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LM2597, LM2597HV

www.ti.com

SNVS119C –MARCH 1998–REVISED APRIL 2013

LM2597/LM2597HV SIMPLE SWITCHER

Power Converter 150 kHz 0.5A Step-Down

Voltage Regulator, with Features

Check for Samples: LM2597, LM2597HV

FEATURES

DESCRIPTION

The LM2597/LM2597HV series of regulators are

• 3.3V, 5V, 12V, and Adjustable Output Versions

monolithic integrated circuits that provide all the

• Adjustable Version Output Voltage Range,

active functions for a step-down (buck) switching

1.2V to 37V (57V for HV Version)±4% Max Over

regulator, capable of driving a 0.5A load with

Line and Load Conditions

excellent line and load regulation. These devices are

available in fixed output voltages of 3.3V, 5V, 12V,

• Specified 0.5A Output Current

and an adjustable output version, and are packaged

• Available in 8-pin Surface Mount and PDIP-8

in an 8-lead PDIP and an 8-lead surface mount

Package

package.

• Input Voltage Range Up to 60V

This series of switching regulators is similar to the

• 150 kHz Fixed Frequency Internal Oscillator

LM2594 series, with additional supervisory and

• Shutdown /Soft-start

performance features added.

• Out of Regulation Error Flag

Requiring a minimum number of external

• Error Output Delay

components, these regulators are simple to use and

include internal frequency compensation†, improved

• Bias Supply Pin (V

) for Internal Circuitry

line and load specifications, fixed-frequency oscillator,

Improves Efficiency at High Input Voltages

Shutdown /Soft-start, error flag delay and error flag

• Low Power Standby Mode, I

Typically 85 μA

output.

• High Efficiency

The LM2597/LM2597HV series operates at a

• Uses Readily Available Standard Inductors

switching frequency of 150 kHz thus allowing smaller

• Thermal Shutdown and Current Limit sized filter components than what would be needed

with lower frequency switching regulators. Because of

Protection

its high efficiency, the copper traces on the printed

circuit board are normally the only heat sinking

APPLICATIONS

needed.

• Simple High-efficiency Step-down (Buck)

A standard series of inductors (both through hole and

Regulator

surface mount types) are available from several

• Efficient Pre-regulator for Linear Regulators

different manufacturers optimized for use with the

• On-card Switching Regulators

LM2597/LM2597HV series. This feature greatly

simplifies the design of switch-mode power supplies.

• Positive to Negative Converter

Other features include a specified ±4% tolerance on

output voltage under all conditions of input voltage

and output load conditions, and ±15% on the

oscillator frequency. External shutdown is included,

featuring typically 85 μA standby current. Self

protection features include a two stage current limit

for the output switch and an over temperature

shutdown for complete protection under fault

conditions.

The LM2597HV is for use in applications requiring

and input voltage up to 60V.

†Patent Number 5,382,918.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2SIMPLE SWITCHER, Switchers Made Simple are registered trademarks of Texas Instruments.

3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (48 pages)

