MAX8648 Maxim Integrated Products, MAX8648 Datasheet

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MAX8648

Manufacturer Part Number
MAX8648
Description
(MAX8647 / MAX8648) Ultra-Efficient Charge Pumps
Manufacturer
Maxim Integrated Products
Datasheet

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Part Number:
MAX8648ETE+TG104
Manufacturer:
OSRAM
Quantity:
17
www.DataSheet4U.com
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 I
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).
19-0790; Rev 0; 4/07
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.
( ) DESIGNATE PINS ON THE MAX8648
TOP VIEW
Six White/RGB LEDs in 3mm x 3mm Thin QFN
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
SDA (ENC)
SCL (ENB)
V
DD
(ENA)
LED1
13
14
15
16
________________________________________________________________ Maxim Integrated Products
+
12
1
THIN QFN
General Description
MAX8647ETE
MAX8648ETE
11
2
Pin Configuration
2
10
3
C serial port, while the
9
4
Applications
Ultra-Efficient Charge Pumps for
8
7
6
5
LED6
NEG
C1N
C2N
♦ Six Adaptive Current Regulators
♦ Independent Voltage Supply for Each LED
♦ Individual LED Brightness Control (MAX8647)
♦ 24mA to 0.1mA Dimming Range
♦ ±2% Accuracy, ±0.4% Matching (typ)
♦ Low 70µA Quiescent Current
♦ Low 1µA Shutdown Current
♦ Inrush Current Limit
♦ T
♦ 16-Pin, 3mm x 3mm Thin QFN Package
Note: All devices are specified over the -40°C to +85°C extended
temperature range.
+ Denotes a lead-free package.
* EP = Exposed paddle.
M A X8 6 4 7 E TE + I
M A X8 6 4 8 E TE +
2.7V TO 5.5V
INTERFACE
A
INPUT
PART
SERIAL-
I
Serial-Pulse Dimming Logic (MAX8648)
PULSE
2
Derating Function Protects LEDs
1μF
C Interface (MAX8647)
2
S eri al -p ul se
DIMMING
Typical Operating Circuit
C interface 16 Thi n QFN- E P *
l ogi c
ENA
ENB
ENC
IN
GND
C1P
1μF
Ordering Information
C1N
MAX8648
PIN
PACKAGE
16 Thi n QFN- E P *
C2P
1μF
C2N
LED1
LED2
LED3
LED4
LED5
LED6
NEG
EP
MARK
TOP
Features
AFD
OR RGB LED
AFE
1μF
WHITE
D1
D2
D3
D4
D5
D6
T1633- 5
T1633- 5
CODE
PKG
1

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