Advanced Monolithic Systems AMS255 Service Manual
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
http://www.BDTIC.com/AMS
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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