MAX6947:10-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
MAX6946, MAX6947: Typical Operating Circuit
Applications/Uses
  • Cellular Phones
  • Keypad Backlights
  • LCD Backlights
  • LED Status Indicators
  • Portable Equipment
  • RGB LED Drivers
DataSheet
titleDownload file
MAX6946-MAX6947 Data SheetMAX6946-MAX6947.pdf
Parametrics
Part NumberInterfaceI/OReset InputOver Voltage Protection
(V)
Drive Current
(mA)
VSUPPLY
(V)
VSUPPLY
(V)
Package/PinsBudgetary
Price
minmaxSee Notes
MAX6947Serial - I2C Compatible10-7202.253.6TQFN/16$2.74 @1k
MAX6946-YesTQFN/16
WLP/16
$2.30 @1k
Design kits & evaluation modules
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
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX6947ATE+ActiveTQFN,;16 pin;9.6 mm²-40°C to +125°CLead Free
MAX6947ATE+TActiveTQFN,;16 pin;9.6 mm²-40°C to +125°CLead Free
MAX6946-MAX6947.pdf MAX6947
MAX6946-MAX6947.pdf MAX6947