Contents
Features............................................................ 1
Block Diagram .................................................. 1
Applications ...................................................... 1
Selection Guide................................................. 2
Pin Assignment ................................................. 2
Absolute Maximum Ratings............................... 3
Electrical Characteristics ................................... 3
Measurement Circuits ....................................... 4
Operation .......................................................... 4
Selection of Associated External Components .. 6
Standard Circuits............................................... 7
Precautions ....................................................... 7
Application Circuits ........................................... 8
Outlines and Dimensions................................. 11
Markings ......................................................... 11
Taping............................................................. 11
Characteristics of Major Items ......................... 13
Tansient Response Characteristics.................. 15
Frequently Asked Questions............................ 17
Rev.3.0
External Transistor Type Voltage Regulators
S-816 Series
The S-816 Series consists of external transistor type positive voltage regulators,
which have been developed using the CMOS process. These voltage regulators
incorporate an overcurrent protection, and power-off function. A low drop-out type
regulator with an output current ranging from several hundreds of mA to 1A can be
configured with the PNP transistor driven by this IC.
Despite the features of the S-816, which is low current consumption, the
improvement in its transient response characteristics of the IC with a newly deviced
phase compensation circuit made it possible to employ the products of the S-816
Series even in applications where heavy input variation or load variation is
experienced.
The S-816 Series regulators serve as ideal power supply units for portable devices
when coupled with the SOT-23-5 minipackage, providing numerous outstanding
features, including low current consumption. Since this series can accommodate an
input voltage of up to 16V, it is also suitable when operating via an AC adapter.
n
Features
Ÿ
Low current consumption
In operation : 30
m
A typ.
40
m
A max.
When powered-off : 1
m
A max.
Ÿ
Input voltage range : 16V max.
Ÿ
Output voltage accuracy :
±
2.0%
n
Applications
Ÿ
On-board power supplies of battery devices for portable
telephones, electronic notebooks, PDAs, and the like.
Ÿ
Fixed
Ÿ
Ÿ
voltage
power
supplies
for
cameras,
video
equipment and portable communications equipment.
Power Supplies for CPUs.
Post-Regulators for Switching Regulators.
Ÿ
Output voltage range : Selectable between 2.5V and 6.0V
in steps of 0.1V.
Ÿ
With power-off function.
Ÿ
A built-in current source (10 uA) eliminates the need of a
base-emitter resistance.
Ÿ
With overcurrent (base current) protection function.
Ÿ
Main Regulators in Multiple-Power Supply Systems.
n
Block Diagram
V
IN
EXT
V
OUT
Current Source
Pull-Up
+
Overcurrent
Protection
Circuit
+
-
Error
-
Vref
Amplifier
Sink
Driver
ON/OFF
V
SS
Note: To ensure you power cutoff of the external transistor when the device is powered down, the EXT output is pulled up to VIN
by a pull-up resistance (approx. 0.5MW) inside the IC.
The diode inside the IC is a parasitic diode.
Figure 1. Block Diagram
Seiko Instruments Inc.
1
External Transistor Type Voltage Regulators
S-816 Series
Rev.3.0
n
Selection Guide
1. Product Name
S - 816A XX A MC - XXX - T2
Tape Specifications
Product Name Abbreviation
Package Name Abbreviation
Output Voltage x 10
2. Product List (As of May 28, 1998)
Output Voltage (V)
2.5V±2.0%
2.6V±2.0%
2.7V±2.0%
2.8V±2.0%
2.9V±2.0%
3.0V±2.0%
3.1V±2.0%
3.2V±2.0%
3.3V±2.0%
3.4V±2.0%
3.5V±2.0%
3.6V±2.0%
3.7V±2.0%
3.8V±2.0%
3.9V±2.0%
4.0V±2.0%
4.1V±2.0%
4.2V±2.0%
SOT-23-5
S-816A25AMC-BAA-T2
-
-
-
-
S-816A30AMC-BAF-T2
-
-
S-816A33AMC-BAI-T2
-
-
-
S-816A37AMC-BAM-T2
-
-
S-816A40AMC-BAP-T2
-
-
Output Voltage (V)
4.3V±2.0%
4.4V±2.0%
4.5V±2.0%
4.6V±2.0%
4.7V±2.0%
4.8V±2.0%
4.9V±2.0%
5.0V±2.0%
5.1V±2.0%
5.2V±2.0%
5.3V±2.0%
5.4V±2.0%
5.5V±2.0%
5.6V±2.0%
5.7V±2.0%
5.8V±2.0%
5.9V±2.0%
6.0V±2.0%
SOT-23-5
-
-
-
-
-
-
-
S-816A50AMC-BAZ-T2
-
-
-
-
-
-
-
-
-
-
Please contact the SII Sales Department regarding the availability of samples.
n
Pin Assignment
SOT-23-5
Top view
5
4
1
2
3
Terminal
No.
1
2
3
4
5
Terminal
Name
EXT
V
SS
ON/OFF
V
IN
V
OUT
Function
Output Terminal for Base-Current Control
GND Terminal
Power-Off Terminal ("H" active)
IC Power Supply Terminal
Output Voltage Monitoring Terminal
Figure 2
2
Seiko Instruments Inc.
