LP3986 LP3986 Dual Micropower 150 mA Ultra Low-Dropout CMOS Voltage Regulators in micro SMD Package Literature Number: SNVS142T LP3986 Dual Micropower 150 mA Ultra Low-Dropout CMOS Voltage Regulators in micro SMD Package General Description Features The LP3986 is a 150 mA dual low dropout regulator designed for portable and wireless applications with demanding performance and board space requirements. The LP3986 is stable with a small 1 F 30% ceramic output capacitor requiring smallest possible board space. The LP3986's performance is optimized for battery powered systems to deliver ultra low noise, extremely low dropout voltage and low quiescent current independent of load current. Regulator ground current increases very slightly in dropout, further prolonging the battery life. Optional external bypass capacitor reduces the output noise further without slowing down the load transient response. Fast start-up time is achieved by utilizing a speed-up circuit that actively precharges the bypass capacitor. Power supply rejection is better than 60 dB at low frequencies and 55 dB at 10 kHz. High power supply rejection is maintained at low input voltage levels common to battery operated circuits. The LP3986 is available in a micro SMD package. Performance is specified for a -40C to +125C temperature range. For single LDO applications, please refer to the LP3985 datasheet. Miniature 8-I/O micro SMD package Stable with 1F ceramic and high quality tantalum output capacitors Fast turn-on Two independent regulators Logic controlled enable Over current and thermal protection Key Specifications Guaranteed 150 mA output current per regulator 1nA typical quiescent current when both regulators in shutdown mode 60 mV typical dropout voltage at 150 mA output current 115 A typical ground current 40 V typical output noise 200 s fast turn-on circuit -40C to +125C junction temperature Applications CDMA cellular handsets GSM cellular handsets Portable information appliances Portable battery applications Typical Application Circuit 20003401 (c) 2007 National Semiconductor Corporation 200034 www.national.com LP3986 Dual Micropower 150 mA Ultra Low-Dropout CMOS Voltage Regulators in micro SMD Package February 2007 LP3986 Block Diagram LP3986 20003402 Pin Descriptions Name *micro SMD VOUT2 A1 Output Voltage of the second LDO Function EN2 B1 Enable input for the second LDO BYPASS C1 Bypass capacitor for the bandgap GND C2 Common ground GND C3 Common ground EN1 B3 Enable input for the first LDO VOUT1 A3 Output Voltage of the first LDO VIN A2 Common input for both LDOs * Note: The pin numbering scheme for the micro SMD package was revised in April 2002 to conform to JEDEC standard. Only the pin numbers were revised. No changes to the physical location of the inputs/outputs were made. For reference purposes, the obsolete numbering scheme had VOUT2 as pin 1, EN2 as pin 2, BYPASS as pin 3, GND as pins 4 and 5, EN1 as pin 6, VOUT1 as pin 7, and VIN as pin 8. Connection Diagram 20003404 Top View 8 Bump micro SMD Package See NS Package Number TLA08 www.national.com 2 LP3986 Ordering Information For micro SMD Package (TL has thickness of 0.600mm) Output Voltage (V) Grade Package Marking LP3986 Supplied as 250 Units, Tape and Reel LP3986 Supplied as 3000 Units, Tape and Reel 2.5 2.5 STD 27 LP3986TL-2525 LP3986TLX-2525 2.5 2.8 STD 14 LP3986TL-2528 LP3986TLX-2528 2.5 1.8 STD 30 LP3986TL-2518 LP3986TLX-2518 2.6 2.6 STD 28 LP3986TL-2626 LP3986TLX-2626 2.8 1.8 STD 25 LP3986TL-2818 LP3986TLX-2818 2.8 2.8 STD 10 LP3986TL-2828 LP3986TLX-2828 2.85 2.85 STD 11 LP3986TL-285285 LP3986TLX285285 2.9 2.9 STD 15 LP3986TL-2929 LP3986TLX-2929 3.0 2.8 STD 26 LP3986TL-3028 LP3986TLX-3028 3.0 3.0 STD 12 LP3986TL-3030 LP3986TLX-3030 3.1 3.1 STD 13 LP3986TL-3131 LP3986TLX-3131 3.1 3.3 STD 16 LP3986TL-3133 LP3986TLX-3133 3.3 3.3 STD 17 LP3986TL-3333 LP3986TLX-3333 20003403 3 www.national.com LP3986 Maximum Power Dissipation (Note 4) ESD Rating (Note 5) Human Body Model Machine Model 