View NSC05142_994125.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LP2980LV Micropower SOT, 50 mA Low-Voltage Low-Dropout Regulator For Applications With Output Voltages < 2V
May 1999
LP2980LV Micropower SOT, 50 mA Low-Voltage Low-Dropout Regulator For Applications With Output Voltages < 2V
General Description
The LP2980LV is a 50 mA, fixed-output voltage regulator designed for high performance in applications requiring output voltages below 2V. Using an optimized VIPTM (Vertically Integrated PNP) process, the LP2980LV delivers unequalled performance in all specifications critical to battery-powered designs: Low Ground Pin Current. Typically 280 A @ 50 mA load, and 75 A @ 1 mA load. Sleep Mode. Less than 1 A quiescent current when ON/ OFF pin is pulled low. Smallest Possible Size. SOT-23 package uses absolute minimum board space. Precision Output. 0.5% tolerance output voltages available (A grade).
Features
n n n n n n n n n n n n Guaranteed 50 mA output current Smallest possible size (SOT-23 Package) Requires few external components < 1 A quiescent current when shutdown Low ground pin current at all load currents Output voltage accuracy 0.5% (A Grade) High peak current capability (150 mA typical) Wide supply voltage range (16V max) Fast dynamic response to line and load Low ZOUT 0.1 typical (10 Hz to 1 MHz) Overtemperature/overcurrent protection -40C to +125C junction temperature range
Applications
n n n n Cellular Phone Palmtop/Laptop Computer Personal Digital Assistant (PDA) Camcorder, Personal Stereo, Camera
Block Diagram
DS101091-1
VIPTM is a trademark of National Semiconductor Corporation.
(c) 1999 National Semiconductor Corporation
DS101091
www.national.com
Connection Diagram
5-lead Small Outline Package (M5)
DS101091-2
Top View For Ordering Information See Table 1 See NS Package Number MA05B
Ordering Information
TABLE 1. Package Marking and Ordering Information Output Voltage (V) 1.5V 1.5V 1.5V 1.5V 1.8V 1.8V 1.8V 1.8V Grade A A STD STD A A STD STD Order Information LP2980AIM5X-1.5 LP2980AIM5-1.5 LP2980IM5X-1.5 LP2980IM5-1.5 LP2980AIM5X-1.8 LP2980AIM5-1.8 LP2980IM5X-1.8 LP2980IM5-1.8 Package Marking LANA LANA LANB LANB LAGA LAGA LAGB LAGB Supplied as: 3k Units on Tape and Reel 250 Units on Tape and Reel 3k Units on Tape and Reel 250 Units on Tape and Reel 3k Units on Tape and Reel 250 Units on Tape and Reel 3k Units on Tape and Reel 250 Units on Tape and Reel
Basic Application Circuit
DS101091-3
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. Storage Temperature Range Operating Junction Temperature Range Lead Temperature (Soldering, 5 sec.) -65C to +150C -40C to +125C 260C
ESD Rating (Note 2) Power Dissipation (Note 3) Input Supply Voltage (Survival) Input Supply Voltage (Operating) ON/OFF Input Voltage (Survival) Output Voltage (Survival), (Note 4) IOUT (Survival) Input-Output Voltage (Survival), (Note 5)
2 kV Internally Limited -0.3V to +16V 2.1V to +16V -0.3V to +16V -0.3V to +9V Short Circuit Protected -0.3V to +16V
Electrical Characteristics
Limits in standard typeface are for TJ = 25C, and limits in boldface type apply over the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, CIN = 1 F, COUT = 4.7 F, VON/OFF = 2V. Symbol Parameter Conditions Typ LP2980LVAI-XX (Note 6) Min VO Output Voltage Tolerance Output Voltage Line Regulation IL = 1 mA 1 mA < IL < 50 mA VO(NOM) + 1V VIN 16V IL = 0 IL = 1 mA IGND Ground Pin Current IL = 10 mA IL = 50 mA VON/OFF < 0.18V IL = 50 mA -0.50 -0.75 -2.50 0.007 65 75 120 280 0 2.05 High = O/P ON Low = O/P OFF VON/OFF VON/OFF IO(PK) en Peak Output Current Output Noise Voltage (RMS) Ripple Rejection =0 = 5V 1.4 0.55 0 5 150 125 63 IO(MAX) Short Circuit Current RL = 0 (Steady State) (Note 8) 150 100 1.6 0.18 -1 15 100 Max 0.50 0.75 2.50 0.014 0.032 85 110 95 160 175 325 475 850 1 2.20 1.6 0.18 -1 15 LP2980LVI-XX (Note 6) Min -1.00 -1.50 -3.50 Max 1.00 1.50 -3.50 0.014 0.032 85 110 95 160 175 325 475 850 1 2.20 V A %VNOM Units
