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PDF ET9378 Data sheet ( Hoja de datos )
| Número de pieza | ET9378 | |
| Descripción | Constant frequency 1x/1.33x charge pump DC/DC converter | |
| Fabricantes | Etek Microelectronics | |
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General Description
The ET9378 is a low noise, constant frequency 1x/1.33x charge pump DC/DC converter for white LED applications. The
ET9378 is capable of driving up to eight channels of LEDs at preset 19mA per channel from a 3.3V to 5.5V input. Under
the same conditions, when the charge pump is opened, its efficiency is 10% higher than the conventional 1.5X charge
pump. The current sinks may be operated individually parallel for driving higher current LEDs. Only two 1μF flying
capacitors and two small 1μF capacitors (at Vcc and Vout) make this part ideally suited for small, batterypowered
applications.
The serial digital input is used to enable, disable, and set current for each LED with 16 settings down to 1.2mA. Each
output of the ET9378 is equipped with builtin softstart circuitry prevents excessive inrush current during startup. A low
current shutdown feature disconnects the load from the input and reduces quiescent current to less than 1μA.
The ET9378 is available in a Pbfree, spacesaving 3.0×3.0mm 20pin QFN20 package.
Features
VIN Range: 2.5V to 5.5V
Fully Programmable Current with Single Wire——16 Current Levels
Drives up to Eight Channels of LEDs
Overcurrent and Overtemperature Protected
No Inductors, Low Noise Operation
Small Application Circuit
Automatic Soft Start
I Q <1μA in Shutdown
Undervoltage Lockout with Hysteresis
Package：3.0×3.0mm QFN20(ET9378Y)
Applications
Cell Phone/Smart Phone/PDA
Mp3/Mp4/PMP
White LED Backlighting
Pin Configuration
1 page | ||
| Páginas | Total 1 Páginas | |
| PDF Descargar | [ Datasheet ET9378.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ET9378 | Constant frequency 1x/1.33x charge pump DC/DC converter | Etek Microelectronics |
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