S-1740 Datasheet, PDF (21/47 Pages) ABLIC Inc. – 5.5 V INPUT, 100 mA VOLTAGE REGULATOR WITH SUPPLY VOLTAGE DIVIDED OUTPUT

POWER MONITORING OUTPUT, 5.5 V INPUT, 100 mA CMOS VOLTAGE REGULATOR WITH 0.5 μA SUPER LOW CURRENT CONSUMPTION
Rev.1.1_00
S-1740/1741 Series
 Typical Application in S-1740/1741 Series A / C Type
Figure 20 shows the circuit diagram of the typical application in the S-1740/1741 Series A / C type, and Figure 21 shows
the timing chart.
As shown in Figure 20, connect the PMOUT pin to an analog input pin (AIN pin) of the A/D converter in the
microcontroller. The microcontroller can monitor the battery voltage by inputting the output voltage (V_PMOUT) to the A/D
converter.
The input voltage from the battery is converted to output voltage by the regulator operation, and the microcontroller starts
driving with the voltage. The power monitoring output can be controlled by inputting "H" and "L" signals output from the
microcontroller I/O pin to the PMEN pin. Control the power monitoring output according to the A/D converter operation
timing.
When inputting "H" to the PMEN pin in the S-1740/1741 Series A type, or "L" to the PMEN pin in the C type, the
microcontroller monitors the battery voltage. The IC current consumption can be minimized by inputting "L" to the PMEN
pin in the S-1740/1741 Series A type, or "H" to the PMEN pin in the C type when battery voltage is not monitored.
Battery
C_IN
S-1740/1741 Series
A / C type
VIN
VOUT
PMEN
PMOUT
VSS
C_L
C_PM
Microcontroller
VDD
A/D
converter
AIN
I/O
VSS
Example of active "H"
V_PMEN
V_PMOUT
Figure 20
tPU
V_PMOUT(S) + V_POF
Voltage monitoring timing
Figure 21
tPU
tPU
21