LP38853S-ADJ

Product Folder Sample & Buy Support & Community Tools & Software Technical Documents LP38853 SNVS335F – DECEMBER 2006 – REVISED NOVEMBER 2016 LP38853 3-A Fast-Response High-Accuracy Adjustable LDO Linear Regulator With Enable and Soft Start 1 Features 3 Description • • • The LP38853 is a high-current, fast-response regulator that can maintain output voltage regulation with extremely low input-to-output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: VBIAS provides voltage to drive the gate of the NMOS power transistor; VIN is the input voltage which supplies power to the load. The use of an external bias rail allows the device to operate from ultra-low VIN voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an NMOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability. 1 • • • • Wide VBIAS Supply Operating Range: 3 V to 5.5 V Adjustable VOUT Range: 0.8 V to 1.8 V Dropout Voltage of 240 mV (Typical) at 3-A Load Current Precision VADJ Across All Line and Load Conditions: – ±1.5% VADJ for TJ = 25°C – ±2% VADJ for 0°C ≤ TJ ≤ +125°C – ±3% VADJ for –40°C ≤ TJ ≤ +125°C Overtemperature and Overcurrent Protection Stable with 10-µF Ceramic Capacitors −40°C to +125°C Operating Junction Temperature Range The fast transient response of this device makes it suitable for use in powering DSP and microcontroller core voltages, and switch-mode power-supply post regulators. • Dropout Voltage: 240 mV (typical) at 3-A load current • Low Ground Pin Current: 10 mA (typical) at 3-A load current • Soft Start: Programmable soft-start time 2 Applications • • • • ASIC Power Supplies in: – Desktops, Notebooks, Graphics Cards, and Servers – Gaming Set-Top Boxes, Printers, and Copiers Server Core and I/O Supplies DSP and FPGA Power Supplies SMPS Post-Regulator Device Information(1) PART NUMBER LP38853 PACKAGE BODY SIZE (NOM) DDPAK/TO-263 (7) 10.10 mm × 8.89 mm TO-220 (7) 14.986 × 10.16 mm SO PowerPAD™ (8) 4.89 mm × 3.90 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Simplified Schematic LP38853 VIN IN VOUT OUT CIN CFF VBIAS R1 BIAS CBIAS VEN SS COUT ADJ EN R2 GND CSS GND GND 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. LP38853 SNVS335F – DECEMBER 2006 – REVISED NOVEMBER 2016 www.ti.com Table of Contents 1 2 3 4 5 6 7 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 2 3 4 6.1 6.2 6.3 6.4 6.5 6.6 6.7 4 4 4 5 5 6 7 Absolute Maximum Ratings ...................................... ESD Ratings.............................................................. Recommended Operating Conditions....................... Thermal Information .................................................. Electrical Characteristics........................................... Timing Requirements ................................................ Typical Characteristics .............................................. Detailed Description ............................................ 11 7.1 Overview ................................................................. 11 7.2 Functional Block Diagram ....................................... 11 7.3 Feature Description................................................. 11 7.4 Device Functional Modes........................................ 14 8 Application and Implementation ........................ 15 8.1 Application Information............................................ 15 8.2 Typical Application ................................................. 15 9 Power Supply Recommendations...................... 19 10 Layout................................................................... 19 10.1 Layout Guidelines ................................................. 19 10.2 Layout Examples................................................... 19 11 Device and Documentation Support ................. 20 11.1 11.2 11.3 11.4 11.5 Documentation Support ........................................ Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 20 20 20 20 20 12 Mechanical, Packaging, and Orderable Information ........................................................... 20 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision E (November 2015) to Revision F • Page corrected layout drawings..................................................................................................................................................... 19 Changes from Revision D (April 2015) to Revision E Page • Changed part number to LP38853 throughout data sheet .................................................................................................... 