MAX6946/MAX6947 19-0598 Rev 3 2/08 10-Port, Constant-Current LED Driver and I/O Expander with PWM Intensity Control General Description Features TM 2 2.25V to 3.6V Operation The MAX6946/MAX6947 I C-/SMBus -compatible, serial-interfaced peripherals provide microprocessors I/O Ports Default to High Impedance (LEDs Off) with 10 I/O ports rated to 7V. on Power-Up I/O Port Inputs Are Overvoltage Protected to 7V Each port can be configured as a 2.5mA to 20mA con- stant-current LED driver (static or PWM), a 1.25mA to I/O Port Outputs Are 7V-Rated Open-Drain, 10mA or 20mA Constant-Current Static/PWM LED 10mA constant-current LED driver (static or PWM), an Drivers, or Open-Drain Logic Outputs open-drain logic output, or an overvoltage-protected Schmitt logic input. I/O Ports Support Hot Insertion Individual 8-Bit PWM Intensity Control for Each LED Analog and switching LED intensity control includes indi- vidual 8-bit PWM control per output, individual 1-bit ana- RST Input Clears Serial Interface and Can Exit log current control (half/full scale) per output, and a global Shutdown (Warm Start) 3-bit DAC current control that applies to all LED outputs. MAX6946 OSC Input Allows for External PWM Clock Input The MAX6946/MAX6947 can stagger the PWM timing of MAX6947 AD0 Input Selects from Two Slave the 10-port outputs in consecutively phased 45 incre- Addresses ments. Staggering the outputs spreads the PWM load currents over time in eight steps, helping to even out Auto Ramp-Up Out of Shutdown, and Up to 4s Hold-Off Before Ramp-Down into Shutdown the power-supply current and reduce the RMS current. TM TM TM 0.8A (typ) Shutdown Current For a similar part with an SPI -/QSPI -/ or MICROWIRE - compatible interface, refer to the MAX6966/MAX6967 -40C to +125C Temperature Range data sheet. Tiny WLP Package (4 x 4 Grid) Applications Ordering Information Cellular Phones LCD Backlights PKG PART PIN-PACKAGE Portable Equipment Keypad Backlights CODE RGB LED Drivers LED Status Indicators MAX6946ATE+ 16 TQFN-EP* T1633-4 MAX6946CAWE+ 16 WLP W162B2-1 Typical Operating Circuit MAX6947ATE+ 16 TQFN-EP* T1633-4 +Denotes a lead-free package. +3.3V V = +5V EXT *EP = Exposed pad. Note: All devices are specified over the -40C to +125C operating V DD temperature range.. C P0 Pin Configurations P1 SCL SCL P2 MAX6946 SDA SDA P3 LOGIC INPUT TOP VIEW MAX6947 P4 LOGIC INPUT OSC* P5 LOGIC INPUT RST MAX6946C P6 LOGIC INPUT P7 LOGIC INPUT A1 A2 A3 A4 P8 LOGIC INPUT AD0** P9 LOGIC INPUT RST VDD SCL SDA GND *MAX6946 ONLY. B1 B2 B3 B4 **MAX6947 ONLY. P9 P1 OSC P0 C1 C2 C3 C4 SMBus is a trademark of Intel Corp. P8 P7 P3 P2 SPI and QSPI are trademarks of Motorola, Inc. D1 D2 D3 D4 MICROWIRE is a trademark of National Semiconductor Corp. P6 P5 GND P4 (BUMPS ON BOTTOM) 16-BUMP, 2.1mm x 2.1mm WLP Pin Configurations continued at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE10-Port, Constant-Current LED Driver and I/O Expander with PWM Intensity Control ABSOLUTE MAXIMUM RATINGS VDD to GND .............................................................-0.3V to +4V Continuous Power Dissipation (T = +70C) A SCL, SDA, AD0, RST, OSC to GND .........................-0.3V to +6V 16-Pin TQFN (derate 14.7mW/C over +70C) ..........1176mW P0 to P9 to GND .......................................................-0.3V to +8V 16-Bump WLP (derate 13.3mW/C over +70C)........1066mW DC Current into P0 to P9 ....................................................24mA Operating Temperature Range (T , T )....-40C to +125C MIN MAX DC Current into SDA...........................................................10mA Junction Temperature......................................................+150C RST Sink Current.................................................................10mA Storage Temperature Range .............................-65C to +150C Total GND Current ............................................................280mA Lead Temperature (soldering, 10s) .................................+300C 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. ELECTRICAL CHARACTERISTICS (V = 2.25V to 3.6V, T = T to T , unless otherwise noted. Typical values are at V = 3.3V, T = +25C.) (Note 1) DD A MIN MAX DD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage V 2.25 3.60 V DD Output Load External Supply V 7V EXT Voltage P0P9 Power-On-Reset Voltage V V rising 1.91 V POR DD 16-pin TQFN 128 Power-On-Reset Voltage Hysteresis PORHYS mV 16-bump WLP 33 T = +25C 1.0 1.3 A Standby Current Interface Idle RST at VDD (PWM Disabled, All Ports High I f = 0Hz other digital T = T to +85C 1.3 A STBY SCL A MIN Impedance) inputs at VDD or GND T = T to T 1.5 A MIN MAX T = +25C 17 23 A Standby Current in Reset RST at GND f = SCL (PWM Disabled, All Ports High I 400kHz other digital T = T to +85C 24 A RST A MIN Impedance) inputs at VDD or GND T = T to T 25 A MIN MAX T = +25C 50 60 A Supply Current Interface Active f = 400kHz other SCL (Reset Run Enabled, PWM I digital inputs at VDD or T = T to +85C 62 A DD A MIN Disabled, All Ports High GND Impedance) T = T to T 65 A MIN MAX One port set to 10mA T = +25C 1.58 1.8 A constant current all other ports output registers set I T = T to +85C 1.9 DD10 A MIN to 0x00, 0x01, or 0xFF digital inputs at VDD or T = T to T 2.0 A MIN MAX GND Delta Supply Current Interface Idle mA One port set to 20mA T = +25C 3.2 3.6 A constant current all other ports output registers set I T = T to +85C 3.8 DD20 A MIN to 0x00, 0x01, or 0xFF digital inputs at VDD or T = T to T 4.0 A MIN MAX GND 2 MAX6946/MAX6947