ADMOS AMS421BM1 0.5v shunt regulator Datasheet

Advanced
Monolithic
Systems
AMS421
0.5V SHUNT REGULATOR
RoHS compliant
FEATURES
APPLICATIONS
• Trimmed 0.5% Tolerance
• Wide Operating Current Range 0.1µA to 10mA
• Low Reference Input Current 1.5nA
• Low Dynamic Output Impedance
• Low Output Noise
• Nominal Temperature Range to 125°C
• Temperature-Compensated: 50ppm/°C
• Low supply current: typ. 10µA
• Battery Powered Systems
• Switching Power Supplies
• Isolated Power Supplies
• Telecommunications
• Error Amplifiers
• Notebook/Personal Computer
• Monitors/ VCR/ TV
• Opto-isolator 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 0.5% 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:
TOL.
Package
5 LEAD SOT-23
AMS421AM1
AMS421BM1
AMS421CM1
±0.5%
±1.0%
±2.0%
PIN CONNECTIONS
OPERATING
TEMP. RANGE
-40 to + 125°C
-40 to + 125°C
-40 to + 125°C
5L SOT-23
(M1)
VCC 1
5 COLL
GND 2
BLOCK DIAGRAM
N/C 3
4 REF
VCC
1
Top View
5
Ref
4
Co
+
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)
15V
10mA
0.5mA
-40°C to +125°C
Storage temperature
Lead Temperature (Soldering, 10sec.)
-65°C to +150°C
265°C
Internal Power Dissipation (PD)
SOT-23-5 Package
0.3 W
Thermal Resistance (θJA)
SOT-23-5 Package
410°C/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 = +25°C unless otherwise noted.
Parameter
Conditions
Min
Reference Voltage
497.5
AMS421A
Typ
Max
505.0
2.5
0.5
0.5
1.0
ICOL = 0.1µA to
10mA
0.5
Reference Input
Current Deviation over
Temperature
ICOL = 0.1µA to
10mA
Off State Collector
Current
Reference Input
Current
Dynamic Output
Impedance
Units
mV
3
0.5
5
mV
0.5
1.5
0.5
2
mV
5
0..5
5
0.5
5
0.1
0.7
0.1
0.7
0.1
0.7
VREF = 0V
0.04
0.1
0.04
0.1
0.04
0.1
nA
f < 1KHz,
0.35
0.5
0.35
0.5
0.35
0.5
Ω
0.1
nA
20
µA
ICOL = 100µA
490.0
AMS421C
Typ
Max
510.0
Change in Reference
Voltage to Supply
Voltage
0.5
495.0
Min
500.0
VCOL = VREF
TA = -40°C to
+125°C
502.25
AMS421B
Typ
Max
500.0
Deviation of Reference
Voltage over
Temperature
500.0
Min
Vcc=1.4V to 15V
nA
nA
TA = Full Range
ICOL =1 nA to 10mA
Minimum Operating
Current
VCOL = VREF
Input Supply Current
ICOL = 100 µA
0.1
15
20
0.1
15
20
15
RECOMMENDED OPERATING CONDITIONS:
Collector Voltage, (VCOL)
Collector Current, (ICOL)
Min
VREF
1µA
Advanced Monolithic Systems, Inc.
Max
15 V
10mA
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS421
TYPICAL APPLICATIONS
1.5V ≤ VCC ≤ 15V
1.5V to 15V
0.1µF
10K
1
5
VO
1.000V
Ref
4
+
0.47µF
100K
100K
0.5V
500 pF
2
LOW NOISE PRECISSION 1.000V REFERENCE
2.5V ≤ VCC ≤ 15V
VO
Q1
0.1µ
R3
1
5
4
+
R1
0.47µF
-
Co
0.5V
R2
2
GND
Low cost LDO using an External PNP
Set the VOUT according to the following equation:
R1 ⎞
⎛
VOUT = VREF⎜1 +
⎟ + IREFR1
R2 ⎠
⎝
Maximum output current is (PNP Hfe)10mA. The transistor current rating and package depends of the application dropout.
The power dissipation for the PNP transistor is Iout (Vin-Vout). The package type should be selected according to the Power
dissipation.
Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS421
TYPICAL PERFORMANCE CHARACTERISTICS
Vout change
Output resistance Vs load
Output voltage vs. Supply voltage @ 100 µA
1
0.6
0.8
0.5
mV
0.6
0.4
Vout change
0.4
0.3
0.2
0.2
0
0.1
output res
0
-0.2
0
5
10
0
15
2
4
Supply Current vs Input Voltage @100uA
load
uA
20
IVcc uA
15
uA
25
10
5
0
10
8
10
Supply current vs load
30
0
6
Load step mA
Vcc
20
30
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
Volts
Ivcc uA
Load
Very low current regulation
Input output transfer characteristic
0.51
0.9
0.8
0.7
0.5
Vout
0.495
Volts ouptut
Volts
0.505
0.6
0.5
Vout
0.4
0.3
0.2
0.49
1.00E- 1.00E- 1.00E- 1.00E- 1.00E- 1.00E- 1.00E09
08
07
06
05
04
03
0.1
0
0
Advanced Monolithic Systems, Inc.
1
2
3
4
5
Volts input
load
www.advanced-monolithic.com
Phone (925) 443-0722
Fax (925) 443-0723
AMS421
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Output rejection Load 1k /10n
PSRR
-30
0
-35
-10
-40
-20
Vout
-40
dB
dB
-45
-30
Vout
-50
-55
-50
-60
-60
-65
-70
1.00E+03
-70
10
100
1000
10000
100000 1000000
1.00E+04
1.00E+05
1.00E+06
Hz
Hz
Input Bias Current
6
5
nA
4
3
Ibias
2
1
0
5
10
15
20
Volts
2 mA load Transient @ VCC=5V, Output Cap=10 nF
2 mA load Transient at VCC=15V, Output Cap=10nF
Advanced Monolithic Systems, Inc.
Fast Start up 0-2V with common supply
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)
0.014-0.020
(0.350-0.50)
0.037
(0.95)
TYP
0.018-0.024
(0.457-0.610)
10°
NOM
0.036-0.051
(0.090-1.30)
0.0035-0.0080
(0.090-0.20)
0.003
(0.150)
MAX
Advanced Monolithic Systems, Inc.
0.075
(1.90)
TYP
www.advanced-monolithic.com
10°
NOM
0.018-0.024
(0.457-0.610)
(SOT-23-5 ) AMS DRW# 051001
Phone (925) 443-0722
Fax (925) 443-0723
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