Rev.2.1
_00
HIGH RIPPLE-REJECTION WLP PACKAGE
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2985 Series
The S-L2985 Series is a positive voltage regulator
with a low dropout voltage, high output voltage
accuracy, and low current consumption developed
based on CMOS technology.
A built-in low on-resistance transistor provides a
low dropout voltage and large output current, and a
built-in overcurrent protector prevents the load
current from exceeding the current capacitance of
the output transistor. An ON/OFF circuit ensures a
long battery life. Compared with the voltage
regulators using the conventional CMOS process,
a larger variety of capacitors are available,
including small ceramic capacitors.
A super-small
WLP-4B package realizes high-density mounting.
Features
1.5 V to 5.5 V, selectable in 0.1 V steps.
±1.0%
190 mV typ. (3.0 V output product, I
OUT
=
100 mA)
During operation: 50
μA
typ., 90
μA
max.
During shutdown: 0.1
μA
typ., 1.0
μA
max.
•
High peak current capability:
150 mA output is possible (@ V
IN
≥
V
OUT(S)
+
1.0 V)
*1
Ensures long battery life.
•
Built-in ON/OFF circuit:
•
Low ESR capacitor can be used: A ceramic capacitor of 0.47
μF
or more can be used for the output
capacitor.
80 dB typ. (@ 1.0 kHz)
•
High ripple rejection:
Overcurrent of output transistor can be restricted.
•
Built-in overcurrent protector:
WLP-4B
•
Super-small package:
•
Lead-free products
*1.
Attention should be paid to the power dissipation of the package when the output current is large.
•
Output voltage:
•
High-accuracy output voltage:
•
Low dropout voltage:
•
Low current consumption:
Applications
•
Power supply for battery-powered devices
•
Power supply for personal communication devices
•
Power supply for home electric/electronic appliances
•
Power supply for cellular phones
Package
Package name
WLP-4B
Package
HB004-A
Drawing code
Tape
HB004-A
Reel
HB004-A
Seiko Instruments Inc.
1
HIGH RIPPLE-REJECTION WLP PACKAGE LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.1
_00
S-L2985 Series
Product Code Structure
•
The product types, output voltage and package name for the S-L2985 Series can be selected at the
user’s request. Refer to the “Product name” for the meanings of the characters in the product name and
“Product name list” for the full product names.
1. Product name
S-L2985
x
xx
−
H4T1
Package name (abbreviation) and packing specifications
*1
H4T1: WLP-4B, Tape
Output voltage
15 to 55
(E.g., when the output voltage is 1.5 V, it is expressed as 15)
Product type
*2
A: ON/OFF pin negative logic
B: ON/OFF pin positive logic
*1.
Refer to the taping specifications at the end of this book.
*2.
Refer to 3. Shutdown (ON/OFF pin) under the Operation.
2. Product name list
Table 1
Output voltage
WLP-4B
1.5V±1.0%
S-L2985B15-H4T1
1.8V±1.0%
S-L2985B18-H4T1
2.5V±1.0%
S-L2985B25-H4T1
2.6V±1.0%
S-L2985B26-H4T1
2.7V±1.0%
S-L2985B27-H4T1
2.8V±1.0%
S-L2985B28-H4T1
2.9V±1.0%
S-L2985B29-H4T1
3.0V±1.0%
S-L2985B30-H4T1
3.1V±1.0%
S-L2985B31-H4T1
3.2V±1.0%
S-L2985B32-H4T1
3.3V±1.0%
S-L2985B33-H4T1
3.4V±1.0%
S-L2985B34-H4T1
3.5V±1.0%
S-L2985B35-H4T1
5.0V±1.0%
S-L2985B50-H4T1
Remark
Please contact the SII marketing department for products with an output voltage other than
those specified above or type A products.
Seiko Instruments Inc.
3
HIGH RIPPLE-REJECTION WLP PACKAGE LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.1
_00
S-L2985 Series
Absolute Maximum Ratings
Table 3
Item
Input voltage
Symbol
V
IN
V
ON/OFF
V
OUT
P
D
T
opr
T
stg
(Ta
=
25°C unless otherwise specified)
Absolute Maximum Rating
Unit
V
V
SS
−
0.3 to V
SS
+
7
V
SS
−
0.3 to V
IN
+
0.3
V
SS
−
0.3 to V
IN
+
0.3
350
*1
mW
−40
to
+85
°C
−40
to
+125
Output voltage
Power dissipation
Operating ambient temperature
Storage ambient temperature
*1.
When mounted on board
[Mounted board]
(1) Board size : 114.3 mm
×
76.2 mm
×
t1.6 mm
(2) Board name : JEDEC STANDARD51-7
Caution The absolute maximum ratings are rated values exceeding which the product could suffer
physical damage. These values must therefore not be exceeded under any conditions.
600
500
400
300
200
100
0
0
50
100
150
Ta (°C)
Power Dissipation
P
D
(mW)
Ambient Temperature
Figure 3 Power Dissipation of Package (When Mounted on Board)
Seiko Instruments Inc.
5
PCB Design
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