High Efficiency, Constant Current LED Driver With Adaptive Charge Pump And And TinyWire Single-Wire Control
The FAN5617 is a low-ripple, low-EMI, high-efficiency, constant-current LED Driver that drives three LEDs in parallel. The LED brightness control is programmable through Fairchilds proprietary single-wire digital Interface TinyWire. The Charge Pump DC/DC converter operates in three modes: 1X, 1.5X, and 2X over the entire input voltage range of 2.7V to 5.5V. The adaptive nature of the built-in Charge Pump eliminates the need for LED pre-selection (matching) and delivers high output efficiency. FAN5617 is capable of driving up to 90mA total output current, 30mA per channel. The drivers built-in, proprietary auto-sense circuit ensures the same efficiency regardless of the number of LEDs connected. When the input voltage is insufficient to sustain the LEDs programmable current level, the FAN5617 reconfigures itself to operate as a linear Regulator and the Charge Pump circuit turns off.
The FAN5617 features Fairchilds TinyWire singlewire digital Interface for LED brightness control. The built-in 5-bit DAC provides selection of 32 dimming levels, where each level is a percentage of the maximum LED current set by the external resistor, RSET.
The FAN5617 includes shutdown, short-circuit, and thermal protection circuitry. Minimal external components are required: two bucket capacitors (2F and 1F), a 4.7F input capacitor, and a 1F output capacitor are needed for proper operation.
The FAN5617 is available in a 3x3mm, 16-lead, molded leadless package (MLP).
By Fairchild Semiconductor
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