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| LX8820 TM (R) 3.3V/1.0A Ultra Low Dropout Regulator PRODUCTION DATA SHEET DESCRIPTION The LX8820 is an ultra lowdropout single output positivevoltage linear regulator. The regulator has a precise, fixed output capable of delivering 1.2 amps. The LX8820 output is internally programmed for 3.3V. Regulator stability is maintained with any capacitor ESR, allowing ceramic, tantalum or electrolytic types. Capacitance range is flexible beginning with 2.2F to large values. The CMOS wafer process increasing regulator efficiency by minimizing operating ground current (typically <200A). compared to BiPolar technology . The low RDSON of the PMOS output stage results in ultra low dropout (typically 0.45V @ 1A). Output voltage overshoot is controlled using slew rate control, as VIN is applied, typically VOUT overshoot < 2% for VIN 1V/S ramp. Transient response to a Step Load is fast and controlled, VOUT overshoot remains within 2% of nominal for 400mA step sizes. Thermal Shutdown, Current Limit and Short Circuit Current protection are integrated on-chip for survival during fault conditions. Microsemi's small 3x3mm body size (MO-229) package enables maximum power dissipation with a minimum surface mount area. KEY FEATURES Accurate Output Voltage Typical Dropout of 0.7V at 1A and 0.25V at 0.8A Independent Thermal and Current Limit Protection Low Tolerance Load Regulation (0.4%) Wide DC Supply Voltage of 4V to 10V Loop Stability Independent of Output Capacitor Type JEDEC MO-229 surface mount package / RoHS Compliant APPLICATIONS/BENEFITS 5V to 3.3V Regulators Hard Disk Drives, CD-ROMs ADSL and Cable Modems Battery Charging Circuits Instrumentation PC Peripherals WWW .Microsemi .C OM IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com APPLICATION CIRCUITS 1 VIN 3.8 to 6V 4.7F VIN GND N.C. VIN VOUT VOUT 6 5 2 3 VOUT 3.3V @ 1A 4 4.7F LX8820 LX8820 LX8820 TJ (C) 0 to 125 PACKAGE ORDER INFO Plastic MLP 6OUTPUT V LM PIN RoHS Compliant / Pb-free Part Marking 882J or 8820 3.3V LX8820-33CLM Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX8820-33CLM-TR) Copyright (c) 2004 Rev. 1.1, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX8820 TM (R) 3.3V/1.0A Ultra Low Dropout Regulator PRODUCTION DATA SHEET ABSOLUTE MAXIMUM RATINGS Input Voltage (VIN) ....................................................................................................... 10V Load Current (Internally Limited)................................................................................... 2A Power Dissipation ................................................................................... Internally Limited Short-Circuit Protection ........................................................................................Indefinite Operating Junction Temperature................................................................................ 150C Storage Temperature Range........................................................................ -65C to 150C RoHS / Pb-free Peak Package Solder Reflow Temperature (40 second maximum exposure) ....................................................................260C (+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. PACKAGE PIN OUT WWW .Microsemi .C OM VIN GND N.C. 1 2 3 LM PACKAGE (Top View) 6 5 4 VIN VOUT VOUT Heatsink must be connected to GND or left floating (see pg 7 for details) . N/C = Not internally connected, don't care for PCB layout consideration. RoHS / Pb-free 100% Matte Tin Lead Finish THERMAL DATA LM Plastic MLP 6-Pin 8C/W 29-35C/W THERMAL RESISTANCE-JUNCTION TO TAB, JT THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA (Typical, depending on mounting/pcb