Rev.3.0
External Transistor Type Voltage Regulators
S-816 Series
n
Absolute Maximum Ratings
Note: Although this IC incorporates an electrostatic protection circuit, the user is urged to avoid subjecting
it to an extremely high static electricity or static voltage in excess of the performance of the said protection circuit.
(Ta = 25°C, unless otherwise specified)
Item
V
IN
Terminal Voltage
V
OUT
Terminal Voltage
ON/OFF Terminal Voltage
EXT Terminal Voltage
EXT Terminal Current
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Symbol
VIN
VOUT
ON/OFF
VEXT
IEXT
PD
TOPR
TSTG
Ratings
V
SS
-0.3 to V
SS
+18
V
SS
-0.3 to V
SS
+18
V
SS
-0.3 to V
SS
+18
V
SS
-0.3 to V
IN
+0.3
50
150
-40 to +85
-40 to +125
Unit
V
V
V
V
mA
mW
°C
°C
n
Electrical Characteristics
(Ta = 25°C, unless otherwise specified)
Item
Input Voltage
Output Voltage
Maximum Output Current (PNP
Output) *1
Drop-Out Voltage
*1
Load Regulation (PNP Output)
*1
Line Regulation (PNP Output)
*1
Output Voltage Temperature
Coefficient
Current Consumption during
Operation
Current Consumption during
Power-Off
EXT Output Source Constant
Current
EXT Output Pull-Up Resistance
Symbol
VIN
VOUT
Conditions
Min.
-
VOUT
X 0.98
-
-
-
-0.15
-
-
-
-
0.25
-
-
12
2.4
-
-
-
Typ.
-
VOUT
1
100
-
0.01
±0.15
30
-
-10
0.50
10
-
16
-
-
-
-
Max.
16
VOUT
X 1.02
-
-
60
0.15
-
40
1
-
1.00
-
0.1
20
-
0.3
0.1
-0.1
Unit
V
V
A
mV
mV
%/V
mV/°C
mA
mA
mA
MW
mA
mA
mA
V
V
mA
mA
Meas.
Circuit
V
IN
= VOUT + 1V,Iout = 50mA
ON/OFF = "H"
1
1
1
1
1
1
1
1
1
2
2
2
2
2
3
3
2
2
Iout = 100mA
DVdrop
V
IN
= VOUT + 1V,1mA < Iout < 1A
DVOUT
Iout = 50mA,VOUT + 1V < V
IN
<16V
D
VOUT
VOUT x
D
VIN
DVOUT
DTa
ISS
ISTB
Isrc
Rup
Isink
Ioff
Imax
VSH
VSL
ISH
ISL
V
IN
= VOUT + 1V,Iout = 50mA
ON/OFF = "H",Ta = -40 to 85
°C
V
IN
= VOUT + 1V,ON/OFF = ”H”
V
IN
= 16V,ON/OFF = ”L”
V
IN
= VOUT + 1V,ON/OFF = "H"
EXT = VOUT,V
OUT
= VOUT x 0.95
V
IN
= 16V,ON/OFF = "L"
V
IN
= VOUT + 1V,ON/OFF = "H"
V
OUT
= VOUT x 0.95
V
IN
= EXT = VOUT + 1V,V
OUT
= 0V
ON/OFF = "L"
V
IN
= EXT = 7V,ON/OFF = "H"
V
OUT
= VOUT x 0.95
Check V
IN
= VOUT + 1V,V
OUT
= 0V,EXT =
"
L
"
Check V
IN
= VOUT + 1V,V
OUT
= 0V,EXT =
"
H
"
EXT Output Sink Current
Leakage Current during EXT
Output Off
EXT Output Sink Overcurrent
Set Value
Power-Off Terminal Input Voltage
Power-Off Terminal Input Current
ON/OFF = VOUT + 1V
ON/OFF = 0V
*1
The characteristics vary with the associated external components.
The characteristics given above are those obtained when the IC is combined with a Toshiba 2SA1213-Y for the PNP
transistor and a 10 uF tantalum capacitor for the output capacitor (CL).
Seiko Instruments Inc.
3
External Transistor Type Voltage Regulators
S-816 Series
Rev.3.0
n
Measurement Circuits
1
2
A
A
V
IN
EXT
V
OUT
+
-
A
A
V
IN
EXT
V
OUT
A
+
-
ON/OFF
V
V
SS
A
ON/OFF
V
SS
3
A
V
IN
EXT
V
OUT
A
A
ON/OFF
V
V
SS
Figure 3
n
Operation
1. Basic Operation
Figure 4 shows a block diagram of the S-816 Series.
The device compares the voltage which is obtained from dividing output voltage VOUT by feedback resistances RA and RB
with reference voltage Vref through the error amplifier, output of which controls the sink driver. By regulating the base current
of the external PNP transistor, the IC maintains a constant output voltage that is not susceptible to an input voltage variation
temperature variation.
or
IN
OUT
V
IN
EXT
V
OUT
current source
RC
Overcurrent
protection
circuit
RA
+
CL
-
Vref
Error
amplifier
ON/OFF
Sink
driver
RB
V
SS
Figure 4
4
Seiko Instruments Inc.
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