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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 LM2597/LM2597HV SIMPLE SWITCHER® Power Converter 150 kHz 0.5A Step-Down Voltage Regulator, with Features Check for Samples: LM2597, LM2597HV FEATURES DESCRIPTION • • The LM2597/LM2597HV series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com Typical Application (Fixed Output Voltage Versions) Figure 1. Connection Diagrams Figure 2. 8–Lead PDIP (P) Top View See Package Number P0008E 2 Submit Documentation Feedback Figure 3.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings Maximum Supply Voltage (VIN) (1) (2) (3) LM2597 45V LM2597HV 60V SD /SS Pin Input Voltage Delay Pin Voltage (4) 6V (4) 1.5V −0.3 ≤ V ≤45V Flag Pin Voltage −0.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com LM2597/LM2597HV-3.3 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range.VINmax=40V for the LM2597 and 60V for the LM2597HV Symbol Parameter Conditions LM2597/LM2597HV-3.3 (1) Typ Limit (2) Units (Limits) SYSTEM PARAMETERS Test Circuit Figure 31 (3) (4) VOUT Output Voltage η Efficiency (1) (2) (3) (4) 4.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 LM2597/LM2597HV-12 Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range.VINmax=40V for the LM2597 and 60V for the LM2597HV Symbol Parameter Conditions LM2597/LM2597HV-12 Typ (1) Limit Units (Limits) (2) SYSTEM PARAMETERS Test Circuit Figure 31 (3) (4) VOUT η (1) (2) (3) (4) 15V ≤ VIN ≤ VINmax, 0.1A ≤ ILOAD ≤ 0.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com All Output Voltage Versions Electrical Characteristics Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable version and VIN = 24V for the 12V version. ILOAD = 100 mA.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 All Output Voltage Versions Electrical Characteristics (continued) Specifications with standard type face are for TJ = 25°C, and those with boldface type apply over full Operating Temperature Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable version and VIN = 24V for the 12V version. ILOAD = 100 mA.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics 8 Normalized Output Voltage Line Regulation Figure 4. Figure 5. Efficiency Switch Saturation Voltage Figure 6. Figure 7. Switch Current Limit Dropout Voltage Figure 8. Figure 9.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Quiescent Current Standby Quiescent Current Figure 10. Figure 11. Minimum Operating Supply Voltage Feedback Pin Bias Current Figure 12. Figure 13. Flag Saturation Voltage Switching Frequency Figure 14. Figure 15.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 10 Soft-start Shutdown /Soft-start Current Figure 16. Figure 17. Delay Pin Current VIN and VBS Current vs VBS and Temperature Figure 18. Figure 19. Soft-start Response Shutdown /Soft-start Threshold Voltage Figure 20. Figure 21.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Continuous Mode Switching Waveforms VIN = 20V, VOUT = 5V, ILOAD = 400 mA L = 100 μH, COUT = 120 μF, COUT ESR = 140 mΩ A: Output Pin Voltage, 10V/div. B: Inductor Current 0.2A/div. C: Output Ripple Voltage, 20 mV/div. Figure 22. Horizontal Time Base: 2 μs/div.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com LM2597/LM2597HV Series Buck Regulator Design Procedure (Fixed Output) PROCEDURE (Fixed Output Voltage Version) EXAMPLE (Fixed Output Voltage Version) Given: VOUT = Regulated Output Voltage (3.3V, 5V or 12V) VIN(max) = Maximum DC Input Voltage ILOAD(max) = Maximum Load Current Given: VOUT = 5V VIN(max) = 12V ILOAD(max) = 0.4A 1. Inductor Selection (L1) A.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 PROCEDURE (Fixed Output Voltage Version) EXAMPLE (Fixed Output Voltage Version) 3. Catch Diode Selection (D1) A. The catch diode current rating must be at least 1.3 times greater than the maximum load current. Also, if the power supply design must withstand a continuous output short, the diode should have a current rating equal to the maximum current limit of the LM2597.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com Table 1. LM2597/LM2597HV Fixed Voltage Quick Design Component Selection Table (continued) Conditions Inductor Output Capacitor Through Hole Voltage Output (V) Current Load (A) 0.5 5 0.2 0.5 12 0.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 PROCEDURE (Adjustable Output Voltage Version) EXAMPLE (Adjustable Output Voltage Version) 2. Inductor Selection (L1) 2. Inductor Selection (L1) A. Calculate the inductor Volt microsecond constant E • T (V • μs), A. Calculate the inductor Volt • microsecond constant (E • T), from the following formula: where B. E • T = 35.2 (V • μs) C. ILOAD(max) = 0.5A D.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com PROCEDURE (Adjustable Output Voltage Version) EXAMPLE (Adjustable Output Voltage Version) 5. Catch Diode Selection (D1) A. The catch diode current rating must be at least 1.3 times greater than the maximum load current. Also, if the power supply design must withstand a continuous output short, the diode should have a current rating equal to the maximum current limit of the LM2597.