LX8211-30ISE

LX8211 INTEGRATED PRODUCTS 150mA CMOS Low Dropout Regulator P RODUCTION D ATA S HEET DESCRIPTION KEY FEATURES W W W. Microsemi . COM The LX8211 fixed/adjustable voltage linear regulators combines low dropout, high accuracy, ultra-low ground current and fast response in a very small footprint. Using the Enable pin the regulators is switched on with TTL logic levels, which is especially useful for batteryoperated equipment. Other features include independent Thermal and Short Circuit Current protection. The regulator is stable with a low value ceramic output capacitors. For ultra low noise operation a Bypass pin is brought out to connect an optional capacitor. Significant performance improvements over Bipolar technology are achieved designing in CMOS: increased regulator efficiency by minimizing operating ground current (typVOUT+VDROPOUT. * Size your output capacitor to meet the transient loading requirement. If you have a very dynamic load, a lower ESR and larger value capacitor will improve the response to these load steps. ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature -40°C ≤ TA ≤ 125°C except where otherwise noted. Test conditions: VIN = VOUT + 0.5V; IOUT =10mA; CIN = 1uF; COUT = 1uF; TJ=TA using low duty cycle pulse testing methods. Parameter Symbol TJ = 25°C IOUT = 0mA to 150mA, VIN = VOUT + .5V to 6V TJ = 25°C IOUT = 0mA to 150mA, VIN = 2.85V to 6V VIN: VOUT + 0.5 TO 6 VOLTS, IOUT=0.1mA TJ = 25°C, IOUT: 0.5 TO 150mA IOUT: 0.5 TO 150mA ILOAD = 1mA, ∆VO = -1% Dropout Voltage (VIN − VO ) (Note2) VDO ILOAD = 50mA, ∆VO = -1% ILOAD = 100mA, ∆VO = -1% ILOAD = 150mA, ∆VO = -1% Ground Pin Current Adjust Input Bias Current Enable Pin Current Enable Threshold Short Circuit Current Limit Power Supply Rejection Ratio Output Noise Thermal Shutdown Temperature IGND ISTBY IADJ IEN VIH VIL IOUTSC PSRR Test Conditions Min -1 -2.5 LX8211-XX Typ Max 1 2.5 1.175 0.04 0.5 1.187 1.20 0.15 1.0 1.5 0.05 0.1 0.175 0.25 140 0.175 0.3 0.4 220 1 100 100 2.0 0.4 Units %VNOM %VNOM V %/V %VNOM %VNOM V V V V µA µA nA nA V V mA dB µV °C Output Voltage (-25, -27, -28, -30, -33) Adjust Reference Voltage (-00) Line Regulation  VO VADJ VRV VRI 1.163 1.14  ∆VO  ∆VIN     ∆VO  ∆I O    Load Regulation  Enable = Hi Enable = Low VADJ = 1.175V VEN = VIN ELECTRICALS ELECTRICALS VOUT = 0V TJ = 25°C, f = 120Hz TJ = 25°C, COUT = 10uF,CBYPASS = 470 pF 400 50 50 170 eN TSD Note 2: Dropout voltage is defined as the input to output differential at which the output voltage drops 1% below the nominal value. Copyright  2000 Rev. 1.0b, 2002-07-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX8211 INTEGRATED PRODUCTS 150mA CMOS Low Dropout Regulator P RODUCTION D ATA S HEET BLOCK DIAGRAM W W W. Microsemi . COM VIN Thermal Shutdown RA VOUT Current Limit ENABLE Control Logic + RB VREF CBY/ADJUST GND Figure 2 – Simplified Fixed Version Block Diagram (LX8211-25 / 27 / 28/ 30/ 33ISE) VIN Thermal Shutdown VOUT Current Limit + ENABLE Control Logic CBY/ADJUST - BLOCK DIAGRAM BLOCK DIAGRAM VREF GND Figure 3 – Simplified Adjustable Version Block Diagram (LX8211-00ISE) Copyright  2000 Rev. 1.0b, 2002-07-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX8211 INTEGRATED PRODUCTS 150mA CMOS Low Dropout Regulator P RODUCTION D ATA S HEET APPLICATION INFORMATION W W W. Microsemi . COM Description The LX8211 is a family of LDO (Low Drop-Out) linear regulators in a small SOT-23 Package, which provides a compact and cost effective solution. The family includes several fixed output voltages, along with an adjustable version. The internal PMOS power device provides low dropout regulation with fast line and load transient response. It also includes internal current limit and thermal shutdown circuitry. In this section you will find information about selection of external capacitors, thermal and layout consideration. Minimum Load Requirement The LX8211 is stable even at zero load; no minimum load is required for operation, which