S-8813 Datasheet, PDF (6/29 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)
S-8813 Series
Rev.2.1_00
2. S-881300BPE
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
VISET pin voltage
Table 4 Electrical Characteristics
(Unless otherwise specified, V_IN = 3.0 V, current setting voltage = 1.8 V, Ta = 25°C)
Symbol
Conditions
Min. Typ. Max.
Unit
Test
Circuit
V_IN
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 = 18 mA
2.7
⎯
4.5
V
2
23
⎯
⎯
mA
18
⎯
⎯
14
⎯
⎯
⎯
0.5
1
⎯
0.5
1
−5.0 ⎯ +5.0
%
ΔI_M
V_IOUT = 3.6 V
−1.0 ⎯ +1.0
V_RIP V_IN=2.7 V to 4.5 V
f_osc
V_CPOUT = 4.75 V
Measure waveform at C- pin
η
V_IN = 3.0 V
I_SS1
V_IN = 2.7 V to 4.5 V
V_CPOUT = 4.75 V
I_SSS V_IN = 2.7 V to 4.5 V
⎯
⎯
100 mV_p-p
540 600 660 kHz
1
⎯
82
⎯
%
2
⎯
1
1.5
mA
1
⎯
0.3
1
μA
V_SH V_IN = 2.7 V to 4.5 V
2.0
⎯
⎯
V
V_SL V_IN = 2.7 V to 4.5 V
⎯
⎯
0.3
I_SH V_IN = 2.7 V to 4.5 V
−0.1 ⎯
0.1
μA
I_SL
t_SS
V_VISET
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
−0.1 ⎯
0.1
0.3 1.5
3
ms
2
0.5
⎯
1.8
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.
6
Seiko Instruments Inc.