S-8813 Datasheet, PDF (5/29 Pages) Seiko Instruments Inc – 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)

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)
Item
Symbol
Conditions
Min. Typ. Max.
Unit
Test
Circuit
Operation input
voltage
V_IN
⎯
2.7
⎯
4.5
V
2
Stabilized output
current
Output current VI_OUT
characteristics
Output current input
stability
Output current
accuracy
I_OUT
ΔI_OUT1
ΔI_OUT2
ΔI OUT1
IOUT
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
*1
OUT1,2,3
≤
4.0
V
V_IN = 2.7 V to 3.0 V
V_I
*1
OUT1,2,3
≤
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
23
⎯
⎯
mA
18
⎯
⎯
14
⎯
⎯
⎯
0.5
1
⎯
0.5
1
−5.0 ⎯ +5.0
%
Inter-pin output current
variation
ΔI_M
VI_OUT = 3.6 V
−1.0 ⎯ +1.0
Ripple voltage
V_RIP
V_IN = 2.7 V to 4.5 V
I_OUT1,2,3 = 18 mA
⎯
⎯
100 mV_p-p
Maximum oscillation
frequency
f_osc
V_CPOUT = 4.75 V
Measure waveform at C− pin
540 600 660
kHz
1
Efficiency^*2
η
V_IN = 3.0 V, I_OUT1,2,3 = 18 mA
⎯
82
⎯
%
2
Operation
consumption current
I_SS1
V_IN = 2.7 V to 4.5 V
V_CPOUT = 4.75 V
⎯
1
1.5
mA
1
Standby consumption
current
I_SSS V_IN = 2.7 V to 4.5 V
⎯
0.3
1
μA
Power-off pin input
voltage (high level)
V_SH V_IN = 2.7 V to 4.5 V
2.0
⎯
⎯
V
Power-off pin input
voltage (low level)
V_SL V_IN = 2.7 V to 4.5 V
⎯
⎯
0.3
Power-off pin input
current (high level)
I_SH V_IN = 2.7 V to 4.5 V
−0.1 ⎯
0.1
μA
Power-off pin input
current (low level)
I_SL
V_IN = 2.7 V to 4.5 V
−0.1 ⎯
0.1
Soft start time
RISET pin voltage
t_SS
V_RISET
V_IN = 2.7 V to 4.5 V
V_IN = 2.7 V to 4.5 V
0.3 1.5
3
ms
2
0.98 1 1.02
V
*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.
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