LM2611AMFX

LM2611 NSC | Alldatasheet

Document overview

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Technical content

Features

n 1.4MHz switching frequency n Low RDS(ON) DMOS FET n 1mVp-p output ripple n −5V at 300mA from 5V input n Better regulation than a charge pump n Uses tiny capacitors and inductors n Wide input range: 2.7V to 14V n Low shutdown current:<1uA n 5-lead SOT-23 package

Applications

n Positive to negative conversion Typical Application Circuit 20018117 January 2002 LM2611 1.4MHz Cuk Converter © 2002 National Semiconductor Corporation DS200181 www.national.com

Ordering Information

Order Number Package Type NSC Package Drawing Supplied As Package ID LM2611AMF SOT23-5 MF05A 1K Tape and Reel S40A LM2611AMFX 3K Tape and Reel S40A LM2611BMF 1K Tape and Reel S40B LM2611BMFX 3K Tape and Reel S40B Pin Description Pin Name Function 1 SW Drain of internal switch. Connect at the node of the input inductor and Cuk capacitor. 2 GND Analog and power ground. 3 NFB Negative feedback. Connect to output via external resistor divider to set output voltage.

4 SHDN

Shutdown control input. VIN = Device on. Ground = Device in shutdown. 5V IN Analog and power input. Filter out high frequency noise with a 0.1 µF ceramic capacitor placed close to the pin. Block Diagram 20018101 LM2611 www.national.com 2

Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V IN 14.5V SW Voltage −0. 4V to 36V NFB Voltage +0. 4V to −6V SHDN Voltage −0. 4V to 14.5V Maximum Junction Temperature 125˚C Power Dissipation (Note 2) Internally Limited Lead Temperature 300˚C ESD Susceptibility (Note 3) Human Body Model 2kV Machine Model 200V Operating Conditions Operating Junction Temperature Range (Note 4) −40˚C to +125˚C Storage Temperature −65˚C to +150˚C Supply Voltage 2.7V to 14V θ JA 256˚C/W

Electrical Characteristics

Specifications in standard type face are for TJ = 25˚C and those withboldface typeapply over the fullOperating Tempera- ture Range(T J = −40˚C to +85˚C) unless otherwise specified. VIN = 5.0V and IL = 0A, unless otherwise specified. Symbol Parameter Conditions Min (Note 4) Typ (Note 5) Max (Note 4) Units VIN Input Voltage 2.7 14 V ISW Switch Current Limit Grade A 1 1.2 2 A Grade B 0.7 0.9 R DSON Switch ON Resistance Grade A 0.5 0.65 ΩGrade B 0.7 0.9 SHDN TH Shutdown Threshold Device enabled 1.5 V Device disabled 0.50 ISHDN Shutdown Pin Bias Current VSHDN = 0V 0.0 µA VSHDN = 5V 0.0 1.0 NFB Negative Feedback Reference VIN =3 V −1.205 −1.23 −1.255 V INFB NFB Pin Bias Current V NFB =−1.23V −2.7 −4.7 −6.7 µA Iq Quiescent Current V SHDN = 5V, Switching 1.8 3.5 mA VSHDN = 5V, Not Switching 270 500 µA VSHDN = 0V 0.024 1 µA %V OUT / ΔVIN Reference Line Regulation 2.7V≤ VIN ≤ 14V 0.02 %/V fS Switching Frequency 1.0 1.4 1.8 MHz D MAX Maximum Duty Cycle 82 88 % IL Switch Leakage Not Switching VSW =5 V 1µ A Note 1:Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2:The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance,θJA, and the ambient temperature, TA. See the Electrical Characteristics table for the thermal resistance of various layouts. The maximum allowable power dissipation at any ambient temperature is calculated using: PD (MAX) = (TJ(MAX) −T A)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Note 3:The human body model is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor discharged directly into each pin. Note 4:All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100% tested or guaranteed through statistical analysis. All limits at temperature extremes are guaranteed via correlation using standard Statistical QualityControl (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). Note 5:Typical numbers are at 25˚C and represent the expected value of the parameter. LM2611 www.national.com3

Typical Performance Characteristics R DS(ON) vs VIN R DS(ON) Vs. Ambient Temperature VIN =5 V 20018112 20018145 Switch Current Limit vs. VIN Switch Current Limit vs Ambient Temperature VIN =5 V 20018111 20018143 Oscillator Frequency vs VIN Oscillator Frequency vs Ambient Temperature VIN =5 V 20018119 20018116 LM2611 www.national.com 4

Typical Performance Characteristics(Continued) VNFB vs VIN TA = 25˚C, VOUT = −5V VNFB vs Ambient Temperature VIN =5 V 20018107 20018124 INFB vs VIN TA = 25˚C, VOUT = −5V INFB vs Ambient Temperature VIN = 3.5V, VOUT = −5V 20018108 20018109 Iq vs Ambient Temperature (No Load) VSHUTDOWN vs Ambient Temperature VIN =5 V 20018144 20018110 LM2611 www.national.com5

Typical Performance Characteristics(Continued) Efficiency vs. Load VOUT = −5V, VIN =5 V Efficiency vs. VIN VOUT =− 5V, IOUT = 125mA 20018128 20018127 LM2611 www.national.com 6

cycle and high load currents. FIGURE 14. LM2611 High Current Schematic

Physical Dimensionsinches (millimeters) unless otherwise noted 5-lead SOT-23 Package LIFE SUPPORT POLICY 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 into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 www.national.com LM2611 1.4MHz Cuk Converter National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.