MAX6947
10-Port, Constant-Current LED Driver and I/O Expander with PWM Intensity Control
Space-Saving, Constant-Current LED Driver with Reset
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Overview
Features and Benefits
- 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)
Product Details
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.
Applications
- Cellular Phones
- Keypad Backlights
- LCD Backlights
- LED Status Indicators
- Portable Equipment
- RGB LED Drivers
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
Product Recommendations
MAX6947 Companion Parts
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| MAX6947ATE+ | Material Declaration | Reliability Data | Thin Quad Flatpack, No Leads | |
| MAX6947ATE+T | Material Declaration | Reliability Data | Thin Quad Flatpack, No Leads | |
| Wafer Fabrication Data |
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.