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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6948B Datasheet

High-Efficiency PWM LED Driver

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EVALUATION KIT AVAILABLE
MAX6948B
High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
General Description
The MAX6948B general-purpose input/output (GPIO)
peripheral drives a series string of white LEDs (WLEDs),
and contains up to five general-purpose input/output
(GPIO) ports to drive additional LEDs.
The integrated 2MHz boost converter minimizes the size
and cost of external components and supplies 30mA of
load current at up to 28V. The converter is stable under
all load conditions from 5V up to 28V and includes
open-circuit detection to prevent damage to the IC. An
I2C-programmable 10-bit pulse-width modulation (PWM)
signal enables 1024 levels of WLED intensity.
The five GPIO ports function as logic inputs, open-
drain logic outputs, or constant-current sinks in any
combination. Ports withstand 5.5V independent of the
MAX6948B’s supply voltage. Two of the ports drive addi-
tional LEDs up to 30mA/port, while the other three ports
drive LEDs at up to 10mA/port. The MAX6948B features
shutdown and standby modes for low-power dissipa-
tion. The constant-current drivers contain programmable
PWM outputs and allow staggering to reduce the input
peak-current requirements. The I/O ports also feature
ramp-up and ramp-down controls.
The MAX6948B features a single input to select from four
I2C slave addresses. Programming and functionality for
the five GPIO ports is identical to the MAX6946/MAX6947
I/O expanders.
The MAX6948B is available in a 25-bump (2.31mm x
2.31mm) WLP package for cell phones, PDAs, and
other portable consumer electronic applications. The
MAX6948B operates over the -40NC to +105NC tempera-
ture range.
Applications
LED Backlighting for LCDs
Cell Phones
PDAs
Handheld Games
Portable Consumer Electronics
Features
S 28V Step-Up DC-DC Converter with Integrated
nMOS Power Switch
S Built-In 10-Bit PWM Control for Improved Efficiency
S No Discharge Path During PWM Off Period for
Increased Battery Life
S Fixed 2MHz Switching for Smaller Components
Drives up to 6 Series WLEDs
S ±8kV Human Body Model (HBM) ESD Protection
for GPIOs and Boost-Converter Output
S Five Open-Drain GPIOs Capable of Constant-
Current LED Drive with Individual 8-Bit PWM
Intensity Control
S 2.7V to 5V Power-Supply Operation
S 400kbps, 5.5V Tolerant I2C Interface
S Four I2C Slave Address Choices
S RST Input Clears Serial Interface and Exits
Shutdown (Reset-Run Option)
S Small (2.31mm x 2.31mm) WLP Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX6948BGWA+ -40NC to +105NC
25 WLP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
2.7V TO 5.0V
10µH
2.2FF
LX OUT
0.22FF
V+ PGND
MAX6948B
SCL FB
RB
SDA LEDSW
1.7V TO V+
0.1FF
RST
VDD
COMP
47nF
P0
P1
P2
P3
AD0 P4
GND
VEXT
B
G
R
NOTE: RB = 0.2V/ILED = 0.2V/0.03A = 6.7I.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-4935; Rev 0; 9/09


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6948B Datasheet

High-Efficiency PWM LED Driver

No Preview Available !

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
VDD, 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 (VDD + 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 (TA = +70NC)
25-Bump WLP (derate 10.8mW/NC above +70NC).......866mW
Junction-to-Ambient Thermal Resistance (BJA) (Note 2)
25-Bump WLP...............................................................93NC/W
Operating Temperature Range
(TMIN to TMAX)............................................... -40NC to +105NC
Junction Temperature......................................................+150NC
Storage Temperature Range............................. -65NC to +150NC
ESD Protection
Human Body Model (RD = 1.5kI, CS = 100pF)
P0–P4, OUT, LEDSW, FB to GND.................................Q8kV
All Other Pins.................................................................Q2kV
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, VDD = 1.7V to V+, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
V+ = 3.3V, VDD = 2.5V, TA = +25NC.) (Note 4)
PARAMETER
Operating Supply Voltage (V+)
Operating Supply Voltage (VDD)
Output Load External Supply
Voltage
Port External Supply Voltage
Port Voltage (P0, P4)
Power-On-Reset Voltage
SYMBOL
V+
VDD
CONDITIONS
VOUT Boost-converter output
VEXT
VPORT
VPOR
P0–P4 at high impedance
Constant-current on
Voltage rising
MIN TYP MAX UNITS
2.7 3.3 5.0
V
1.7 2.5 V+
V
28 V
5.5
V+
1.7
V
V
V
Standby Current
ISTBY
Standby mode,
boost converter off,
RST = VDD, all digi-
tal inputs at VDD or
GND
TA = +25NC
TA = TMIN to TMAX
1.5 4
6
FA
Standby Current in Reset
(Interface Active)
Standby mode,
RST = GND,
TA = +25NC
IRST
fSCL = 400kHz, all
other digital inputs
at VDD or GND
TA = TMIN to TMAX
1.6 4
6
FA
2   Maxim Integrated


Part Number MAX6948B
Description High-Efficiency PWM LED Driver
Maker Maxim Integrated Products
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