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MAX6946, 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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Status
Active: In Production.
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.
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Data Sheet
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An evaluation kit is available: MAX6946EVKIT
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)
- Underwriters Laboratories (UL) Recognized
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Applications/Uses
- Cellular Phones
- Keypad Backlights
- LCD Backlights
- LED Status Indicators
- Portable Equipment
- RGB LED Drivers
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Key Specifications:
| I/O Port Expanders |
| Part Number |
Interface |
I/O |
Reset Input |
Over Voltage Protect. |
Drive Current
(mA) |
VSUPPLY
(V) |
VSUPPLY
(V) |
Budgetary Price |
| min |
max |
See Notes |
| MAX6947 NEW! |
Serial - I2C Compatible |
10 |
- |
7V |
20 |
2.25 |
3.6 |
$2.05 @1k |
| MAX6946 |
- |
Yes |
$1.71 @1k |
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See All I/O Port Expanders (35)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-0598
Rev 3;
2008-02-15
This page last modified: 2008-02-15
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