LX432ILP

LX432 TM ® Low Voltage Adjustable Precision Shunt Regulator P RODUCTION D ATA S HEET DESCRIPTION KEY FEATURES W WW . Microsemi . C OM The LX432 series are low-voltage precision adjustable shunt regulators with a reference voltage of 1.24V. The output voltage may be set to any value between 1.24V and 20V by two external resistors. These devices offer low output impedance for improved load regulation – typical output impedance is 200mΩ. The LX432 series operates with an operating current as low as 80µA, making these devices suitable for portable and micropower applications. Low voltage operation enables the LX432 to be used in the feedback loop of isolated low voltage power supplies. The minimum output voltage is determined by the LX432 output voltage plus the forward voltage drop of the opto-coupler LED (typically 1.24 + 1.4 = 2.64V minimum). See figure 12. The LX432 is offered in 3 lead SOT-23 or TO-92 packages, and is a drop-in replacement for the TLV431 and SC431L devices. Low Voltage Operation: 1.24V Reference Initial Voltage Reference Accuracy 1% Adjustable Output Voltage From VREF to 20V Typical Output Dynamic Impedance Less Than 250mΩ Sink Current Capability 80µA To 20mA Direct Alternative To TLV431 APPLICATIONS Low Voltage Adjustable Power Supplies Instrumentation Computers Portable Equipment IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com PRODUCT HIGHLIGHT V IN R1 V KA Cathode LX432 Anode Reference R2 GND LX 4 3 2 LX 4 3 2 PACKAGE ORDER INFO TA (°C) 0 to 70 -40 to 85 Copyright © 2000 Rev. 1.3, 2005-02-24 SC Package Marking 432C 432I SC Plastic SOT-23 3-Pin LP Plastic TO-92 3-Pin RoHS Compliant / Pb-free RoHS Compliant / Pb-free Transition DC: 0503 Transition DC: 0509 LX432CSC LX432ISC LX432CLP LX432ILP Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX432CSC-TR) TO-92 (LP) package also available in ammo-pack. Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 1 LX432 TM ® Low Voltage Adjustable Precision Shunt Regulator P RODUCTION D ATA S HEET W WW . Microsemi . C OM ABSOLUTE MAXIMUM RATINGS (NOTE 1) PACKAGE PIN OUT REF Cathode to Anode Voltage (VKA)..................................................................-0.3V to +20V Reference Input Current (IREF) .....................................................................-50µA to 10µA Continuous Cathode Current (IK)............................................................... -25mA to 25mA Operating Junction Temperature................................................................................ 150°C Storage Temperature....................................................................................-65ºC to 150°C RoHS / Pb-free Peak Package Solder Reflow Temperature (40 second maximum exposure) ....................................................................260°C (+0,-5) Note 1: 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 3 A NO DE CATHODE 2 SC PACKAGE – 3-PIN 3 . C ATHODE 2. A NODE THERMAL DATA 1. R EF LP PACKAGE – 3-PIN SC 3-Pin Plastic Package (PC Mounted) 220°C/W (Non-PC Mounted) 410°C/W Thermal Resistance – Junction to Ambient, θJA RoHS / Pb-free 100% Matte Tin Lead Finish (All Views Top View) LP 3-Pin Plastic Package 