Rev.2.4
_00
HIGH RIPPLE-REJECTION LOW DROPOUT
CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
S-1701 Series
The S-1701 Series, developed based on CMOS technology, is a
voltage regulator with a reset function and integrates a high-
accuracy voltage detector with on-chip delay circuit and a positive
voltage regulator with a low dropout voltage and high output voltage
on one chip.
The S-1701 Series is available in many types according to the
selection of the voltage detector block of the voltage detector,
including a SENSE pin input product. A built-in low on-resistance
transistor provides a low dropout voltage and large output current.
Small ceramic capacitors are available and an external capacitor for
delay is needless. Small SOT-23-5 and SOT-89-5 packages realize
high-density mounting.
Features
Regulator block
•
Output voltage:
•
High-accuracy output voltage:
•
High peak current capability:
•
Built-in ON/OFF circuit:
1.5 to 5.0 V, selectable in 0.1 V steps.
±1.0%
400 mA output is possible (at V
IN
≥
V
OUT(S)
+
2.0 V)
*1
Ensures long battery life.
During power-off: 0.1
µA
typ., 1.0
µA
max.
•
Low ESR capacitor can be used: A ceramic capacitor of 1.0
µF
or more can be used for the output
capacitor.
70 dB typ. (at 1.0 kHz)
•
High ripple rejection:
Overcurrent of output transistor can be restricted.
•
Built-in overcurrent protector:
2.0 to 6.5 V
•
Operating voltage range:
Detector block
1.5 to 5.5 V, selectable in 0.1 V steps.
•
Output voltage:
•
High-accuracy output voltage:
±1.0%
Nch open-drain active low output
•
Output mode:
•
No need of an external capacitor for delay
No delay (60
µs),
50 ms, 100 ms
•
Three delay time settings:
0.8 to 6.5 V
•
Operating voltage range:
Whole regulator
•
Low current consumption
During operation: 85
µA
typ.
SOT-23-5, SOT-89-5
•
Small package:
•
Lead-free products
*1.
Attention should be paid to the power dissipation of the package when the output current is large.
Applications
•
Power supply and reset circuit for battery-powered devices
•
Power supply for personal communication devices
•
Power supply for home appliances
Packages
Package Name
SOT-23-5
SOT-89-5
Package
MP005-A
UP005-A
Drawing Code
Tape
MP005-A
UP005-A
Reel
MP005-A
UP005-A
1
Seiko Instruments Inc.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
Rev.2.4
_00
S-1701 Series
Block Diagrams
1. S-1701 Series A/ B/ C/ G/ H/ J types
*1
ON/OFF
Overcurrent
protector circuit
ON/OFF
circuit
Reference
voltage circuit
+
−
VOUT
ON/OFF pin :
SENSE pin :
Provided
VIN connection
VIN
+
−
VSS
VDOUT
Reference
voltage circuit
Oscillating
counter timer
(Delay circuit)
*1
*1.
Parasitic diode
Figure 1
2. S-1701 Series D/ E/ F/ K/ L/ M types
*1
ON/OFF
Overcurrent
protector circuit
ON/OFF
circuit
Reference
voltage circuit
+
−
VOUT
ON/OFF pin :
SENSE pin :
Provided
VOUT connection
VIN
+
−
VSS
VDOUT
Reference
voltage circuit
Oscillating
counter timer
(Delay circuit)
*1
*1.
Parasitic diode
Figure 2
2
Seiko Instruments Inc.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
Rev.2.4
_00
S-1701 Series
3. S-1701 Series N/ P/ Q types
*1
SENSE
Overcurrent
protector circuit
ON/OFF
circuit
Reference
voltage circuit
+
−
VOUT
ON/OFF pin :
SENSE pin :
VIN connection
Provided
VIN
+
−
VSS
VDOUT
Reference
voltage circuit
Oscillating
counter timer
(Delay circuit)
*1
*1.
Parasitic diode
Figure 3
4. S-1701 Series R/ S/ T types
*1
SENSE
Overcurrent
protector circuit
ON/OFF
circuit
Reference
voltage circuit
+
−
VOUT
ON/OFF pin :
SENSE pin :
VDOUT connection
Provided
VIN
+
−
VSS
VDOUT
Reference
voltage circuit
Oscillating
counter timer
(Delay circuit)
*1
*1.
Parasitic diode
Figure 4
Seiko Instruments Inc.
3
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
Rev.2.4
_00
S-1701 Series
5. S-1701 Series U/ V/ W types
*1
VOUT
Overcurrent
protector circuit
ON/OFF
circuit
Reference
voltage circuit
+
−
ON/OFF pin :
SENSE pin :
VIN connection
VOUT connection
VIN
+
−
VSS
VDOUT
Reference
voltage circuit
Oscillating
counter timer
(Delay circuit)
*1
*1.
Parasitic diode
Figure 5
6. S-1701 Series X/ Y/ Z types
*1
VOUT
Overcurrent
protector circuit
ON/OFF
circuit
Reference
voltage circuit
+
−
ON/OFF pin :
SENSE pin :
VIN connection
VIN connection
VIN
+
−
VSS
VDOUT
Reference
voltage circuit
Oscillating
counter timer
(Delay circuit)
*1
*1.
Parasitic diode
Figure 6
4
Seiko Instruments Inc.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
Rev.2.4
_00
S-1701 Series
Product Name Structure
•
The product types, output voltage, detection voltage, and package types for the S-1701 Series can be
selected at the user’s request. Refer to the “1.
Product name”
for the meanings of the characters in the
product name, “2.
Function list according to product type”
for product types, and “3.
Product name
list”
for the full product names.
1. Product name
S-1701
x
xx
xx
-
xxxx
G
Package abbreviation and IC packing
specifications
*1
M5T1: SOT-23-5, tape product
U5T1: SOT-89-5, tape product
Detection voltage
*2
15 to 55
(e.g., when the output voltage is 1.5 V,
it is expressed as 15.)
Output voltage
15 to 50
(e.g., when the output voltage is 1.5 V,
it is expressed as 15.)
Product type
*3
A to Z (I and O are not provided)
*1.
Refer to the taping specifications at the end of this book.
*2.
In the S-1701D to S-1701F, S-1701K to S-1701M, and S-1701U to S-1701W types (that detect
output voltage), a reset signal may be output due to the undershoot of the output voltage when the
input voltage or load current changes transiently. Therefore, set the detection voltage after
sufficient evaluation using actual devices.
*3.
Refer to the “2.
Function list according to product type”.
Seiko Instruments Inc.
5
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