LM2597

現行

SIMPLE SWITCHER 電源轉換器 150 kHz 0.5A 降壓電壓穩壓器

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產品規格表

document-pdfAcrobat LM2597, LM2597HV SIMPLE SWITCHER® Power Converter 150-kHz 0.5-A Step-Down Voltage Regulator With Features datasheet (Rev. D) (英文) PDF | HTML

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LMR54406

現行

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LM2597

現行

產品規格表

立即訂購

產品詳細資料

Rating

Catalog

Topology

Buck

Iout (max) (A)

0.5

Vin (max) (V)

40

Vin (min) (V)

4.5

Vout (max) (V)

37

Vout (min) (V)

3.3

Features

Overcurrent protection, Power good

Control mode

Voltage mode

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.005

Duty cycle (max) (%)

100

Rating

Catalog

Topology

Buck

Iout (max) (A)

0.5

Vin (max) (V)

40

Vin (min) (V)

4.5

Vout (max) (V)

37

Vout (min) (V)

3.3

Features

Overcurrent protection, Power good

Control mode

Voltage mode

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.005

Duty cycle (max) (%)

100

SOIC (D)

8

29.4 mm² (4.9 mm × 6 mm)

PDIP (P)

8

92.5083 mm² (9.81 mm × 9.43 mm)

3.3-V, 5-V, 12-V, and Adjustable Output Versions
Adjustable Version Output Voltage Range: 1.2 V
to 37 V (57 V for HV Version) ±4% Maximum Over
Line and Load Conditions
Specified 0.5-A Output Current
Available in 8-Pin Surface-Mount and 8-Pin PDIP
Packages
Input Voltage Range Up to 60 V
150-kHz Fixed-Frequency Internal Oscillator
Shutdown/Soft-Start
Out of Regulation Error Flag
Error Output Delay
Bias Supply Pin (V_BS) for Internal Circuitry
Improves Efficiency at High Input Voltages
Low Power Standby Mode, I_Q, Typically 85 µA
High Efficiency
Uses Readily Available Standard Inductors
Thermal Shutdown and Current-Limit Protection

3.3-V, 5-V, 12-V, and Adjustable Output Versions
Adjustable Version Output Voltage Range: 1.2 V
to 37 V (57 V for HV Version) ±4% Maximum Over
Line and Load Conditions
Specified 0.5-A Output Current
Available in 8-Pin Surface-Mount and 8-Pin PDIP
Packages
Input Voltage Range Up to 60 V
150-kHz Fixed-Frequency Internal Oscillator
Shutdown/Soft-Start
Out of Regulation Error Flag
Error Output Delay
Bias Supply Pin (V_BS) for Internal Circuitry
Improves Efficiency at High Input Voltages
Low Power Standby Mode, I_Q, Typically 85 µA
High Efficiency
Uses Readily Available Standard Inductors
Thermal Shutdown and Current-Limit Protection

The LM2597xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version, and are packaged in an 8-pin PDIP and an 8-pin surface-mount package.

This series of switching regulators is similar to the LM2594 series, with additional supervisory and performance features added.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, improved line and load specifications, fixed-frequency oscillator, Shutdown/Soft-start, error flag delay, and error flag output.

The LM2597xx series operates at a switching frequency of 150-kHz, thus allowing smaller-sized filter components than what would be required with lower-frequency switching regulators. Because of its high efficiency, the copper traces on the printed-circuit board are normally the only heat sinking required.

A standard series of inductors (both through-hole and surface-mount types) are available from several different manufacturers optimized for use with the LM2597xx series. This feature greatly simplifies the design of switch-mode power supplies.

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 overtemperature shutdown for complete protection under fault conditions.

The LM2597HV is for use in applications requiring and input voltage up to 60 V.

The LM2597xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version, and are packaged in an 8-pin PDIP and an 8-pin surface-mount package.

This series of switching regulators is similar to the LM2594 series, with additional supervisory and performance features added.

Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, improved line and load specifications, fixed-frequency oscillator, Shutdown/Soft-start, error flag delay, and error flag output.

The LM2597xx series operates at a switching frequency of 150-kHz, thus allowing smaller-sized filter components than what would be required with lower-frequency switching regulators. Because of its high efficiency, the copper traces on the printed-circuit board are normally the only heat sinking required.

A standard series of inductors (both through-hole and surface-mount types) are available from several different manufacturers optimized for use with the LM2597xx series. This feature greatly simplifies the design of switch-mode power supplies.

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 overtemperature shutdown for complete protection under fault conditions.

The LM2597HV is for use in applications requiring and input voltage up to 60 V.

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