LM828 NSC | Alldatasheet

Document overview

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Technical content

Features

n Inverts Input Supply Voltage n SOT-23-5 Package n 20Ω Typical Output Impedance n 97% Typical Conversion Efficiency at 5 mA

Applications

n Operational Amplifier Power Supplies n Interface Power Supplies n Handheld Instruments Basic Application Circuits Voltage Inverter DS100137-1 +5V to −10V Converter DS100137-2 March 1999 LM828 Switched Capacitor Voltage Converter © 1999 National Semiconductor Corporation DS100137 www.national.com

Absolute Maximum Ratings(Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (V+ to GND, or GND to OUT) 5.8V V+ and OUT Continuous Output Current 50 mA Output Short-Circuit Duration to GND (Note 2) 1 sec. Continuous Power Dissipation (T A = 25˚C)(Note 3) 240 mW TJMax (Note 3) 150˚C θJA (Note 3) 300˚C/W Operating Junction Temperature Range −40˚C to 85˚C Storage Temperature Range −65˚C to +150˚C Lead Temp. (Soldering, 10 seconds) 300˚C ESD Rating (Note 7) 2kV

Electrical Characteristics

Limits in standard typeface are for TJ = 25˚C, and limits inboldfacetype apply over the full operating temperature range. Un- less otherwise specified: V+= 5V, C1 = C 2 = 10 µF. (Note 4) Symbol Parameter Condition Min Typ Max Units V+ Supply Voltage R L =10kΩ 1.8 5.5 V IQ Supply Current No Load 40 75 µA 115 R OUT Output Resistance (Note 5) I L = 5m A 2 0 65 Ω fOSC Oscillator Frequency (Note 6) Internal 12 24 56 kHz fSW Switching Frequency (Note 6) Measured at CAP+ 6 12 28 kHz PEFF Power Efficiency I L = 5m A 9 7 % VOEFF Voltage Conversion Efficiency No Load 95 99.96 % Note 1:Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2:OUT may be shorted to GND for one second without damage. However, shorting OUT to V+ may damage the device and should be avoided. Also, for tem- peratures above 85˚C, OUT must not be shorted to GND or V+, or the device may be damaged. Note 3:The maximum allowable power dissipation is calculated by using PDMax = (TJMax −T A)/θJA, where TJMax is the maximum junction temperature, TA is the ambient temperature, andθJA is the junction-to-ambient thermal resistance of the package. Note 4:In the test circuit, capacitors C1 and C2 are 10 µF, 0.3Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output voltage and efficiency. Note 5:Specified output resistance includes internal switch resistance and capacitor ESR. See the details in the application information. Note 6:The output switches operate at one half of the oscillator frequency, fOSC = 2fSW . Note 7:The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. www.national.com 2

*C 1 and C2 are 10 µF capacitors. FIGURE 1. LM828 Test Circuit

Typical Performance Characteristics(Circuit of Figure 1, V+= 5V unless otherwise specified) (Continued) Connection Diagram

Ordering Information

Package Marking Supplied as LM828M5 MA05B S08A (Note 8) Tape and Reel (250 units/rail) LM828M5X MA05B S08A (Note 8) Tape and Reel (3000 units/rail) Note 8:The first letter″S″ identifies the part as a switched capacitor converter. The next two numbers are the device number. Larger quantity reels are available upon request. Output Voltage vs Load Current DS100137-33 Efficiency vs Load Current DS100137-34 Switching Frequency vs Supply Voltage DS100137-35 Switching Frequency vs Temperature DS100137-36 5-Lead Small Outline Package (M5) DS100137-13 Top View With Package Marking DS100137-14 Actual Size www.national.com 4

Physical Dimensionsinches (millimeters) unless otherwise noted LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or sys- tems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose fail- ure 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 rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 5-Lead Small Outline Package (M5) For Order Numbers, refer to the table in the″Ordering Information″ section of this document. LM828 Switched Capacitor Voltage 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.