S-1701 Series
www.sii-ic.com
© Seiko Instruments Inc., 2004-2010
HIGH RIPPLE-REJECTION LOW DROPOUT
CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
Rev.3.0
_00
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:
•
Low ESR capacitor can be used:
•
High ripple rejection:
•
Built-in overcurrent protector:
•
Operating voltage range:
1.5 V 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.
A ceramic capacitor of 1.0
μF
or more can be used for the output
capacitor.
70 dB typ. (at 1.0 kHz)
Overcurrent of output transistor can be restricted.
2.0 V to 6.5 V
Detector block
•
Output voltage:
1.5 V to 5.5 V, selectable in 0.1 V steps.
•
High-accuracy output voltage:
±1.0%
•
Output mode:
Nch open-drain active low output
•
No need of an external capacitor for delay
•
Three delay time settings:
No delay (60
μs),
50 ms, 100 ms
•
Operating voltage range:
0.8 V to 6.5 V
Whole regulator
•
Low current consumption
*2
•
Lead-free, Sn 100%, halogen-free
During operation: 85
μA
typ.
*1.
Attention should be paid to the power dissipation of the package when the output current is large.
*2.
Refer to “
Product Name Structure”
for details.
Applications
•
Power supply and reset circuit for battery-powered devices
•
Power supply for personal communication devices
•
Power supply for home appliances
Packages
•
SOT-23-5
•
SOT-89-5
Seiko Instruments Inc.
1
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR WITH RESET FUNCTION
Rev.3.0
_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.3.0
_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.3.0
_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.3.0
_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, “3.
Package”
regarding the package drawings and “4.
Product
name list”
for the full product names.
1. Product name
S-1701
x
xx
xx
-
xxxx
x
Environmental code
U : Lead-free (Sn 100%), halogen-free
G : Lead-free (for details, please contact our sales office)
Package name (abbreviation) and packing specifications
M5T1 : SOT-23-5, tape product
U5T1 : SOT-89-5, tape product
Detection voltage
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
*2
*1
A to Z (I and O are not provided)
*1.
Refer to the tape 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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