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. VIN, VEN VOUT 364mW 2kV 200V -0.3 to 6.5V Operating Ratings -0.3 to (VIN+0.3V) 6.5V 150C -65C to +150C 235C Junction Temperature Storage Temperature Pad Temp. (Note 3) (Notes 1, 2) VIN VEN 2.7 to 6V 0 to (VIN+ 0.3V) 6V -40C to +125C Junction Temperature Thermal Resistance JA Maximum Power Dissipation (Note 6) 220C/W 250mW Electrical Characteristics Unless otherwise specified: VIN = VOUT(nom) + 0.5V, CIN = 1 F, IOUT = 1mA, COUT = 1 F, CBYPASS = 0.01F. Typical values and limits appearing in standard typeface are for TJ = 25C. Limits appearing in boldface type apply over the entire junction temperature range for operation, -40C to +125C. (Notes 7, 8) Symbol VOUT Parameter Conditions Output Voltage Tolerance IOUT = 1mA Line Regulation Error (Note 9) VIN = (VOUT(nom) + 0.5V) to 6.0V, IOUT = 1 mA Load Regulation Error (Note IOUT = 1mA to 150 mA 10) Output AC Line Regulation PSRR Power Supply Rejection Ratio IQ Quiescent Current Typ Max -2.5 -3.0 2.5 3.0 % of VOUT (nom) 0.092 0.128 %/V 0.003 0.006 0.01 %/mA 1.5 VIN = 3.1V, f = 1 kHz, IOUT = 50 mA (Figure 2) 60 VIN = 3.1V, f = 10 kHz, IOUT = 50 mA (Figure 2) 50 Both Regulators ON VEN = 1.4V, IOUT = 0 mA 115 200 Both Regulators ON VEN = 1.4V, IOUT = 0 to 150 mA 220 320 One Regulator ON VEN = 1.4V IOUT = 0 mA 75 130 One Regulator ON VEN = 1.4V IOUT = 0 to 150 mA 130 200 0.001 2 4 2 100 Dropout Voltage (Note 11) IOUT = 1 mA IOUT = 150 mA 0.4 60 ISC Short Circuit Current Limit Output Grounded 600 IOUT(PK) Peak Output Current(Note 15) VOUT VOUT(nom) - 5% 500 TON Turn-On Time (Note 12) CBYPASS = 0.01 F 200 en Output Noise Voltage BW = 10 Hz to 100 kHz, COUT = 1F 40 4 Units 0.006 VIN = VOUT(nom) + 1V, IOUT = 150 mA (Figure 1) VEN = 0.4V, Both Regulators OFF (shutdown) www.national.com Limit Min mVP-P dB A mV mA 300 mA s Vrms Parameter Conditions n(1/f) Output Noise Density IEN Maximum Input Current at EN VEN = 0.4 and VIN = 6V VIL Maximum Low Level Input Voltage at EN VIN = 2.7 to 6V VIH Minimum High Level Input Voltage at EN VIN = 2.7 to 6V f = 120 Hz, COUT = 1F Typ Limit Min Max 1 Units V/ 10 nA 0.4 V V 1.4 ILoad1 = 150 mA at 1KHz rate ILoad2 = 1 mA Xtalk Crosstalk Rejection VOUT2/VOUT1 -60 dB ILoad2 = 150 mA at 1KHz rate ILoad1 = 1 mA VOUT2/VOUT1 -60 All VOUT > = 2.5V, CIN Input capacitance(Note 13) If VOUT = 1.8V, VIN_MIN>= 2.9V COUT Capacitance(Note 13) All VOUT > = 2.5V, 1 If VOUT = 1.8V, VIN_MIN>= 2.9V ESR F 4.7 (Note 14) F 1 22 F 2.2 22 F 5 500 m Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may 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: Additional information on pad temperature can be found in National Semiconductor Application Note (AN-1112). Note 4: The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formula: PD = (TJ - TA)/JA, Where TJ is the junction temperature, TA is the ambient temperature, and JA is the junction-to-ambient thermal resistance. The 364mW rating appearing under Absolute Maximum Ratings results from substituting the Absolute Maximum junction temperature, 150C, for TJ, 70C for TA, and 220C/W for JA. More power can be dissipated safely at ambient temperatures below 70C . Less power can be dissipated safely at ambient temperatures above 70C. The Absolute Maximum power dissipation can be increased by 4.5mW for each degree below 70C, and it must be derated by 4.5mW for each degree above 70C. 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: Like the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The 250mW rating appearing under Operating Ratings results from substituting the maximum junction temperature for operation, 125C, for TJ, 70C for TA, and 220C/W for JA into (1) above. More power can be dissipated at ambient temperatures below 70C . Less power can be dissipated at ambient temperatures above 70C. The maximum power dissipation for operation can be increased by 4.5mW for each degree below 70C, and it must be derated by 4.5mW for each degree above 70 C. Note 7: All limits are guaranteed. All electrical characteristics