Rev.2.1
_00
3-CHANNEL WHITE LED DRIVER IC
(CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT
)
S-8813 Series
The S-8813 Series is a PFM control charge pump DC-DC
converter with a built-in constant-current circuit, and was
developed using CMOS technology. Its constant current output
makes this series ideal as a power supply for current drive
LEDs.
The S-8813 Series features three output channels and can
drive three LEDs.
This series is available in two types: a variable voltage type and
a variable current setting resistance type.
Moreover, since small ceramic capacitors can be used as
external capacitors (pump capacitors, input capacitors, output
capacitors), the S-8813 Series contributes to set
miniaturization.
Features
•
PFM control CMOS charge pump
•
Built-in constant-current circuit
•
Power supply voltage: 2.7 V to 4.5 V
•
Output current value: A current variable is possible between 5.0 mA and 18 mA
(At V
IOUT1,2,3
≤4.0
V, V
IN
=3.0 V)
Variable voltage type and Variable current setting resistance type are available.
•
Terminal output current matching:
±1%
max.
•
Built-in soft start circuit:
1.5 ms typ.
•
Constant current output pins:
3 channels,
±5%
accuracy
•
Oscillation frequency:
600 kHz typ.
•
ON/OFF function provided (During standby: 1 µA max.)
•
Ultra-small package:
10-Pin SON(B)
•
Lead-free products
Applications
•
Power supply for white LED display backlights
•
Constant-current circuit
•
Cellular phones and PDAs using 1-cell lithium batteries
•
Power supply for flat panel displays
Package
Package Name
10-Pin SON(B)
Package
PE010-A
Drawing Code
Tape
PE010-A
Reel
PE010-A
Product Name List
•
S-881300CPE-IPATFG (Variable current setting resistance type)
•
S-881300BPE-IOQTFG (Variable voltage type)
Seiko Instruments Inc.
1
3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)
Rev.2.1
_00
S-8813 Series
Block Diagrams
1. S-881300CPE
VIN
C
IN
=4.7
μF
SW 1
R
s
SW 2
C+
C
PUMP
=0.22
μF
SW 3
C−
PFM
control
oscillator
(600 kHz)
CPOUT
C
OUT
=10
μF
Switch
control
circuit
+
−
R
f
IOUT1
IOUT2
–
SW 4
Soft
Start
circuit
ON/OFF
circuit
ON/OFF
Reference
voltage
+
IOUT3
RISET
R
1
*1
GND
2. S-881300BPE
VIN
C
IN
=4.7
μF
SW 1
CPOUT
R
s
SW 2
C+
C
PUMP
=0.22
μF
SW 3
C−
PFM
control
oscillator
(600 kHz)
C
OUT
=10
μF
Switch
control
circuit
+
−
R
f
IOUT1
IOUT2
+
SW 4
Soft
Start
circuit
ON/OFF
circuit
ON/OFF
Reference
voltage
−
R
2
*2
IOUT3
VISET
GND
*1.
Current setting resistance
*2.
Internal resistance
Figure 1 Block Diagram
2
Seiko Instruments Inc.
3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)
Rev.2.1
_00
S-8813 Series
Pin Configuration
10-Pin SON(B)
Top View
Table 1 Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
Symbol
IOUT1
IOUT2
IOUT3
C+
C−
GND
VIN
CPOUT
Description
Output pin (constant-current output)
Output pin (constant-current output)
Output pin (constant-current output)
Pump capacitor connection pin (positive pin)
Pump capacitor connection pin (negative pin)
GND pin
Voltage input pin
Charge pump output pin (capacitor connection pin)
Variable output current pins
In the case of RISET, a resistor is connected to this
pin and changing the resistance value can vary the
output current.
In the case of VISET, changing the voltage applied
to this pin can vary the output current.
Power-off pin
High level: Normal operation (Step-up operation)
Low level: Stepping-up halt (Whole circuit stopped)
1
2
3
4
5
10
9
8
7
6
Figure 2 Pin Assignment
9
RISET / VISET
10
ON/ OFF
Seiko Instruments Inc.
3
3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)
Rev.2.1
_00
S-8813 Series
Absolute Maximum Ratings
Table 2 Absolute Maximum Ratings
(Unless otherwise specified, Ta = 25°C)
Item
IOUT 1, 2, 3 pin voltage
C+ pin voltage
C− pin voltage
VIN pin voltage
CPOUT pin voltage
RISET/VISET pin voltage
ON/ OFF
pin voltage
Symbol
V
IOUT1,2,3
V
C+
V
C−
V
IN
V
CPOUT
V
RISET
/V
VISET
V
ON/ OFF
Absolute Maximum Rating
V
SS
−0.3
to V
SS
+7
V
SS
−0.3
to V
SS
+7.5
V
SS
−0.3
to V
SS
+7
V
SS
−0.3
to V
SS
+5
V
SS
−0.3
to V
SS
+7
V
SS
−0.3
to V
SS
+7
V
SS
−0.3
to V
IN
+0.3
290 (When not mounted on board)
700
*1
Unit
V
V
V
V
V
V
V
mW
mW
°C
°C
Power dissipation
Operating ambient
temperature
Storage temperature
*1.
