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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
GENERAL DESCRIPTION
The CM431L is a low voltage three terminal adjustable shunt regulator with thermal stability guaranteed over temperature. The output voltage can be adjusted to any value from 1.24V VREFto 20V with two external resistors. The CM431L has a typical dynamic output impedance of 0.25. Active output circuitry provides a very sharp turn on characteristic, making the CM431L an excellent replacement for zener diodes. The CM431L shunt regulator is available in four voltage tolerances0.5%, 0.7%, 1.0% and 2.0%and four package options (SOT-23-3, SOT-23-5, SOT-89, TO-92, and SOP-8). Four voltage tolerances allow the designer the opportunity to select the proper cost/tolerance for their application.
FEATURES
LOW voltage operation1.24V Adjustable output voltage V0 = VREF to 20V Wide operating current range 60A to 100mA LOW dynamic output impedance 0.25 typ. Trimmed bandgap design 0.5%
APPLICATIONS
Linear Regulators Adjustable Supplies Switching Power Supplies Battery Operated Computers Instrumentation Computer Disk Drivers
PIN CONFIGURATION
TO-92 Front View
CATHODE
SOT-23-3 Top View
3
REF
ANODE
Pin 1 Pin 2 Pin 3
CM431LXCM233 REF CATHODE ANODE
CM431LXCM2R3 CATHODE REF ANODE
Suffix "X": Grade "A", "B", "C", or "D"
1
1 2 3
2
SOT-23-5 Top View
5 4
SOT-89
Top View
1
SOP-8 Top View
C OE ATH D N C N C N C
R EF N C AN D OE N C
8 7 6 5
CATHODE REF
CATHODE
ANODE
REF
ANODE
2 3 4
NC
NC
1
2
3
1
2
3
2006/02/10 Rev. 5
Champion Microelectronic Corporation
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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
BLOCK DIAGRAM
BLOCK DIAGRAM SYMBOL DIAGRAM
Cathode
Ref
Anode
2006/02/10 Rev. 5
Champion Microelectronic Corporation
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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
ORDERING INFORMATION
PACKAGE 0.5% SOT-23-31 SOT-23-31 SOT-23-51 SOT-891 TO-922 SOP-8 SOT-23-31 CM431LACM233 CM431LACM2R3 CM431LACM235 CM431LACM89 CM431LACN CM431LACS 0.7% CM431LDCM233 CM431LDCM2R3 CM431LDCM235 CM431LDCM89 CM431LDCN CM431LDCS TOLERANCE 1.0% CM431LBCM233 CM431LBCM2R3 CM431LBCM235 CM431LBCM89 CM431LBCN CM431LBCS CM431LGBCM233* CM431LGBCM2R3* CM431LGBCM235* CM431LGBCM89* CM431LGBCN* CM431LGBCS* 2.0% CM431LCCM233 CM431LCCM2R3 CM431LCCM235 CM431LCCM89 CM431LCCN CM431LCCS CM431LGCCM233* CM431LGCCM2R3* CM431LGCCM235* CM431LGCCM89* CM431LGCCN* CM431LGCCS* TR=3K TR=3K TR=3K TR=1K TA=2K T/R Quantity TR=3K TR=3K TR=3K TR=1K TA=2K
CM431LGACM233* CM431LGDCM233*
SOT-23-31 CM431LGACM2R3* CM431LGDCM2R3* SOT-23-51 SOT-891 TO-922 SOP-8 Notes 1 Add suffix TRfor Tape & Reel. 2 Add suffix TAfor Tape Ammo. 3 CM431LGACM235* CM431LGDCM235* CM431LGACM89* CM431LGACN* CM431LGACS* CM431LGDCM89* CM431LGDCN* CM431LGDCS*
*Note: Add suffix "G" for Pb Free Product
2006/02/10 Rev. 5
Champion Microelectronic Corporation
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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
ABSOULTE MAXIMUM RATINGS
