Advanced Monolithic Systems AMS3431 Service Manual

http://www.BDTIC.com/AMS

Advanced AMS3431

Monolithic PRECISION ADJUSTABLE SHUNT REGULATOR
Systems

RoHS compliant

FEATURES APPLICATIONS

• Trimmed 0.25% Reference • Battery Powered Systems

• Wide Operating Current Range 250µA to 150mA • Switching Power Supplies

• Low Dynamic Output Impedance • Adjustable Power Supplies

• Low Output Noise • Linear Regulators

• Nominal Temperature Range to 85°C • Error Amplifiers

• Temperature-Compensated: 60ppm/°C • Notebook/Personal Computer

• Internal Amplifier with 150mA Capability • Monitors/ VCR/ TV

GENERAL DESCRIPTION

The AMS3431 is a three-terminal adjustable shunt regulator with guaranteed temperature stability over the entire range of
operation. The output voltage can be set to any value between 2.5V (VREF) and 36V by adding two external resistors. Due to
the sharp turn-on characteristics this device is an excellent replacement for zener diodes in many applications.
AMS3431 is available in the space saving SOT-23 package and in the TO-92 package.

ORDERING INFORMATION:

TOL. PACKAGE TYPE OPERATING

TO-92 3 LEAD SOT-23

±0.25%
±0.5%
±1.0%

AMS3431AN AMS3431AM
AMS3431BN AMS3431BM
AMS3431CN AMS3431CM

TEMPERATURE RANGE

PIN CONNECTIONS

TO-92 3L SOT-23

Plastic Package (N) (M)

123

• Pagers

-40 to +85° C

-40 to +85° C

-40 to +85° C

ANODE

CATHODE

ANODE

Bottom View Top View

Advanced Monolithic Systems, Inc.

REF

CATHODE REF

AMS3431

http://www.BDTIC.com/AMS

ABSOLUTE MAXIMUM RATINGS (Note 1)

Cathode Voltage (VZ) 37V Internal Power Dissipation (PD)
Continuous Cathode Current (I
Reference Input Current (I
Junction Temperature (T
Storage Temperature
Lead Temperature (Soldering, 25sec.)

Note 1:

Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the

device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical
Characteristics

. The guaranteed specifications apply only for the test conditions listed.

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at IZ =10 mA and TA = +25°C unless otherwise specified.

Parameter

Reference Voltage 2.489 2.495 2.501 2.483 2.495 2.507 2.470 2.495 2.520 V

Conditions

) -10mA to +150mA TO-92 Package 0.78W

Z

) 10mA SOT-23 Package 0.28W

REF

)

J

-40°C to +125°C

-65°C to +150°C
265°C

AMS3431A

Min Typ Max

Thermal Resistance (ϕ
TO-92 Package
SOT-23 Package

AMS3431B

Min Typ Max

)

JA

AMS3431C

Min Typ Max

160°C/W
410°C/W

Units

Deviation of Reference
Input Voltage over
Temperature

Ratio of Change in
Reference Voltage to

Cathode Voltage
Reference Input

Current

Reference Input
Current Deviation over
Temperature

Off State Cathode
Current

Dynamic Output
Impedance

Minimum Operating
Current

= V

V
T
T

V
V

R1 =10kΩ, R2 = ∞Ω
(test circuit 2)

R1 =10kΩ, R2 = ∞Ω
T

(test circuit 2)
VZ = 36V, V

0V
( test circuit 3)

f < 1KHz, VZ = V
IZ =100µA to 100mA

(test circuit 1)
VZ = V

(test circuit 1)

(circuit 1)

Z

REF

= +25°C to +85°C

A

= -40°C to +25°C

A

from V

Z

from V

Z

= Full Range

A

to 10V

REF

to 36V

REF

REF

REF

=

REF

0.5 4.0 0.5 4.0 0.5 4.0

0.4 1.2 0.4 1.2 0.4 1.2

0.04 0.5 0.04 0.5 0.04 0.5

0.25 0.5 0.25 0.5 0.25 0.5

100 250 100 250 100 250

8.0

8.0

-0.5

-1.0

15
15

-2.7 -0.5 -2.7 -0.5 -2.7 mV/V

-2.0 -1.0 -2.0 -1.0 -2.0 mV/V

8.0

8.0

15
15

RECOMMENDED OPERATING CONDITIONS:

Min Max

Cathode Voltage, (VZ) V
Cathode Current, (IZ) 0.25mA 120mA

36 V

REF

8.0

8.0

15
15

mV
mV

µA

µA

µA

Ω

µA

Advanced Monolithic Systems, Inc.