156°C/W Thermal Resistance – Junction to Ambient, θJA 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. BLOCK DIAGRAM Cathode (K) Ref(R) + PACKAGE DATA PACKAGE DATA V REF Anode(A) Figure 1 – Simplified Block Diagram Copyright © 2000 Rev. 1.3, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 2 LX432 TM ® Low Voltage Adjustable Precision Shunt Regulator P RODUCTION D ATA S HEET ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature for the LX432C with 0°C 70°C and the LX432I with -40°C < TA < 85°C except where otherwise noted. Parameter Reference Voltage Reference Voltage Drift (note 2) Ratio of VREF Change In Cathode Voltage Change (note 3) Reference Terminal Current Reference Current Drift (note 2) Minimum Cathode Current For Regulation Dynamic Impedance Off-State Cathode Current Symbol VREF ∆VREF Test Conditions IK = 10mA, VKA = VREF, TA = 25°C IK = 10mA, VKA = VREF, 0°C < TA < 70°C IK = 10mA, VKA = VREF, -40°C < TA < 85°C IK = 10ma, VKA = VREF to 16V, TA = 25°C IK = 10mA, VKA = VREF, TA=25°C, R1=10kΩ, R2=Open IK = 10mA, VKA = VREF, 0°C < TA < 70°C IK = 10mA, VKA = VREF, -40°C < TA < 85°C VKA = VREF, TA = 25°C IK = 0.1mA to 15mA, VKA = VREF, TA = 25°C VKA = 16V, TA = 25°C LX432 Typ 1.24 3 4 -1 0.1 0.05 0.1 55 0.2 0.004 W WW . Microsemi . C OM ≤ TA ≤ Min 1.228 Max 1.252 12 20 -2.7 0.5 0.3 0.4 80 0.4 Units V mV mV mV/V µA µA µA µA Ω µA ∆VREF ∆VKA IREF ∆IREF IK(MIN) ZKA IOFF Note 2: These parameters are guaranteed by design. ∆VREF Note 3: Ratio of change in reference input voltage to the change in cathode voltage ∆VKA ELECTRICALS ELECTRICALS Copyright © 2000 Rev. 1.3, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 3 LX432 TM ® Low Voltage Adjustable Precision Shunt Regulator P RODUCTION D ATA S HEET CHARACTERISTIC CURVES W WW . Microsemi . C OM STABILITY BOUNDARY CONDITION† 30 Unstable 25 VKA = 2V IK Cathode Current (mA) 20 Stable 15 VKA = 3V 10 5 VKA = VREF * 0.010 0.100 CL- Load Capacitance (uF) 1.000 10.000 0 0.001 Figure 2 – Stability * Unstable below 700µA as indicated † The unstable areas indicate loading conditions that may cause the device to oscillate. S STABILITY Copyright © 2000 Rev. 1.3, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 4 LX432 TM ® Low Voltage Adjustable Precision Shunt Regulator P RODUCTION D ATA S HEET CHARACTERISTIC CURVES W WW . Microsemi . C OM 1.242 1.241 1.24 1.239 1.238 1.237 1.236 1.235 -50 0.2 0.18 0.16 V REF: Reference Voltage (V) IREF: Reference Current(µA) 0 25 50 75 100 125 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 -50 0 25 50 75 100 125 TJ: Junction Temperature (°C) T J: Junction Temperature (°C) Figure 3 – Reference Voltage vs. Junction Temperature 900 800 700 IK: Cathode Current (µA) 600 500 400 300 200 100 0 - 100 -1 -0.8 -0.5 -0.3 0 0.25 0.5 0.75 1 1.25 1.5 ∆V REF / ∆V KA (mV/V) Figure 4 – Reference Current vs. Junction Temperature -1.2 -1 -0.8 -0.6 CHARACTERISTICS -0.4 -0.2 0 -50 0 25 50 75 100 125 Cathode Voltage (V) TJ: Junction Temperature (°C) Figure 5 – Cathode Current vs. Cathode Voltage Figure 6 – ∆VREF / ∆VKA vs. Junction Temperature Copyright © 2000 Rev. 1.3, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 5 LX432 TM ® Low Voltage Adjustable Precision