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LP3990 150mA Linear Voltage Regulator for Digital Applications
PRELIMINARY
May 2004
LP3990 150mA Linear Voltage Regulator for Digital Applications
General Description
The LP3990 regulator is designed to meet the requirements of portable, battery-powered systems providing an accurate output voltage, low noise, and low quiescent current. The LP3990 will provide a 0.8V output from the low input voltage of 2V at up to 150mA load current. When switched into shutdown mode via a logic signal at the enable pin, the power consumption is reduced to virtually zero. The LP3990 is designed to be stable with space saving ceramic capacitors as small as 0.47F. Performance is specified for a -40C to 125C junction temperature range. For output voltages other than 0.8V, 1.5V, 1.8V, 2.5V, 2.8V, or 3.3V please contact your local NSC sales office.
Key Specifications
n n n n n n n n n Input Voltage Range Output Voltage Range Output Current Output Stable - Capacitors Virtually Zero IQ (Disabled) Very Low IQ (Enabled) Low Output Noise PSRR Fast Start Up 2.0 to 6.0V 0.8 to 3.3V 150mA 0.47uF < 10nA 43uA 150uVRMS 64dB at 1kHz 105us
Package
4 Pin micro SMD 6 pin LLP (SOT23 footprint) SOT23 - 5
For other package options contact your NSC sales office.
1003m by 1283m
Features
n n n n n Accurate (3%) Output Voltage Stable with Ceramic Capacitor Logic Controlled Enable No Noise Bypass Capacitor Required Thermal-Overload and Short-Circuit Protection
Applications
n Cellular Handsets n Hand-Held Information Appliances
Typical Application Circuit
20076801
(c) 2004 National Semiconductor Corporation
DS200768
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LP3990
Pin Descriptions
Packages Pin No LLP 5 micro SMD A2 SOT23-5 3 VEN Enable Input; Enables the Regulator when 0.95V. Disables the Regulator when 0.4V. Enable Input has 1M pulldown resistor to GND. Common Ground. Connect to Pad. Voltage output. A 0.47F Low ESR Capacitor should be connected to this Pin. Connect this output to the load circuit. Voltage Supply Input. A 1.0F capacitor should be connected at this input. No Connection. Do not connect to any other pin. No Connection. Do not connect to any other pin. Common Ground. Connect to Pin 2. Symbol Name and Function
2 1 6 3 4 Pad
A1 B1 B2
2 5 1 4
GND VOUT VIN N/C N/C GND
Connection Diagrams
Micro SMD, 4 Bump Package
20076803
See NS package number TLA04 LLP-6 Package
20076806
See NS package number SDE06A
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LP3990
Connection Diagrams
(Continued) SOT23 - 5 Package (MF)
20076808
See NS package number MF05A
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LP3990
Ordering Information
For micro SMD Package * Please contact Sales Office for Availability Output Voltage (V) 0.8* 1.5* 1.8* 2.5 2.8* 3.3* Grade STD STD STD STD STD STD LP3990 Supplied as 250 Units, Tape and Reel LP3990TL-0.8 LP3990TL-1.5 LP3990TL-1.8 LP3990TL-2.5 LP3990TL-2.8 LP3990TL-3.3 For LLP-6 Package * Please contact Sales Office for Availability Output Voltage (V) 0.8* 1.5* 1.8* 2.5* 2.8* 3.3* Grade STD STD STD STD STD STD LP3990 Supplied as 1000 Units, Tape and Reel LP3990SD-0.8 LP3990SD-1.5 LP3990SD-1.8 LP3990SD-2.5 LP3990SD-2.8 LP3990SD-3.3 For SOT23 - 5 Package * Please contact Sales Office for Availability Output Voltage (V) 0.8* 1.5* 1.8* 2.5* 2.8* 3.3* Grade STD STD STD STD STD STD LP3990 Supplied as 1000 Units, Tape and Reel LP3990MF-0.8 LP3990MF-1.5 LP3990MF-1.8 LP3990MF-2.5 LP3990MF-2.8 LP3990MF-3.3 LP3990 Supplied as 3000 Units, Tape and Reel LP3990MFX-0.8 LP3990MFX-1.5 LP3990MFX-1.8 LP3990MFX-2.5 LP3990MFX-2.8 LP3990MFX-3.3 Package Marking SCCB SCEB SCFB SCJB SCKB SCLB LP3990 Supplied as 3000 Units, Tape and Reel LP3990SDX-0.8 LP3990SDX-1.5 LP3990SDX-1.8 LP3990SDX-2.5 LP3990SDX-2.8 LP3990SDX-3.3 Package Marking L085B L087B L088B L090B L091B L092B LP3990 Supplied as 3000 Units, Tape and Reel LP3990TLX-0.8 LP3990TLX-1.5 LP3990TLX-1.8 LP3990TLX-2.5 LP3990TLX-2.8 LP3990TLX-3.3 Package Marking
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LP3990
Absolute Maximum Ratings
(Notes 1, 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage Output Voltage Enable Input Voltage Junction Temperature Lead/Pad Temp. (Note 3) LLP/SOT23 micro SMD Storage Temperature Continuous Power Dissipation Internally Limited(Note 4) 235C 260C -65 to 150C -0.3 to 6.5V -0.3 to (VIN + 0.3V) to 6.5V (max) -0.3 to (VIN + 0.3V) to 6.5V (max) 150C
