s-1702ecc01-i6t1g Seiko Instruments Inc., s-1702ecc01-i6t1g Datasheet - Page 24

• Manufacturer Part Number: s-1702ecc01-i6t1g
• Description: Ultra-low Current Consumption 150 Ma Voltage Regulator With Built-in High-accuracy Voltage Detector And Reset Input Function
• Manufacturer: Seiko Instruments Inc.

24
ULTRA-LOW CURRENT CONSUMPTION 150 mA VOLTAGE REGULATOR WITH BUILT-IN HIGH-ACCURACY VOLTAGE DETECTOR AND RESET INPUT FUNCTION
S-1702 Series
2. Regulator block
2. 1 Basic operation
2. 2 Output circuit
The error amplifier compares the reference voltage (V
by feedback resistors R
certain output voltage free of any fluctuations of input voltage and temperature.
The regulator output voltage (V
The block diagram of the regulator block is shown below.
The output circuit of the regulator block consists of an output transistor and a discharge shunt circuit.
The discharge shunt function is enabled or disabled for the VOUT pin. Refer to “Table 1 Product Types” for
details. The equivalent circuits are shown below.
*1. Parasitic diode
Discharge shunt function: enabled
*1. Parasitic diode
V
VSS
VIN
fb
Constant
current
source
V
V
voltage circuit
SS
IN
V
V
Reference
R
R
SS
IN
s
*1
f
V
OUT
V
ref
s
V
and R
SS
Error amplifier
V
Figure 25 Block Diagram (Regulator Block)
Figure 26 Equivalent Circuits of VOUT Pin
SS
OUT
−
+
f
. It supplies the output transistor with the gate voltage necessary to ensure a
) of the S-1702 Series can be selected from a value between 1.5 V and 5.5 V.
VOUT
Seiko Instruments Inc.
ref
) with V
V
fb
Output transistor
Output circuit
fb
R
V
R
, which is the output voltage resistance divided
OUT
s
f
Discharge shunt function: disabled
*1
V
fb
Discharge
circuit
V
shunt
V
SS
IN
R
R
s
f
*1
V
V
SS
OUT
V
SS
V
SS
VOUT
VOUT
Rev.1.1
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