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MAX6948B
High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
ABSOLUTE MAXIMUM RATINGS
V+ to GND ...............................................................-0.3V to +6V
V DD , COMP to GND ....................................-0.3V to (V+ + 0.3V)
PGND to GND ......................................................-0.3V to +0.3V
LX to PGND (Note 1) .............................................-0.3V to +30V
Current into LX (Note 1) ...................................................700mA
OUT, LEDSW to PGND (Note 1) ...........................-0.3V to +30V
P0–P4 to GND .........................................................-0.3V to +6V
RST , SDA, SCL, AD0 to GND .................. -0.3V to (V DD + 0.3V)
FB to PGND (Note 1)............................................-0.3V to +0.3V
I.C. to GND ...........................................................-0.3V to +0.3V
DC Current on P0–P4 .........................................................50mA
DC Current on SDA ............................................................10mA
Total GND Current............................................................150mA
Total PGND Current .........................................................150mA
Continuous Power Dissipation (T A = +70 N C)
25-Bump WLP (derate 10.8mW/ N C above +70 N C) ......866mW
Junction-to-Ambient Thermal Resistance ( B JA ) (Note 2)
25-Bump WLP ..............................................................93 N C/W
Operating Temperature Range
(T MIN to T MAX ) .............................................. -40 N C to +105 N C
Junction Temperature .....................................................+150 N C
Storage Temperature Range............................ -65 N C to +150 N C
ESD Protection
Human Body Model (R D = 1.5k I , C S = 100pF)
P0–P4, OUT, LEDSW, FB to GND ................................ Q 8kV
All Other Pins ................................................................ Q 2kV
Lead Temperature (soldering, 10s)
25-Bump WLP ............................................................. (Note 3)
Note 1: LX, FB, LEDSW pins have an internal clamp diode to PGND. Applications that forward bias these diodes should take care
not to exceed the power dissipation limits of the device.
Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a
single-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/
thermal-tutorial .
Note 3: Refer to the Pb-free solder reflow requirement in J-STD -020, Rev D.1.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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
( Typical Application Circuit , V+ = 2.7V to 5.0V, V DD = 1.7V to V+, T A = T MIN to T MAX , unless otherwise noted. Typical values are at
V+ = 3.3V, V DD = 2.5V, T A = +25 N C.) (Note 4)
PARAMETER
Operating Supply Voltage (V+)
Operating Supply Voltage (V DD )
SYMBOL
V+
V DD
CONDITIONS
MIN
2.7
1.7
TYP
3.3
2.5
MAX
5.0
V+
UNITS
V
V
Output Load External Supply
Voltage
Port External Supply Voltage
Port Voltage (P0, P4)
Power-On-Reset Voltage
Standby Current
V OUT
V EXT
V PORT
V POR
I STBY
Boost-converter output
P0–P4 at high impedance
Constant-current on
Voltage rising
Standby mode,
T A = +25 N C
boost converter off,
RST = V DD , all digi-
tal inputs at V DD or
T A = T MIN to T MAX
GND
1.7
1.5
28
5.5
V+
4
6
V
V
V
V
F A
Standby Current in Reset
(Interface Active)
I RST
Standby mode,
RST = GND,
f SCL = 400kHz, all
other digital inputs
at V DD or GND
T A = +25 N C
T A = T MIN to T MAX
1.6
4
6
F A
2
Maxim Integrated
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