onsemi LA5724M-TE-L-E

Overview

LA5724M-TE-L-E from SANYO Semiconductor is a separately-excited step-down switching regulator (variable type) with integrated 160 kHz time-base generator, current limiter, and thermal shutdown circuit. It delivers up to 0.6 A output current, supports 4.5–28 V input, and regulates output via external resistor divider on the VOS pin to achieve precise 1.23 V reference voltage - used in industrial DC-DC power supplies for embedded controllers.

For engineers reviewing the LA5724M-TE-L-E datasheet, pinout, applications, or equivalent options, key selection considerations include its cycle-by-cycle overcurrent protection at 0.7 A, short-circuit frequency reduction to 30 kHz, and thermal shutdown at 165 °C with 15 °C hysteresis.

Technical Context

This IC operates as a fixed-frequency, externally synchronized buck controller using an internal oscillator (128–192 kHz typ.) and feedback-controlled duty cycle. The VOS pin serves as both error amplifier input and reference node, with 1.23 V typical regulation target and only 1–2 µA bias current.

Protection is implemented at silicon level: overcurrent detection triggers immediate switch-off per cycle; short-circuit condition (VOS < 0.8 V) forces frequency shift to 30 kHz to limit peak inductor current; thermal shutdown activates at 165 °C with built-in 15 °C hysteresis to prevent oscillation near trip point.

Key Specifications

Pinout & Package

LA5724M-TE-L-E is housed in SANYO's MFP8 (225 mil) package - an 8-pin molded flat package with 0.65 mm pitch, 6.4 mm × 4.4 mm body, and 1.7 mm max height. Pins are surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LA5724M-TE-L-E, TL2575-12IKV offers higher current but lacks output adjustability, while NCP3020ADR2G supports greater current and frequency but adds external FET complexity - LA5724M-TE-L-E remains optimal for compact, adjustable 0.6 A industrial supplies where simplicity and thermal robustness are prioritized.

Availability

LA5724M-TE-L-E is available at Aetrix Electronics and suitable for industrial sensor power supplies, PLC I/O modules, and embedded motor drive auxiliary supplies requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LA5724M-TE-L-E 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

SANYO Semiconductor was a Japanese semiconductor manufacturer specializing in analog and power management ICs before its acquisition by ON Semiconductor in 2011. Known for rugged, thermally optimized regulators and audio amplifiers.

The LA5724M-TE-L-E belongs to SANYO's monolithic linear IC family targeting industrial-grade DC-DC conversion - designed specifically for reliable, low-component-count buck regulation in harsh ambient environments.

FAQ

What is the function of the VOS pin on the LA5724M-TE-L-E?

The VOS pin on the LA5724M-TE-L-E serves as the feedback input for output voltage regulation, with a precise 1.23 V (typ) internal reference. It accepts a resistor divider from the output rail and draws only 1–2 µA bias current, enabling high-impedance networks. The LA5724M-TE-L-E adjusts duty cycle to maintain 1.23 V at this pin, thereby stabilizing the output voltage.

Does the LA5724M-TE-L-E require an external MOSFET?

No, the LA5724M-TE-L-E integrates the power switch driver but does not include a power MOSFET. Its SWOUT pin drives an external N-channel MOSFET gate, making it a controller-not a full converter. This architecture allows flexibility in selecting MOSFET voltage/current ratings and optimizing efficiency for specific LA5724M-TE-L-E applications.

What happens during a short-circuit condition on the LA5724M-TE-L-E output?

When the LA5724M-TE-L-E detects VOS pin voltage falling below 0.8 V - indicating output short - it automatically shifts switching frequency from 160 kHz to 30 kHz. This reduces peak inductor current and fault energy. The LA5724M-TE-L-E maintains regulation attempt but requires increased inductance (per datasheet guidance) to sustain safe operation under such fault conditions.

What is the maximum allowable input voltage for the LA5724M-TE-L-E?

The LA5724M-TE-L-E has an absolute maximum input voltage rating of 30 V, but its recommended operating range is 4.5–28 V. Operation above 28 V risks exceeding safe operating area margins, especially under transient conditions. For reliable long-term use in industrial systems, the LA5724M-TE-L-E should be operated within the 4.5–28 V window with appropriate input filtering.

How does thermal shutdown work on the LA5724M-TE-L-E?

The LA5724M-TE-L-E features a thermal shutdown circuit that disables switching when junction temperature reaches 165 °C (design target), with 15 °C hysteresis to prevent cycling. Once tripped, the LA5724M-TE-L-E halts operation until temperature falls to ~150 °C, then resumes normal regulation - ensuring safe recovery without manual reset.