Parameter Cathode Voltage Continuous Cathode Current Reference Current Operating Junction Temperature Range Storage Temperature Range Thermal Resistance TO-92 SOT-23-3 SOT-23-5 SOT-89 SOP-8 Power Dissipation at TA =25 TO-92 SOT-23-3 SOT-23-5 SOT-89 SOP-8 Lead TemperatureSoldering10 seconds TLEAD PD 0.78 0.30 0.30 1.00 0.71 250 W Symbol VZ IZ IREF TJ TSTG JA 160 410 256 110 175 Maximum 20 100 3 -40 to +150 -65 to + 150 Units V mA mA /W
RECOMMENDED OPERATING CONDITION
Min Cathode Voltage. Vz Cathode Current. Iz Operating Temperature VREF 80 0 Max 16 100 105 Symbol V mA
2006/02/10 Rev. 5
Champion Microelectronic Corporation
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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
ELECTRICAL CHARACTERISTICS
Parameter Reference Voltage VREF Temp Deviation Ratio of Change in VREF to Change in Cathode Voltage Reference Input Current IREF Temp Deviation Off State Cathode Current Dynamic Output Impedance Minimum Operating Current Unless specified, TA = 25
CM431L 0.5% CM431L 0.7% Symbol Condition MIN TYP MAX MIN TYP MAX UNITS VREF Vz=VREF , TA=25 1.234 1.240 1.246 1.231 1.240 1.249 Iz=10mA V 1.258 1.222 1.258 TA=-40 to+85 1.222 VDEV TA=-40 to +85, Vz= VREF Iz=10mA 10 25 10 25 mV
VREF Iz=10mA, VZ=16V to VREF -1.0 Vz IREF R1=10k, R2=, Iz=10mA 0.15 IREFDEV TA=-40 to +85 R1=10 k R2= , Iz=10mA Izoff rz VZ=6V VZ=16V f < 1KHz, VZ= VREF Iz=100A to 100 mA VREF=0V 0.5 0.15 0.5 -2.7 -1.0 -2.7 mV/V
A
0.1 0.5 0.5 0.25 60
0.4 2.0 2.0 0.4 80
0.1 0.5 0.5 0.25 60
0.4 2.0 2.0 0.4 80
A A
A
IZmin VZ= VREF
2006/02/10 Rev. 5
Champion Microelectronic Corporation
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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
ELECTRICAL CHARACTERISTICS (CONTINUED)
Parameter Reference Voltage VREF Temp Deviation Ratio of Change in VREF to Change in Cathode Voltage Reference Input Current IREF Temp Deviation Off State Cathode Current Dynamic Output Impedance Minimum Operating Current Unless specified, TA = 25
CM431L 1% CM431L 2% Symbol Condition MIN TYP MAX MIN TYP MAX VREF Vz=VREF , TA=25 1.228 1.240 1.252 1.215 1.240 1.265 Iz=10mA 1.265 1.200 1.280 TA=-40 to+85 1.215 VDEV TA=-40 to +85, Vz= VREF Iz=10mA 10 25 10 35
UNITS V
mV
VREF Iz=10mA, VZ=16V to VREF -1.0 Vz IREF R1=10k, R2=, Iz=10mA 0.15 IREFDEV TA=-40 to +85 R1=10 k R2= , Iz=10mA Izoff rz VREF=0V VZ=6V VZ=16V f < 1KHz, VZ= VREF Iz=100A to 100 mA 0.5 0.15 0.5 -2.7 -1.0 -2.7 mV/V
A
0.1 0.5 0.5 0.25 60
0.4 2.0 2.0 0.4 80
0.1 0.5 0.5 0.25 60
0.4 2.0 2.0 0.4 60
A A
A
IZmin VZ= VREF
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Champion Microelectronic Corporation
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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
TYPICAL CHARACTERISTICS
Cathode Current vs. Cathode Voltage 300 200 100 0 -100 -200 -300 -1 -0.5 0 Vz(V) 0.5 1 1.5 Iz(mA) Iz(uA) 150 100 50 0 -50 -100 -150 -1.5 Vz=VREF TA=25 -1 -0.5 0 Vz(V) 0.5 1 1.5 Cathode Current vs. Cathode Voltage
Reference Voltage vs. Junction Temperature 1.248 1.246 1.244 VREF(V) Iz=10mA
Reference Input Current vs. Junction Tem perature 150 125 IREF(nA) 100 75 50 -50
1.242 1.24 1.238 1.236 1.234 -50 -25 0 25 50 TJ() 75 100 125 150 Iz=80uA
-25
0
25
50 TJ( )
75
Iz=10mA R1=10k R2= 100 125 150