Shunt Regulator P RODUCTION D ATA S HEET CHARACTERISTIC CURVES W WW . Microsemi . C OM 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -50 120 Minimum Cathode Current (µA) 100 80 60 40 20 0 -50 Dynamic Impedance (ohm) 0 25 50 75 100 125 0 25 50 75 100 125 T J: Junction Temperature (°C) T J: Junction Temperature (°C) Figure 7 – Dynamic Impedance vs. Junction Temperature Figure 8 – Minimum Cathode Current for Regulation vs. Junction Temperature 350 300 Noise Voltage (nV/sqrt(Hz)) 250 200 150 100 50 0.07 0.06 Off-State Current (µA) 0.05 0.04 0.03 0.02 0.01 0 -50 C CHARACTERISTICS 0 0 25 70 85 125 10 100 1K Frequency (Hz) 10K 100K T J: Junction Temperature (°C) Figure 9 – Off-State Current vs. Junction Temperature Figure 10 – Equivalent Input Noise Voltage vs. Frequency Copyright © 2000 Rev. 1.3, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 6 LX432 TM ® Low Voltage Adjustable Precision Shunt Regulator P RODUCTION D ATA S HEET PARAMETER MEASUREMENT INFORMATION W WW . Microsemi . C OM Input IK V KA V REF Figure 11 – Test Circuit For VKA = VREF Input IK R1 I REF V KA I nput I OFF V KA R2 V REF Figure 12 – Test Circuit For VKA > VREF Figure 13 – Test Circuit For IOFF VO = VKA = VREF × ⎜ 1 + ⎛ ⎝ R1 ⎞ R2 ⎠ ⎟ + IREF × R1 MEASUREMENT MEASUREMENT Copyright © 2000 Rev. 1.3, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 7 LX432 TM ® Low Voltage Adjustable Precision Shunt Regulator P RODUCTION D ATA S HEET TYPICAL APPLICATION W WW . Microsemi . C OM V IN 110 / 220V AC _ + + + V O UT 3.3V C ontroller U C 384x / LX155x DRV V CC I SEN SE GND V FB + + LX 432 Figure 12 – LX432 In A Power Supply Isolated Feedback Application 12V 3.3V 470µF 0.1µF 5 00 Ω 140 Ω 0.1µF LX432 120 Ω 1000µF 0.1µF 2.7V (e.g. Intel i740 ® c hipset) APPLICATIONS APPLICATIONS Figure 13 – LX432 in a 3.3V to 2.7V Low Dropout Regulator Application Copyright © 2000 Rev. 1.3, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 LX432 TM ® Low Voltage Adjustable Precision Shunt Regulator P RODUCTION D ATA S HEET PACKAGE DIMENSIONS W WW . Microsemi . C OM SC 3-Pin Plastic SOT-23 Dim A B C D E F G H I J Note: A D H E F G MILLIMETERS MIN MAX 0.89 1.12 0.37 0.51 0.085 0.18 2.80 3.04 1.20 1.40 0.89 1.09 1.78 2.05 2.10 2.64 0.35 0.55 0.013 0.10 INCHES MIN MAX 0.035 0.044 0.015 0.020 0.003 0.007 0.110 0.120 0.047 0.055 0.035 0.043 0.070 0.080 0.083 0.104 0.014 0.022 0.0005 0.0039 B J I C 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. LP 3-Pin Plastic TO-92 Dim J B D SECT x-x A x x V C N K N F A B C D F G H J K N V Note: MILLIMETERS MIN MAX 4.45 5.20 4.32 5.33 3.18 4.19 0.41 0.55 0.41 0.48 1.15 1.39 2.42 2.66 0.39 0.50 12.70 2.05 2.66 3.43 - INCHES MIN MAX 0.175 0.205 0.170 0.210 0.125 0.165 0.016 0.022 0.016 0.019 0.045 0.055 0.095 0.105 0.015 0.020 0.500 0.080 0.105 0.135 - MECHANICALS MECHANICALS G H 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. Copyright © 2000 Rev. 1.3, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 9 LX432 TM ® Low Voltage Adjustable Precision Shunt Regulator P RODUCTION D ATA S HEET NOTES W WW . 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 © 2000 Rev. 1.3, 2005-02-24 Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 10