s-1206b23-u3t1g Seiko Instruments Inc., s-1206b23-u3t1g Datasheet - Page 12

• Manufacturer Part Number: s-1206b23-u3t1g
• Description: Ultra Low Current Consumption And Low Dropout Cmos Voltage Regulator
• Manufacturer: Seiko Instruments Inc.

12
ULTRA LOW CURRENT CONSUMPTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1206 Series
Operation
1. Basic Operation
2. Output Transistor
Figure 11 shows the block diagram of the S-1206 Series.
The error amplifier compares the reference voltage (V
feedback resistors R
output voltage free of any fluctuations of input voltage and temperature.
The S-1206 Series uses a low-on-resistance P-channel MOS FET as the output transistor.
Be sure that V
from the VOUT pin through a parasitic diode to the VIN pin.
OUT
current supply
*1. Parasitic diode
does not exceed V
VIN
VSS
Constant
s
and R
Reference voltage
V
f
. It supplies the output transistor with the gate voltage necessary to ensure a certain
ref
circuit
IN
+ 0.3 V to prevent the IC from being damaged due to inverse current flowing
Error amplifier
Seiko Instruments Inc.
−
+
Figure 11
ref
) with V
fb
, which is the output voltage resistance-divided by
V
R
R
fb
f
s
*1
VOUT
Rev.1.1
_00