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Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
ELECTRICAL CHARACTERISTICS (continued)
(V VDD = V IN = 3.6V, V GND = 0V, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)
PARAMETER
SDA Output Low Voltage
CONDITIONS
I SDA = 3mA, for acknowledge (Note 2)
MIN
TYP
0.03
MAX
0.40
UNITS
V
I 2 C Clock Frequency
400
kHz
Bus Free Time Between START and
STOP (t BUF )
(Note 2)
1.3
μs
Hold Time Repeated START Condition
(t HD_STA )
SCL Low Period (t LOW )
SCL High Period (t HIGH )
Setup Time Repeated START
Condition (t SU_STA )
SDA Hold Time (t HD_DAT )
SDA Setup Time (t SU_DAT )
Setup Time for STOP Condition
(t SU_STO )
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
(Note 2)
0.6
1.3
0.6
0.6
0
100
0.6
0.1
0.2
0.2
0.1
-0.01
50
0.1
μs
μs
μs
μs
μs
ns
μs
SERIAL-PULSE LOGIC (EN_) (MAX8648)
Logic-Input High Voltage
Logic-Input Low Voltage
V IN = 2.7V to 5.5V
V IN = 2.7V to 5.5V
1.4
0.4
V
V
Logic-Input Current
V IL = 0V or V IH = 5.5V
T A = +25°C
T A = +85°C
-1
0.01
0.1
+1
μA
See Figure 3 and the Shutdown Mode section; EN_
EN Low Shutdown Delay t SHDN
needs to be longer than 4ms to ensure LED is
4
ms
powered off
t LO (Figure 3)
t HI (Figure 3)
1
1
500
μs
μs
Initial t HI (Figure 3)
First EN_ high pulse
120
μs
CHARGE PUMP
Switching Frequency
Soft-Start Time
1
0.5
MHz
ms
Charge-Pump Regulation Voltage
(V IN - V NEG )
4.3
5.0
V
Open-Loop NEG Output Resistance
(V NEG - 0.5 x V IN ) / I NEG
2.5
5
Ω
NEG Discharge Resistance in
Shutdown or When the Charge Pump
All LEDs off, EN_ = GND
10
k Ω
is Inactive
LED1–LED6 CURRENT REGULATOR
Current Setting Range
Through an I 2 C or serial-pulse interface
0.1
24.0
mA
Current Accuracy
V LED_ = 0.5V for
charge-pump inactive,
V LED_ = -0.9V,
V NEG_ = -1.4V
24mA setting, T A = +25°C
24mA setting, T A = -40°C
to derating function start
temperature (Note 2)
1.6mA setting, T A = +25°C
-2
-5
-15
±1
±5
+2
+5
+15
%
_______________________________________________________________________________________
3
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