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ZLED7022ZI1R Datasheet(PDF) 1 Page - Integrated Device Technology |
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ZLED7022ZI1R Datasheet(HTML) 1 Page - Integrated Device Technology |
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1 / 14 page  Low-Voltage Six-Channel LED Driver ZLED7022 Datasheet © 2016 Integrated Device Technology, Inc. 1 April 20, 2016 Cin Cout . 1 2 n<=14 1 μF VCC EN/SET GND C+ C- Vout D0 D1 D2 D3 D4 D5 2.8V to 5.5V 2.2 μF 2.2 μF ZLED7022 Cpump Brief Description The ZLED7022, one of our ZLED family of LED control ICs, is a low-noise, constant-frequency charge pump DC/DC converter that can drive up to six LED channels, providing a programmable constant current level ranging from 1.8mA to 20mA per LED channel. It can also drive higher current LEDs because its current sinks can operate in parallel. It enables white or other color LED applications that require uniform intensity and/or linear progressions in brightness. Capable of operating effi- ciently with DC voltage supplies ranging from 2.8V to 5.5V, it is ideal for small, battery-powered applications because very few external components are needed: typically one small-dimension 1μF capacitor across the C+ and C- pins and two small-dimension 2.2μF capaci- tors to GND from the VCC and Vout pins. The ZLED7022’s Pulse Count Control (PCC) serial digi- tal input is used to enable/disable the LEDs and set the current level (14 settings using a nearly logarithmic scale to provide a linear brightness progression). This simple, high-speed interface allows efficient real-time management of LEDs via microcontrollers or control systems. The ZLED7022’s features include integrated soft-start circuitry to protect against excessive in-rush current dur- ing power-on and a low-current shutdown mode that reduces quiescent current consumption to approximately 1 μA (typical) by disconnecting the load from the input when the EN/SET pin is low for a specified time. Features • Low quiescent current in low-current shutdown mode: 1μA typical; <2μA maximum • Integrated thermal shutdown protection prevents damage by shutting down the ZLED7022 if the die junction temperature exceeds 160°C (typical) • Fixed charge pump switching frequency: 1MHz (typ.) • Soft-start feature protects against excessive inrush current during power-on Benefits • Current matching accuracy: ±0.9% (typical) • One-pin on/off or brightness control for up to six LEDs via a simple PCC serial interface—no pulse- width modulation or additional control circuit needed • 14 programmable current levels for achieving real- time control of effects such as LED fade-out or sudden changes in brightness • Low EMI and back-injected noise because the charge pump is not inductor-based • Very few external components needed for operation • Flexible design enables diverse LED applications: up to 20mA per channel • LED driver family concept with low-voltage four-channel LED driver ZLED7012 Available Support • Evaluation Kit Physical Characteristics • Voltage supply: 2.8V to 5.5V DC • Operating temperature: -40°C to 85°C • Small footprint 12-pin UTQFN package (2mm×2mm) ZLED7022 Application Circuit |
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