ESD (Note 5) Human Body Model Machine Model 2KV 200V
Operating Ratings(Note 1)
Input Voltage Shutdown Input Voltage Junction Temperature Ambient Temperature TARange (Note 6) 2V to 6V 0 to (VIN + 0.3V) to 6.0V (max) -40C to 125C -40C to 85C
Thermal Properties(Note 1)
Junction To Ambient Thermal Resistance(Note 8) JA(LLP-6) JA(microSMD) JASOT23-5 88C/W 220C/W 220C/W
Electrical Characteristics
Unless otherwise noted, VEN =950mV, VIN = VOUT + 1.0V, or 2.0V, whichever is higher. CIN = 1 F, IOUT = 1 mA, COUT =0.47 F. Typical values and limits appearing in normal type apply for TJ = 27C. Limits appearing in boldface type apply over the full junction temperature range for operation, -40 to +125C. (Note 13) Symbol VIN VOUT Parameter Input Voltage Output Voltage Tolerance Line Regulation Error Load Regulation Error (Note 14) Over full line and load regulation. VIN = (VOUT(NOM) + 1.0V) to 6.0V, IOUT = 1mA IOUT = 1mA to 150mA VOUT = 0.8 to 1.95V MicroSMD VOUT = 0.8 to 1.95V LLP, SOT-23 VOUT = 2.0 to 3.3V MicroSMD VOUT = 2.0 to 3.3V LLP, SOT-23 VDO ILOAD IQ Dropout Voltage Load Current Quiescent Current IOUT = 150mA (Note 7) (Notes 9, 10) VEN = 950mV, IOUT = 0mA VEN = 950mV, IOUT = 150mA VEN = 0.4V ISC IOUT PSRR EN Short Circuit Current Limit Maximum Output Current Power Supply Rejection Ratio Output noise Voltage (Note 10) f = 1kHz, IOUT = 1mA to 150mA f = 10kHz, IOUT = 150mA BW = 10Hz to 100kHz, Temperature Hysteresis VOUT = 0.8 VOUT = 1.5 VOUT = 3.3 TSHUTDOWN Thermal Shutdown 55 35 60 125 180 160 20 C VRMS (Note 11) 43 65 0.002 550 150 0.02 0.002 0.003 0.0005 0.002 120 0 80 120 0.2 1000 mA mA dB A Conditions Typ Limit Min 2 -3 -0.1 -0.005 -0.008 -0.002 -0.005 Max 6 +3 0.1 0.005 0.008 0.002 0.005 %/mA Units V % %/V
mV A
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LP3990
Electrical Characteristics
(Continued) Unless otherwise noted, VEN =950mV, VIN = VOUT + 1.0V, or 2.0V, whichever is higher. CIN = 1 F, IOUT = 1 mA, COUT =0.47 F. Typical values and limits appearing in normal type apply for TJ = 27C. Limits appearing in boldface type apply over the full junction temperature range for operation, -40 to +125C. (Note 13) Symbol Parameter Conditions Typ Limit Min Max 0.1 2.5 0.95 80 105 175 8 70 150 200 250 16 80 mV (pk - pk) mV s 10 0.4 Units
Enable Control Characteristics IEN (Note 12) VIL VIH TON Maximum Input Current at VEN Input Low Input Threshold High Input Threshold Turn On Time (Note 10) VEN = 0.0V VEN = 6V VIN = 2V to 6V VIN = 2V to 6V VOUT = 0.8 To 95% Level VIN(MIN) to 6.0V VOUT = 1.5 VOUT = 3.3 Transient Response Line Transient Response |VOUT| Trise = Tfall = 30s (Note 10) VIN = 600mV Load Transient Response |VOUT| Trise = Tfall = 1s (Note 10) IOUT = 1mA to 150mA 0.001 6 A V V
Timing Characteristics
Note 1: Absolute Maximum Ratings are limits beyond which damage can occur. Operating Ratings are conditions under which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: All Voltages are with respect to the potential at the GND pin. Note 3: For further information on these packages please refer to the following application notes;AN-1112 Micro SMD Package Wafer Level Chip Scale Package,AN-1187 Leadless Leadframe Package. Note 4: Internal thermal shutdown circuitry protects the device from permanent damage. Note 5: The human body model is 100pF discharged through a 1.5k resistor into each pin. The machine model is a 200pF capacitor discharged directly into each pin. Note 6: The maximum ambient temperature (TA(max)) is dependant on the maximum operating junction temperature (TJ(max-op) = 125C), the maximum power dissipation of the device in the application (PD(max)), and the junction to ambient thermal resistance of the part/package in the application (JA), as given by the following equation: TA(max) = TJ(max-op) - (JA x PD(max)). Note 7: Dropout voltage is voltage difference between input and output at which the output voltage drops to 100mV below its nominal value. This parameter only for output voltages above 2.0V. Note 8: Junction to ambient thermal resistance is dependant on the application and board layout. In applications where high maximum power dissipation is possible, special care must be paid to thermal dissipation issues in board design. Note 9: The device maintains the regulated output voltage without the load. Note 10: This electrical specification is guaranteed by design. Note 11: Short circuit current is measured with VOUT pulled to 0V and VIN worst case = 6.0V. Note 12: Enable Pin has 1M typical, resistor connected to GND. Note 13: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production at TJ = 25C or correlated using Statistical Quality Control methods. Operation over the temperature specification is guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control. Note 14: VIN(MIN) = VOUT(NOM) + 0.5V, or 2.0V, whichever is higher.
