LM2791LD-L/NOPB National Semiconductor, LM2791LD-L/NOPB Datasheet
LM2791LD-L/NOPB
Specifications of LM2791LD-L/NOPB
LM2791LD-LTR
Available stocks
Related parts for LM2791LD-L/NOPB
LM2791LD-L/NOPB Summary of contents
Page 1
... The shut- down pin reduces the operating current to 1µA (max.). The LM2791 is available pin leadless leadframe (LLP) CSP package. Basic Application Circuit © 2002 National Semiconductor Corporation Features n Output matching of n Drives up to two LED’ 5.8V Input Voltage ...
Page 2
... Connection Diagram Ordering Information Order Number Shutdown Polarity LM2791LD-L Active Low LM2791LDX-L Active Low LM2791LD-H Active High LM2791LDX-H Active High www.national.com 20018303 Top View 10-Lead LLP NSC Package Package Drawing Marking LLP-10 SNB LLP-10 SNB LLP-10 SLB LLP-10 SLB 2 Supplied As 1000 Units, Tape and Reel ...
Page 3
Pin Description Pin Name 1 BRGT Variable voltage input controls output current Charge pump output. OUT 3 C1− Connect this pin to the negative terminal of C1. 4 C1+ Connect this pin to the positive terminal of C1. ...
Page 4
... Note 4: The output switches operate at one half of the oscillator frequency, f Note 5: The interanl thresholds of the shutdown bar are set at about 40 Note 6: This electrical specification is guaranteed by design. Note 7: For more inforamtion regarding the LLP package, please refer to National Semiconductor Application note AN1187 www.national.com (Note 1) ...
Page 5
Typical Performance Characteristics V = 3.6V, BRGT pin =0V 330Ω DIODE SET Supply Current at No Load SD-Threshold Diode Current vs. Temperature Unless otherwise specified Supply Current vs Supply Voltage 20018305 20018308 20018320 5 , ...
Page 6
Typical Performance Characteristics V = 3.6V, BRGT pin =0V, R DIODE SET I vs BRGT DIODE Switching Frequency vs Supply Voltage Start Up Time @ www.national.com Unless otherwise specified 330Ω (Continued) 20018313 Switching Frequency vs. Temperature ...
Page 7
Typical Performance Characteristics V = 3.6V, BRGT pin =0V 330Ω (Continued) DIODE SET Start Up Time @ 4.2 V Unless otherwise specified 20018316 1uF 3.6V, IN HOLD IN ...
Page 8
Circuit Description The LM2791 provides two matched current sources for driv- ing high forward voltage drop LEDs from Li-Ion battery sources. The device has on-chip current regulators which are composed of current mirrors with ratio. The ...
Page 9
Application Information turning-on its own parasitic diode and potentially latching-up result important to select a schottky diode that will carry at least 200mA or higher current to charge the output capacitor during start-up. A schottky diode ...
Page 10
... National highly recommends a 1:1 ratio between the pack- age and the PCB thermal land. To further enhance thermal conductivity, the PCB thermal land may include vias to a ground plane. For more detailed instructions on mounting LLP packages, please refer to National Semiconductor Ap- plication Note AN-1187 ...
Page 11
... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...