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MAX8648ETE+

P1-P3P4-P6P7-P9P10-P12P13-P15
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 I
2
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).
Applications
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
Features
♦ Six Adaptive Current Regulators
♦ Independent Voltage Supply for Each LED
♦ Individual LED Brightness Control (MAX8647)
♦ 24mA to 0.1mA Dimming Range
I
2
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
A
Derating Function Protects LEDs
♦ 16-Pin, 3mm x 3mm Thin QFN Package
MAX8647/MAX8648
Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
________________________________________________________________
Maxim Integrated Products
1
15
16
14
13
5
6
7
C1P
C2P
8
IN
LED4
LED5
LED2
13
SDA (ENC)
( ) DESIGNATE PINS ON THE MAX8648
4
12 10 9
SCL (ENB)
V
DD
(ENA)
LED6
NEG
C1N
C2N
MAX8647ETE
MAX8648ETE
GND LED3
2
11
LED1
THIN QFN
TOP VIEW
+
Pin Configuration
19-0790; Rev 1; 9/07
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.
EVALUATION KIT
AVAILABLE
Ordering Information
Note: All devices are specified over the -40°C to +85°C extended
temperature range.
+
Denotes a lead-free package.
*
EP = Exposed paddle.
PART DIMMING
PIN
PACKAGE
TOP
MARK
PKG
CODE
M A X8 6 4 7 E TE + I
2
C interface 16 Thi n QFN- E P * AFD T1633- 5
M A X8 6 4 8 E TE +
S eri al -p ul se
l ogi c
16 Thi n QFN- E P * AFE T1633- 5
WHITE
OR RGB LED
EP
LED3
1μF
IN
GND
LED4
LED5
LED6
D6
LED2
MAX8648
D4
D5
D3
D2
D1
LED1
NEG
INPUT
2.7V TO 5.5V
1μF
C1P C1N
1μF
C2P C2N
1μF
SERIAL-
PULSE
INTERFACE
ENA
ENB
ENC
Typical Operating Circuit
MAX8647/MAX8648
Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
VDD
= V
IN
= 3.6V, V
GND
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
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.
V
DD
, IN, SCL, SDA, ENA, ENB, ENC to GND........-0.3V to +6.0V
V
DD
, 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 (V
IN
+ 0.3V)
C2P to C1N..................................................-0.3V to (V
IN
+ 0.3V)
LED_, C1N, C2N to NEG .............................-0.3V to (V
IN
+ 0.3V)
Continuous Power Dissipation (T
A
= +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
PARAMETER CONDITIONS MIN TYP MAX UNITS
IN Operating Voltage 2.7 5.5 V
V
DD
Operating Voltage 1.7 5.5 V
Undervoltage-Lockout (UVLO)
Threshold
V
IN
rising 2.35 2.45 2.55 V
Undervoltage-Lockout Hysteresis 100 mV
T
A
= +25°C 0.4 2.5
IN Shutdown Supply Current
(All Outputs Off)
V
SCL
= V
SDA
= V
DD
(MAX8647),
V
EN
_ = 0V (MAX8648)
T
A
= +85°C 0.4
µA
T
A
= +25°C 0.1 1.0
V
DD
Shutdown Supply Current
T
A
= +85°C 0.1
µA
Charge pump inactive, two LEDs enabled at 0.1mA
setting
70 100 µA
IN Operating Supply Current
Charge pump active, 1MHz switching, all LEDs
enabled at 0.1mA setting
1.6 mA
Charge pump inactive, two LEDs enabled at 0.1mA
setting, T
A
= +25°C
0.1 1.0
V
DD
Operating Supply Current
Charge pump active, 1MHz switching, all LEDs
enabled at 0.1mA setting, T
A
= +85°C
0.1
µA
Thermal-Shutdown Threshold +160 °C
Thermal-Shutdown Hysteresis 20 °C
I
2
C INTERFACE (MAX8647)
Logic-Input High Voltage (SDA, SCL) V
DD
= 1.7V to 5.5V, hysteresis = 0.2 x V
DD
(typ)
0.7 x
V
DD
V
Logic-Input Low Voltage (SDA, SCL) V
DD
= 1.7V to 5.5V, hysteresis = 0.2 x V
DD
(typ)
0.3 x
V
DD
V
Filtered Pulse Width (t
SP
)V
IN
= 2.7V to 5.5V, V
DD
= 1.7V to 5.5V (Note 2) 50 ns
T
A
= +25°C -1 0.01 +1
Logic-Input Current (SDA, SCL) V
IL
= 0V or V
IH
= 5.5V
T
A
= +85°C 0.1
µA
MAX8647/MAX8648
Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
VDD
= V
IN
= 3.6V, V
GND
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
SDA Output Low Voltage I
SDA
= 3mA, for acknowledge (Note 2) 0.03 0.40 V
I
2
C Clock Frequency 400 kHz
Bus Free Time Between START and
STOP (t
BUF
)
(Note 2) 1.3 µs
Hold Time Repeated START Condition
(t
HD_STA
)
(Note 2) 0.6 0.1 µs
SCL Low Period (t
LOW
) (Note 2) 1.3 0.2 µs
SCL High Period (t
HIGH
) (Note 2) 0.6 0.2 µs
Setup Time Repeated START
Condition (t
SU_STA
)
(Note 2) 0.6 0.1 µs
SDA Hold Time (t
HD_DAT
) (Note 2) 0 -0.01 µs
SDA Setup Time (t
SU_DAT
) (Note 2) 100 50 ns
Setup Time for STOP Condition
(t
SU_STO
)
(Note 2) 0.6 0.1 µs
SERIAL-PULSE LOGIC (EN_) (MAX8648)
Logic-Input High Voltage V
IN
= 2.7V to 5.5V 1.4 V
Logic-Input Low Voltage V
IN
= 2.7V to 5.5V 0.4 V
T
A
= +25°C -1 0.01 +1
Logic-Input Current V
IL
= 0V or V
IH
= 5.5V
T
A
= +85°C 0.1
µA
EN Low Shutdown Delay t
SHDN
See Figure 3 and the Shutdown Mode section; EN_
needs to be longer than 4ms to ensure LED is
powered off
4ms
t
LO
(Figure 3) 1 500 µs
t
HI
(Figure 3) 1µs
Initial t
HI
(Figure 3) First EN_ high pulse 120 µs
CHARGE PUMP
Switching Frequency 1 MHz
Soft-Start Time 0.5 ms
Charge-Pump Regulation Voltage (V
IN
- V
NEG
) 4.3 5.0 V
Open-Loop NEG Output Resistance (V
NEG
- 0.5 x V
IN
) / I
NEG
2.5 5 Ω
NEG Discharge Resistance in
Shutdown or When the Charge Pump
is Inactive
All LEDs off, EN_ = GND 10 kΩ
LED1–LED6 CURRENT REGULATOR
Current Setting Range Through an I
2
C or serial-pulse interface 0.1 24.0 mA
24mA setting, T
A
= +25°C -2 ±1 +2
24mA setting, T
A
= -40°C
to derating function start
temperature (Note 2)
-5 +5
Current Accuracy
V
LED_
= 0.5V for
charge-pump inactive,
V
LED_
= -0.9V,
V
NEG_
= -1.4V
1.6mA setting, T
A
= +25°C -15 ±5 +15
%
P1-P3P4-P6P7-P9P10-P12P13-P15

MAX8648ETE+

Mfr. #:
Buy MAX8648ETE+
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers Charge Pump for 6 White/RGB LEDs
Lifecycle:
New from this manufacturer.
Delivery:
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