IC LED DRVR WT/RGB BCKLGT 16TQFN

MAX8647ETE+

Manufacturer Part NumberMAX8647ETE+
DescriptionIC LED DRVR WT/RGB BCKLGT 16TQFN
ManufacturerMaxim Integrated Products
TypeBacklight, White LED, RGB (I²C Interface)
MAX8647ETE+ datasheet
 


Specifications of MAX8647ETE+

Constant CurrentYesTopologyPWM, Switched Capacitor (Charge Pump)
Number Of Outputs6Internal DriverYes
Type - PrimaryBacklightType - SecondaryRGB, White LED
Frequency1MHzVoltage - Supply1.7 V ~ 5.5 V
Voltage - Output5VMounting TypeSurface Mount
Package / Case16-TQFN Exposed PadOperating Temperature-40°C ~ 85°C
Current - Output / Channel24mAInternal Switch(s)Yes
Operating Supply Voltage2.7 V to 5.5 VMaximum Supply Current1.6 mA
Maximum Power Dissipation1667 mWMaximum Operating Temperature+ 85 C
Mounting StyleSMD/SMTMinimum Operating Temperature- 40 C
Lead Free Status / RoHS StatusLead free / RoHS CompliantEfficiency-
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19-0790; Rev 1; 9/07
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.
2
The MAX8647 features an I
C 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).
White LED Backlighting, Single or Dual Display
Wide-Gamut RGB LED Display Backlighting
Camera Flash or RGB Indicators
Cellular Phones and Smartphones
PDAs, Digital Cameras, and Camcorders
Pin Configuration
TOP VIEW
12
11
10
13
LED1
14
SDA (ENC)
MAX8647ETE
SCL (ENB)
15
MAX8648ETE
V
(ENA)
16
+
DD
1
2
3
THIN QFN
( ) DESIGNATE PINS ON THE MAX8648
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
Ultra-Efficient Charge Pumps for
♦ Six Adaptive Current Regulators
♦ Independent Voltage Supply for Each LED
♦ Individual LED Brightness Control (MAX8647)
♦ 24mA to 0.1mA Dimming Range
2
I
C Interface (MAX8647)
Serial-Pulse Dimming Logic (MAX8648)
♦ ±2% Accuracy, ±0.4% Matching (typ)
♦ Low 70µA Quiescent Current
♦ Low 1µA Shutdown Current
♦ Inrush Current Limit
♦ T
Derating Function Protects LEDs
A
♦ 16-Pin, 3mm x 3mm Thin QFN Package
PART
M A X8 6 4 7 E TE + I
M A X8 6 4 8 E TE +
Note: All devices are specified over the -40°C to +85°C extended
Applications
temperature range.
+ Denotes a lead-free package.
* EP = Exposed paddle.
INPUT
2.7V TO 5.5V
1μF
9
LED6
8
7
NEG
C1N
6
C2N
5
SERIAL-
PULSE
4
INTERFACE
Features
Ordering Information
PIN
TOP
DIMMING
PACKAGE
MARK
CODE
2
C interface 16 Thi n QFN- E P *
AFD
T1633- 5
S eri al -p ul se
16 Thi n QFN- E P *
AFE
T1633- 5
l ogi c
Typical Operating Circuit
1μF
1μF
C1P
C1N
C2P
C2N
1μF
NEG
IN
EP
GND
WHITE
OR RGB LED
MAX8648
D1
LED1
D2
LED2
D3
ENA
LED3
D4
ENB
LED4
D5
ENC
LED5
D6
LED6
PKG
1

MAX8647ETE+ Summary of contents

  • Page 1

    ... THIN QFN ( ) DESIGNATE PINS ON THE MAX8648 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. Ultra-Efficient Charge Pumps for ♦ Six Adaptive Current Regulators ♦ Independent Voltage Supply for Each LED ♦ ...

  • Page 2

    Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN ABSOLUTE MAXIMUM RATINGS V , IN, SCL, SDA, ENA, ENB, ENC to GND........-0.3V to +6. IN, SCL, SDA, ENA, ENB, ENC to NEG ........-0.3V ...

  • Page 3

    Six White/RGB LEDs in 3mm x 3mm Thin QFN ELECTRICAL CHARACTERISTICS (continued 3.6V 0V -40°C to +85°C, unless otherwise noted. Typical values are at T VDD IN GND A PARAMETER SDA Output ...

  • Page 4

    Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN ELECTRICAL CHARACTERISTICS (continued 3.6V 0V -40°C to +85°C, unless otherwise noted. Typical values are at T VDD IN GND ...

  • Page 5

    Six White/RGB LEDs in 3mm x 3mm Thin QFN (V = 3.6V circuit of Figure EN_ IN EFFICIENCY vs. SUPPLY VOLTAGE (DRIVING SIX LEDs) 100 20.8mA/LED 60 50 6.4mA/LED 40 ...

  • Page 6

    Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN (V = 3.6V circuit of Figure EN_ IN LED CURRENT vs. TEMPERATURE -40 ...

  • Page 7

    Six White/RGB LEDs in 3mm x 3mm Thin QFN PIN NAME MAX8647 MAX8648 GND 3 3 C1P 4 4 C2P 5 5 C2N 6 6 C1N 7 7 NEG 8–13 8–13 LED6–LED1 14 — SDA ...

  • Page 8

    Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN Detailed Description The MAX8647/MAX8648 have an inverting charge pump and six current regulators capable of 24mA each to drive six white LEDs or two sets of RGB ...

  • Page 9

    Six White/RGB LEDs in 3mm x 3mm Thin QFN C1P V IN 2. 1μF GND V (ENA SCL (ENB) SERIAL PULSE INTERFACE SDA (ENC) AND CONTROL MAX8647 MAX8648 ( ) ARE ...

  • Page 10

    Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN 2 Table Control Data Byte—Device Address 0x9A FUNCTION C2 Not used 0 LED1 current 0 LED2 current 0 LED3 current 0 LED4 current 1 ...

  • Page 11

    Six White/RGB LEDs in 3mm x 3mm Thin QFN LOW HIGH SCL SDA SU_STA HD_STA SU_DAT A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS ...

  • Page 12

    Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN INITIAL > 120μs 24mA 22.4 I LED_ 0mA Figure 3. EN_ Timing Diagram Capacitor Selection Ceramic capacitors are recommended due ...

  • Page 13

    Six White/RGB LEDs in 3mm x 3mm Thin QFN 1μF 1μF C1P C1N C2P C2N INPUT NEG 2.7V TO 5.5V IN 1μF GND MAX8647 LED1 2 LED2 SDA I C PORT ON/OFF AND BRIGHTNESS LED3 SCL LED4 V LOGIC 1.7V ...

  • Page 14

    Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) E MARKING E/2 AAAA ...

  • Page 15

    ... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2007 Maxim Integrated Products ...