LX8211A ® TM 150mA Low Dropout Regulator P RODUCTION D ATA S HEET KEY FEATURES DESCRIPTION Dropout Voltage Typically 140mV @ 100mA Ultra Low Shutdown Current Typically Less Than 1µA High Output Accuracy Trimmed to 0.25% Standard Pinout in SOT-23-5 Current and Over Temperature Protection Stable With Low Cost Ceramic Output Capacitor The PNP output transistor allows for ultra low dropout typically less than 140mV at 100mA. WWW . Microsemi .C OM The LX8211A adjustable voltage linear regulator combines low dropout, high accuracy, very low ground current and fast response in a very small footprint. Using the Enable pin the regulator 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 capacitor. APPLICATIONS IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com Battery Operated Systems Laptop, Notebook and PDA’s Cellular Telephones / Pagers Hand-Held Instruments Linear post Regulators for SMPS PRODUCT HIGHLIGHT ⎛ R2 ⎞ + ⎛ ⎞ VOUT = VADJ ⎜1+ IADJ R2⎟ ⎟ ⎜ ⎝ R1 ⎠ ⎝ ⎠ 1 VIN ON 3 + ¯ OFF VOUT Part 4 CBYP 470pF GND LX8211A COUT 10µF R1 ENABLE ADJUST CIN 1µF 5 2 R2 CBYP Optional for low noise LX8211A TJ (°C) PACKAGE ORDER INFO Plastic SOT-23 SE 5-PIN OUTPUT VOLTAGE PACKAGE MARKING RoHS Compliant / Pb-free -40 to 125 Adjustable LX8211A-00ISE E2C Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8211A-25ISE-TR) Copyright © 2006 Rev. 1.0, 2006-04-07 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX8211A ® TM 150mA Low Dropout Regulator P RODUCTION D ATA S HEET PACKAGE PIN OUT Input Voltage (VIN) ...................................................................................... -0.3V to +15V Enable Input ........................................................................................-0.3V to VIN + 0.3V Output Current (IOUT) ............................................................................................. 150mA Maximum Junction Temperature (TJ) ....................................................................... 150°C Peak Package Solder Reflow Temperature (40 second max. exposure)....... 260°C (+0, -5) 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 5 2 4 3 SE PACKAGE (Top View) RoHS / Pb-free 100% Matte Tin Lead Finish WWW . Microsemi .C OM ABSOLUTE MAXIMUM RATINGS 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 NAME PIN NUMBER VIN 1 DESCRIPTION Unregulated Input Supply Voltage GND 2 Ground Pin ENABLE 3 Enable Control Input, Enable High ADJUST 4 Adjust Control Input for Resistor Divider Network. VOUT 5 Regulated Output Voltage. Regulator stability is achieved with an external capacitor of 10µF. PACKAGE DATA Copyright © 2006 Rev. 1.0, 2006-04-07 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX8211A ® TM 150mA Low Dropout Regulator P RODUCTION D ATA S HEET Parameter Symbol Input Operating Voltage Range (Note 1) Minimum Output Voltage Enable Input Voltage Range Continuous Output Current Range Operating Temperature Range Input Capacitor (VIN to GND) Output Capacitor (VOUT to GND) VIN Min LX8211A Typ Units Max 3.0 13.0 V 2.3 V ENABLE 0 VIN IOUT TJ CIN COUT 0.1 150 125 -40 1.0 10 WWW . Microsemi .C OM RECOMMENDED OPERATING CONDITIONS mA °C µF µF 1.0* Note 1: The minimum VIN has to meet two conditions VIN > 3.0V 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 ≤ TJ ≤ 125°C except where noted. Test conditions: VIN = VOUT+1V, VOUT = 