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 LM2597/LM2597HV Series Buck Regulator Design Procedure INDUCTOR VALUE SELECTION GUIDES (For Continuous Mode Operation) Figure 26. LM2597/LM2597HV-3.3 Figure 27. LM2597/LM2597HV-5.0 Figure 28. LM2597/LM2597HV-12 Figure 29.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com (For Continuous Mode Operation) Table 3. Inductor Manufacturers' Part Numbers Inductance (μH) Current (A) Schott Through Hole Renco Surface Mount Through Hole Pulse Engineering Surface Mount Through Hole Coilcraft Surface Mount Surface Mount L1 220 0.18 67143910 67144280 RL-5470-3 RL1500-220 PE-53801 PE-53801-S DO1608-224 L2 150 0.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 Table 5. Capacitor Manufacturers' Phone Numbers Nichicon Corp. Panasonic AVX Corp. Sprague/Vishay Phone (708) 843-7500 FAX (708) 843-2798 Phone (714) 373-7857 FAX (714) 373-7102 Phone (803) 448-9411 FAX (803) 448-1943 Phone (207) 324-7223 FAX (207) 324-4140 Table 6. Diode Selection Table 1A Diodes Surface Mount VR Schottky Ultra Fast Recovery All of these diodes are rated to at least 60V.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com Block Diagram Typical Circuit and Layout Guidelines Component Values shown are for VIN = 15V, VOUT = 5V, ILOAD = 500 mA. CIN — 47 μF, 50V, Aluminum Electrolytic Nichicon “PL Series” COUT — 120 μF, 25V Aluminum Electrolytic, Nichicon “PL Series” D1 — 1A, 30V Schottky Rectifier, 1N5818 L1 — 100 μH, L20 Typical Values CSS — 0.1 μF CDELAY — 0.1 μF RPull Up — 4.7k *Use Bias Supply pin for 5V and 12V Versions Figure 30.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 Select R1 to be approximately 1 kΩ, use a 1% resistor for best stability. Component Values shown are for VIN = 20V, VOUT = 10V, ILOAD = 500 mA. CIN — 68 μF, 35V, Aluminum Electrolytic Nichicon “PL Series” COUT — 120 μF, 25V Aluminum Electrolytic, Nichicon “PL Series” D1 — 1A, 30V Schottky Rectifier, 1N5818 L1 — 150 μH, L19 R1 — 1 kΩ, 1% R2 — 7.15k, 1% CFF — 3.3 nF, See Application Information Typical Values CSS — 0.1 μF CDELAY — 0.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com APPLICATION INFORMATION PIN FUNCTIONS +VIN (Pin 7) This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. Ground (Pin 6) Circuit ground Output (Pin 8) Internal switch The voltage at this pin switches between (+VIN − VSAT) and approximately −0.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 NOTE The lower curve shown in Figure 32 shows the Soft-start region from 0% to 100%. This is not the duty cycle percentage, but the output voltage percentage. Also, the Soft-start voltage range has a negative temperature coefficient associated with it. See the Soft-start curve in Electrical Characteristics. 4. Normal operation. Above 2.8V, the circuit operates as a standard Pulse Width Modulated switching regulator.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com Figure 33. Timing Diagram for 5V Output VIN LM2597 5 Q1 SD/SS CSS Z1 3V Figure 34. External 3.7V Soft-Start Clamp DELAY CAPACITOR CDELAY —Provides delay for the error flag output. See the upper curve in Figure 32, and also refer to timing diagrams in Figure 33.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 INPUT CAPACITOR CIN —A low ESR aluminum or tantalum bypass capacitor is needed between the input pin and ground pin. It must be located near the regulator using short leads. This capacitor prevents large voltage transients from appearing at the input, and provides the instantaneous current needed each time the switch turns on. The important parameters for the Input capacitor are the voltage rating and the RMS current rating.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com Because of their small size and excellent performance, surface mount solid tantalum capacitors are often used for input bypassing, but several precautions must be observed. A small percentage of solid tantalum capacitors can short if the inrush current rating is exceeded. This can happen at turn on when the input voltage is suddenly applied, and of course, higher input voltages produce higher inrush currents.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 Figure 37. Capacitor ESR Change vs Temperature INDUCTOR SELECTION All switching regulators have two basic modes of operation; continuous and discontinuous. The difference between the two types relates to the inductor current, whether it is flowing continuously, or if it drops to zero for a period of time in the normal switching cycle.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com When operating in the continuous mode, the inductor current waveform ranges from a triangular to a sawtooth type of waveform (depending on the input voltage), with the average value of this current waveform equal to the DC output load current. Inductors are available in different styles such as pot core, toroid, E-core, bobbin core, etc., as well as different core materials, such as ferrites and powdered iron.