MAX8648ETE+ Maxim Integrated Products, MAX8648ETE+ Datasheet - Page 12
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MAX8648ETE+
Manufacturer Part Number
MAX8648ETE+
Description
IC LED DRVR WT/RGB BCKLGT 16TQFN
Manufacturer
Maxim Integrated Products
Type
Backlight, White LED, RGB (Serial Interface)r
Datasheet
1.MAX8647ETE.pdf
(15 pages)
Specifications of MAX8648ETE+
Constant Current
Yes
Topology
PWM, Switched Capacitor (Charge Pump)
Number Of Outputs
6
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
RGB, White LED
Frequency
1MHz
Voltage - Supply
1.7 V ~ 5.5 V
Voltage - Output
5V
Mounting Type
Surface Mount
Package / Case
16-TQFN Exposed Pad
Operating Temperature
-40°C ~ 85°C
Current - Output / Channel
24mA
Internal Switch(s)
Yes
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Supply Current
1.6 mA
Maximum Power Dissipation
1667 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Efficiency
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
Ceramic capacitors are recommended due to their small
size, low cost, and low ESR. Select ceramic capacitors
that maintain their capacitance over temperature and
DC bias. Capacitors with X5R or X7R temperature char-
acteristics generally perform well. Recommended val-
ues are shown in the Typical Operating Circuit . Using a
larger value input capacitor helps to reduce input ripple
(see the Input Ripple section).
It is not necessary for the LED anodes to connect to IN.
Figure 7 shows an example using separate supplies to
power the LED_ groups of the MAX8648. In this exam-
ple, the voltage source (V1) provides power for RGB
LEDs (LED1, LED2, and LED3). V2 provides power for
backlight LEDs (LED4 and LED5), and V3 provides
power for a red charge indicator (LED6).
The MAX8647/MAX8648 have a high-frequency,
switched-capacitor voltage inverter. For best circuit per-
formance, use a solid copper plane and place C1–C4 as
close as possible to the MAX8647/MAX8648. Figure 4
shows the MAX8648 evaluation kit example layout.
12
Figure 3. EN_ Timing Diagram
______________________________________________________________________________________
I
LED_
EN
_
Driving LEDs with Multiple Supplies
0mA
0
INITIAL t
> 120μs
HI
PCB Layout and Routing
24mA
1
Capacitor Selection
22.4
2
20.8
3
19.2
4
17.6
5
16.0
t
1μs TO 500μs
LO
0.6
PROCESS: BiCMOS
Figure 4. MAX8648 Evaluation Kit Layout for C1–C4
26
0.5
27
0.4
t
> 1μs
HI
28
0.3
29
0.2
30
0.1mA
31
24mA 22.4
Chip Information
t
SHDN
4ms
0mA