My Inquiry
My Account
Texas Instruments LM22673TJE-ADJ/NOPB
- Part No.:
- LM22673TJE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22673TJE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:788
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM22673TJE-ADJ/NOPB from Texas Instruments is a 42 V, 3 A step-down DC/DC voltage regulator in PFM (exposed pad) package, featuring adjustable output (down to 1.285 V), 500 kHz fixed switching frequency, and internal voltage-mode compensation. It integrates a 120 mΩ N-channel MOSFET switch and supports industrial power conversion from 24 V/12 V rails into sub-5 V logic supplies.
For engineers reviewing the LM22673TJE-ADJ/NOPB datasheet, LM22673TJE-ADJ/NOPB pinout, LM22673TJE-ADJ/NOPB application, or LM22673TJE-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), adjustable current limit via IADJ pin, ±1.5% feedback reference accuracy, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22673TJE-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward for stable loop gain across wide VIN variations. Its internal Type III compensation is optimized for output voltages ≤5 V, enabling stable operation without external compensation components when paired with standard buck power stages.
It features a bootstrap gate driver for the high-side N-MOSFET, requiring a 10 nF ceramic capacitor between BOOT and SW pins. Minimum on-time (100 ns) and off-time (200 ns) constrain practical VIN/VOUT ratios and enforce minimum load (~5 mA) to recharge the bootstrap capacitor each cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct regulation from unregulated 24 V, 12 V, or PoE-derived rails without pre-regulation. |
| Output Voltage | Adjustable down to 1.285 V - set via external resistor divider on FB pin; enables precise generation of 3.3 V, 2.5 V, 1.8 V, or custom logic supply rails. |
| Switch On-Resistance | 120 mΩ (typ) - reduces conduction loss at full 3 A load, enabling >90% efficiency at mid-load conditions with proper layout. |
| Switching Frequency | 500 kHz (±20%) - allows compact magnetics and output capacitors while maintaining good transient response in space-constrained designs. |
| Feedback Reference Accuracy | ±1.5% over –40°C to +125°C - ensures tight output voltage tolerance across industrial temperature range without trimming. |
| Current Limit | 4.2 A (typ), adjustable via IADJ pin - permits optimization of inductor and diode ratings for cost/size trade-offs in non-full-load applications. |
| Thermal Shutdown | 150°C junction - protects against sustained overload or poor PCB thermal design; auto-recovery at ~135°C. |
Pinout & Package
LM22673TJE-ADJ/NOPB uses the PFM (7-pin exposed pad) package, 10.16 mm × 9.85 mm body size. The exposed pad must be soldered to a thermal pad connected to system ground for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch Node Output | Connects to inductor and catch diode anode; carries high di/dt pulsed current - requires short, wide copper pour. |
| 2 - VIN | Main Input Supply | Accepts 4.5–42 V; bypass with ≥10 µF low-ESR capacitor near pin to suppress input ripple and EMI. |
| 3 - BOOT | Bootstrap Capacitor Terminal | Connects to 10 nF ceramic cap between BOOT and SW; supplies gate drive for high-side MOSFET - trace must be short and low-inductance. |
| 4 - GND | Power Ground | System return path for input/output currents; connects directly to exposed pad - forms primary thermal and electrical ground plane. |
| 5 - IADJ | Current Limit Adjust Input | Resistor to GND sets peak switch current (1.5–5.5 A); floating = default 4.2 A; accuracy ±35%/–25%. |
| 6 - FB | Feedback Input | High-impedance (230 nA bias) node sensing output voltage via resistor divider; sensitive to noise - route away from SW and place close to IC. |
| 7 - SS | Soft-Start Control | Capacitor to GND extends startup time linearly (e.g., 100 nF ≈ 5 ms); prevents inrush current and overshoot during power-up. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Voltage Mode Control | Eliminates need for external compensation network - reduces BOM count and design iteration time for standard buck topologies. |
| Stable with Low-ESR Ceramic Capacitors | Enables use of compact, high-reliability X7R/X5R MLCCs instead of bulkier electrolytics - improves long-term stability and temperature performance. |
| Integrated Boot-Strap Diode | Removes need for external bootstrap diode - simplifies layout and reduces component count in high-side gate drive circuitry. |
| Adjustable Soft-Start | Prevents output overshoot and limits inrush current by controlling ramp rate of FB reference - critical for powering FPGAs, DSPs, and multi-rail SoCs. |
| WEBENCH® Enabled | Full parametric design support including component selection, efficiency simulation, thermal modeling, and PCB layout guidance - accelerates time-to-prototype. |
Applications
| Industrial PLC Power Supply | Telecom Line Card Bias |
|---|---|
|
Use Scenario: Converting 24 V backplane rail to isolated 3.3 V/2.5 V for microcontroller, ADC, and communication interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated, low-noise DC power with fast transient response to handle burst-mode sensor sampling and real-time control loops. Use Value: 500 kHz switching enables small 4.7 µH inductors and 22 µF ceramic output caps; 120 mΩ RDS(ON) sustains >92% efficiency at 2 A load across ambient temperatures. |
