Transcript
Advanced Monolithic Systems
AMS255 MICROPOWER SHUNT VOLTAGE REFERENCE
RoHS compliant FEATURES
APPLICATIONS
• Low Temperature Coefficient • Low Output Noise • Operating Current 100µA to 5mA • Low Dynamic Impedance • Tight Output Voltage Tolerance • Available in the sub-miniature SOT-23 Package
• Battery Powered Systems • Instrumentation • Energy Management • Automotive • Precision Audio Components • 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. TEMPCO 50ppm/°C 100ppm/°C
PACKAGE TYPE 3 LEAD SOT-23 AMS255AM AMS255BM
OPERATING TEMP. RANGE -40 to +85°C -40 to +85°C
PIN CONNECTIONS 3L SOT-23 (M) 3 *
1 +
2 -
*This pin must be left floating or connected to pin 2
Top View
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS255 ABSOLUTE MAXIMUM RATINGS (Note 1) Reverse Current Forward Current Lead Temperature (25 sec)
10mA 10mA 265°C
Storage temperature Internal Power Dissipation (PD) SOT-23 Package Thermal Resistance (θJA) SOT-23 Package
-65°C to +150°C 0.28W 410°C/W
ELECTRICAL CHARACTERISTICS Electrical Characteristics at IR =1000 µA and TA = +25°C unless otherwise specified. Parameter
Conditions
Output Voltage
Min. 2.475
Output Impedance RMS Noise Voltage
10Hz ≤ f ≤ 10kHz
Temperature Coefficient
TA = Full Range
Turn-On Settling Operating Current
2.500
2.525
0.6
2
Min.
AMS255B Typ. Max.
2.450
15
2.550
V
0.6
2
Ω µVrms
30 100
30 5
0.1
ppm/°C µsec
30
0.1
Units
2.500
60
0.1% of VOUT (Note 3)
AMS255A Typ. Max.
5
mA
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 TA = TJ = 25°C. Note 3: Optimum performance is obtained at currents below 1000µA.
TYPICAL APPLICATIONS Precision ± 2.500V Reference
Shunt Regulator VS
RS
+5V ±5%
IL
VR AMS255
904Ω, 1%
IQ + IL
IQ
+2.500V AMS255
47kΩ, 0.1% 47kΩ, 0.1% +5V 0.1µF
1/2 LMC6062
-2.500V
+
0.1µF -5V
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS255 TYPICAL APPLICATIONS Precision 1µA to 1mA Current Sources AMS255
12V AMS255
R1 20k
2
-
R1 20k
8 1/2 LMC6062
3
2
4
+
IOUT*
-
8 1/2 LMC6062 3 4 +
1
R2
IOUT*
-1.0V TO -12V
1
R2
1.0V TO 12V -15V
IOUT=2.5V/R2
TYPICAL PERFORMANCE CHARACTERISTICS
Reverse Characteristics and Minimum Operating Current
Temperature Drift for Different Average Temperature Coefficient
+0.2
+12ppm/° C
+0.1 0 -0.1 -22ppm/° C
-0.3 -51ppm/° C
IR = 200µ A
TJ =25° C
80 60 40 20
100
2 6 8 4 REVERSE VOLTAGE (V)
0.5
1
10
1k 10k 100 FREQUENCY (Hz)
100k
Ouput Impedance vs Frequency
100
IMPEDANCE (Ω)
IMPEDANCE (Ω)
10
1k
IR= 100mA TJ =25° C, ∆IR= 0.1IR
CL= 0 CL= 1µF TANTALUM
10
1.0
0.1 0
Ouput Impedance vs Frequency 1k
2.0
0.2
0 0 20 40 60 80 TEMPERATURE ( ° C)
TJ =25° C
5.0
100 NOISE (mV/√Hz)
REVERSE CURRENT ( µA)
VR CHANGE (%)
+0.3
-0.4 -0.5 -40 -20
10
IR = 150µ A
+0.4
-0.2
Noise Voltage vs Frequency
120
+0.5
1
IR= IRMIN+100µA TJ =25° C, ∆IR= 0.1IR
CL= 0
100
CL= 1µF TANTALUM
10
1
XCL
XCL
0.1
0.1 100
1k 10k 100k FREQUENCY (Hz)
Advanced Monolithic Systems, Inc.
1M
www.advanced-monolithic.com
100
1k 10k 100k FREQUENCY (Hz)
Phone (925) 443-0722
1M
Fax (925) 443-0723
AMS255 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)
0.018-0.024 (0.457-0.610)
10° NOM
0.035-0.041 (0.089-1.041) 0.0034-0.0050 (0.086-0.127) 0.0005-0.0040 (0.013-0.102)
0.070-0.080 (1.778-2.032)
10° NOM
0.018-0.024 (0.457-0.610) (SOT-23 ) AMS DRW# 051991
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
