LX8211 I N T E G R A T E D 150mA CMOS Low Dropout Regulator P R O D U C T S P RODUCTION D ATA S HEET KEY FEATURES DESCRIPTION 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 (typ<140uA) and it is nearly eliminated (typ<1uA) in shutdown. The PMOS output transistor allows for ultra low dropout typically less than 300mV at 100mA. ! Dropout Voltage typically 175mV @ 100mA ! Ultra low shutdown Current typically less than 1uA ! High Output accuracy trimmed to 0.25% ! Standard pinout in SOT-23-5 ! Noise Bypass feature available ! Current and Over Temperature protection ! Stable with low cost ceramic output capacitor APPLICATIONS ! ! ! ! ! IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com 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. Battery Operated Systems Laptop, Notebook and PDA’s Cellular Telephones/pagers Hand-Held Instruments Linear post regulators for SMPS PRODUCT HIGHLIGHT CIN 1µF VIN ON ENABLE OFF VOUT + ¯ CBY/ADJUST GND COUT 1µF 470pF Optional TJ (°°C) PACKAGE MARKING LX8211 -40 to 125 -40 to 125 -40 to 125 -40 to 125 -40 to 125 -40 to 125 PACKAGE ORDER INFO Plastic SOT-23 OUTPUT VOLTAGE SE 5-PIN Adjustable LX8211-00ISE 2.5V LX8211-25ISE 2.7V LX8211-27ISE 2.8V LX8211-28ISE 3.0V LX8211-30ISE 3.3V LX8211-33ISE 82A1 82B1 82D1 82E1 82G1 82K1 Note: Available in Tape & Reel. Append the letter “T” to the part number. (i.e. LX8211-25ISET) 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 1 LX8211 I N T E G R A T E D 150mA CMOS Low Dropout Regulator P R O D U C T S P RODUCTION D ATA S HEET ABSOLUTE MAXIMUM RATINGS PACKAGE PIN OUT Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal. 1 W W W. Microsemi .COM Input Voltage (VIN).........................................................................................-0.3V to +7V Enable Input ........................................................................................... -0.3V to VIN+.3V Output Current (IOUT) ............................................................................................. 150mA Operating Temperature Range..................................................................... -40 to +125 °C Maximum Junction Temperature (TJ).......................................................................150 °C 5 2 3 4 SE PACKAGE (Top View) THERMAL DATA SE 5-PIN SOT-23 PACKAGE Thermal Resistance – Junction to Ambient, θJA # # 220°C/W 220°C/W Two – Layer Board Four – Layer Board Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. FUNCTIONAL PIN DESCRIPTION PIN PIN NAME DESCRIPTION NUMBER VIN 1 Unregulated input supply voltage GND 2 Ground Pin ENABLE 3 Enable Control Input, Enable High CBY/ADJUST 4 Reference bypass input. Adding an additional external capacitor reduces output noise . Or adjust control input for LX8211-00. VOUT 5 Regulated output voltage. Regulator stability is achieved with external capacitor of 1uF APPLICATION 1 VIN 5 VOUT ON ¯ OFF CIN R1 ENABLE CBY/ADJUST GND 2 4 R2 PACKAGE DATA 3 + COUT R1 VOUT = VADJ 1 + R2 Figure 1 – Output Voltage Set Externally 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 2 LX8211 I N T E G R A T E D 150mA CMOS Low Dropout Regulator P R O D U C T S P RODUCTION D ATA S HEET Parameter Symbol Input Operating Voltage Range (Note 1) Enable Input Voltage Range Continuous Output Current Range Input Capacitor (VIN to GND) Output Capacitor (VOUT to GND) Min LX8211-xx Typ Units Max VIN 2.5 6 ENABLE 0 VIN + .3V IOUT CIN COUT 1.0 1.0 V 150 .1 W W W. Microsemi .COM RECOMMENDED OPERATING CONDITIONS mA 1.0* 2.2* µF µF Note 1: The minimum VIN has to meet two conditions VIN>2.5V and VIN>VOUT+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 LX8211-XX Test Conditions Min Output Voltage (-25, -27, -28, -30, -33) VO TJ = 25°C IOUT = 0mA to 150mA, VIN = VOUT + .5V to 6V Typ Units Max -1 1 %VNOM -2.5 2.5 %VNOM 1.175 1.187 1.20 V VADJ TJ = 25°C IOUT = 0mA to 150mA, VIN = 2.85V to 6V ∆VO ∆VIN VRV VIN: VOUT + 0.5 TO 6 VOLTS, IOUT=0.1mA 0.04 0.15 %/V ∆VO ∆I O VRI TJ = 25°C, IOUT: 0.5 TO 150mA 0.5 1.0 %VNOM 1.5 %VNOM Adjust Reference Voltage (-00) Line Regulation Load Regulation 1.163 1.14 IOUT: 0.5 TO 150mA ILOAD = 1mA, ∆VO = -1% Dropout Voltage (VIN − VO ) (Note2) VDO 0.05 V ILOAD = 50mA, ∆VO = -1% 0.1 0.175 V ILOAD = 100mA, ∆VO = -1% 0.175 0.3 V ILOAD = 150mA, ∆VO = -1% 0.25 0.4 V 140 Enable = Hi 220 µA Enable = Low 1 µA Adjust Input Bias Current IADJ VADJ = 1.175V 100 nA Enable Pin Current IEN VEN = VIN 100 nA VIH Enable Threshold 2.0 V 0.4 VIL Short Circuit Current