AAT3164

High Efficiency 1X/1.5X/2X Charge Pump for Six-Channel White LED Applications

Please note: this product is being discontinued and is not recommended for new designs.

The AAT3164 is a low noise, constant frequency charge pump DC/DC converter that uses a tri-mode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency for white LED applications. The device is capable of driving up to six channels of LEDs at up to 30mA per channel from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher-current LEDs. A low external parts count (two 1µF flying capacitors and two small 1µF capacitors at IN and OUT) makes this part ideally suited for small, battery-powered applications.

AnalogicTech's patented single-wire Simple Serial Control™ (S²Cwire™) serial digital input is used to enable, disable, and set current for each LED with 16 levels from a maximum of 40mA down to 50µA. The maximum current level is programmed via an external resistor. To save power, the low-current mode supply current can be programmed as low as 70µA.

Each output of the AAT3164 is equipped with built-in protection for VOUT short-circuit and auto-disable for LED short-circuit conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1µA.

The AAT3164 is available in a Pb-free, space-saving, ultra-thin (3x4x0.75mm), and thermally-enhanced 16-pin TDFN package.

Please note: AAT3164 is not recommended for new designs.

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Specifications

Number of LEDs6
LED Channels6
LED(s) per/Ch1
Min. VIN (V)2.7
Max. VIN (V)5.5
InterfaceS2Cwire™
Typ. IQ (μA)70
Peak Efficiency94%
Current Accuracy (%)±7%
Current Matching (%)±0.5%
Max. IOUT per/Ch (mA)30
PackageTDFN, 16L
Package (mm)3 x 4 x 0.75
PackageTDFN34-16

Features

  • VIN Range: 2.7V to 5.5V
  • Tri-Mode (1X/1.5X/2X) Charge Pump Operation
  • Maximizes Efficiency and LED VF Coverage
  • 1MHz Constant Switching Frequency
  • No Inductors, Low Noise Operation
  • Drives Six Channels of LEDs up to 30mA/Channel
  • User-Programmable RSET Sets Maximum LED Current
  • Excellent LED Channel-to-Channel Current Match
  • Digitally Programmable LED Current with Single-Wire S²Cwire Interface
  • 16 Current Levels From ILED_MAX to 50µA
  • Low IQ (70µA) for Low Current Mode Operation
  • True Load Disconnect in Shutdown; IQ < 1µA
  • Built-In Thermal Protection
  • Built-In Auto-Disable for Open LED Circuit
  • Automatic Soft-Start Minimizes Inrush Startup Current
  • Small 3x4mm TDFN34-16 Package

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