LM2759SDX/NOPB National Semiconductor, LM2759SDX/NOPB Datasheet
LM2759SDX/NOPB
Specifications of LM2759SDX/NOPB
Related parts for LM2759SDX/NOPB
LM2759SDX/NOPB Summary of contents
Page 1
... 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. Typical Application Circuit © 2010 National Semiconductor Corporation LM2759 Features ■ Output Current ■ Solution Area < ■ ...
Page 2
Connection Diagram Note 1: The actual physical placement of the package marking will vary from part to part. The package marking placeholder "XXXXX" code for the die traceability. "YYYYY" identifies the device (part number, voltage option, etc.). See ...
Page 3
... Maximum Lead Temp. (Soldering) ESD Rating(Note 6) Human Body Model ESD Caution Notice National Semiconductor recommends that all integrated circuits be handled with appropriate ESD precautions. Failure to observe proper ESD handling techniques can result in damage to the device. Electrical Characteristics Limits in standard typeface are for T J ≤ ...
Page 4
... Note 4: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at T 120°C (typ.). Note 5: For detailed soldering specifications and information, please refer to National Semiconductor Application Note AN-1187. Note 6: The Human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. (MIL-STD-883 3015.7) Note 7: In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may have to be derated ...
Page 5
Block Diagram 5 30069319 www.national.com ...
Page 6
Typical Performance Characteristics Unless otherwise specified 25° ceramic capacitors (MLCC's). Luxeon PWF3 Flash LED. Efficiency vs V Quiescent Current LED ISINK www.national.com = 3.6V 2.2µF, ...
Page 7
Oscillator Frequency 30069321 Flash Code Levels 30069332 Shutdown to Flash Mode, 1A 30069334 CH1: SDA; Scale: 2V/Div, DC Coupled CH2 Scale: 2V/Div, DC Coupled OUT CH3 Scale: 1A/Div, DC Coupled IN CH4: I ...
Page 8
Flash Timeout, Timeout Code (x03) = 325ms Torch Level (x0F) = 180mA, Flash Level (x05) = 410mA CH1(bottom Scale: 200mA/Div, DC Coupled IN CH2(middle): SDA; Scale: 2V/Div, DC Coupled CH3(top Scale: 2V/Div, DC Coupled OUT Time ...
Page 9
Application Information CIRCUIT DESCRIPTION The LM2759 is an adaptive CMOS charge pump with gains of 1x, 1.5x, and 2x, optimized for driving Flash LEDs in cam- era phones and other portable applications. It provides a constant current ...
Page 10
The acknowl- edge related clock pulse is generated by the master. The master releases the SDA line (HIGH) during the acknowledge clock pulse. The LM2759 pulls down the SDA line during ...
Page 11
SETTING LED CURRENT The current through the LED is set by programming the ap- propriate register with the desired current level code for Flash and Torch. The time that Flash mode is active is dependent on the lesser of the ...
Page 12
MFG Part No. 4.7 µF for C OUT C1608X5R0J475 Ceramic X5R JMK107BJ475 Ceramic X5R 2.2 µF for C1, C2 C1608X5R0J225 Ceramic X5R JMK107BJ225 Ceramic X5R POWER EFFICIENCY Efficiency of LED drivers is commonly taken to be the ratio ...
Page 13
Physical Dimensions inches (millimeters) unless otherwise noted 12–Pin LLP Package NS Package Number SDF12A 3.0mm X3 = 0.8mm 13 www.national.com ...
Page 14
... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...