CM431
LOW VOLTAGE ADJUSTABLE SHUNT REGULATOR
APPLICATION INFORMATION
R*
VBATT
VO
VBATT
R1
0.1%
CM431
VO
CM431
VREF
Von ≈ 2V
Voff ≈ VBATT
Input
R2
0.1%
Vth = 2.5V
GND
VO = (1 + R1/R2) × VREF
Note: R should provide 1mA cathode current to the
CM431 of minimum VBATT
Figure 5. Single –Supply Comparator With Temperature
Figure 4. Shunt Regulator
compensated threshold.
VBATT
VO
VBATT
VO
R1
R2
R1
R2
CM431
C
CM431
VO = (1 + R1/R2) × VREF
Figure 7. Crowbar Circuit
Figure 6. High-Current Shunt Regulator
2006/10/11 Rev.1.4
Champion Microelectronic Corporation
Page 7