is especially important in keep-alive applications. However line regulation is improved with a minimum load of 100uA. Temperature Protection The thermal protection shuts the LX8211 down when the junction temperature exceeds approximately 1500C, there is no appreciable thermal hysteresis. Input Capacitor To improve load transient response and noise rejection a bypass capacitor is recommended, but it is not required for stability. There are no requirements for the ESR (Equivalent Series Resistor) on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitor will be around 1uF over the entire operating temperature range. For LX8211 connect ceramic type capacitor (1uF) between VIN and ground. Short Circuit Current Protection The LX8211 includes over current protection, when the output load current exceeds typically 400mA the circuit forces the regulator decrease in output. Thermal Consideration Thermal shutdown protects the integrated circuit from thermal overload caused from a rise in junction temperature during power dissipation. This means of protection is intended for fault protection only and not as a means of current or power limiting during normal application usage. Proper thermal evaluation should be done to ensure that the junction temperature dose not exceed it’s maximum rating. Operating at the maximum TJ of 150°C can impact reliability . Due to variation in individual device electrical characteristics and thermal resistance , the built in thermal overload protection may be activated at power levels slightly above or below the rated dissipation. Power dissipation for regulator can be calculated using the following equation: Output Capacitor To maintain a constant output voltage a feedback loop is necessary. The feedback loop causes a well known a phase shift, the amount of phase shift determines the loop stability. Therefore, LX8211 like any low-dropout regulator, requires an output capacitor with low ESR (Equivalent Series Resistor) connected between VOUT and GND to stabilize the internal control loop. For the LX8211 a ceramic, tantalum or electrolytic capacitor with the minimum recommended capacitance value at 1.0 uF with ESR between 5mΩ and 1Ω will satisfy the stability for whole operating range. Bypass Capacitor (Optional) / Adjustable Output Voltage The LX8211 includes the extra Bypass pin to help further reduce the already low output noise in the regulator. If the output noise requirement meets the specification, omit the bypass capacitor, that’s because the capacitor impacts the start up time which is inversely proportional to the size of bypass capacitor. The bypass capacitor reduces the regulator phase margin, therefore it requires a larger output capacitor to maintain stability. The LX8211-00 adjustable regulator’s output voltage can be externally set by connecting the ADJ pin to an external resistor divider (See Figure 1). The output voltage can be calculated using: R1   VOUT = VADJ 1 +   R2 PD = (VIN(MAX)-VOUT(MIN)) * IOUT(MAX) (Note: power dissipation resulting from quiescent current is negligible) For the SOT23 package, thermal resistance, θJA is 2200C/W when mounted on a FR4 copper clad PCB. Junction temperature of the integrated circuit can be calculated using: TJ = TA + TRISE, substituting: TA + (PD * θJA). An example: Given conditions: TA = 60°C, VIN= 4.2V, VOUT= 2.7V, IOUT= 100mA. Calculated values: Total Power dissipation PD(total) = (4.2-2.7) V * 0.1A =0.15W Junction Temperature TJ = 60°C +(0.15W *220°C/W) = 93°C APPLICATION APPLICATION Layout Consideration: The layout must be done with low impedance paths for VIN, VOUT and Ground by applying sufficient wide traces to avoid voltage drops and pick up noise. Adding an area of PCB copper to the GND pin (pin2) will reduce the overall θJA since it is thermally connected to the device substrate. This will lower the device junction temperature improving the overall output accuracy. The input/output capacitors