Manual

5
Jan. 2013 Rev. 1. 8 BCD Semiconductor Manufacturing Limited
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Data Sheet
Parameter Symbol Conditions Min Typ Max Unit
Input Section
Input Voltage V
IN
I
D
=0 to 40 mA 2.7 5.5 V
Supply Current I
CC
No Load, ISET floating 1.5 2.5 mA
Shutdown Supply Current I
SHDN
V
EN
=GND 0.1 1 μA
Charge Pump Section
Switching Frequency f
OSC
0.65 1 1.35 MHz
Efficiency
η
V
IN
=3.5V, I
D
=40mA Total 93 %
Current Source Section
Maximum Output Current per
Source
I
DX
3.2V≤V
IN
≤5.5V,
T
A
=-40
o
C to 85
o
C
18 20 22 mA
Current Matching between Any
Two Outputs
I
D-MATCH
-3 3 %
Output Current Line Regulation
(ΔI
D
/I
D
)/
ΔV
3.5V≤V
IN
≤5.5V
-2 2 %/V
Current Matching between Any
Two Outputs under Different LED
Forward Voltage
ΔI
D
/I
D
3.0V≤V
D
≤4.0V, V
IN
=3.5V
-5 5 %
Reference Voltage for Current Set
V
ISET
1.193 1.23 1.267 V
I
D
to I
SET
Current Ratio
K 100 120 140
Enable Section
EN High Level Threshold Voltage V
IH
1.4 V
EN Low Level Threshold Voltage V
IL
0.5 V
EN Input Leakage Current I
EN
V
EN
=5.5V -1 1 μA
EN Low Threshold Time for
Standby State
t
STB
2ms
Total Device
Soft-Start Time t
SS
I
D
=80mA Total 400 μs
Thermal Shutdown T
OTSD
160
o
C
Thermal Shutdown Hysteresis T
HYS
20
o
C
Electrical Characteristics
(V
IN
=3.5V, V
EN
=V
IN
, R
ISET
=1.8kΩ, C
FLY1
=C
FLY2
=C
IN
=C
OUT
=1μF, T
A
=25
o
C, V
D1
=V
D2
=V
D3
=V
D4
=3.4V, unless
otherwise specified. )