above assume no ambient airflow.

JA

( OC/W )

) -50uA to 10mA

REF

J

Derating factor ( mW/

≧25 OC

T

A

= TA + (PD x θJA).

J

O

C )

Power rating(mW)

T

≦25 OC

A

TA=70 OC

Power rating(mW)

) = 35 OC/W. TJ = T

JT

TAB

150 OC

Power rating (mW)

+ (PD x θJT)

TA= 85 OC

TA= 105 OC

Power rating (mW)

RECOMMENDED OPERATING CONDITIONS

Min Max Units

Operating free air temperature range, T
Cathode current, I
Cathode voltage, V

K

KA

A

0 105 OC
1 100 mA
0 16 V

2004/08/27 Champion Microelectronic Corporation Page 4

LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR

A

y

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, these specifications app l y over the operating ambient temperatures with T

Parameter Symbol Test Conditions

IK = 10mA, VKA = V

Reference Input Voltage V

IK = 10mA, VKA = V

REF

IK = 10mA, VKA = V
Reference Drift IK = 10mA, VKA = V
Voltage Ratio, Ref to Cathode
(note 4)

Reference Input Current I
Minimum Operating Current I

Off-State Cathode Current I
Dynamic Impedance |ZKA |

I

= 10mA, VKA = 2.5V to 18V -1.4 -2.7 mV/V

K

IK = 10mA,VKA = V

REF

IK = 10mA,VKA = V

VKA = V

MIN

OFF

REF

VKA = 18V, V

VKA = V

REF

f ≤ 1kHz

REF

, IK = 1mA to 100mA,

Note 3: These parameters are guaranteed by design

V

Note 4:

REF

V

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

KA

Min T

,0.5% 2.488 2.5 2.512 V

REF

,1.0% 2.475 2.5 2.525 V

REF

,1.5% 2.463 2.5 2.537 V

REF

, 0OC ≤ TA ≤ 70 OC 4 17 mV

REF

REF

, 0OC ≤ TA ≤ 70 OC 2.3

REF

= 0V 0.1 1 µA

CM431

p Max

2 4

0.4 1 mA

0.2 0.5 Ω

CM431A

= 25°C.

A

Units

µA

2004/08/27 Champion Microelectronic Corporation Page 5