S-1137 Series
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© Seiko Instruments Inc., 2009-2010
HIGH RIPPLE-REJECTION LOW DROPOUT
SOFT-START FUNCTION CMOS VOLTAGE REGULATOR
Rev.2.0
_01
S-1137 Series, developed using the CMOS technology, is a positive voltage regulator IC which has the low dropout voltage,
the high-accuracy output voltage and the soft-start function (300 mA output current).
A 1.0
μF
small ceramic capacitor can be used. It operates with low current consumption of 45
μA
typ.
The overcurrent protection circuit prevents the load current from exceeding the capacitance of output transistor. The
power-off circuit ensures longer battery life.
Compared to the conventional CMOS technology regulator ICs, various capacitors including small ceramic capacitors can be
used for this IC.
Furthermore a small SOT-89-5, SOT-23-5, and SNT-6A(H) packages realize high-density mounting.
Features
•
Output voltage:
•
Low equivalent series resistance capacitor :
•
Wide input voltage range:
•
High-accuracy output voltage:
•
Low dropout voltage:
•
Low current consumption:
•
Output current:
•
Soft-start circuit with external capacitor:
•
High ripple rejection:
•
Built-in overcurrent protection circuit:
•
Built-in power-off circuit:
•
Discharge shunt circuit can be selected.
•
Pull-down resistor is selectable
•
Lead-free, Sn 100%, halogen-free
*2
1.2 V to 3.5 V, selectable in 0.05 V step.
Ceramic capacitor of 1.0
μF
or more can be used as the I/O capacitor.
1.7 V to 5.5 V
±1.0%
(1.2 V to 1.45 V output product :
±15
mV)
210 mV typ. (products having the output of 2.8 V, I
OUT
= 300 mA)
During operation:
45
μA
typ., 65
μA
max.
During power-off:
0.1
μA
typ., 1.0
μA
max.
Possible to output 300 mA (at V
IN
≥
V
OUT(S)
+
1.0 V)
*1
Soft-start time : 0.7 ms (C
SS
= 1.0 nF)
70 dB typ. (at 1.0 kHz)
limits overcurrent of output transistor
Ensures long battery life.
*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 for battery-powered devices
•
Power supply for cellular phones, portable devices
•
Power supply for digital still cameras, TVs, DVD recorders
Packages
•
SOT-89-5
•
SOT-23-5
•
SNT-6A(H)
Seiko Instruments Inc.
1
HIGH RIPPLE-REJECTION LOW DROPOUT SOFT-START FUNCTION CMOS VOLTAGE REGULATOR
Rev.2.0
_01
S-1137 Series
Product Name Structure
Users can select the product type, output voltage, and package type for the S-1137 Series. Refer to “1.
Product
name”
regarding the contents of product name, “2.
Function list of product type”
regarding the product type, “3.
Package”
regarding the package drawings.
1.
Product name
(1)
SOT-89-5, SNT-6A(H)
S-1137
x
xx
−
xxxx
x
Environmental code
U:
Lead-free (Sn 100%), halogen-free
G:
Lead-free (for details, please contact our sales office)
Package abbreviation and IC packing specifications
U5T1: SOT-89-5, Tape
I6T2: SNT-6A(H), Tape
*1
Output voltage
*2
12 to 35
(e.g., when the output voltage is 1.2 V, it is expressed as 12.)
Product type
*3
A to D
*1.
*2.
*3.
(2)
Refer to the tape specifications.
If you request the product which has 0.05 V step, contact our sales office.
Refer to “2.
Function list of product type”.
SOT-23-5
S-1137
x
xx
−
M5T1
x
Environmental code
U:
Lead-free (Sn 100%), halogen-free
S:
Lead-free, halogen-free
Package abbreviation and IC packing specifications
M5T1: SOT-23-5, Tape
*1
Output voltage
*2
12 to 35
(e.g., when the output voltage is 1.2 V, it is expressed as 12.)
Product type
*3
A to D
*1.
*2.
*3.
Refer to the tape specifications.
If you request the product which has 0.05 V step, contact our sales office.
Refer to “2.
Function list of product type”.
4
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