2.9V; IOUT = 10mA; CIN = 1µF; COUT = 10µF; TJ = TA, using low duty cycle pulse testing methods. Parameter Symbol LX8211A Test Conditions Units Min Typ Max 1.225 1.25 1.275 V Adjust Reference Voltage VADJ Note 3 ΔV ⎞ Line Regulation ⎛⎜ O ΔVIN ⎟⎠ ⎝ VRV VIN = VOUT + 1.0 TO 13 Volts, IOUT=0.1mA 0.04 0.1 %/V ΔV ⎞ Load Regulation ⎛⎜ O ΔIO ⎟⎠ ⎝ VRI TJ = 25°C, IOUT: 0.5 TO 150mA 0.05 Dropout Voltage (VIN − VO ) VDO (Note2) 0.2 %VNOM IOUT: 0.5 TO 150mA 0.5 %VNOM ILOAD = 10mA, ΔVO = -1% 0.1 V 0.23 V ILOAD = 50mA, ΔVO = -1% 0.12 0.175 0.3 V 0.25 0.35 V Enable = Hi, IOUT = 100mA 600 1500 µA Enable = Hi, IOUT = 150mA 1300 2500 µA 5 µA 50 500 nA 25 µA Ground Pin Current IGND Adjust Input Bias Current IADJ Current Flows Out of Pin 4 Enable Pin Current IEN VEN = VIN Enable = Low (Standby) VIH Enable Threshold 2.0 V 0.18 VIL Short Circuit Current Limit IOUTSC Power Supply Rejection Ratio PSRR Output Noise eN Thermal Shutdown Temperature TSD VOUT = 0V 400 V mA TJ = 25°C, f = 120Hz 75 dB TJ = 25°C, COUT = 10µF 260 nv /√Hz 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. Note 3: Limits require operation within recommended operating conditions. Copyright © 2006 Rev. 1.0, 2006-04-07 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 ELECTRICALS ILOAD = 100mA, ΔVO = -1% ILOAD = 150mA, ΔVO = -1% LX8211A ® TM 150mA Low Dropout Regulator P RODUCTION D ATA S HEET VIN VOUT Thermal Shutdown ADJUST + Current Limit ENABLE WWW . Microsemi .C OM BLOCK DIAGRAM Control Logic - VREF GND LX8211A Figure 1 – Simplified Adjustable Version Block Diagram BLOCK DIAGRAM Copyright © 2006 Rev. 1.0, 2006-04-07 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX8211A ® TM 150mA Low Dropout Regulator P RODUCTION D ATA S HEET 2.915 1.252 2.91 V ADJUST, Volts V ADJUST, Volts 1.25 1.248 1.246 1.244 2.905 2.9 2.895 2.89 1.242 2.885 1.24 2.88 -50 1.238 -50 WWW . Microsemi .C OM TYPICAL CHARACTERISTICS Typical performance characteristics, unless otherwise specified are: CIN = 1µF, COUT = 10µF, CBY = 470pF, VIN = 4V, VOUT = 2.9V, TA = 25°C, ENABLE is tied to VIN. VOUT (Programmed to 2.9V) vs. TEMPERATURE V ADJUST vs. TEMPERATURE -25 0 25 50 75 100 125 -25 0 25 50 75 100 125 150 TEMPERATURE, °C 150 TEMPERATURE, °C DROPOUT VOLTAGE (Vin=3.9V) SHORT CIRCUIT CURRENT vs. TEMP and VIN 550 150mA 100mA 10mA 250 VIN=13V VIN=3.9V 525 500 200 CURRENT, mA DROPOUT VOLTAGE, mV 300 150 100 475 450 425 400 375 350 50 325 300 0 -50 -25 0 25 50 75 100 125 -50 150 -25 0 25 50 75 100 125 150 TEMPERATURE, °C TEMPERATURE, °C LINE and LOAD REGULATION GROUND CURRENT vs IOUT (Vin=3.9V) 2.25 0.30 150mA 100mA 10mA 2.00 0.25 VOUT, % CHANGE CURRENT, mA 1.75 1.50 1.25 1.00 0.75 0.50 0.20 0.15 LINE (3.9-13v) 0.10 LOAD(0.5MA-150MA) 0.05 0.25 -50 -25 0 25 50 75 100 125 150 TEMPERATURE, °C Copyright © 2006 Rev. 1.0, 2006-04-07 -50 -25 0 25 50 75 100 125 150 TEMPERATURE, °C Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 CHARTS 0.00 0 LX8211A ® TM 150mA Low Dropout Regulator P RODUCTION D ATA S HEET WWW . Microsemi .C OM TYPICAL CHARACTERISTICS (CONTINUED) Typical performance characteristics, unless otherwise specified are: CIN = 1µF, COUT = 10µF, CBY = 470pF, VIN = 4V, VOUT = 2.9V, TA = 25°C, ENABLE is tied to VIN. Power Supply Rejection vs. Frequency 10MA LOAD CBYPASS = 470PF 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 100 1K 10K