Datasheet LM317 (Texas Instruments) - 8

link to page 8 link to page 8 link to page 8 link to page 8 link to page 8 link to page 8 link to page 8 link to page 8 link to page 8 link to page 8 link to page 8
LM317
SLVS044Z – SEPTEMBER 1997 – REVISED APRIL 2025
www.ti.com 6.6 Electrical Characteristics
some specifications apply over the full operating temperature range as noted; unless otherwise specified, TJ = 25°C, VIN − VOUT = 5V, and IOUT = 10mA(1)
PARAMETER TEST CONDITIONS
(1)
MIN TYP MAX UNIT
TJ = 25°C 1.25 Reference voltage V 3V ≤ (VIN − VOUT) ≤ 40V, 1.2 1.25 1.3 10mA ≤ IOUT ≤ 1500mA, PD ≤ 20W TJ = 25°C 0.01 0.04 Line regulation(2) 3V ≤ (VIN − VOUT) ≤ 40V(4) %/V (over full operating 0.02 0.07 temperature range) IO = 10mA to VO ≤ 5V 25 mV 1500mA, CADJ = 10μF(3), TJ = VO ≥ 5V 0.1 0.5 %VO Legacy chip 25°C IO = 10mA to VO ≤ 5V 20 70 mV Load regulation 1500mA, TJ = 0°C to 125°C VO ≥ 5V 0.3 1.5 TJ = 25°C 0.1 0.5 %VO 10mA ≤ I New chip OUT ≤ I (over full operating MAX (5) 0.3 1.5 temperature range) Thermal regulation 20ms pulse 0.04 0.07 %/W Adjustment pin current Over full operating temperature range 50 100 μA 10mA ≤ I Over full operating Adjustment pin current change OUT ≤ IMAX (4) 0.2 5 μA 3V ≤ (VIN − VOUT) ≤ 40V temperature range Legacy chip Over full operating 0.7 Temperature stability TMIN ≤ TJ ≤ TMAX %V temperature range O New chip 1% Over full operating Minimum load current (VIN − VOUT) = 40V 3.5 10 mA temperature range (VIN − VOUT) ≤ 15V  PD < PMAX (3) 1.5 2.2 Current limit A (VIN − VOUT) = 40V PD < PMAX (3), TJ = 25°C 0.15 0.4 RMS output noise, % of VOUT 10Hz ≤ f ≤ 10kHz 0.003 % VOUT = 10V, f = 120Hz, CADJ = 0μF(4) 57 Legacy chip VOUT = 10V, f = 120Hz, CADJ = 10μF(4) 62 64 Ripple rejection ratio VOUT = 10V, f = 120Hz, CADJ = 0μF (over full dB 65 operating temperature range) New chip VOUT = 10V, f = 120Hz, CADJ = 10μF (over 66 80 full operating temperature range) Long-term stability TJ = 25°C 0.3 1 %/1k hr (1) For the legacy chip (unless otherwise noted), the following test conditions apply: |VI – VO| = 5V, IOMAX = 1.5A, and TJ = 0°C to 125°C. Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible. (2) For the legacy chip, line regulation is expressed as the percentage change in output voltage per 1V change at the input. (3) For the legacy chip, maximum power dissipation is a function of TJ(max), RθJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA) / RθJA. Operating at the absolute maximum TJ of 150°C potentially affects reliability. (4) For the legacy chip, CADJ is connected between the ADJUST pin and GND. (5) For the new chip, regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage resulting from heating effects are covered under the specifications for thermal regulation. 8 Submit Document Feedback Copyright © 2025 Texas Instruments Incorporated Product Folder Links: LM317 Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Device Comparison Table 5 Pin Configuration and Functions 6 Specifications 6.1 Absolute Maximum Ratings 6.2 ESD Ratings 6.3 Recommended Operating Conditions 6.4 Thermal Information (Legacy Chip) 6.5 Thermal Information (New Chip) 6.6 Electrical Characteristics 6.7 Typical Characteristics 7 Detailed Description 7.1 Overview 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 NPN Darlington Output Drive 7.3.2 Overload Block 7.3.3 Programmable Feedback 7.4 Device Functional Modes 7.4.1 Normal Operation 7.4.2 Operation With Low Input Voltage 7.4.3 Operation at Light Loads 7.4.4 Operation In Self Protection 8 Application and Implementation 8.1 Application Information 8.2 Typical Application 8.2.1 Design Requirements 8.2.2 Detailed Design Procedure 8.2.3 Application Curves 8.3 System Examples 8.3.1 0V to 30V Regulator Circuit 8.3.2 Adjustable Regulator Circuit With Improved Ripple Rejection 8.3.3 Precision Current-Limiter Circuit 8.3.4 Tracking Preregulator Circuit 8.3.5 1.25V to 20V Regulator Circuit With Minimum Program Current 8.3.6 Battery-Charger Circuit 8.3.7 50mA, Constant-Current, Battery-Charger Circuit 8.3.8 Slow Turn-On 15V Regulator Circuit 8.3.9 AC Voltage-Regulator Circuit 8.3.10 Current-Limited 6V Charger Circuit 8.3.11 Adjustable 4A Regulator Circuit 8.3.12 High-Current Adjustable Regulator Circuit 8.4 Power Supply Recommendations 8.5 Layout 8.5.1 Layout Guidelines 8.5.1.1 Thermal Considerations 8.5.1.1.1 Heat Sink Requirements 8.5.1.1.2 Heat Sinking Surface-Mount Packages 8.5.1.1.2.1 Heatsinking the SOT-223 (DCY) Package 8.5.1.1.2.2 Heat Sinking the TO-263 (KTT) Package 8.5.2 Layout Examples 9 Device and Documentation Support 9.1 Device Support 9.1.1 Device Nomenclature 9.2 Receiving Notification of Documentation Updates 9.3 Support Resources 9.4 Trademarks 9.5 Electrostatic Discharge Caution 9.6 Glossary 10 Revision History 11 Mechanical, Packaging, and Orderable Information