1 • Added Device Information and Pin Configuration and Functions sections, ESD Ratings and Thermal Information tables, Feature Description, Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable Information sections................................................................................................................................................................ 1 • Deleted Lead temperature from Abs Max table; it is in POA ................................................................................................ 4 • Added updated thermal information ...................................................................................................................................... 5 • Deleted out-of-date heatsinking subsections ....................................................................................................................... 17 Changes from Revision C (April 2013) to Revision D • 2 Page Changed layout of National Data Sheet to TI format ........................................................................................................... 19 Submit Documentation Feedback Copyright © 2006–2016, Texas Instruments Incorporated Product Folder Links: LP38853 LP38853 www.ti.com SNVS335F – DECEMBER 2006 – REVISED NOVEMBER 2016 5 Pin Configuration and Functions KTW Package 7-Pin DDPAK/TO-263 Top TAB IS GND SS EN IN GND ADJ OUT BIAS 1 2 3 4 5 6 7 LP38853T 1 2 3 4 5 6 7 LP38853S SS EN IN GND ADJ OUT BIAS NDZ Package 7-Pin TO-220 Top View TAB IS GND DDA Package 8-Pin SO PowerPAD Top View ADJ 1 8 N/C OUT 2 7 IN BIAS 3 6 EN GND 4 5 SS DAP Connect to GND Pin Functions PIN NAME TYPE DESCRIPTION DDPAK/TO-263 TO-220 SO PowerPAD-8 ADJ 5 5 1 O The feedback connection to set the output voltage BIAS 7 7 3 I The supply for the internal control and reference circuitry. EN 2 2 6 I Device enable, High = On, Low = Off. DAP — — DAP — GND 4 4 4 GND IN 3 3 7 I N/C — — 8 — No internal connection OUT 6 6 2 O The regulated output voltage SS 1 1 5 O Soft-start capacitor connection. Used to control the rise time of VOUT at turnon. TAB TAB — — The KTW and NDZ TAB is a thermal and electrical connection that is physically attached to the backside of the die, and used as a thermal heat-sink connection. TAB The SO PowerPAD DAP is a thermal connection only that is physically attached to the backside of the die, and used as a thermal heat-sink connection. Ground The unregulated voltage input Submit Documentation Feedback Copyright © 2006–2016, Texas Instruments Incorporated Product Folder Links: LP38853 3 LP38853 SNVS335F – DECEMBER 2006 – REVISED NOVEMBER 2016 www.ti.com 6 Specifications 6.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) (1) (2) MIN MAX UNIT VIN supply voltage (survival) −0.3 6 V VBIAS supply voltage (survival) −0.3 6 V VSS soft-start voltage (survival) −0.3 6 V VOUT voltage (survival) −0.3 6 V IOUT current (survival) Internally Limited Junction temperature −40 Power dissipation (3) Internally Limited Storage temperature, Tstg −65 (1) (2) (3) 150 °C 150 °C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. If Military/Aerospace specified devices are required, contact the TI Sales Office/ Distributors for availability and specifications. Device power dissipation must be de-rated based on device power dissipation (PD), ambient temperature (TA), and package junction-toambient thermal resistance (RθJA). Additional heat sinking may be required to ensure that the device junction temperature (TJ) does not exceed the maximum operating rating. See the Application and Implementation section for details. 6.2 ESD Ratings V(ESD) (1) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) VALUE UNIT ±2000 V JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. 6.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) (1) MIN VIN supply voltage (survival) VBIAS supply voltage (survival) (2) 0.8 V ≤ VOUT ≤ 1.2 V 3 1.2 V < VOUT ≤ 1.8 V MAX UNIT (VOUT + VDO) to VBIAS V 5.5 V V 4.5 5.5 VEN voltage 0 VBIAS IOUT 0 3 mA −40 125 °C Junction temperature (3) (1) (2) (3) 4 V Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability VIN cannot exceed either VBIAS or 4.5 V, whichever value is lower. Device power dissipation must be de-rated based on device power dissipation (PD), ambient temperature (TA), and package junction to ambient thermal resistance (RθJA). Additional heat-sinking may be required to ensure that the device junction temperature (TJ) does not exceed the maximum operating rating. See the Application and Implementation section for details. Submit Documentation Feedback Copyright © 2006–2016, Texas Instruments Incorporated Product Folder Links: LP38853 LP38853 www.ti.com SNVS335F – DECEMBER 2006 – REVISED NOVEMBER 2016 6.4 Thermal Information LP38853 THERMAL METRIC (1) KTW (DDPAK/TO-263) NDZ (TO-220) DDA (SO PowerPAD) 7 PINS 7 PINS 8 PINS UNIT RθJA Junction-to-ambient thermal resistance 34.3 34.0 48.4 °C/W RθJC(top) Junction-to-case (top) thermal resistance 37.6 36.4 54.6 °C/W RθJB Junction-to-board thermal resistance 25.3 25.0 29.1 °C/W ψJT Junction-to-top characterization parameter 6.6 6.3 9.6 °C/W ψJB Junction-to-board characterization parameter 24.0 23.6 29.0 °C/W RθJC(bot) Junction-to-case (bottom) thermal resistance n/a n/a 4.3 °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953. 