Datasheet AMS255 Datasheet (Advanced Monolithic Systems)

http://www.BDTIC.com/AMS

Advanced AMS255

Monolithic MICROPOWER SHUNT VOLTAGE REFERENCE
Systems

RoHS compliant

FEATURES APPLICATIONS

• Low Temperature Coefficient • Battery Powered Systems

• Low Output Noise • Instrumentation

• Operating Current 100µA 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

PIN CONNECTIONS

3L SOT-23

(M)

:

TEMP. RANGE

-40 to +85°C

-40 to +85°C

3 *

21

+-

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

Top View

AMS255

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ABSOLUTE MAXIMUM RATINGS (Note 1)

Reverse Current 10mA Storage temperature
Forward Current 10mA Internal Power Dissipation (P
Lead Temperature (25 sec)

265°C

SOT-23 Package 0.28W

Thermal Resistance (θ

JA

)

D

)

SOT-23 Package

ELECTRICAL CHARACTERISTICS

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

Parameter

Output Voltage 2.475 2.500 2.525 2.450 2.500 2.550 V
Output Impedance

Conditions

AMS255A

Min. Typ. Max.

0.6 2 0.6 2

AMS255B

Min. Typ. Max.

-65°C to +150°C

410°C/W

Units

Ω
RMS Noise Voltage

Temperature Coefficient TA = Full Range

Turn-On Settling 0.1% of V

Operating Current

≤ f ≤ 10kHz

10Hz

(Note 3)

OUT

15 30

60

30 30

0.1 5 0.1 5 mA

100

Note1:

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

Electrical Characteristics

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

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

= 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

904

Ω

, 1%

47kΩ

, 0.1%

0.1

µ

47kΩ

F

+2.500V

, 0.1%

+5V

µV

rms

ppm/°C

µsec

­1/2

LMC6062

+

µ

F

0.1

-5V

-2.500V

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TYPICAL APPLICATIONS

Precision 1µA to 1mA Current Sources

AMS255

R1
20k

2

-

8

-1.0V TO -12V

1/2
LMC6062

3

+

I

*

OUT

-15V

1

4

R2

I

=2.5V/R2

OUT

TYPICAL PERFORMANCE CHARACTERISTICS

Temperature Drift for Different
Average Temperature Coefficient

+0.5
+0.4
+0.3
+0.2
+0.1

0

-0.1

CHANGE (%)

R

-0.2

V

-0.3

-0.4

-0.5

-40 -20 0 20 40 60 80

-22ppm/° C

-51ppm/° C

TEMPERATURE ( ° C)

IR = 150µ A

+12ppm/° C

100

Reverse Characteristics and
Minimum Operating Current

120

100

A)

µ

80

60

40

20

REVERSE CURRENT (

0

2

0

REVERSE VOLTAGE (V)

4

1.0V TO 12V

TJ =25° C

68

AMS255

12V

AMS255

R1
20k

2

­8

1/2
LMC6062

+

I

*

OUT

Noise Voltage vs Frequency

10

5.0

Hz)

2.0

√

1.0

0.5

NOISE (mV/

0.2

0.1

10

110

FREQUENCY (Hz)

100

43

1

R2

IR = 200µ A
TJ =25° C

1k 10k

100k

Ouput Impedance vs Frequency

1k

100

)

Ω

IR= 100mA
TJ =25° C, ∆IR= 0.1I

10

IMPEDANCE (

1

0.1
100 1k 10k 100k

FREQUENCY (Hz)

R

CL= 0

CL= 1µF
TANTALUM

XC

Ouput Impedance vs Frequency

1k

100

)

Ω

10

IMPEDANCE (

1

L

1M

0.1
100 1k 10k 100k

IR= I

+100µA

RMIN

TJ =25° C, ∆IR= 0.1I

R

FREQUENCY (Hz)

CL= 0

CL= 1µF
TANTALUM

XC

L

1M

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PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.

3 LEAD SOT-23 PLASTIC PACKAGE (M)

0.110-0.120

(2.794-3.048)

0.015-0.017

(0.381-0.432)

0.083-0.098

(2.108-2.489)

0.047-0.055

(1.194-1.397)

0.035-0.040

(0.889-1.016)

AMS255

0.018-0.024

(0.457-0.610)

0.035-0.041

(0.089-1.041)

0.0005-0.0040
(0.013-0.102)

0.070-0.080

(1.778-2.032)

10°

NOM

10°

NOM

0.018-0.024
(0.457-0.610)

0.0034-0.0050
(0.086-0.127)

(SOT-23 ) AMS DRW# 051991