%/V
VIN(min)
Minimum input voltage required to maintain output regulation ON/OFF Input Voltage (Note 7) ON/OFF Input Current
VON/OFF ION/OFF
V A mA V dB mA
VOUT VO(NOM) - 5% BW = 300 Hz to 50 kHz, COUT = 10 F f = 1kHz COUT = 10 F
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside of its rated operating conditions. Note 2: The ESD rating of pins 3 and 4 is 1 kV. Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, JA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
The value of JA for the SOT-23 package is 220C/W. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2980LV output must be diode-clamped to ground.
3
www.national.com
Electrical Characteristics
(Continued)
Note 5: The output PNP structure contains a diode between the VIN and VOUT terminals that is normally reverse-biased. Reversing the polarity from VIN to VOUT will turn on this diode and possibly damage the device (see Application Hints). Note 6: Limits are 100% production tested at 25C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate National's Average Outgoing Quality Level (AOQL). Note 7: The ON/OFF input must be properly driven to prevent misoperation. For details, refer to Application Hints. Note 8: See Typical Performance Characteristics curves.
Typical Performance Characteristics Unless otherwise specified: TA = 25C, COUT = 4.7 F, CIN = 1F, ON/OFF pin tied to VIN, VIN = VO(NOM) + 1V, VOUT(NOM) = 1.8V.
VOUT vs Temperature Output Characteristics
DS101091-7 DS101091-5
Min Input Voltage vs Temperature
Ground Pin Current vs Temperature
DS101091-8
DS101091-22
www.national.com
4
Typical Performance Characteristics Unless otherwise specified: TA = 25C, COUT = 4.7 F, CIN = 1F, ON/OFF pin tied to VIN, VIN = VO(NOM) + 1V, VOUT(NOM) = 1.8V. (Continued)
Ground Pin Current vs Load Current Input Current vs VIN
DS101091-9 DS101091-23
Input Current vs VIN
Input Current vs VIN
DS101091-10
DS101091-11
Line Transient
Line Transient
DS101091-24
DS101091-25
5
www.national.com
Typical Performance Characteristics Unless otherwise specified: TA = 25C, COUT = 4.7 F, CIN = 1F, ON/OFF pin tied to VIN, VIN = VO(NOM) + 1V, VOUT(NOM) = 1.8V. (Continued)
Load Transient Response Load Transient Response
DS101091-14
DS101091-15
Short Circuit Current
Instantaneous Short Circuit Current vs Temperature
DS101091-26 DS101091-27
Short Circuit Current
Instantaneous Short Circuit Current vs Output Voltage
DS101091-28 DS101091-29
www.national.com
6
Typical Performance Characteristics Unless otherwise specified: TA = 25C, COUT = 4.7 F, CIN = 1F, ON/OFF pin tied to VIN, VIN = VO(NOM) + 1V, VOUT(NOM) = 1.8V. (Continued)
Output Impedance vs Frequency Output Noise Density
DS101091-6
DS101091-13
Ripple Rejection
Input to Output Leakage vs Temperature
DS101091-12 DS101091-30
Output Reverse Leakage vs Temperature
Turn-On Waveform
DS101091-16
DS101091-31
7
www.national.com
Typical Performance Characteristics Unless otherwise specified: TA = 25C, COUT = 4.7 F, CIN = 1F, ON/OFF pin tied to VIN, VIN = VO(NOM) + 1V, VOUT(NOM) = 1.8V. (Continued)
Turn-Off Waveform ON/OFF Pin current vs VON/OFF
DS101091-17 DS101091-32
Application Hints
INPUT CAPACITOR An input capacitor whose capacitance is 1 F is required between the LP2980 input pin and ground (the amount of capacitance may be increased without limit). The input capacitor must be located a distance of not more than 1 cm away from the input pin and returned to a clean analog ground. Any good quality ceramic, Tantalum, or film capacitor may be used at the input. IMPORTANT: Tantalum capacitors may suffer catastrophic failure due to surge current when connected to a low-impedance source of power (like a battery or very large capacitor). If a Tantalum input capacitor is used, it must be guaranteed by the manufacturer to have a surge current rating sufficient for the