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EMD2794-00HB16NRR fiches techniques PDF

Elite MicroPower - Regulated Switched Capacitor LED Current Source

Numéro de référence EMD2794-00HB16NRR
Description Regulated Switched Capacitor LED Current Source
Fabricant Elite MicroPower 
Logo Elite MicroPower 





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EMD2794-00HB16NRR fiche technique
Elite MicroPower Inc.
Preliminary EMD2794/EMD2795
Regulated Switched Capacitor LED Current
Source with Analog and PWM Brightness Control
General Description
The EMD2794/EMD2795 is a 1.5x/1.0x charge pump that
provides four regulated current sources. It accepts an
input voltage range from 2.7V to 5.5V and maintains a
constant current determined by an external resistor.
The EMD2794/EMD2795 delivers up to 80mA of load current
to accommodate four White LEDs. The switching
frequency is fixed at 1.2MHz to make noise filtering easier.
Brightness control can be done by both linear and PWM
techniques. Linear control is achieved by applying 0V to
3.0V to the BRGT pin to linearly vary the LED current. PWM
technique is to apply a clock to the EN pin to having
brightness varying with clock duty.
Shutdown is done by applying low (high for 2795) to the pin
EN. The VIN current drops to less than 1.0uA in shutdown
mode.
The EMD2794/EMD2795 is available in a TQFN-16 & FBP-16
3x3 package.
Features
„ Regulated current sources with ±0.5% matching
between any two outputs
„ High efficiency 3/2 boost function
„ Drives one to four white LEDs.
„ 2.7V to 5.5V input range
„ Up to 80mA output current
„ Analog brightness control
„ Active-low or high shutdown input (‘94/95)
„ Very small solution size and no inductor
„ Shutdown Current < 1μA
„ 1.2MHz switching frequency
„ Constant frequency generates predictable noise
spectrum
„ QFN16 3x3 package
Applications
„ White LED Display Backlights
„ White LED Keypad Backlights
„ 1-Cell Li-Ion battery-operated equipment including
PDAs, hand-held PCs, cellular phones.
Elite MicroPower Inc. reserves the right to make changes to improve reliability or manufacturability without notice, and
customers are advised to obtain the latest version of relevant information prior to placing orders.
DSD2794/2795_V2.1 January 21 th 2008
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