LM2759SDX

• 1A output current
• Solution areas 2
• No inductance required
• 90% peak efficiency
• Adaptive 1X, 1.5X and 2X for maximum efficiency
• Load disconnect at shutdown
• Accurate input current control in gain conversion
• Flash time
• The TX input pin ensures synchronization with the RF power amplifier pulse
• Torch, Flash and indicator modes
• Enabled via external flash memory of the gating input pin
• Disable via my gating input 2 comet
• Programmable flash pulse width and flash current through my torch 2 C-compatible interface
• 1MHz constant frequency operation
• Low profile 12-pin LLP (3 × 3 ×0.8 mm)

illustrate

The LM2759 is an integrated low noise, high current regulated current source switched capacitor DC/DC converter. The device requires only four small ceramic capacitors and an overall solution area of more than 22 mm 2 The height is less than 1 mm. LM2759 is capable of driving loads from a single-cell lithium-ion battery to 1A. Based on the forward voltage and current requirements of the LED, the appropriate gain is actively selected to achieve the highest efficiency in the input voltage range.

The programmable LED current can be up to 1A through I 2 C-compatible interface, plus 8 selectable flash timeout durations. Drive high-current flash LEDs in high-power flash mode or low-power flare mode. The strobe pin allows the flash to switch the camera module's signal through a Flash. The TX input pin limits the flash LED current to an RF PA pulsed torch at current levels to reduce the high load on the battery. Internal soft-start circuitry limits the amount of inrush current during start-up.

The LM2759 is available in a small 12-pin thermally enhanced LLP package.

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• Camera flash for cellular phones