application. There are no requirements for ESR on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be 1 F over the entire operating range. OUTPUT CAPACITOR The LP2980 requires an output capacitor to maintain loop stability. The capacitor must be selected to meet the requirements of capacitance and ESR (equivalent series resistance) over the full operating temperature range of the application (see SELECTING THE OUTPUT CAPACITOR). The minimum amount of capacitance which can be used on the output is 2.2 F, but this value may be increased without limit. Four curves are provided which show the stable ESR range of the LP2980-1.8V operated with output capacitances of 2.2, 4.7, 10, and 15 F:
DS101091-18
2.2 F ESR Curves For 1.8V Output
DS101091-19
4.7 F ESR Curves For 1.8V Output
www.national.com
8
Application Hints
(Continued)
It should also be noted that the ESR typically increases about 2X - 3X when going from +125C down to -40C. Another factor to consider is that Tantalum manufacturers are presently designing their products toward the goal of getting the lowest possible ESR, in an attempt to compete with the new high-value ceramic capacitors. This means that the typical values will probably continue to decline in the future. SELECTING THE OUTPUT CAPACITOR This section contains guidelines for selecting an output capacitor which will maintain good regulator stability over the entire operating temperature range (refer to ESR CURVES). 2.2 F OUTPUT CAPACITOR The smallest output capacitor which can be used with the LP2980-1.8 is 2.2 F. However, care must be exercised if this value is used because of the ESR requirement.
DS101091-20
10 F ESR Curves For 1.8V Output
At load currents 25mA, the stable ESR range is approximately 0.5 to 6. This range is probably sufficiently wide that most 2.2 F Tantalum capacitors would fall within it. At higher values of load currents (using a 2.2 F output capacitor), the stable ESR window gets very narrow. It is likely that a Tantalum capacitor would not be a good choice for a design that must be robust enough for mass production. Instead, a 2.2 F capacitor with very low ESR (either ceramic or film) should be used with a 2 external resistor placed in series to provide the ESR. 4.7 F OUTPUT CAPACITOR If a 4.7 F capacitor is used, the stable range of ESR values for 50 mA operation is approximately 0.6 to 6. Because of the reduced ESR values of the new Tantalum, it is possible to find 4.7 F Tantalum capacitors with ESR values at or below 0.6. To ensure a stable design, it is recommended that an external resistor (value about 0.5) be added in series with the 4.7 F Tantalum to provide adequate minimum ESR. At values of load current 20 mA, the ESR range is wide enough that Tantalum can be used without external resistance for added ESR. Another acceptable configuration for 50 mA operation is to use a ceramic or film 4.7 F capacitor (which has very low ESR) with an external 2 resistor in series. 10 F OUTPUT CAPACITOR 50 mA operation using a 10 F output capacitor requires an ESR in the range of approximately 0.4 to 7. As stated previously, it is possible that solid Tantalum capacitors can be found with ESR values near to or below 0.4. An external resistor in series with the Tantalum (value of about 0.5) is recommended to assure unconditional stability. At values of load current 20 mA, the ESR range is wide enough that Tantalum can be used without external resistance for added ESR. Another acceptable configuration for 50 mA operation is to use a ceramic or film 10 F capacitor (which has very low ESR) with an external 2 resistor in series. 15 F OUTPUT CAPACITOR The stable ESR range (for 50 mA load current) using a 15 F output capacitor is approximately 0.1 to 10. It is extremely unlikely that a 15 F Tantalum capacitor would be found with an ESR below 0.1, so no external resistance is required with a Tantalum.
