Texas Instruments LM2597HVM-5.0/NOPB

Overview

LM2597HVM-5.0/NOPB from Texas Instruments is a monolithic 150-kHz nonsynchronous step-down DC-DC converter delivering 0.5-A output at fixed 5.0 V, supporting input voltages up to 60 V, with ±4% output voltage tolerance over line/load/temperature, integrated soft-start/shutdown, and error flag for power-up reset in industrial power supplies.

For engineers reviewing the LM2597HVM-5.0/NOPB datasheet, LM2597HVM-5.0/NOPB pinout, LM2597HVM-5.0/NOPB application, or LM2597HVM-5.0/NOPB equivalent, key selection criteria include HV input capability (60 V max), bias supply (VBS) efficiency optimization, thermal performance (R_θJA = 95°C/W in SOIC), and error flag delay timing for microprocessor reset sequencing.

Technical Context

The LM2597HVM-5.0/NOPB implements a fixed-frequency (150 kHz) current-mode buck topology with internal compensation, enabling stable operation with standard off-the-shelf inductors. Its nonsynchronous design uses an internal NPN switch with 1.1-V saturation voltage at 0.5-A load, requiring an external catch diode.

It integrates supervisory functions: open-collector error flag activated when output drops >5% below nominal, programmable delay via capacitor on Delay pin, and dual-function Shutdown/Soft-Start pin supporting logic-level disable (85 μA standby) and controlled output ramp-up. The Bias Supply (VBS) pin enables powering internal circuitry from V_OUT, improving efficiency at high VIN/low VOUT conditions.

Key Specifications

Pinout & Package

LM2597HVM-5.0/NOPB is packaged in an 8-pin SOIC (4.90 mm × 3.91 mm body) with exposed pad for thermal enhancement per TI's M-DSO-008A package drawing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with LM2597HVM-5.0/NOPB, LM2596-5.0 lacks HV input and bias supply capability but offers identical pinout and simplicity; TPS54302DDCR delivers superior efficiency and current but demands more complex layout and compensation tuning - making LM2597HVM-5.0/NOPB optimal for rugged, medium-power, cost-sensitive HV buck applications.

Availability

LM2597HVM-5.0/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, and programmable logic controller I/O power requiring stable component supply across extended product lifecycles.

Supply support for LM2597HVM-5.0/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.

The LM2597HV series was engineered as a robust, easy-to-use SIMPLE SWITCHER® buck regulator family targeting high-input-voltage applications where reliability, minimal external components, and supervisory features (error flag, soft-start) are critical - not just raw efficiency.

FAQ

What is the maximum input voltage rating for LM2597HVM-5.0/NOPB?

The LM2597HVM-5.0/NOPB has an absolute maximum input voltage rating of 60 V, confirmed in Section 7.1 Absolute Maximum Ratings of the TI datasheet SNVS119D. This HV rating distinguishes it from the standard LM2597 (45 V max) and enables direct regulation from 48-V systems and automotive load-dump transients. Operation above 40 V requires verification of thermal limits using R_θJA = 95°C/W.

Does LM2597HVM-5.0/NOPB require external feedback resistors?

No, LM2597HVM-5.0/NOPB does not require external feedback resistors. As a fixed 5.0-V output variant, its feedback network is fully internal - pin 4 (Feedback) is unused and must remain unconnected. This eliminates resistor tolerance errors and layout sensitivity, simplifying design versus adjustable versions like LM2597-ADJ.

How does the Bias Supply (VBS) pin improve efficiency in LM2597HVM-5.0/NOPB?

The VBS pin on LM2597HVM-5.0/NOPB allows internal circuitry to be powered from the regulated 5-V output instead of the high input voltage, reducing VIN current draw by ~4 mA. Per TI Figure 19, this improves light-load efficiency by up to 5% at high VIN/low VOUT conditions - particularly valuable in battery-powered or thermally constrained applications.

Can LM2597HVM-5.0/NOPB be used in inverting (positive-to-negative) configurations?

Yes, LM2597HVM-5.0/NOPB can be configured as a positive-to-negative inverter, as documented in Section 8.3.3 and Figure 24 of the datasheet. It generates −5 V from a positive input, with maximum output current dependent on input/output voltage ratio. Critical constraints include limiting total voltage across the IC to ≤60 V and adding an isolation diode (e.g., Schottky) to maintain stability.

What protection features are integrated into LM2597HVM-5.0/NOPB?

LM2597HVM-5.0/NOPB integrates thermal shutdown, two-stage current limiting (0.8-A peak), and undervoltage lockout. It also provides fault signaling via the open-collector Error Flag pin, which asserts low during output dropout. These protections operate autonomously without external components, ensuring robust operation during overload, short-circuit, or input brownout events.