Ratio of Delta Ref. Voltage to Delta Cathode Voltage vs. Junction Tem perature 1.2 1.1 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -50
250 200 Iz(off) (nA) 150 100 50 0
Off State Cathode Current vs. Junction Temperature
VREF = 0V
VREF/ Vz(-mV/V)
Iz=10mA Vz=16V to VREF -25 0 25 50 TJ( ) 75 100 125 150
-50
-25
0
25
50 TJ()
75
100
125
150
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Champion Microelectronic Corporation
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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
TYPICAL CHARACTERISTICS (Conti)
Stability Boundary Condition
3.5 3 2.5 2 1.5 1 0.5 0
50 PF 0. 00 2u F 0. 00 5u F 0. 00 8u F 0. 02 uF 0. 05 uF 0. 08 uF 0. 2u F 0. 5u F 0. 8u F
Iz (mA)
CL
2006/02/10 Rev. 5
Champion Microelectronic Corporation
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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
APPLICATION CIRCUIT
Notes for Application Circuit 1) Set VOUT according to the following equation
VOUT =VREF ( 1 + R1/R2 ) +IREF R1 2) Choose the value for R as follows
* The maximum limit for R should be such that the cathode current, Iz, is greater than the minimum operating current80Aat VINmin. * The minimum limit for R should be such that Iz does not exceed 100mA under all load conditions, and the instantaneous turn-on value for Iz does not exceed 150mA. Both of the following conditions must be met Rmin
VINmax 150mA
to limit instantaneous turn-on Iz
Rmin
VINmax-VOUT
to limit Iz under normal operating conditions
IOUTmin+ 100mA
2006/02/10 Rev. 5
Champion Microelectronic Corporation
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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
PACKAGE DIMENSION
TO-92
A A1 b D D1
A
E L e
1
E
L
A1
b
D
e
3-Pin Plastic TO-92 Carrier Dimensions
2006/02/10 Rev. 5
Champion Microelectronic Corporation
1
D1
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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
PACKAGE DIMENSION (CONTINUED)
SOT-23-3
D
3
b1 c1
With Plating
A
c
A1 A2
E1
b
Base Metal
Section B-B
E
b b1 c c1 D E
1
e e1
2
E1
b
L L1 e e1
1
1 2
A2
A
2
A1
See Section B-B
SOT-23-5
D
5 4
b1 c1
With Plating
A
L L1
c
A1 A2
E1
b
Base Metal
Section B-B
E
b b1 c c1 D E
1
e
2
3
E1
e1
b
L L1 e e1
1
1 2
A2
A
2
A1
See Section B-B
2006/02/10 Rev. 5
Champion Microelectronic Corporation
L L1
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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
PACKAGE DIMENSION (CONTINUED)
SOT-89
D D1
1.0
E
H
L
5
C e e1
8
A L b b1 C D D1 H E e1
b
b1
b
e
8-PIN SOP (S08)
PIN 1 ID
2006/02/10 Rev. 5
Champion Microelectronic Corporation
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CM431L
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
IMPORTANT NOTICE
Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. CMC integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. customer should provide adequate design and operating safeguards. Use of CMC products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer's applications, the
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2006/02/10 Rev. 5
Champion Microelectronic Corporation
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