* Question
What are the main features of the NCP5009?
* Answer
Boost LED backlight driver, current-loop regulation for uniform brightness; inductor-based, high-efficiency converter.
Input 2.7–6.0 V, output compliance up to 15 V (VL2). Suits 1–4 white LEDs (or 2×2) from a Li-ion supply.
Ultra-low standby current: typ. 3 µA @ 3.6 V (10 µA @ 6 V); operating current typ. 600 µA.
Current capability: pulsed regulation to 400 mA, continuous DC load to 75 mA (with external reservoir cap for continuous mode).
Automatic LED current matching with no external sense resistor; output current set by Iref resistor (internal scale factor k = 746).
Dimming/control modes:
LOCAL (pin low): constant current defined by Iref; CS/CLK ignored.
REMOTE (LOCAL high/open): serial CS/CLK steps program the LED current (on-chip shift register).
Ambient-light feedback (NCP5009 only): PHOTO pin sinks current from an external phototransistor to reduce LED current as ambient light increases (1:1 ratio to Iref, limited to ~65 µA).
Logic robustness: inputs have Schmitt triggers (~0.3·Vbat / 0.7·Vbat thresholds) for noise immunity.
Switching frequency: typ. 300 kHz internal boost oscillator.
Protection/ESD: all pins ESD-protected (±2 kV HBM, ±200 V MM).
Package / ordering: Micro-10 (MSOP/TSSOP width, “DM” suffix); tape-and-reel options (e.g., NCP5009DMR2).
These specs come from the ON Semiconductor NCP5008/5009 datasheet and cover the key behaviors that matter for selection and design-in.
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