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Advanced Monolithic Systems
FEATURES
* Trimmed 0.25% Tolerance * Wide Operating Current Range 0.1A to 10mA * Low Reference Input Current 1.5nA * Low Dynamic Output Impedance * Low Output Noise * Nominal Temperature Range to 125C * Temperature-Compensated: 50ppm/C * Low supply current: typ. 10A
AMS421
0.5V SHUNT REGULATOR
RoHS compliant
APPLICATIONS
* Battery Powered Systems * Switching Power Supplies * Isolated Power Supplies * Telecommunications * Error Amplifiers * Notebook/Personal Computer * Monitors/ VCR/ TV * Optoisolator driver
GENERAL DESCRIPTION
The AMS421 is a four-terminal adjustable open collector shunt regulator with guaranteed temperature stability over the entire range of operation. The output voltage can be set to any value between 0.5V (VREF) and 15V by adding two external resistors. The AMS421 features 0.25% initial tolerance, low dynamic output impedance and operates over a wide current range. Due to the sharp turn-on characteristics this device is an excellent replacement for Zener diodes in many applications. AMS421 is available 5 pin SOT-23 packages.
ORDERING INFORMATION:
PIN CONNECTIONS
TOL. 0.25% 0.5% 1.0%
Package 5 LEAD SOT-23 AMS421AM1 AMS421BM1 AMS421CM1
OPERATING TEMP. RANGE -40 to + 125C -40 to + 125C -40 to + 125C
5L SOT-23 (M1)
VCC 1 GND 2
5 COLL
BLOCK DIAGRAM
VCC 1 5 Ref 4 Co
N/C 3
4 REF
Top View
+
0.5V
2 GND
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS421
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (VCC) Continuous Collector Current (IC) Reference Input Current (IREF) Junction Temperature (TJ) Storage temperature Lead Temperature (Soldering, 10sec.) 15V 10mA 0.5mA -40C to +125C -65C to +150C 265C Internal Power Dissipation (PD) SOT-23-5 Package Thermal Resistance (JA) SOT-23-5 Package 410C/W 0.3 W
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 ICOL =1 mA and TA = +25C unless otherwise noted. Parameter
Reference Voltage Deviation of Reference Voltage over Temperature Change in Reference Voltage to Supply Voltage Reference Input Current Reference Input Current Deviation over Temperature Off State Collector Current Dynamic Output Impedance Minimum Operating Current Input Supply Current VCOL = VREF TA = -40C to +125C ICOL = 100A Vcc=1.4V to 15V ICOL = 0.1A to 10mA ICOL = 0.1A to 10mA TA = Full Range VREF = 0V f < 1KHz, ICOL =1 nA to 10mA VCOL = VREF ICOL = 100 A 15 0.1 20 15 0.1 20 15 0.1 20 nA A 0.04 0.35 0.1 0.5 0.04 0.35 0.1 0.5 0.04 0.35 0.1 0.5 nA 0.5 5 0..5 5 0.5 5 nA
Conditions
Min
498.75
AMS421A Typ Max
500.00 0.5 501.25 2.5
Min
497.50
AMS421B Typ Max
500.00 0.5 502.25 3
Min
495.00
AMS421C Typ Max
500.00 0.5 505.00 5
Units
mV mV
0.5
1.0
0.5
1.5
0.5
2
mV
0.1
0.7
0.1
0.7
0.1
0.7
nA
RECOMMENDED OPERATING CONDITIONS:
Collector Voltage, (VCOL) Collector Current, (ICOL) Min VREF 1A Max 15 V 10mA
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS421
TYPICAL APPLICATIONS
1.5V VCC 15V
1.5V to 15V
0.1F 1 5 10K
VO 1.000V 100K
Ref 4 + 0.47F
0.5V 100K 500 pF 2
LOW NOISE PRECISSION 1.000V REFERENCE
2.5V VCC 15V VO
Q1 0.1 R3 1 5 4
+
R1 0.47F Co
0.5V
R2 2
GND
Set the VOUT according to the following equation:
R1 VOUT = VREF1 + + IREFR1 R2
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS421
TYPICAL PERFORMANCE CHARACTERISTICS
Output voltage vs. Supply voltage @ 100 A
1 0.8 0.6 mV 0.4 0.2 0 -0.2 0 5 Vcc 10 15 Vout change 0.6 0.5 0.4 0.3 0.2 0.1 0 0 2
Vout change
Output resistance Vs load
output res
4
6
8
10
Load step mA
Supply Current vs Input Voltage @100uA load
30 25 uA 20 uA 15 10 5 0 0 10 Volts 20 30 IVcc uA
Supply current vs load
200 180 160 140 120 100 80 60 40 20 0 1.00E-06 1.00E-05 1.00E-04 1.00E-03 1.00E-02 Load
Ivcc uA
Very low current regulation
0.51 0.505
Volts ouptut 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0
Input output transfer characteristic
Volts
0.5 0.495 0.49 1.00E- 1.00E- 1.00E- 1.00E- 1.00E- 1.00E- 1.00E09 08 07 06 05 04 03 load
Vout
Vout
1
2
3
4
5
Volts input
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS421
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Output rejection Load 1k /10n
-30 -35 -40 -45
dB
PSRR
0 -10 -20
dB
-30 Vout -40 -50 -60 -70 10 100 1000 Hz 10000 100000 1000000
-50 -55 -60 -65 -70 1.00E+03 1.00E+04 Hz 1.00E+05 1.00E+06
Vout
Input Bias Current
6 5 4 nA 3 2 1 0 5 10 Volts 15 20 Ibias
2 mA load Transient @ VCC=5V, Output Cap=10 nF
2 mA load Transient at VCC=15V, Output Cap=10nF
Fast Start up 0-2V with common supply
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS421
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Slow Start up 0-2V with common supply
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS421
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
5 LEAD SOT-23 PLASTIC PACKAGE (M1)
0.110-0.120 (2.794-3.048)
0.102-0.118 (2.60-3.00) 0.059-0.070 (1.50-1.75)
0.037 (0.95) TYP 0.018-0.024 (0.457-0.610)
0.014-0.020 (0.350-0.50)
10 NOM
0.036-0.051 (0.090-1.30) 0.0035-0.0080 (0.090-0.20) 0.003 (0.150) MAX 0.075 (1.90) TYP 10 NOM 0.018-0.024 (0.457-0.610)
(SOT-23-5 ) AMS DRW# 051001
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723

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