ADMOS AMS255AM, AMS255BM Datasheet

Advanced AMS255
Monolithic MICROPOWER SHUNT VOLTAGE REFERENCE
Systems

FEATURES APPLICATIONS

•• Low Temperature Coefficient •• Battery Powered Systems

•• Low Output Noise •• Instrumentation

•• Operating Current 100µµA to 5mA •• Energy Management

•• Low Dynamic Impedance •• Automotive

•• Tight Output Voltage Tolerance •• Precision Audio Components

•• Available in the sub-miniature SOT-23 Package •• Data Acquisition Systems

GENERAL DESCRIPTION

The AMS255 is a two-terminal band-gap voltage reference diode featuring low dynamic impedance and good temperature
coefficient, operating over a 100µA to 5mA current range. On-chip trimming is used to provide tight voltage tolerance. Since
the AMS255 band-gap reference uses only transistors and resistors, low noise and good long term stability result. The wide
dynamic operating range allows its use with widely varying supplies with excellent regulation. These voltage references can
be used to make portable meters, regulators or general purpose analog circuitry.
The AMS255 is operational in the full industrial temperature range of -40°C to +85°C and is available in small space saving
SOT-23 package.

ORDERING INFORMATION:

MAX. PACKAGE TYPE OPERATING

TEMPCO

50ppm/°C
100ppm/°C

3 LEAD SOT-23

AMS255AM
AMS255BM

TEMP. RANGE

-40 to +85°C

-40 to +85°C

PIN CONNECTIONS

3L SOT-23

(M)

3 *

21

+ -

*This pin must be left floating
or connected to pin 2

Top View

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]

AMS255

ABSOLUTE MAXIMUM RATINGS (Note 1)

Reverse Current 10mA Storage temperature
Forward Current 10mA Internal Power Dissipation (PD)
Lead Temperature SOT-23 Package 0.28W
SOT-23 packages:
Vapor phase (60 sec)
Infrared (15 sec.)

215°C

220°C

Thermal Resistance (θJA)
SOT-23 Package

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at IR =1000 µA and TA = +25°C unless otherwise specified.

-65°C to +150°C

410°C/W

Parameter Conditions

AMS255A

Min. Typ. Max.

AMS255B

Min. Typ. Max.

Units

Output Voltage 2.475 2.500 2.525 2.450 2.500 2.550 V
Output Impedance 0.6 2 0.6 2
RMS Noise Voltage

10Hz ≤ f ≤ 10kHz
Temperature Coefficient TA = Full Range

Turn-On Settling 0.1% of V

Operating Current

(Note 3)

OUT

0.1 5 0.1 5 mA

15 30

60 100

30 30

Ω

µV

rms

ppm/°C

µsec

Note1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the

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

Note 2: Parameters identified with boldface type apply at temperature extremes. All other numbers apply at T

= TJ = 25°C.

A

Note 3: Optimum performance is obtained at currents below 1000µA.

TYPICAL APPLICATIONS

Shunt Regulator

V

S

IQ + I

R

S

V

R

I

AMS255

Q

+5V ±5%

L

I

L

AMS255

Precision ±± 2.500V Reference

904Ω, 1%

47kΩ, 0.1%

0.1µF

+2.500V

47kΩ, 0.1%

+5V

-

0.1µF

1/2
LMC6062

+

-5V

-2.500V

Advanced Monolithic Systems, Inc. 6680B Sierra Lane, Dublin, CA 94568 Phone [phone] Fax [phone]