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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8648 Datasheet

(MAX8647 / MAX8648) Ultra-Efficient Charge Pumps

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19-0790; Rev 0; 4/07
EVAALVUAAILTAIOBNLEKIT
Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
General Description
The MAX8647/MAX8648 drive up to six white LEDs or
two sets of RGB LEDs with regulated constant current
for display backlight and fun light applications. By utiliz-
ing an inverting charge pump and extremely low-
dropout adaptive current regulators, these ICs achieve
very high efficiency over the full 1-cell Li+ battery volt-
age range and even with large LED forward voltage
mismatch. The 1MHz fixed-frequency switching allows
for tiny external components. The regulation scheme is
optimized to ensure low EMI and low input ripple. The
MAX8647/MAX8648 include thermal shutdown, open-
and short-circuit protection.
The MAX8647 features an I2C serial port, while the
MAX8648 features a three-wire serial-pulse logic inter-
face. Both devices support independent on/off and
dimming for main and subbacklights. The dimming
ranges are pseudo-logarithmic from 24mA to 0.1mA
and off in 32 steps. Both devices include a temperature
derating function to safely allow bright 24mA full-scale
output current setting while automatically reducing cur-
rent to protect LEDs at high ambient temperatures
above +60°C.
The MAX8647/MAX8648 are available in a 16-pin, 3mm
x 3mm thin QFN package (0.8mm max height).
Applications
White LED Backlighting, Single or Dual Display
Wide-Gamut RGB LED Display Backlighting
www.DataSheetC4Uam.coemra Flash or RGB Indicators
Cellular Phones and Smartphones
PDAs, Digital Cameras, and Camcorders
Pin Configuration
TOP VIEW
12 11 10 9
LED1 13
SDA (ENC) 14
SCL (ENB) 15
MAX8647ETE
MAX8648ETE
VDD (ENA) 16 +
1234
8 LED6
7 NEG
6 C1N
5 C2N
THIN QFN
( ) DESIGNATE PINS ON THE MAX8648
Features
Six Adaptive Current Regulators
Independent Voltage Supply for Each LED
Individual LED Brightness Control (MAX8647)
24mA to 0.1mA Dimming Range
I2C Interface (MAX8647)
Serial-Pulse Dimming Logic (MAX8648)
±2% Accuracy, ±0.4% Matching (typ)
Low 70µA Quiescent Current
Low 1µA Shutdown Current
Inrush Current Limit
TA Derating Function Protects LEDs
16-Pin, 3mm x 3mm Thin QFN Package
Ordering Information
PART
DIMMING
PIN
PACKAGE
TOP PKG
MARK CODE
MAX8647ETE+ I2C interface 16 Thin QFN-EP* AFD T1633-5
MAX8648ETE+
Serial-pulse
logic
16 Thin QFN-EP*
AFE
T1633-5
Note: All devices are specified over the -40°C to +85°C extended
temperature range.
+Denotes a lead-free package.
*EP = Exposed paddle.
Typical Operating Circuit
INPUT
2.7V TO 5.5V
1μF
SERIAL-
PULSE
INTERFACE
1μF 1μF
C1P
IN
GND
C1N C2P
C2N
NEG
EP
MAX8648
LED1
LED2
ENA LED3
ENB LED4
ENC LED5
LED6
1μF
WHITE
OR RGB LED
D1
D2
D3
D4
D5
D6
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8648 Datasheet

(MAX8647 / MAX8648) Ultra-Efficient Charge Pumps

No Preview Available !

Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
ABSOLUTE MAXIMUM RATINGS
VDD, IN, SCL, SDA, ENA, ENB, ENC to GND........-0.3V to +6.0V
VDD, IN, SCL, SDA, ENA, ENB, ENC to NEG ........-0.3V to +6.0V
NEG to GND .............................................................-6V to +0.3V
C2N to GND .............................................................-6V to +0.3V
C1P, C2P to GND .......................................-0.3V to (VIN + 0.3V)
C2P to C1N ..................................................-0.3V to (VIN + 0.3V)
LED_, C1N, C2N to NEG .............................-0.3V to (VIN + 0.3V)
Continuous Power Dissipation (TA = +70°C)
16-Pin Thin QFN 3mm x 3mm (derate 20.8mW/°C
above +70°C).............................................................1667mW
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(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
IN Operating Voltage
VDD Operating Voltage
Undervoltage-Lockout (UVLO)
Threshold
VIN rising
2.7 5.5
1.7 5.5
2.35 2.45 2.55
Undervoltage-Lockout Hysteresis
100
IN Shutdown Supply Current
(All Outputs Off)
VDD Shutdown Supply Current
www.DatIaNShOepeet4raUt.incogmSupply Current
VSCL = VSDA = VDD (MAX8647), TA = +25°C
VEN_ = 0V (MAX8648)
TA = +85°C
TA = +25°C
TA = +85°C
Charge pump inactive, two LEDs enabled at 0.1mA
setting
Charge pump active, 1MHz switching, all LEDs
enabled at 0.1mA setting
0.4 2.5
0.4
0.1 1.0
0.1
70 100
1.6
VDD Operating Supply Current
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
I2C INTERFACE (MAX8647)
Charge pump inactive, two LEDs enabled at 0.1mA
setting, TA = +25°C
Charge pump active, 1MHz switching, all LEDs
enabled at 0.1mA setting, TA = +85°C
Logic-Input High Voltage (SDA, SCL) VDD = 1.7V to 5.5V, hysteresis = 0.2 x VDD (typ)
0.7 x
VDD
0.1
0.1
+160
20
1.0
Logic-Input Low Voltage (SDA, SCL)
Filtered Pulse Width (tSP)
Logic-Input Current (SDA, SCL)
VDD = 1.7V to 5.5V, hysteresis = 0.2 x VDD (typ)
VIN = 2.7V to 5.5V, VDD = 1.7V to 5.5V (Note 2)
VIL = 0V or VIH = 5.5V
TA = +25°C
TA = +85°C
0.3 x
VDD
50
-1 0.01 +1
0.1
UNITS
V
V
V
mV
µA
µA
µA
mA
µA
°C
°C
V
V
ns
µA
2 _______________________________________________________________________________________


Part Number MAX8648
Description (MAX8647 / MAX8648) Ultra-Efficient Charge Pumps
Maker Maxim Integrated Products
PDF Download

MAX8648 Datasheet PDF






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