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PDF LM2759 Data sheet ( Hoja de datos )
| Número de pieza | LM2759 | |
| Descripción | 1A Switched Capacitor Flash LED Driver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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November 20, 2008
LM2759 PRODUCT BRIEF
1A Switched Capacitor Flash LED Driver with I2C
Compatiblewww.datasheet4u.com Interface
General Description
LM2759 is an integrated low-noise, high-current switched ca-
pacitor DC/DC converter with a regulated current source. The
device requires only four small ceramic capacitors making the
total solution area less than 22 mm2 and the height less than
1 mm. The LM2759 is capable of driving loads up to 1A from
a single-cell Li-Ion battery. Maximum efficiency is achieved
over the input voltage range by actively selecting the proper
gain based on the LED forward voltage and current require-
ments.
The LED current can be programmed up to 1A via an I2C-
compatible interface, along with eight selectable Flash Time-
Out durations. One high-current Flash LED can be driven
either in a high-power Flash mode or a low-power Torch
mode. The Strobe pin allows the flash to be toggled via a
Flash enable signal from a camera module. The TX input pin
limits the Flash LED current to the Torch current level during
a RF PA pulse, to reduce high loads on the battery. Internal
soft-start circuitry limits the amount of inrush current during
start-up.
LM2759 is offered in a small 12-pin thermally enhanced LLP
package.
Notice: This document is not a full datasheet. For more
information regarding this product or to order samples,
please contact your National Semiconductor sales office
or visit http://www.national.com/support/dir.html.
Features
■ Up to 1A Output Current
■ Solution Area < 22 mm2
■ No Inductor Required
■ 90% Peak Efficiency
■ Adaptive 1x, 1.5x and 2x Gains for Maximum Efficiency
■ Load Disconnect in Shutdown
■ Accurate Input Current Control During Gain Transitions
■ Flash Time-Out
■ TX Input Pin Ensures Synchronization with RF Power
Amplifier Pulse
■ Torch, Flash, and Indicator Modes
■ External Flash Enable via Strobe Input Pin
■ Strobe Input Disable via I2C
■ Programmable Flash Pulse Duration, and Torch and Flash
Currents via I2C-Compatible Interface
■ 1MHz Constant Frequency Operation
■ Low Profile 12–Pin LLP (3mm x 3mm x 0.8mm)
Applications
■ Camera Flash in Cellular Phones
Typical Application Circuit
© 2008 National Semiconductor Corporation 300693
30069301
www.national.com
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