Limit Power Supply Rejection Ratio IOUTSC PSRR Output Noise eN Thermal Shutdown Temperature TSD VOUT = 0V ELECTRICALS IGND ISTBY Ground Pin Current 400 V mA TJ = 25°C, f = 120Hz 50 dB TJ = 25°C, COUT = 10uF,CBYPASS = 470 pF 50 µV 170 °C 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 I N T E G R A T E D P R O D U C T S 150mA CMOS Low Dropout Regulator P RODUCTION D ATA S HEET BLOCK DIAGRAM W W W. Microsemi .COM VIN VOUT RA Thermal Shutdown + Current Limit Control Logic ENABLE - CBY/ADJUST RB VREF GND Figure 2 – Simplified Fixed Version Block Diagram (LX8211-25 / 27 / 28/ 30/ 33ISE) VIN VOUT Thermal Shutdown + Current Limit ENABLE Control Logic CBY/ADJUST - 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 I N T E G R A T E D P R O D U C T S 150mA CMOS Low Dropout Regulator P RODUCTION D ATA S HEET Description Minimum Load Requirement 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. 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. Input Capacitor Short Circuit Current Protection 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. The LX8211 includes over current protection, when the output load current exceeds typically 400mA the circuit forces the regulator decrease in output. 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 R1 VOUT = VADJ 1 + R2 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: 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 Layout Consideration: 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 The thermal protection shuts the LX8211 down when the junction temperature exceeds approximately 1500C, there is no appreciable thermal hysteresis. 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. Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 APPLICATION 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: Temperature Protection W W W. Microsemi .COM APPLICATION INFORMATION LX8211 I N T E G R A T E D 150mA CMOS Low Dropout Regulator P R O D U C T S P RODUCTION D ATA S HEET W W W. Microsemi .COM 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. OUTPUT VOLTAGE vs TEMPERATURE VADJ VOLTAGE vs TEMPERATURE 2.525 1.185 2.52 2.515 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 1.18 1.175 1.17 1.165 2.51 2.505 2.5 2.495 2.49 2.485 1.16 2.48 2.475 1.155 -50 -25 0 25 50 TEMPERATURE (°C) 75 100 -50 125 D R O P O UT V O LT A G E v s T E M P E R A T UR E -25 0 25 50 TEMPERATURE (°C) 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 350 325 -340 300 -350 275 -360 250 -370 IL =150mA 225 200 -380 175 -390 150 V IN =5V -400 IL =100mA 125 - 410 100 75 -420 50 -430 -50 - 25 0 25 50 75 100 V IN =4V V IN =3V - 50 125 -25 0 25 50 75 100 125 TEMPERATURE ( °C) TEMPERATURE (°C) POWER SUPPLY / RIPPLE REJECTION vs FREQUENCY DROPUT REGION G R O UN D C UR R EN T v s S UP P LY V O LT A G E 0 -50 0dB - 100 -40 - 150 85 50dB CHARTS PSSR 25 -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) Copyright 2000 Rev. 1.0b, 2002-07-02 Frequency (kHz) Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 100 Page 6 LX8211 I N T E G R A T E D 150mA CMOS Low Dropout Regulator P R O D U C T S P RODUCTION D ATA S HEET POWER SUPPLY RIPPLE REJECTION VS. FREQUENCY POWER SUPPLY / RIPPLE REJECTION VS. FREQUENCY 0dB 0dB CBYPASS = 0 PSSR CBYPASS = 470pF PSSR W W W. Microsemi .COM TYPICAL CHARACTERISTICS (CONTINUED) 50dB 100dB 50dB 100dB Frequency (kHz) 0.1 100 0.1 ENABLE RESPONSE VIN = 3.3V CIN = 1µF, COUT = 22µF, CBVP = 470pF, IOUT = 100mA Frequency (kHz) 100 LOAD TRANSIENT RESPONSE `VIN = 3.3V, CIN = 1µF, COUT = 2.2µF, STEP Load = 50mA VIN VOUT = 2.5V 50mV / DIV 1V / DIV 50mV / DIV VOUT = 2.5V VENABLE 5V / DIV 50mA / DIV 20µs / DIV 100µs / DIV LINE REGULATION STEP RESPONSE CIN = 1µF, COUT = 22µF, CBVP = 470pF, IOUT = 100mA 10mV / DIV ISTEP = 50mA LOAD TRANSIENT RESPONSE VIN = 3.3V, CIN = 1µF, COUT = 2.2µF, STEP Load = 100mA 50mV / DIV VOUT = 2.5V VOUT = 2.5V CHARTS VIN 3.75V 100m A/ DIV 2.75V 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 I N T E G R A T E D 150mA CMOS Low Dropout Regulator P R O D U C T S P RODUCTION D ATA S HEET SE W W W. Microsemi .COM PACKAGE DIMENSION 5 Pin Plastic SOT-23 Dim D G H E A1 A C B F J I A A1 B C D E F G H I J K 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 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. 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 I N T E G R A T E D P R O D U C T S 150mA CMOS Low Dropout Regulator P RODUCTION D ATA S HEET 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