lm2758tlx National Semiconductor Corporation, lm2758tlx Datasheet
lm2758tlx
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lm2758tlx Summary of contents
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... Flash mode. Internal soft-start circuitry limits the amount of inrush current during start-up. LM2758 is offered in National’s tiny 12-bump thin micro SMD package. Typical Application Circuit © 2008 National Semiconductor Corporation Features ■ 700 mA Output Current ■ ...
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... EN2 A3 I SET D3 PGND Ordering Information Order Number LM2758TL LM2758TLX www.national.com 12-Bump Thin Micro SMD 1.514mm x 1.996mm x 0.6mm NS Package Number TLA12 Description Supply voltage connection. Charge pump regulated output. A 2.2 µF ceramic capacitor is required from CP GND. Connect flash LED anode to this pin. ...
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Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications pins: Voltage to GND IN OUT EN1, EN2 pins: Voltage to GND Continuous Power Dissipation (Note ...
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Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and ...
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Block Diagram 5 30045319 www.national.com ...
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Typical Performance Characteristics Unless otherwise specified 25°C, V ceramic capacitors (MLCC's). Luxeon PWF1 Flash LED. Efficiency vs V Quiescent Current LED LED- www.national.com = 3.6V, CIN = COUT = 2.2 µ ...
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Shutdown to Flash Mode V = 3.6V 500 mA IN LED Shutdown to Indicator Mode V = 3.6V, I (Torch) = 108 mA, EN2 = 0V IN LED Torch to Flash Mode Transition EN2 = V = 3.6V, ...
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Application Information CIRCUIT DESCRIPTION The LM2758 is an adaptive 1x and 1.5x CMOS charge pump, optimized for driving Flash LEDs in camera phone and other portable applications. It provides a constant current 500 mA (typ.) for Flash ...
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ANALOG BRIGHTNESS CONTROL The current though the LED could be varied dynamically by changing the I current. The above figure shows the circuit. SET The current though the LED can be calculated as follows. CAPACITOR SELECTION The LM2758 requires 4 ...
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POWER EFFICIENCY Efficiency of LED drivers is commonly taken to be the ratio of power consumed by the LEDs (P LED the input of the part (P ). With a 1x/1.5x charge pump, the IN input current is equal to ...
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Physical Dimensions inches (millimeters) unless otherwise noted 12–bump micro SMD NS Package Number TLA12 X1 = 1.514 mm ± 30 µ 1.996 mm ± 30 µ 0.600 mm ± 75 µm 11 www.national.com ...
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