6.5 Electrical Characteristics Unless otherwise specified: VOUT = 0.8 V, VIN = VOUT(NOM) + 1 V, VBIAS = 3 V, VEN = VBIAS, IOUT = 10 mA, CIN = COUT = 10 µF, CBIAS = 1 µF, CSS = open; typical (TYP) limits are for TJ = 25°C only, and minimum (MIN) and maximum (MAX) limits apply over the junction temperature (TJ) range of –40°C to +125°C. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. PARAMETER VADJ VADJ accuracy MIN TYP MAX VOUT(NOM) + 1 V ≤ VIN ≤ VBIAS ≤ 4.5 V (1) 3 V ≤ VBIAS ≤ 5.5 V, 10 mA ≤ IOUT ≤ 3 A TJ = 25°C TEST CONDITIONS 492.5 500 507.5 VOUT(NOM) + 1 V ≤ VIN ≤ VBIAS ≤ 4.5 V (1) 3 V ≤ VBIAS ≤ 5.5 V, 10 mA ≤ IOUT ≤ 3 A 485 VOUT(NOM) + 1 V ≤ VIN ≤ VBIAS ≤ 4.5 V (1) 3 V ≤ VBIAS ≤ 5.5 V, 10 mA ≤ IOUT ≤ 3 A, 0°C ≤ TJ ≤ 125°C 490 3 V ≤ VBIAS ≤ 5.5 V 0.8 1.2 4.5 V ≤ VBIAS ≤ 5.5 V 0.8 1.8 515 500 UNIT mV 510 VOUT VOUT range ΔVOUT/ΔVIN Line regulation, VIN (2) VOUT(NOM) + 1 V ≤ VIN ≤ VBIAS 0.04 %/V ΔVOUT/ΔVBIAS Line regulation, VBIAS (2) 3 V ≤ VBIAS ≤ 5.5 V 0.1 %/V ΔVOUT/ΔIOUT Output voltage load regulation (3) 10 mA ≤ IOUT ≤ 3 A 0.2 %/A VDO Dropout voltage (4) IOUT = 3 A, TJ = 25°C 240 IOUT = 3 A VOUT = 0.8 V, VBIAS = 3 V 10 mA ≤ IOUT ≤ 3 A TJ = 25°C IGND(IN) Quiescent current drawn from VIN supply 450 7 IGND(BIAS) Quiescent current drawn from VBIAS supply 1 VEN ≤ 0.5 V (1) (2) (3) (4) 100 300 3 10 mA ≤ IOUT ≤ 3 A VEN ≤ 0.5 V, TJ = 25°C 8.5 9 VEN ≤ 0.5 V 10 mA ≤ IOUT ≤ 3 A, TJ = 25°C mV mA VOUT = 0.8 V, VBIAS = 3 V 10 mA ≤ IOUT ≤ 3 A VEN ≤ 0.5 V, TJ = 25°C 300 V 3.8 4.5 100 170 200 μA mA μA VIN cannot exceed either VBIAS or 4.5 V, whichever value is lower. Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage. Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from no load to full load. Dropout voltage is defined as the input to output voltage differential (VIN – VOUT) where the input voltage is low enough to cause the output voltage to drop 2% from the nominal value. Submit Documentation Feedback Copyright © 2006–2016, Texas Instruments Incorporated Product Folder Links: LP38853 5 LP38853 SNVS335F – DECEMBER 2006 – REVISED NOVEMBER 2016 www.ti.com Electrical Characteristics (continued) Unless otherwise specified: VOUT = 0.8 V, VIN = VOUT(NOM) + 1 V, VBIAS = 3 V, VEN = VBIAS, IOUT = 10 mA, CIN = COUT = 10 µF, CBIAS = 1 µF, CSS = open; typical (TYP) limits are for TJ = 25°C only, and minimum (MIN) and maximum (MAX) limits apply over the junction temperature (TJ) range of –40°C to +125°C. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. PARAMETER Undervoltage lockout threshold UVLO Undervoltage lockout hysteresis UVLO(HYS) ISC Output short-circuit current TEST CONDITIONS VBIAS rising until device is functional, TJ = 25°C VBIAS rising until device is functional MIN TYP MAX 2.2 2.45 2.7 2 VBIAS falling from UVLO threshold until device is non-functional TJ = 25°C 60 VBIAS falling from UVLO threshold until device is non-functional 50 UNIT V 2.9 150 300 mV VIN = VOUT(NOM) + 1 V, VBIAS = 3 V, VOUT = 0V 350 5.8 A SOFT-START rSS Soft-start internal resistance tSS Soft-start time tSS = CSS × rSS × 5 11 CSS = 10 nF 13.5 16 675 kΩ μs ENABLE VEN = VBIAS IEN ENABLE pin current VEN(ON) Enable voltage threshold VEN(HYS) Enable voltage hysteresis 0.01 VEN = 0 V, VBIAS = 5.5 V, TJ = 25°C –19 VEN = 0 V, VBIAS = 5.5 V –13 VEN rising until output = ON, TJ = 25°C 1 VEN rising until output = ON 0.9 VEN falling from VEN(ON) until Output = OFF TJ = 25°C 50 VEN falling from VEN(ON) until Output = OFF 30 –30 –40 μA –51 1.25 1.5 1.55 100 150 V mV 200 AC PARAMETERS PSRR (VIN) Ripple rejection for VIN input voltage PSRR (VBIAS) Ripple rejection for VBIAS voltage Output noise density en Output noise voltage VIN = VOUT(NOM) + 1 V, ƒ = 120 Hz 80 VIN = VOUT(NOM) + 1 V, ƒ = 1 kHz 70 VBIAS = VOUT(NOM) + 3 V, ƒ= 120 Hz 58 VBIAS = VOUT(NOM) + 3 V, ƒ = 1 kHz 58 dB ƒ = 120 Hz 1 BW = 10 Hz − 100 kHz 150 BW = 300 Hz − 300 kHz 90 µV/√Hz µVRMS THERMAL PARAMETERS TSD Thermal shutdown junction temperature TSD(HYS) Thermal shutdown hysteresis 160 °C 10 6.6 Timing Requirements MIN NOM MAX UNIT tOFF Turnoff delay time, RLOAD x COUT