must be placed as close as possible to the voltage regulator output pin. To allow the same voltage reference for all circuits, use a star configuration from the output capacitor to the different loads. Enable The Enable pin allows the LX8211 to be turned on and off. The Enable pin is compatible with standard TTL-CMOS levels. A logic zero (0.4V) on the Enable pin shuts the LX8211 off and reduces the supply current to less than 1uA. Pulling the Enable input high (2.0V) causes normal operation to resume. If the Enable feature is not used, this pin can be connected to VIN. Copyright  2000 Rev. 1.0b, 2002-07-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 LX8211 INTEGRATED PRODUCTS 150mA CMOS Low Dropout Regulator P RODUCTION D ATA S HEET TYPICAL CHARACTERISTICS Typical performance characteristics, unless otherwise specified are: CIN = COUT = 1µF, CBY = 470pF, VIN = VOUT = 2.5V, TA = 25°C, ENABLE is tied to VIN. VADJ VOLTAGE vs TEMPERATURE 1.185 W W W. Microsemi . COM OUTPUT VOLTAGE vs TEMPERATURE 2.525 2.52 1.18 OUTPUT VOLTAGE (V) 2.515 2.51 2.505 2.5 2.495 2.49 2.485 2.48 OUTPUT VOLTAGE (V) 1.175 1.17 1.165 1.16 1.155 -50 -25 0 25 50 TEMPERATURE (°C) 75 100 125 2.475 -50 -25 0 25 50 TEMPERATURE (°C) 75 100 125 D R O P O UT V O LT A G E v s T E M P E R A T UR E 350 325 300 275 250 225 200 175 150 125 100 75 50 -50 - 25 0 25 50 75 100 125 S H O R T C IR C UIT C UR R E N T v s T E M P E R A T UR E v s S UP P LY V O LT A G E -340 -350 -360 IL =150mA -370 -380 -390 -400 V IN =5V V IN =4V V IN =3V - 50 -25 0 25 50 75 100 125 IL =100mA - 410 -420 -430 TEMPERATURE (°C) TEMPERATURE ( °C) G R O UN D C UR R EN T v s S UP P LY V O LT A G E 0 POWER SUPPLY / RIPPLE REJECTION vs FREQUENCY DROPUT REGION 0dB -50 - 100 -40 PSSR - 150 25 85 50dB C CHARTS -200 115 -250 2.8 3.3 3.8 4.3 4.8 5.3 5.8 6.3 100dB 0.1 SUPPLY VOLTAGE ( V) Frequency (kHz) 100 Copyright  2000 Rev. 1.0b, 2002-07-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 LX8211 INTEGRATED PRODUCTS 150mA CMOS Low Dropout Regulator P RODUCTION D ATA S HEET TYPICAL CHARACTERISTICS (CONTINUED) POWER SUPPLY RIPPLE REJECTION VS. FREQUENCY 0dB CBYPASS = 470pF W W W. Microsemi . COM POWER SUPPLY / RIPPLE REJECTION VS. FREQUENCY 0dB CBYPASS = 0 PSSR 50dB PSSR Frequency (kHz) 50dB 100dB 0.1 100 100dB 0.1 Frequency (kHz) 100 ENABLE RESPONSE VIN = 3.3V CIN = 1µF, COUT = 22µF, CBVP = 470pF, IOUT = 100mA VOUT = 2.5V 1V / DIV LOAD TRANSIENT RESPONSE `VIN = 3.3V, CIN = 1µF, COUT = 2.2µF, STEP Load = 50mA VIN 50mV / DIV 50mV / DIV VOUT = 2.5V VENABLE 5V / DIV 50mA / DIV ISTEP = 50mA 100µs / DIV 20µs / DIV LINE REGULATION STEP RESPONSE CIN = 1µF, COUT = 22µF, CBVP = 470pF, IOUT = 100mA LOAD TRANSIENT RESPONSE VIN = 3.3V, CIN = 1µF, COUT = 2.2µF, STEP Load = 100mA 10mV / DIV VOUT = 2.5V 50mV / DIV VOUT = 2.5V CHARTS CHARTS VIN 3.75V 2.75V 100m A/ DIV ISTEP = 100mA 20µs / DIV 20µs / DIV Copyright  2000 Rev. 1.0b, 2002-07-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 LX8211 INTEGRATED PRODUCTS 150mA CMOS Low Dropout Regulator P RODUCTION D ATA S HEET PACKAGE DIMENSION W W W. Microsemi . COM SE 5 Pin Plastic SOT-23 Dim A A1 B C D E F G H I J K Note: 1. Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006”) on any side. Lead dimension shall not include solder coverage. D G H E A1 A C MILLIMETERS MIN MAX 0.90 1.30 0.90 1.45 0.25 0.50 0.09 0.20 2.80 3.10 1.50 1.75 0.95 BSC 1.90 BSC 2.60 3.00 0.35 0.55 0.00 0.15 10° MAX INCHES MIN MAX 0.035 0.051 0.035 0.057 0.010 0.020 0.004 0.008 0.110 0.122 0.059 0.069 0.038 BSC 0.075 BSC 0.102 0.118 0.014 0.022 0.000 0.006 10° MAX B F J I K MECHANICALS MECHANICALS Copyright  2000 Rev. 1.0b, 2002-07-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 LX8211 INTEGRATED PRODUCTS 150mA CMOS Low Dropout Regulator P RODUCTION D ATA S HEET NOTES W W W. Microsemi . COM NOTES NOTES PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright  2000 Rev. 1.0b, 2002-07-02 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9