SS432G Datasheet PDF - Silicon

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SS432G
Silicon

Part Number SS432G
Description Adjustable Precision Shunt Regulator
Page 7 Pages


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SS432G
Adjustable Precision Shunt Regulator
FEATURES
Low voltage operation (1.24V)
Adjustable output voltage from VO = V REF to 12V
Wide operating current range from 55µ A to 100mA
Low dynamic output impedance 0.25typ.
ESD rating is 6kV (per MIL-STD 883D)
Pb-free, RoHS compliant.
APPLICATIONS
Linear Regulators
Adjustable Supplies
Switching Power Supplies
Battery Operated Computers
Instrumentation
Computer Disk Drives
PIN CONFIGURATION
DESCRIPTION
The SS432G is a low-voltage three-terminal adjustable shunt
regulator with a guaranteed thermal stability over the applicable
temperature range. The output voltage can be set to any value
between VREF (approximately 1.24V) to 12V with two external
resistors (see application circuit). This device has a typical output
impedance of 0.25 ohms. Active output circuitry provides very sharp
turn-on characteristics, making this device an excellent
replacement for Zener diodes in many applications.
The SS432G is characterized for operation from 0°C to 105°C,
and three package options (SOT-23, SOT-89, and TO-92) allow
the designer the opportunity to select the proper package for his
application.
BLOCK DIAGRAM
SOT-23 (Top view)
Cathode
Anode
2 Cathode
3
1 Reference
Ref
+
-
SOT-89 (Top view)
3 Cathode
2 Anode
1 Reference
Vref
Anode
TO-92 (Top view)
3 Cathode
2 Anode
1 Reference
SYMBOL
Cathode
Ref.
Anode
Rev.2.20 7/12/2005
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ABSOLUTE MAXIMUM RATINGS over ambient temp. range.
Parameter
Cathode Voltage
Continuous Cathode Current
Reference Current
Operating Junction Temperature
Storage Temperature Range
Thermal Resistance
Lead Temperature (Soldering - std.lead finish)
Symbol
VKA
I KA
IREF
Tj
T STG
θJA
TLEAD
Maximum
12
150
3
150
-45 to +150
160
260°C/10 sec.
SS432/G
Units
V
mA
mA
°C
°C
°C/W
ELECTRICAL CHARACTERISTICS (TA =25°C)
PARAMETER
SYMBOL
TEST
CIRCUIT
TEST CONDITIONS
MIN TYP
MAX  
Reference voltage 1% Vref
1 VKA = Vref IKA = 10mA
1.228 1.240 1.252 V
Deviation of reference voltage
over full temperature range
VI(dev)
Ratio of change in reference
voltage to the change in
cathode voltage
Vref
VKA
Reference current
Iref
Deviation of reference current
over full temperature range
II(dev)
1
2
2
2
VKA = Vref, IKA = 10mA
TA = full range
IKA = 10mA, VKA = Vref to 12V
IKA = 10mA, R1 = 10k, R2 =
IKA = 10mA, R1 = 10kW, R2 =
TA = full range
Minimum cathode current
for regulation
Imin
1
VKA = Vref
Off-state cathode current
Dynamic impedance
Ioff
|ZKA|
3 VKA = 12V, Vref = 0
1
IKA =100µA to 100mA, VKA = Vref
f 1kHz
4 12 mV
-1.5 -2.7 mV/V
0.15 0.5
0.05 0.30
µA
µA
55
0.001
0.25
80
0.1
0.4
µA
µA
Rev.2.20 7/12/2005
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TYPICAL PEFORMANCE CHARACTERISTICS
CATHODE CURRENT
Vs.
CATHODE VOLTAGE












V KA= Vref
TA = 25°C
  
Cathode Voltage (V)

SS432G
CATHODE CURRENT
Vs.
CATHODE VOLTAGE

VKA = Vref
 TA = 25°C








Cathode Voltage (V)

REFERENCE VOLTAGE
Vs.
JUNCTION TEMPERATURE
 





 µ 



      
 !"#!$%& &
REFERENCE INPUT CURRENT
Vs.
JUNCTION TEMPERATURE


 

 






     
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TEST CIRCUITS

 
 

SS432G






 


 
  
 
APPLICATION INFORMATION
  
 
  
 
VMAX
VMIN
VDEV = VMAX-VMIN
T1 TEMPERATURE
T2
Deviation of reference input voltage, V DEV, is defined as
the maximum variation of the reference input voltage
over the full temperature range.
The average temperature coefficient of the reference in-
put voltage, αVREF is defined as:
VREF ppm =
±

VMAX -
VREF(at
V25M°INC)106
=
±

VREFV(DaEt 2V5°C)106
°C T2 T1
T2 T1
Where:
T2T1=full temperature change.
αVREF can be positive or negative depending on
whether the slope is positive or negative.
Example: VDEV= 12.0mV, VREF= 1240mV,
T2T1= 105°C, slope is negative.
αVREF =

12.0mV
1240mV 
106
= − 92ppm/°C
105°C
Note 4. The dynamic output impedance, Rz, is de-
fined as:
RZ
=
VZ
IZ
When the device is programmed with two external re-
sistors, R1 and R2, (see Fig. 2), the dynamic output
impedance of the overall circuit, is defined as:
[ ]rz = V Rz 1+ R1
I R2
Rev.2.20 7/12/2005
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