S-1170 SII [Seiko Instruments Inc], S-1170 Datasheet - Page 13

• Manufacturer Part Number: S-1170
• Description: HIGH RIPPLE-REJECTION AND LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
• Manufacturer: SII [Seiko Instruments Inc]

Rev.3.0
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Operation
2. Output transistor
1. Basic operation
Figure 12 shows the block diagram of the S-1170 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-1170 Series uses a low on-resistance P-channel MOS FET as the output transistor.
Be sure that V
to inverse current flowing from VOUT pin through a parasitic diode to VIN pin.
_02
OUT
does not exceed V
*1.
VSS
VIN
Current
supply
Reference voltage
Parasitic diode
V
ref
s
circuit
and R
IN
Seiko Instruments Inc.
f
+ 0.3 V to prevent the voltage regulator from being damaged due
. It supplies the output transistor with the gate voltage necessary
−
+
amplifier
Error
Figure 12
ref
) with V
R
R
s
f
fb
V
, which is the output voltage resistance-
*1
fb
VOUT
S-1170 Series
13