LX8941 ® TM Adjustable Low Dropout Regulator P RODUCTION D ATA S HEET KEY FEATURES DESCRIPTION 2% Internally Trimmed Output Output Current In Excess of 1A Input – Output Differential Less Than 0.8V @ 1A Reverse Battery Protection Short Circuit Protection Internal Thermal Overload Protection Available in 5-Lead Plastic TO-220 & Surface-Mount TO-263 This feature makes it ideal for some processor applications that require 4V operation from a 5V supply. In addition, the LX8941 provides an on / off switch that reduces the IC quiescent current when activated, making it ideal for battery operated applications. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com WWW . Microsemi .C OM The Microsemi LX8941 is an adjustable, low dropout regulator rated for more than 1A of output current. It can regulate with as low as 0.8V headroom between the input and output voltages, at 1A output current, thus minimizing power dissipation. In addition, it can be used in applications where worst case supplies require a low input / output differential to maintain regulation. PRODUCT HIGHLIGHT Dropout Voltage vs. Output Current vs. Temperature 10 µF Part LX8941 OUT ADJ R1 412 22µF ON R2 187 OFF 600 4V Dropout Voltage - (mV) IN 5V 500 400 300 200 125°C 25°C 100 -40°C 0 100 500 1000 Output Current (mA) LX8941 PACKAGE ORDER INFO TA (°C) 0 to 70 P Plastic TO-220 5 pin DD Plastic TO-263 5 Pin RoHS Compliant / Pb-free Transition DC: 0543 RoHS Compliant / Pb-free Transition DC: 0535 LX8941CP LX8941CDD Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8941CDD-TR) Copyright © 2001 Rev. 1.0, 2011-02-04 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX8941 ® TM Adjustable Low Dropout Regulator P RODUCTION D ATA S HEET ABSOLUTE MAXIMUM RATINGS PACKAGE PIN OUT TAB is GND 5 ON/OFF 4 ADJ 3 GND 2 VO 1 VIN P PACKAGE (Top View) 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. TAB is GND THERMAL DATA P ON/OFF 4 ADJ 3 GND 2 VO VIN 1 Plastic TO-220 5-Pin THERMAL RESISTANCE-JUNCTION TO TAB, θJT THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA DD 5 WWW . Microsemi .C OM Input Voltage (VIN) ....................................................................................................... 26V Operating Temperature Range ................................................................................... 150°C Storage Temperature Range ........................................................................ -65°C to 150°C Lead Temperature (Soldering 10 seconds) ................................................................. 300°C Package Peak Temp. for Solder Reflow (40 seconds maximum exposure).... 260°C (+0 -5) DD PACKAGE 4.5°C/W 60°C/W (Top View) RoHS / Pb-free 100% matte Tin Lead Finish Plastic TO-263 5-Pin THERMAL RESISTANCE-JUNCTION TO CASE, θJC THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 4.5°C/W 60°C/W 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. RECOMMENDED OPERATING CONDITIONS Parameter Symbol Input Voltage Load Current (with Adequate Heat sinking) Input Capacitor (VIN to GND) Output Capacitor with ESR of min 0.1Ω, 10Ω max*., (VO to GND) VIN IL Min 3.8 5 0.1 10 LX8941 Typ Max 26 1000 Units V mA µF µF * At low output current levels the range of acceptable ESR values may be narrower, and should be evaluated to insure stability PACKAGE DATA Copyright © 2001 Rev. 1.0, 2011-02-04 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX8941 ® TM Adjustable Low Dropout Regulator P RODUCTION D ATA S HEET Parameter ADJ Pin Voltage (Note 2) Line Regulation Load Regulation Symbol VADJ ∆VOI ∆VOL IADJ ICL VO RMS IO = 0A, TA = 25°C VO + 2V < VIN < 26V, IO = 5mA 50mA < IO < 1A, VO = VADJ IO = 100mA IO = 500mA IO = 1A IO = < 5mA, 7 < VIN < 26V IO = 500mA IO = 1000mA VIN = 10V, IO = 1A VIN = 26V 10Hz – 100kHz, IO = 5mA RR fO = 120Hz, 1VRMS, IO = 100mA Dropout Voltage ∆V Quiescent Current IQ Adjust Pin Current Current Limit Output Noise Voltage (Note 3) Test Conditions Min 1.225 1 Long Term Stability (Note 3) ` Ripple Rejection (Note 3) Enable Logic Section On Threshold Voltage On Threshold Current Off Threshold Voltage Off Threshold Current LX8941 Typ 1.25 1 10 150 275 400 3 30 115 2 1.2 150 Max 1.275 50 50 300 500 800 15 50 180 20 20 66 2 0.1 -10 50 0.8 -0.3 Units V mV mV mV mV mV mA mA mA µA A µVRMS mV / 1000hr dB WWW . Microsemi .C OM ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following characteristics apply over the operating ambient temperature of 0°C to 125°C for the LX8941CP & LX8941CDD; VIN = 10V, IO = 1A, COUT = 22µF and are for DC characteristics only. Low duty cycle pulse testing techniques are used which maintain junction and case temperatures equal to the ambient temperature. Note 2: The output voltage range is 4V to 25V and is determined by the two external resistors, R1 and R2. See Product Highlight. V µA V µA Note 3: These parameters although guaranteed, are not tested in production. SIMPLIFIED BLOCK DIAGRAM INPUT VOLTAGE VIN C1* 0.1µF LX8941 VO OUTPUT VOLTAGE C2 10µF Thermal Shutdown + ON ELECTRICALS ON / OFF ADJ ON / OFF Circuit OFF GND Figure 1 – Simplified Block Diagram Copyright © 2001 Rev. 1.0, 2011-02-04 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX8941 ® TM Adjustable Low Dropout Regulator P RODUCTION D ATA S HEET PACKAGE DIMENSIONS WWW . Microsemi .C OM DD 5-Pin Plastic TO-263 I A Dim A B C D E F G H I J K M N MILLIMETERS MIN MAX 10.03 10.67 8.51 9.17 4.19 4.59 1.14 1.40 0.330 0.51 0.74 0.89 1.57 1.83 2.29 2.79 – 1.65 0 0.25 14.60 15.87 7° 3° INCHES MIN MAX 0.395 0.420 0.335 0.361 0.165 0.181 0.045 0.055 0.013 0.020 0.029 0.035 0.062 0.072 0.090 0.110 – 0.065 0 0.010 0.575 0.625 7° 3° Dim A B C D F G J K N R S T MILLIMETERS MIN MAX 14.23 16.51 9.66 10.66 3.56 4.82 0.46 0.89 3.56 4.06 3.40 0.31 1.14 12.70 14.73 6.80 TYP 2.04 2.92 1.14 1.39 5.85 6.85 INCHES MIN MAX 0.560 0.650 0.380 0.420 0.140 0.190 0.018 0.035 0.140 0.160 0.134 0.012 0.045 0.500 0.580 0.268 TYP 0.080 0.115 0.045 0.055 0.230 0.270 D C B K M N H E F G 0° -8° J Seating Plane P 5-Pin Plastic TO-220 B S F T A 1 C 5 R D J 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. G N Copyright © 2001 Rev. 1.0, 2011-02-04 MECHANICALS K Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX8941 TM ® Adjustable Low Dropout Regulator P RODUCTION D ATA S HEET NOTES WWW . Microsemi .C OM 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 © 2001 Rev. 1.0, 2011-02-04 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5