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MAX6946：10-Port, Constant-Current LED Driver and I/O Expander with PWM Intensity Control

Space-Saving, Constant-Current LED Driver with Reset

The MAX6946/MAX6947 I²C-/SMBus™-compatible, serial-interfaced peripherals provide microprocessors with 10 I/O ports rated to 7V. Each port can be configured as a 2.5mA to 20mA constant-current LED driver (static or PWM), a 1.25mA to 10mA constant-current LED driver (static or PWM), an open-drain logic output, or an overvoltage-protected Schmitt logic input. Analog and switching LED intensity control includes individual 8-bit PWM control per output, individual 1-bit analog current control (half/full scale) per output, and a global 3-bit DAC current control that applies to all LED outputs. The MAX6946/MAX6947 can stagger the PWM timing of the 10-port outputs in consecutively phased 45° increments. Staggering the outputs spreads the PWM load currents over time in eight steps, helping to even out the power-supply current and reduce the RMS current. For a similar part with an SPI™-/QSPI™-/ or MICROWIRE™-compatible interface, refer to the MAX6966/MAX6967 data sheet.

Key Features 2.25V to 3.6V Operation I/O Ports Default to High Impedance (LEDs Off) on Power-Up I/O Port Inputs Are Overvoltage Protected to 7V I/O Port Outputs Are 7V-Rated Open-Drain, 10mA or 20mA Constant-Current Static/PWM LED Drivers, or Open-Drain Logic Outputs I/O Ports Support Hot Insertion Individual 8-Bit PWM Intensity Control for Each LED Active-Low RST Input Clears Serial Interface and Can Exit Shutdown (Warm Start) MAX6946 OSC Input Allows for External PWM Clock Input MAX6947 AD0 Input Selects from Two Slave Addresses Auto Ramp-Up Out of Shutdown, and Up to 4s Hold-Off Before Ramp-Down into Shutdown 0.8µA (typ) Shutdown Current -40°C to +125°C Temperature Range Tiny WLP Package (4 x 4 Grid)

MAX6946, MAX6947: Typical Operating Circuit Applications/Uses Cellular Phones Keypad Backlights LCD Backlights LED Status Indicators Portable Equipment RGB LED Drivers

DataSheet

Parametrics

Design kits & evaluation modules

• MAX6946EVKIT

Related Products

• MAX6964：17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection
• MAX6965：9-Output LED Driver with Intensity Control and Hot-Insertion Protection
• MAX7300：2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander
• MAX6956：2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander
• MAX7301：4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander
• MAX6957：4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander

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