having room temperature limits are tested during production with TJ = 25C or correlated using Statistical Quality Control (SQC) methods. All hot and cold limits are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control. Note 8: The target output voltage, which is labeled VOUT(nom), is the desired voltage option. Note 9: The output voltage changes slightly with line voltage. An increase in the line voltage results in a slight increase in the output voltage and vice versa. Note 10: The output voltage changes slightly with load current. An increase in the load current results in a slight decrease in the output voltage and vice versa. Tested limit applies to Vout 's of 2.5V and greater. Note 11: Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value. Note 12: Turn-on time is that between the enable input just exceeding VIH and the output voltage just reaching 95% of its nominal value. Note 13: Range of capacitor values for which the device will remain stable. This electrical specification is guaranteed by design. Note 14: Range of capacitor ESR values for which the device will remain stable. This electrical specification is guaranteed by design. Note 15: IPEAK guaranteed for Vout 's of 2.5V and greater. 5 www.national.com LP3986 Symbol LP3986 Test Signals 20003408 FIGURE 1. Line Regulation Input Test Signal 20003409 FIGURE 2. PSRR Input Test Signal Typical Performance Characteristics Unless otherwise specified, CIN= COUT 1F Ceramic, C BP= 0.01 F, VIN = VOUT + 0.5, TA= 25C, both enable pins are tied to VIN Power Supply Rejection Ratio (CBP = 0.001F) Power Supply Rejection Ratio (CBP = 0.01F) 20003410 www.national.com 20003447 6 LP3986 Power Supply Rejection Ratio (CBP = 0.1F) Output Noise Spectral Density 20003451 20003448 Line Transient Response (CBP = 0.001F) Line Transient Response (CBP = 0.01F) 20003413 20003449 Load Transient & Cross Talk (VIN = VOUT + 0.2V) Load Transient & Cross Talk (VIN = VOUT + 0.2V) 20003417 20003416 7 www.national.com LP3986 Start-Up Time (CBP = 0.001, 0.01, 0.1F) Enable Response ( VIN = 4.2V ) 20003411 20003414 Enable Response (VIN = VOUT+ 0.2V) Enable Response 20003450 20003415 Output Short Circuit Current at VIN = 6V Output Short Circuit Current at VIN = 3.3V 20003465 www.national.com 20003466 8 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 1F 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. EXTERNAL CAPACITORS Like any low-dropout regulator, the LP3986 requires external capacitors for regulator stability. The LP3986 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 capacitance of 1F is required between the LP3986 input pin and ground (the amount of the capacitance 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 analog 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 on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be 1F over the entire operating temperature range. NOISE BYPASS CAPACITOR Connecting a 0.01F capacitor between the CBYPASS pin and ground significantly reduces noise on the regulator output. This cap is connected directly to a high impedance node in the band gap reference circuit. Any significant loading on this node will cause a change on the regulated output voltage. For this reason, DC leakage current through this pin must be kept as low as possible for best output voltage accuracy. The use of this 0.01F bypass capacitor is strongly recommended to prevent overshoot on the output during start up. The types of capacitors best suited for the noise bypass capacitor are ceramic and film. High-quality ceramic capacitors with either NPO or COG dielectric typically have very low leakage. Polypropolene and polycarbonate film capacitors are available in small surface-mount packages and typically have extremely low leakage current. Unlike many other LDO's, addition of a noise reduction capacitor does not effect the transient response of the device. OUTPUT CAPACITOR The LP3986 is designed specifically to work with very small ceramic output capacitors, any ceramic