DS101091-21
15 F ESR Curves For 1.8V Output It should be noted that for the lower values of the output capacitance ( < 10 F), it may be necessary to use a capacitor and series resistance to provide sufficient ESR. To understand why this is true, the basic characteristics of capacitance types must be explained: CAPACITOR CHARACTERISTICS: Ceramic Capacitors have an extremely low ESR (in the range of 5-15 m), and can only be used on the output of the LP2980 if an external resistor is placed in series to supply the needed ESR (a resistance value of about 2 +/- 30% is recommended). Be careful of the temperature coefficient of ceramics: select X7R or X5R if possible, because those types typically vary less than +/- 25% over the range of -40 to +125C. Z5U types are worse, and will typically lose half (or more) of their capacitance over the same temperature range. A source for large-value ceramics with good performance is Taiyo-Yuden. Their web address is : http://www.t-yuden.com/hicap.html Tantalum capacitors have ESR values that are more difficult to determine: the manufacturers specify only a maximum limit, which is typically 10X or 20X the typical value. ESR values can vary considerably from lot to lot and from manufacturer to manufacturer. For example, some 4.7 F/10V devices tested showed typical values in the range of 0.5 - 1, but values as high as 6 have been seen.
9
www.national.com
Application Hints
(Continued)
As before, another acceptable configuration for 50 mA operation is to use a ceramic or film 15 F capacitor with an external 2 resistor in series. ON/OFF INPUT OPERATION The LP2980 is shut off by pulling the ON/OFF input low, and turned on by pulling it high. If this feature is not to be used, this pin should be tied to VIN to keep the regulator on at all times. To ensure proper operation, the signal source used to drive the ON/OFF input must be able to swing above and below the specified turn-on/turn-off voltage thresholds (see Electrical Characteristics). It is also important that the turn-on (and turn-off) voltage signals applied to the ON/OFF input have a slew rate which is not less than 40 mV/s. CAUTION: The regulator output state can not be guaranteed if a slow-moving AC (or DC) signal is applied that it is in the range between the turn-on/turn-off voltage thresholds specified in the Electrical Characteristics section.
REVERSE INPUT/OUTPUT VOLTAGE The PNP power transistor used as the pass element in the LP2980 has an inherent diode connected between the regulator output and input. During normal operation (where the input voltage is higher than the output) this diode is reverse-biased. However, if the output is pulled above the input, this diode will turn ON and current will flow into the regulator output. In such cases, a parasitic SCR can latch which will allow a high current to flow into VIN (and out the ground pin), which can damage the part. In any application where the output may be pulled above the input, an external Schottky diode must be connected from VIN to VOUT (cathode on VIN, anode on VOUT), to limit the reverse voltage across the LP2980 to 0.3V (see Basic Application Circuit).
www.national.com
10
LP2980LV Micropower SOT, 50 mA Low-Voltage Low-Dropout Regulator For Applications With Output Voltages < 2V
Physical Dimensions
inches (millimeters) unless otherwise noted
5-Lead Small Outline Package (M5) NS Package Number MA05B For Order Numbers, refer to Table 1 in the "Order Information" section of this document.
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.
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 Francais Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80
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 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
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.

▲Up To Search▲

Price & Availability of NSC05142

	To Download NSC05142 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .