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

Space-Saving, Constant-Current LED Driver with Reset

Product Details

Key Features

Parametric specs for I/O Port Expanders
Interface Serial - I2C Compatible
Reset Input Yes
Over Voltage Protection (V) 7
Drive Current (mA) 20
VSUPPLY (V) (min) 2.25
VSUPPLY (V) (max) 3.6
Package/Pins TQFN/16
Budgetary
Price (See Notes)
2.83
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Simplified Block Diagram

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Parameters

Parametric specs for I/O Port Expanders
Interface Serial - I2C Compatible
Reset Input Yes
Over Voltage Protection (V) 7
Drive Current (mA) 20
VSUPPLY (V) (min) 2.25
VSUPPLY (V) (max) 3.6
Package/Pins TQFN/16
Budgetary
Price (See Notes)
2.83

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)

Applications/Uses

  • Cellular Phones
  • Keypad Backlights
  • LCD Backlights
  • LED Status Indicators
  • Portable Equipment
  • RGB LED Drivers

Description

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.

Simplified Block Diagram

MAX6946, MAX6947: Typical Operating Circuit MAX6946, MAX6947: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.