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 Figure 39. Post Ripple Filter Waveform OUTPUT VOLTAGE RIPPLE AND TRANSIENTS The output voltage of a switching power supply operating in the continuous mode will contain a sawtooth ripple voltage at the switcher frequency, and may also contain short voltage spikes at the peaks of the sawtooth waveform. The output ripple voltage is a function of the inductor sawtooth ripple current and the ESR of the output capacitor.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com Figure 40. Peak-to-Peak Inductor Ripple Current vs Load Current When a switching regulator is operating in the continuous mode, the inductor current waveform ranges from a triangular to a sawtooth type of waveform (depending on the input voltage). For a given input and output voltage, the peak-to-peak amplitude of this inductor current waveform remains constant.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 Once the ΔIIND value is known, the following formulas can be used to calculate additional information about the switching regulator circuit. 1. Peak Inductor or peak switch current (1) 2. Minimum load current before the circuit becomes discontinuous (2) 3. Output Ripple Voltage = (ΔIIND)×(ESR of COUT) = 0.150A×0.240Ω=36 mV p-p 4.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com Figure 41. Junction Temperature Rise, PDIP-8 Circuit Data for Temperature Rise Curve (PDIP-8) Capacitors Through hole electrolytic Inductor Through hole, Schott, 100 μH Diode Through hole, 1A 40V, Schottky PC board 4 square inches single sided 2 oz. copper (0.0028″) Figure 42.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 THERMAL CONSIDERATIONS The LM2597/LM2597HV is available in two packages, an 8-pin through hole PDIP (P) and an 8-pin surface mount SOIC-8 (D). Both packages are molded plastic with a copper lead frame. When the package is soldered to the PC board, the copper and the board are the heat sink for the LM2597 and the other heat producing components. For best thermal performance, wide copper traces should be used.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com Figure 43. Effects of Bias Supply Feature on 5V Regulator Efficiency Figure 44. Effects of Bias Supply Feature on 12V Regulator Efficiency SHUTDOWN /SOFT-START The circuit shown in Figure 47 is a standard buck regulator with 24V in, 12V out, 100 mA load, and using a 0.068 μF Soft-start capacitor.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 Figure 47. Typical Circuit Using Shutdown /Soft-start and Error Flag Features Figure 48. Inverting −5V Regulator With Shutdown and Soft-start lNVERTING REGULATOR The circuit in Figure 48 converts a positive input voltage to a negative output voltage with a common ground.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com Figure 49. Maximum Load Current for Inverting Regulator Circuit An additional diode is required in this regulator configuration. Diode D1 is used to isolate input voltage ripple or noise from coupling through the CIN capacitor to the output, under light or no load conditions. Also, this diode isolation changes the topology to closely resemble a buck configuration thus providing good closed loop stability.
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LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 Figure 50. Undervoltage Lockout for a Buck Regulator Figure 51 and Figure 52 apply the same feature to an inverting circuit. Figure 51 features a constant threshold voltage for turn on and turn off (zener voltage plus approximately one volt). If hysteresis is needed, the circuit in Figure 52 has a turn ON voltage which is different than the turn OFF voltage.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com Figure 53.
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LM2597, LM2597HV www.ti.
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LM2597, LM2597HV SNVS119C – MARCH 1998 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision B (April 2013) to Revision C • 40 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 25-Feb-2014 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2597HVM-12/NOPB ACTIVE SOIC D 8 95 Green (RoHS & no Sb/Br) SN | CU SN Level-1-260C-UNLIM -40 to 125 2597H M-12 LM2597HVM-3.3/NOPB ACTIVE SOIC D 8 95 Green (RoHS & no Sb/Br) SN | CU SN Level-1-260C-UNLIM -40 to 125 2597H M-3.3 LM2597HVM-5.
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PACKAGE OPTION ADDENDUM www.ti.com 25-Feb-2014 Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2597M-5.0/NOPB ACTIVE SOIC D 8 95 Green (RoHS & no Sb/Br) SN | CU SN Level-1-260C-UNLIM 2597 M-5.
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PACKAGE OPTION ADDENDUM www.ti.com 25-Feb-2014 Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM2597HVMX-12/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LM2597HVMX-3.3/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LM2597HVMX-5.0/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 11-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2597HVMX-12/NOPB SOIC D 8 2500 367.0 367.0 35.0 LM2597HVMX-3.3/NOPB SOIC D 8 2500 367.0 367.0 35.0 LM2597HVMX-5.0/NOPB SOIC D 8 2500 367.0 367.0 35.0 LM2597HVMX-ADJ/NOPB SOIC D 8 2500 367.0 367.0 35.0 LM2597MX-12/NOPB SOIC D 8 2500 367.0 367.0 35.0 LM2597MX-3.3 SOIC D 8 2500 367.0 367.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.