layout) Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. JA can vary significantly depending on mounting technique. (See Application Notes Section: Thermal considerations) FUNCTIONAL PIN DESCRIPTION PIN NAME VIN GND VOUT DESCRIPTION Positive unregulated supply input for the regulator. Bypass to GND with at least 2.2F of low ESR and ESL capacitance. Common terminal for ground reference. The input and output bypass capacitors should be connected to this pin. Regulator output. It is recommended to bypass to GND with at least 2.2F. Size your output capacitor to meet the transient loading requirement. If you have a very dynamic load, a lower ESR capacitor will improve the response to these load steps. PACKAGE DATA PACKAGE DATA RECOMMENDED MAX OPERATING CONDITIONS Parameter Input Voltage Load Current (with adequate heat sinking) Operating Junction Temperature Symbol VIN IL TJ LX8820-33 Typ Units V mA C Min 4.5 Max 10 1200 125 Copyright (c) 2004 Rev. 1.1, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX8820 TM (R) 3.3V/1.0A Ultra Low Dropout Regulator PRODUCTION DATA SHEET ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature 0C TA 125C except where otherwise noted and the following test conditions: VIN = 5V, IOUT = 10mA, C1= 4.7F (ceramic), C2= 4.7F (ceramic), & TJ = TA using low duty cycling methods. LX8820-33 Parameter Symbol Test Conditions Units Min Typ Max Fixed Output (3.3V) Output Voltage Line Regulation Load Regulation Dropout Voltage Transient Response; VOUT Overshoot at Start-Up Transient Response; VOUT Droop to Step Load Current Limit Minimum Load Current Quiescent Current Ripple Rejection RMS Output Noise (% of VOUT) Thermal Shutdown VOUT VOUT(VIN) VOUT(IOUT) VDO 5mA < IOUT < 1A, 4.75V < VIN < 5.25V 4.5V < VIN < 5.5V, 5mA < IOUT < 1A 10mA < IOUT < 1A, VIN = 4.75V ILOAD = 1A, VOUT = -1% ILOAD = 1A, VIN = 4.0V VOUT VOUT IOUT (MAX) IL IQ PSRR VOUT (RMS) TJSD VIN step 0V to 5V; tr 1s; 10mA < IOUT < 1A Note 2 VIN = 5V; tr 1s; 10mA < IOUT < 1A Note 2 VIN < 5.5V Note 1 IOUT =5mA IOUT =1000mA, VIN < 7V f=120Hz, VIN = 5V 10Hz < f < 10kHz 140 50 3.0 1.0 1.5 0 205 550 75 0.003 160 0.1 300 650 3.0 3.234 3.300 4 2 0.45 3.3 3.383 3.63 V V A mA A dB %/V C 3.366 9 15 V mV mV V WWW .Microsemi .C OM Note 1: Minimum load current is defined as the amount of output current required to maintain regulation. Note 2: Guaranteed by design. BLOCK DIAGRAM VIN C1 10F VOUT C2 10F Bias + - ELECTRICALS ELECTRICALS 1.25V VREF LX8820 GND Figure 1 - Fixed Output Note: Application Circuit above using ceramic capacitors Copyright (c) 2004 Rev. 1.1, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX8820 TM (R) 3.3V/1.0A Ultra Low Dropout Regulator PRODUCTION DATA SHEET CHARACTERISTIC CURVES STEP LOAD STABILITY WWW .Microsemi .C OM LX8820 TEMP STABILITY, Iout=5ma 3.304 3.302 3.300 3.298 3.296 3.294 3.292 3.290 3.288 3.286 3.284 3.282 3.280 -50 -25 0 25 50 75 TEMP, C Vo VOLT VIN=4.5V VIN=5.25V VIN=7V 100 125 150 CH1: (Blue) VOUT, CH4: ISTEP 200mA/div, CIN = COUT = 4.7F Ceramic, Load Current, dc =100mA SUPPLY VOLTAGE, FAST TURN ON (TRISE = 10S) SHORT CIRCUIT AND RECOVERY CH1: VOUT, CH4: ISTEP, CIN = COUT = 10F Ceramic CH1: VIN (Light Blue) CH2: VOUT, CIN = COUT = 10F Ceramic, Load Current, dc = 1A CH3: (Magenta) VOUT, CH4: IOUT 1A/div, CIN = COUT = 10F Ceramic CHARTS CHARTS Copyright (c) 2004 Rev. 1.1, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX8820 TM (R) 3.3V/1.0A Ultra Low Dropout Regulator PRODUCTION DATA SHEET APPLICATION INFORMATION Description The LX8820 is part of a family of LDO (Low Drop-Out) linear regulators in the JEDEC MO-229 package that offer maximum power dissipation in a low profile surface mount technology. The LX8820 output is fixed at 3.3V output and can