MAX8647 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX8647 Datasheet PDF : 15 Pages
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Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
ELECTRICAL CHARACTERISTICS (continued)
(VVDD = VIN = 3.6V, VGND = 0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX
SDA Output Low Voltage
I2C Clock Frequency
ISDA = 3mA, for acknowledge (Note 2)
0.03 0.40
400
Bus Free Time Between START and
STOP (tBUF)
(Note 2)
1.3
Hold Time Repeated START Condition
(tHD_STA)
(Note 2)
0.6
0.1
SCL Low Period (tLOW)
SCL High Period (tHIGH)
(Note 2)
(Note 2)
1.3
0.2
0.6
0.2
Setup Time Repeated START
Condition (tSU_STA)
(Note 2)
0.6
0.1
SDA Hold Time (tHD_DAT)
SDA Setup Time (tSU_DAT)
(Note 2)
(Note 2)
0
-0.01
100
50
Setup Time for STOP Condition
(tSU_STO)
(Note 2)
0.6
0.1
SERIAL-PULSE LOGIC (EN_) (MAX8648)
Logic-Input High Voltage
Logic-Input Low Voltage
Logic-Input Current
VIN = 2.7V to 5.5V
VIN = 2.7V to 5.5V
VIL = 0V or VIH = 5.5V
TA = +25°C
TA = +85°C
1.4
0.4
-1
0.01
+1
0.1
EN Low Shutdown Delay tSHDN
See Figure 3 and the Shutdown Mode section; EN_
needs to be longer than 4ms to ensure LED is
4
powered off
tLO (Figure 3)
tHI (Figure 3)
Initial tHI (Figure 3)
CHARGE PUMP
First EN_ high pulse
1
500
1
120
Switching Frequency
1
Soft-Start Time
0.5
Charge-Pump Regulation Voltage
Open-Loop NEG Output Resistance
NEG Discharge Resistance in
Shutdown or When the Charge Pump
is Inactive
(VIN - VNEG)
(VNEG - 0.5 x VIN) / INEG
All LEDs off, EN_ = GND
4.3
5.0
2.5
5
10
LED1–LED6 CURRENT REGULATOR
Current Setting Range
Through an I2C or serial-pulse interface
0.1
24.0
Current Accuracy
24mA setting, TA = +25°C
-2
±1
+2
VLED_ = 0.5V for
charge-pump inactive,
VLED_ = -0.9V,
VNEG_ = -1.4V
24mA setting, TA = -40°C
to derating function start
temperature (Note 2)
-5
+5
1.6mA setting, TA = +25°C -15
±5
+15
UNITS
V
kHz
µs
µs
µs
µs
µs
µs
ns
µs
V
V
µA
ms
µs
µs
µs
MHz
ms
V
Ω
kΩ
mA
%
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