Enable Response VIN = 4V, CIN = 1µF, COUT = 10µF, CBYP = 470pF, IOUT = 100mA. CH2 = VOUT = 2.9V. CH1 - VENABLE VIN = 4V, CIN = 1µF, COUT = 10µF, CBYP = 470pF, IOUT = 100mA. CH2 = VOUT = 2.9V. CH1 = VIN from 3.5V to 4.5V Load Transient Response VIN = 4V, CIN = 1µF, COUT = 10µF, CBYP = 470pF, IOUT = 50mA. CH2 = VOUT = 2.9V. CH4 = ISTEP = 20mA to 70mA 100K Line Regulation Step Response Load Transient Response VIN = 4V, CIN = 1µF, COUT = 10µF, CBYP = 470pF, STEP Load = 100mA. CH2 = VOUT = 2.9V. CH4 = ISTEP = 20mA to 100mA CHARTS Copyright © 2006 Rev. 1.0, 2006-04-07 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 LX8211A ® TM 150mA Low Dropout Regulator P RODUCTION D ATA S HEET Description Minimum Load Requirement The LX8211A is a family of LDO (Low Dropout) 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 PNP power device provides low dropout regulation with fast line and load transient response. It also includes internal current limit and thermal shutdown circuitry. This section contains information about the selection of external capacitors, thermal, and layout consideration. The LX8211A 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 100µA. 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 1µF over the entire operating temperature range. For the LX8211A connect a ceramic type capacitor (1µF) between VIN and ground. The LX8211A includes over current protection, when the output load current exceeds typically 400mA the circuit forces the regulator to 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 the LX8211A, 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 LX8211A a ceramic, tantalum, or electrolytic capacitor with the minimum recommended capacitance value at 10µF with ESR between 5mΩ and 1Ω will satisfy the stability for whole operating range. The LX8211A-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: ⎡ ⎣ R2 ⎤ + [I • R2] R1 ⎥⎦ ADJ 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 does not exceed its 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) For the SOT23 package, thermal resistance, θJA is 220°C/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. Enable 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: 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 7 APPLICATION The Enable pin allows the LX8211A 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 LX8211A off and reduces the supply current to less than 1µA. 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 © 2006 Rev. 1.0, 2006-04-07 Thermal protection shuts the LX8211A down when the junction temperature exceeds approximately 150°C; there is no appreciable thermal hysteresis. (Note: power dissipation resulting from quiescent current is negligible) Adjustable Output Voltage VOUT = 1.25⎢1 + Temperature Protection WWW . Microsemi .C OM APPLICATION INFORMATION LX8211A ® TM 150mA Low Dropout Regulator P RODUCTION D ATA S HEET SE WWW . Microsemi .C OM PACKAGE DIMENSION 5 Pin Plastic SOT-23 D Dim 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 © 2006 Rev. 1.0, 2006-04-07 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 LX8211A TM ® 150mA Low Dropout Regulator P RODUCTION D ATA S HEET WWW . Microsemi .C OM 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 © 2006 Rev. 1.0, 2006-04-07 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9