Texas Instruments LM22670QTJE-5.0/NOPB

Overview

LM22670QTJE-5.0/NOPB from Texas Instruments is a 42-V, 3-A synchronous step-down DC/DC regulator in HSOP-8 PowerPAD™ package, featuring fixed 5.0 V output, 500 kHz switching frequency, ±1.5% feedback reference accuracy, and integrated bootstrap diode. It delivers high efficiency (>90%) in industrial power supplies requiring stable 5 V rails from 12 V or 24 V input sources.

For engineers reviewing the LM22670QTJE-5.0/NOPB datasheet, LM22670QTJE-5.0/NOPB pinout, LM22670QTJE-5.0/NOPB application, or LM22670QTJE-5.0/NOPB equivalent, key selection criteria include its 4.5–42 V input range, internal voltage-mode compensation, thermal shutdown protection, and compatibility with low-ESR ceramic output capacitors.

Technical Context

The LM22670QTJE-5.0/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN variations. Its internal Type III compensation network is optimized for fixed 5 V output configurations and eliminates external compensation components.

It integrates a 120 mΩ N-channel MOSFET switch (HSOP-8 package), precision enable input with 1.6 V threshold and 0.6 V hysteresis, and a self-synchronizing RT/SYNC pin supporting adjustable frequency (200–1000 kHz) or system clock synchronization - though frequency adjustment and sync cannot operate simultaneously.

Key Specifications

Pinout & Package

LM22670QTJE-5.0/NOPB uses the HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with an exposed thermal pad that must be soldered to PCB ground for thermal performance and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM22670QTJE-5.0/NOPB, the LM22671QWJE-5.0/NOPB adds automotive qualification without altering performance, while the LM2596T-5.0 trades higher integration and frequency flexibility for lower cost and simpler qualification - making it viable only in non-automotive, non-high-density applications.

Availability

LM22670QTJE-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and embedded system designs requiring stable component supply, long-term manufacturability, and guaranteed thermal performance in HSOP-8 PowerPAD™ packaging.

Supply support for LM22670QTJE-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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability DC/DC conversion.

The LM22670 product line delivers SIMPLE SWITCHER® step-down regulators targeting industrial, automotive, and telecom applications where ease of use, thermal robustness, and minimal external component count are critical design objectives.

FAQ

What is the recommended input capacitor for LM22670QTJE-5.0/NOPB?

A minimum 10 µF low-ESR ceramic capacitor placed within 5 mm of the VIN and GND pins is recommended. TI's datasheet specifies using X5R/X7R dielectrics rated ≥16 V, with parallel placement of smaller 100 nF and larger 22 µF capacitors to suppress both high- and low-frequency noise. This ensures stable operation under fast load transients and prevents input voltage droop during switch turn-on.

Does LM22670QTJE-5.0/NOPB require an external feedback resistor divider?

No. The LM22670QTJE-5.0/NOPB has a factory-trimmed internal 5.0 V reference connected directly to the FB pin; the FB pin must be left unconnected in this fixed-output variant. Using an external divider would disrupt regulation and is explicitly prohibited in the datasheet - unlike the LM22670-ADJ version, which requires external resistors to set output voltage.

Can LM22670QTJE-5.0/NOPB synchronize to an external clock?

Yes. When the RT/SYNC pin is driven with a clean square wave ≥500 kHz and ≤1 MHz, the LM22670QTJE-5.0/NOPB enters synchronization mode at startup and locks to the rising edge of the external signal. During sync operation, current limit foldback is disabled, so short-circuit protection remains active but transitions to constant-frequency limiting instead of frequency foldback.

What thermal pad layout guidelines apply to LM22670QTJE-5.0/NOPB?

The exposed thermal pad (EP) of the HSOP-8 PowerPAD™ package must be soldered to a minimum 100 mm² copper area on the PCB, thermally connected via ≥4 thermal vias (0.3 mm diameter) to inner or bottom-layer ground planes. TI specifies R_θJA = 60°C/W with 1 in² copper; inadequate pad area or insufficient vias will cause junction temperature to exceed 125°C at full 3 A load, triggering thermal shutdown.

Is LM22670QTJE-5.0/NOPB compatible with ceramic output capacitors?

Yes - and it is specifically optimized for them. The LM22670QTJE-5.0/NOPB's internal compensation and stability architecture are validated with low-ESR ceramic capacitors (e.g., 22 µF X5R 16 V). Unlike older regulators, it does not require high-ESR tantalum or aluminum electrolytics, enabling smaller footprint, longer lifetime, and improved transient response without risk of oscillation.