P
D
T
opr
T
stg
−40
to
+85
−40
to
+125
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.
(1) When mounted on board
800
Power Dissipation P
D
(mW)
700
600
500
400
300
200
100
0
0
50
100
150
(2) When not mounted on board
400
Power Dissipation P
D
(mW)
300
200
100
0
0
50
100
150
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
Figure 3 Power Dissipation of Package
4
Seiko Instruments Inc.
3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)
Rev.2.1
_00
S-8813 Series
Electrical Characteristics
1. S-881300CPE
Table 3 Electrical Characteristics
(Unless otherwise specified, V
IN
= 3.0 V, current setting resistance = 5.6 kΩ, Ta = 25°C)
Test
Symbol
Conditions
Min.
Typ.
Max.
Unit
Circuit
V
IN
I
OUT
⎯
V
IN
= 3.0 V to 4.5 V
V
IOUT1,2,3
*1
≤
3.6 V
V
IN
= 3.0 V to 4.5 V
V
I OUT1,2,3
*1
≤
4.0 V
V
IN
= 2.7 V to 3.0 V
V
I OUT1,2,3
*1
≤
3.6 V
V
IN
= 3.0 V,
V
IOUT
= 3.0 V to 4.0 V
V
IN
= 3.0 V to 4.5 V
V
IOUT
≤
3.6 V
I
OUT1,2,3
= 17.8 mA
VI
OUT
= 3.6 V
V
IN
= 2.7 V to 4.5 V
I
OUT1,2,3
= 18 mA
V
CPOUT
= 4.75 V
Measure waveform at C− pin
V
IN
= 3.0 V, I
OUT1,2,3
= 18 mA
V
IN
= 2.7 V to 4.5 V
V
CPOUT
= 4.75 V
V
IN
= 2.7 V to 4.5 V
V
IN
= 2.7 V to 4.5 V
V
IN
= 2.7 V to 4.5 V
V
IN
= 2.7 V to 4.5 V
V
IN
= 2.7 V to 4.5 V
V
IN
= 2.7 V to 4.5 V
V
IN
= 2.7 V to 4.5 V
2.7
23
18
14
⎯
⎯
−5.0
−1.0
⎯
540
⎯
⎯
⎯
2.0
⎯
−0.1
−0.1
0.3
0.98
⎯
⎯
⎯
⎯
0.5
0.5
⎯
⎯
⎯
600
82
1
0.3
⎯
⎯
⎯
⎯
1.5
1
4.5
⎯
⎯
⎯
1
1
+5.0
+1.0
100
660
⎯
1.5
1
⎯
0.3
0.1
0.1
3
1.02
ms
V
2
μA
mV
p-p
kHz
%
mA
μA
V
1
2
1
%
V
mA
2
Item
Operation input
voltage
Stabilized output
current
Output current VI
OUT
characteristics
Output current input
stability
Output current
accuracy
Inter-pin output current
variation
Ripple voltage
Maximum oscillation
frequency
Efficiency
*2
Operation
consumption current
Standby consumption
current
Power-off pin input
voltage (high level)
Power-off pin input
voltage (low level)
Power-off pin input
current (high level)
Power-off pin input
current (low level)
Soft start time
RISET pin voltage
ΔI
OUT1
ΔI
OUT2
ΔI
OUT1
I
OUT
ΔI
M
V
RIP
f
osc
η
I
SS1
I
SSS
V
SH
V
SL
I
SH
I
SL
t
SS
V
RISET
*1.
V
IOUT1, 2, 3
are the voltages of the IOUT pin.
*2.
“Efficiency” in the electrical characteristics means the efficiency of the charge pump circuit block. The ideal
efficiency is indicated by the following expression.
Efficiency =[ V
CPOUT
×
(I
OUT1
+I
OUT2
+I
OUT3
) ] / [ 2.0
×
V
IN
×
(I
OUT1
+I
OUT2
+I
OUT3
) ]
The ideal efficiency including the constant current circuit is expressed as following expression.
Efficiency =[ (V
IOUT1
×I
OUT1
)
+
(V
IOUT2
×I
OUT2
)
+
(V
IOUT3
×I
OUT3
) ] / [ 2.0
×V
IN
×
(I
OUT1
+I
OUT2
+I
OUT3
) ]
Remark
The numbers in the "test circuit" column correspond to the circuit numbers in the
“Measurement
Circuits”
section.
Seiko Instruments Inc.
5
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