LM2591HVS-ADJ

LM2591HVS-ADJ is TI’s high‑voltage, adjustable buck (step‑down) regulator. Key points:
- Wide input range: up to 60 V (HV version), with a 3 A internal switch.
- Adjustable output: Vout set by external feedback divider, typically ~1.23 V to ~37 V (Vout ≈ Vref(1+R2/R1)).
- Fixed switching frequency: about 52–60 kHz (simple, easy to design around).
- External components required: inductor, Schottky catch diode, input/output capacitors, and feedback resistors to set Vout.
- Protections: overcurrent (current limit) and thermal shutdown.
- Efficiency: high (varies with input/output conditions; typically strong in a buck design).
- Applications: automotive, industrial, and battery-powered systems needing a compact, simple buck regulator.
Pins usually include VIN, GND, SW (switch output), FB (feedback), and in some packages an enable/shutdown option. The HV variant allows convenient stepping down from higher automotive or battery voltages.

Direct equivalents: LM2591HVS-ADJ is TI’s high‑voltage 60V, 3A buck regulator; the closest direct cross is LM2591HV-ADJ (same device family).
Other brands with similar specs (not drop‑in pin equivalents): LM2576-ADJ (40V max), MP1584EN (≈40V), and controller-based parts like LTC3780/LTC3870 (60–100V input).
Note: check pinout, compensation networks, and external components when substituting.

Key features of LM2591HVS-ADJ (high‑voltage, adjustable version):
- 60V input range (high-voltage version).
- 1 A switch current capability with integrated high-side switch (buck regulator).
- Adjustable output: 1.23 V to 37 V using external resistor divider (Vout = 1.23 × (1 + R2/R1)).
- Fixed-frequency operation ≈ 55 kHz switch frequency (PWM control).
- Current-mode control with cycle-by-cycle current limit.
- Built-in protection: current limit and thermal shutdown; UVLO on input.
- ON/OFF control pin to enable/disable device.
- High efficiency suitable for automotive/battery apps; simple, compact BOM.
- Packages: TO-220 or similar through-hole/SMD variants.
Notes: External feedback network sets the output; designed for easy buck conversion with minimal external parts.

LM2591HVS-ADJ is a high‑voltage, adjustable 1 A switching regulator in a 5‑pin package (TO‑220/TO‑263).
Pins and functions:
- VIN: input supply (up to 60 V max).
- GND: ground reference.
- OUTPUT (SW): switching node connected to the inductor and catch diode.
- FB: feedback input used with an external resistor divider to set the output voltage (Vref ~1.23 V).
- ON/OFF: enable/shutdown control (activates/deactivates the regulator).
Note: external components are required (inductor, Schottky diode, output capacitor) to complete the buck converter.

- Manufacturer: Texas Instruments (TI).
- What kind of company: An American multinational semiconductor company that designs and manufactures analog and mixed-signal ICs, embedded processors, and related semiconductor products; one of the world’s largest chipmakers.

LM2591HVS-ADJ is a high-voltage adjustable buck regulator (input up to 60 V, 3 A). Typical applications include:
- Automotive DC-DC converters (12–60 V battery/alternator systems)
- Industrial and telecom power supplies (post-regulation to 5/12/3.3 V)
- Multi-rail, high-efficiency power supplies in consumer electronics
- Battery-powered devices and charger front-ends
- LED backlighting/driver applications with proper feedback networks
In short: high-voltage, high-current step-down regulation for rugged, space-conscious DC-DC needs.

TO-263-5 (D2PAK) surface-mount package.