CS8182
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5
CIRCUIT DESCRIPTION
ENABLE Function
By pulling the V
REF
/ENABLE lead below 2.0 V typically,
(see Figure 10 or Figure 11), the IC is disabled and enters a
sleep state where the device draws less than 55 mA from
supply. When the V
REF
/ENABLE lead is greater than 2.75 V,
V
OUT
tracks the V
REF
/ENABLE lead normally.
Output Voltage
The output is capable of supplying 200 mA to the load
while configured as a similar (Figure 7), lower (Figure 9), or
higher (Figure 8) voltage as the reference lead. The Adj lead
acts as the inverting terminal of the op amp and the V
REF
lead as the non−inverting.
The device can also be configured as a high−side driver as
displayed in Figure 12.
Figure 7. Tracking Regulator at the Same Voltage
V
IN
V
OUT
GND
GND
V
REF
/
GND
GND
Adj
ENABLE
Loads
5.0 V
B+
C1*
1.0 mF
C2**
10 mF
V
OUT
, 200 mA
V
OUT
+ V
REF
Figure 8. Tracking Regulator at Higher Voltages
V
IN
V
OUT
GND
GND
V
REF
/
GND
GND
Adj
ENABLE
Loads
V
RE
B+
C1*
1.0 mF
C2**
10 mF
OUT
R
A
R
F
V
OUT
+ V
REF
(1 )
R
E
R
A
)
CS8182
CS8182
C3***
10 nF
C3***
10 nF
Figure 9. Tracking Regulator at Lower Voltages
V
IN
V
OUT
GND
GND
V
REF
/
GND
GND
Adj
ENABLE
Loads
V
REF
B+
C1*
1.0 mF
C2**
10 mF
V
OUT
, 200 mA
V
OUT
+ V
REF
(
R2
R1 ) R2
)
R2
R1
Figure 10. Tracking Regulator with ENABLE Circui
V
IN
V
OUT
GND
GND
V
REF
/
GND
GND
Adj
ENABLE
from MCU
V
RE
B+
C1*
1.0 mF
C2**
10 mF
OUT
R
CS8182
CS8182
C3***
10 nF
C3***
10 nF
Figure 11. Alternative ENABLE Circuit
V
IN
V
OUT
GND
GND
V
REF
/
GND
GND
Adj
ENABLE
10 mF
Figure 12. High−Side Driver
V
IN
V
OUT
GND
GND
V
REF
/
GND
GND
Adj
ENABLE
MCU
B+200 mA
V
OUT
+ B )*V
SAT
** C2 is required for stability.
* C1 is required if the regulator is far from the power source filter.
CS8182
CS8182
5.0 V
I/O
NCV8501
.0 V−40 V
V
IN
100 nF
V
REF
(5.0 V)
mC
To Load
(e.g. sensor)
C1*
1.0 mF
C3***
10 nF
C3***
10 nF
*** C3 is recommended for EMC susceptibility.
