s-1200b23-a6t1s Seiko Instruments Inc., s-1200b23-a6t1s Datasheet - Page 13

• Manufacturer Part Number: s-1200b23-a6t1s
• Description: High Ripple-rejection Low Dropout Low Input-and-output Capacitance Cmos Voltage Regulator
• Manufacturer: Seiko Instruments Inc.

Rev.4.1
Operation
1. Basic operation
2. Output transistor
Figure 13 shows the block diagram of the S-1200 Series.
The error amplifier compares the reference voltage (V
divided by feedback resistors R
to ensure a certain output voltage free of any fluctuations of input voltage and temperature.
The S-1200 Series uses a low on-resistance P-channel MOS FET as the output transistor.
Be sure that V
to inverse current flowing from the VOUT pin through a parasitic diode to the VIN pin.
_00
HIGH RIPPLE-REJECTION LOW DROPOUT LOW INPUT-AND-OUTPUT CAPACITANCE CMOS VOLTAGE REGULATOR
OUT
does not exceed V
*1.
VSS
VIN
Current
supply
Reference voltage
V
ref
Parasitic diode
s
circuit
and R
IN
Seiko Instruments Inc.
+ 0.3 V to prevent the voltage regulator from being damaged due
f
. It supplies the output transistor with the gate voltage necessary
−
+
amplifier
Error
Figure 13
ref
) with V
R
R
s
f
fb
V
, which is the output voltage resistance-
*1
fb
VOUT
S-1200 Series
13