Output Capacitor, Recommended Specifications
Symbol COUT Parameter Output Capacitor Conditions Capacitance(Note 15) ESR Typ 0.47 Limit Min 0.329 5 500 Max Units F m
Note 15: The capacitor tolerance should be 30% or better over temperature. The full operating conditions for the application should be considered when selecting a suitable capacitor to ensure that the minimum value of capacitance is always met. Recommended capacitor type is X7R. However, dependent on application, X5R, Y5V, and Z5U can also be used. (See capacitor section in Applications Hints)
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LP3990
Typical Performance Characteristics. Unless otherwise specified, CIN = 1.0F Ceramic, COUT = 0.47 F Ceramic, VIN = VOUT(NOM) + 1.0V, TA = 25C, VOUT(NOM) = 1.5V , Shutdown pin is tied to VIN.
Output Voltage Change vs Temperature Ground Current vs Load Current
20076810
20076831
Ground Current vs VIN. ILOAD = 0mA
Ground Current vs VIN. ILOAD = 1mA
20076812
20076813
Ground Current vs VIN. ILOAD = 150mA
Short Circuit Current
20076815
20076814
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LP3990
Typical Performance Characteristics. Unless otherwise specified, CIN = 1.0F Ceramic, COUT = 0.47 F Ceramic, VIN = VOUT(NOM) + 1.0V, TA = 25C, VOUT(NOM) = 1.5V , Shutdown pin is tied to VIN. (Continued)
Short Circuit Current Line transient
20076816
20076817
Power Supply Rejection Ratio
Power Supply Rejection Ratio
20076819
20076820
Enable Start-up Time
Enable Start-up Time
20076821
20076822
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LP3990
Typical Performance Characteristics. Unless otherwise specified, CIN = 1.0F Ceramic, COUT = 0.47 F Ceramic, VIN = VOUT(NOM) + 1.0V, TA = 25C, VOUT(NOM) = 1.5V , Shutdown pin is tied to VIN. (Continued)
Load Transient Noise Density
20076825
20076828
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LP3990
Application Hints
EXTERNAL CAPACITORS In common with most regulators, the LP3990 requires external capacitors for regulator stability. The LP3990 is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance. INPUT CAPACITOR An input capacitor is required for stability. It is recommended that a 1.0F capacitor be connected between the LP3990 input pin and ground (this capacitance value may be increased without limit). This capacitor must be located a distance of not more than 1cm from the input pin and returned to a clean analogue ground. Any good quality ceramic, tantalum, or film capacitor may be used at the input. Important: Tantalum capacitors can suffer catastrophic failures due to surge current when connected to a lowimpedance source of power (like a battery or a very large capacitor). If a tantalum capacitor is used at the input, it must be guaranteed by the manufacturer to have a surge current rating sufficient for the application. There are no requirements for the ESR (Equivalent Series Resistance) on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will remain ) 1.0F over the entire operating temperature range. OUTPUT CAPACITOR The LP3990 is designed specifically to work with very small ceramic output capacitors. A 0.47F ceramic capacitor (dielectric types Z5U, Y5V or X7R) with ESR between 5m to 500m, is suitable in the LP3990 application circuit. For this device the output capacitor should be connected between the VOUT pin and ground. It is also be possible to use tantalum or film capacitors at the device output, COUT (or VOUT), but these are not as attractive for reasons of size and cost (see the section Capacitor Characteristics). The output capacitor must meet the requirement for the minimum value of capacitance and also have an ESR value that is within the range 5m to 500m for stability. NO-LOAD STABILITY