capacitor (temperature characteristics X7R, X5R, Z5U or Y5V) in 1 to 22 F range with 5m to 500m ESR range is suitable in the LP3986 application circuit. It may also be possible to use tantalum or film capacitors at the output, but these are not as attractive for reasons of size and cost (see next section Capacitor Characteristics). The output capacitor must meet the requirement for minimum amount of capacitance and also have an ESR (Equivalent Series Resistance) value which is within a stable range. ON/OFF INPUT OPERATION The LP3986 is turned off by pulling the VEN pin low, and turned on by pulling it high. If this feature is not used, the VEN pin should be tied to VIN to keep the regulator output on at all times. To assure 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. NO-LOAD STABILITY The LP3986 will remain stable and in regulation with no-load (other than the internal voltage divider). This is specially important in CMOS RAM keep-alive applications. FAST ON-TIME The LP3986 outputs are turned on after Vref voltage reaches its final value (1.23V nominal). To speed up this process, the noise reduction capacitor at the bypass pin is charged with an internal 70A current source. The current source is turned off when the bandgap voltage reaches approximately 95% of its final value. The turn on time is determined by the time constant of the bypass capccitor. The smaller the capacitor value, the shorter the turn on time, but less noise gets reduced. As a result, turn on time and noise reduction need to be taken into design consideration when choosing the value of the bypass capacitor. CAPACITOR CHARACTERISTICS The LP3986 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 1F to 4.7F range, ceramic capacitors are the smallest, least expensive and have the lowest ESR values (which makes them best for eliminating high frequency noise). The ESR of a typical 1F ceramic capacitor is in the range of 20 m to 40 m, which easily meets the ESR requirement for stability by the LP3986. The ceramic capacitor's capacitance can vary with temperature. The capacitor type X7R, which operates over a temperature range of -55C to +125C, will only vary the capacitance to within 15%. Most large value ceramic capacitors ( 2.2F) are manufactured with Z5U or Y5V temperature characteristics. Their capacitance can drop by more than 50% as the temperature goes from 25C to 85C. Therefore, X7R is recommended over Z5U and Y5 in applications where the ambient temperature will change significantly above or below 25 C. MICRO SMD MOUNTING The micro SMD package requires specific mounting techniques which are detailed in National Semiconductor Application Note (AN-1112). Referring to the section Surface Mount Technology (SMT) Assembly Considerations. For best results during assembly, alignment ordinals on the PC board may be used to facilitate placement of the micro SMD device. 9 www.national.com LP3986 Application Hints LP3986 inside most buildings has very little effect on performance. A micro SMD test board was brought to within 1cm of a fluorescent desk lamp and the effect on the regulated output voltage was negligible, showing a deviation of less than 0.1% from nominal. MICRO SMD LIGHT SENSITIVITY Exposing the micro SMD device to direct sunlight will cause misoperation of the device. Light sources such as halogen lamps can effect electrical performance if brought near to the device. The wavelengths which have most detrimental effect are reds and infra-reds, which means that the fluorescent lighting used www.national.com 10 LP3986 Physical Dimensions inches (millimeters) unless otherwise noted micro SMD, 8 Bump NS Package Number TL08CCA The dimensions for X1, X2 and X3 are as follows: X1 = 1.55mm X2 = 1.55mm X3 = 0.600mm 11 www.national.com LP3986 Dual Micropower 150 mA Ultra Low-Dropout CMOS Voltage Regulators in micro SMD Package Notes THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION ("NATIONAL") PRODUCTS. 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