supply up to one amp with a regulator design optimized for system efficiency by consuming minimal ground current and directing quiescent current to the load. Thermal Considerations WWW .Microsemi .C OM 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 150C 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. Also peak output power should be considered for each individual output. Power dissipation for the regulator can be calculated using the following equation: Input Capacitor To improve load transient response and noise rejection an input bypass capacitor of at least 2.2F is required. Generally we recommend a 4.7F ceramic or tantalum or 22F electrolytic capacitor. Output Capacitor The regulator requires an output capacitor connected between VOUT to GND to stabilize the internal control loop. Many types of capacitors are available, with different capacitance values tolerances, temperature coefficients and equivalent series resistance. We recommend a minimum of 4.7F. To ensure good transient response from the power supply system under rapidly changing current load conditions, designers generally use additional output capacitors connected in parallel. Such an arrangement serves to minimize the effects of the parasitic resistance (ESR) and inductance (ESL) that are present in all capacitors. The regulator has been tested stable with capacitor ESR's in the range of 0.01 to 2 ohms. We have found it best to use the same type of capacitor for both input and output bypass. PD = (VIN(MAX) - VOUT ) * IOUT (Note: power dissipation resulting from quiescent (ground) current is negligible) Junction temperature of the integrated circuit can be calculated using: TJUNCTION = TJUNCTION-TAB RISE + TTAB-AMB RISE + TAMB TTAB = PD MAX * JT TTAB-AMB = PD REG * PCB An example: Given conditions: TA = 70C, VIN= 5.0V, Vout= 3.3V, Iout= 200mA. Calculated values: TJ-TAB REG = (5V - 3.3V) * (200mA) * 8C/W = (340mW) * 8C/W = 2.7C TTAB-AMB RISE = (340mW) * 32C/W = 10.9C TJUNCTION = 2.7C + 10.9C + 70C = 83.6C It is important to note that although each output of the regulator will produce up to 1.5A in current, the total power dissipation may limit the useful total current draw. The junction temperature should be calculated to insure the maximum junction temperature is not exceeded. Minimum Load Requirement The LX8820 has a minimum load requirement for proper output regulation specified at 0.1mA. Temperature Protection The thermal protection shuts the LX8820 down when the junction temperature exceeds 140C. Exposure to absolute maximum rated conditions for extended periods may affect device reliability (see Thermal Considerations below). Current Limit Protection The LX8820 includes over current protection. When the output load current exceeds typically 1.5A, the circuit forces the regulator output to decrease. APPLICATIONS APPLICATIONS Copyright (c) 2004 Rev. 1.1, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 LX8820 TM (R) 3.3V/1.0A Ultra Low Dropout Regulator PRODUCTION DATA SHEET MECHANICAL DRAWINGS JEDEC - MO229 D 6-Pin Plastic Micro Lead Package Dim L WWW .Microsemi .C OM L2 E K L2 D2 E2 e b A A3 A1 Internally Connected together, but isolated from all other terminals A A1 A3 b D E e D2 E2 K L L2 MILLIMETERS MIN MAX 0.80 1.00 0.00 0.05 0.20 REF 0.30 0.45 2.90 3.10 2.90 3.10 0.95 BSC 1.90 2.25 1.15 1.65 0.20 0.30 0.45 0.10 0 12 INCHES MIN MAX 0.032 0.040 0 0.002 0.008 REF 0.012 0.018 0.114 0.122 0.114 0.122 0.037 BSC 0.075 0.086 0.045 0.065 0.008 0.012 0.018 0.004 0 12 NOTES MECHANICALS MECHANICALS 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 (c) 2004 Rev. 1.1, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 |
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