S-1701A2728-M5T1G SII [Seiko Instruments Inc], S-1701A2728-M5T1G Datasheet - Page 40

• Manufacturer Part Number: S-1701A2728-M5T1G
• Description: HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
• Manufacturer: SII [Seiko Instruments Inc]

Regulator block
40
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
S-1701 Series
Operation
2. Output transistor
1. Basic operation
The S-1701 Series uses a low on-resistance P-channel MOS FET as the output transistor.
Be sure that V
inverse current flowing from the VOUT pin through a parasitic diode to the VIN pin.
Figure 34 shows the block diagram of the regulator block.
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.
Output voltage is selectable from the range of 1.5 to 5.0 V in the S-1701 Series.
OUT
*1. Parasitic diode
VSS
Current
supply
VIN
does not exceed V
voltage circuit
V
Reference
ref
Figure 34 Block Diagram (Regulator Block)
s
and R
Error amplifier
IN
−
+
+ 0.3 V to prevent the voltage regulator from being damaged due to
Seiko Instruments Inc.
f
. It supplies the output transistor with the gate voltage necessary
ref
) with V
R
R
s
f
fb
, which is the output voltage resistance
V
*1
fb
VOUT
Rev.2.4
_00