The LP3990 will remain stable and in regulation with no external load. This is an important consideration in some circuits, for example CMOS RAM keep-alive applications. CAPACITOR CHARACTERISTICS The LP3990 is designed to work with ceramic capacitors on the output to take advantage of the benefits they offer. For capacitance values in the range of 0.47F to 4.7F, ceramic capacitors are the smallest, least expensive and have the lowest ESR values, thus making them best for eliminating high frequency noise. The ESR of a typical 1F ceramic capacitor is in the range of 20m to 40m, which easily meets the ESR requirement for stability for the LP3990. Capacitor selection should take account of all capacitor parameters to ensure that its specification is met, within the
applications operating range. Capacitor values can be reduced under DC bias, as well as temperature, and frequency of operation. Note that the smaller case sizes, e.g. 0402, are generally worse in this respect. Capacitor values will also show some decrease over time, due to aging. The temperature performance of ceramic capacitors varies by type. Most large value ceramic capacitors ( 2.2F) are manufactured with Z5U or Y5V temperature characteristics, which results in the capacitance dropping by more than 50% as the temperature goes from 25C to 85C. A better choice for temperature coefficient in a ceramic capacitor is X7R. This type of capacitor is the most stable and holds the capacitance within 15% over the temperature range. Tantalum capacitors are less desirable than ceramic for use as output capacitors because they are more expensive when comparing equivalent capacitance and voltage ratings in the 0.47F to 4.7F range. Another important consideration is that tantalum capacitors have higher ESR values than equivalent size ceramics. This means that while it may be possible to find a tantalum capacitor with an ESR value within the stable range, it would have to be larger in capacitance (which means bigger and more costly) than a ceramic capacitor with the same ESR value. It should also be noted that the ESR of a typical tantalum will increase about 2:1 as the temperature goes from 25C down to -40C, so some guard band must be allowed. ENABLE CONTROL The LP3990 features an active high Enable pin, VEN, which turns the device on when pulled high. When not enabled the regulator output is off and the device typically consumes 2nA. If the application does not require the Enable switching feature, the VEN pin should be tied to VIN to keep the regulator output permanently on. To ensure proper operation, the signal source used to drive the VEN input must be able to swing above and below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under VIL and VIH. Micro SMD MOUNTING The micro SMD package requires specific mounting techniques, which are detailed in National Semiconductor Application Note AN-1112. For best results during assembly, alignment ordinals on the PC board may be used to facilitate placement of the micro SMD device. Micro SMD LIGHT SENSITIVITY Exposing the micro SMD device to direct light may affect the operation of the device. Light sources, such as halogen lamps, can affect electrical performance, if placed in close proximity to the device. Light with wavelengths in the infra-red portion of the spectrum is the most detrimental, and so, fluorescent lighting used inside most buildings, has little or no effect on performance.
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LP3990
Physical Dimensions
inches (millimeters) unless otherwise noted
micro SMD, 4 Bump, Package (TLA04) NS Package Number TLA04ALA The dimensions for X1, X2 and X3 are given as: X1 = 1.003 +/- 0.03mm X2 = 1.283 +/- 0.03mm X3 = 0.600 +/- 0.075mm
LLP, 6 Lead, Package (SOT23 Land) NS Package Number SDE06A
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LP3990 150mA Linear Voltage Regulator for Digital Applications
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
SOT23 - 5 Package NS Package Number MF05A
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. BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ``Banned Substances'' as defined in CSP-9-111S2.
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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.

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