Use Scenario: Generating 5 V and 3.3 V rails from 48 V telecom distribution bus in line cards supporting Ethernet PHYs and SFP+ modules. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator handling wide input transients (up to 42 V) while maintaining tight output regulation during hot-swap events. Use Value: 42 V absolute max rating and UVLO (4.3 V rise/3.9 V fall) ensure reliable start-up after brownouts; ±1.5% VREF guarantees compliance with IEEE 802.3af/at voltage tolerances. |
| Embedded System Main Rail | Automotive Body Control Module |
|
Use Scenario: Providing main 3.3 V supply for ARM Cortex-M7-based edge AI gateway with multiple peripherals and USB host interface. IC Role / Device Role / Timing Role: Core power management IC delivering up to 3 A continuous current with adjustable soft-start to coordinate power sequencing with PMIC and FPGA configuration. Use Value: Adjustable current limit (via IADJ) allows derating to 2.5 A for thermal margin in sealed enclosures; thermal shutdown at 150°C prevents latch-up under sustained overload. |
Use Scenario: Regulating 12 V vehicle battery (9–16 V nominal, up to 42 V load dump) to 5 V for MCU, CAN transceiver, and sensor interface in BCM. IC Role / Device Role / Timing Role: Robust buck converter meeting automotive transient requirements (ISO 7637-2 Pulse 5a) with integrated protection features. Use Value: Wide 4.5–42 V input range covers cold-crank (6.5 V) through load-dump (42 V); -40°C to +125°C operating range satisfies AEC-Q100 Grade 1 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22674TJE-ADJ/NOPB | Same pinout and function, but rated for 42 V input and 2.5 A output (vs. 3 A); lower RDS(ON) = 100 mΩ in SO PowerPAD only - not in PFM. | Lower output current capability limits use in high-power digital loads; better suited for 1.5–2 A applications where thermal headroom is constrained. | Select when 2.5 A maximum load suffices and board space allows SO PowerPAD; verify thermal performance in PFM footprint if substituting. |
| TPS54340DDAR | 42 V, 3.5 A buck regulator in 8-pin SO PowerPAD; 500 kHz fixed frequency; no IADJ pin - fixed 4.5 A current limit; requires external compensation. | Lacks adjustable current limit and internal compensation; higher quiescent current (146 µA vs. 3.4 mA); wider input range (3.5–42 V). | Choose for higher peak current margin or when external compensation is preferred for custom loop shaping; not drop-in due to different pinout and FB bias current (1.5 µA). |
Compared with LM22673TJE-ADJ/NOPB, LM22674TJE-ADJ/NOPB offers identical PFM packaging but reduced current capability, while TPS54340DDAR provides higher current and lower IQ but requires redesign of compensation and current-sense circuitry - neither is pin-compatible, and both demand layout revision and validation.
Availability
LM22673TJE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power systems, embedded computing, and automotive body electronics requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM22673TJE-ADJ/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 LM22673 series belongs to TI's SIMPLE SWITCHER® family - designed for ease-of-use in industrial, telecom, and automotive power applications where minimal external components, robust protection, and rapid design-in are critical.
FAQ
What is the minimum output voltage achievable with LM22673TJE-ADJ/NOPB?
The LM22673TJE-ADJ/NOPB has a feedback reference voltage of 1.285 V (typ), which sets the lowest possible output voltage when using the adjustable version. With a properly designed resistor divider and low-noise layout, stable outputs down to 1.285 V are achievable. The device's internal compensation is optimized for outputs ≤5 V, so operation at this minimum voltage maintains loop stability without external compensation components.
Does LM22673TJE-ADJ/NOPB require an external bootstrap diode?
No, LM22673TJE-ADJ/NOPB integrates the bootstrap diode internally. Only an external 10 nF ceramic capacitor between the BOOT and SW pins is required to supply gate drive voltage for the high-side N-channel MOSFET. This eliminates one discrete component, reduces layout complexity, and avoids reverse recovery issues associated with external Schottky diodes.
How is current limit adjusted on LM22673TJE-ADJ/NOPB?
Current limit on LM22673TJE-ADJ/NOPB is adjusted using a single resistor between the IADJ pin and GND. With IADJ floating, the default current limit is 4.2 A (typ). Connecting a resistor sets the limit between 1.5 A and 5.5 A per Figure 12 in the datasheet. The adjustment occurs at startup and remains fixed until next power cycle; accuracy is ±35%/–25% versus the default setting.
What thermal performance can be expected from LM22673TJE-ADJ/NOPB in PFM package?
In the PFM (7-pin exposed pad) package, LM22673TJE-ADJ/NOPB has a junction-to-ambient thermal resistance (RθJA) of 22°C/W when mounted on a 2-layer PCB with 1 in² copper area connected to the exposed pad. At 3 A load and 12 V input, typical power dissipation is ~0.4 W, resulting in ~9°C junction-to-ambient rise - well within the –40°C to +125°C operating range when proper thermal land pattern is used.
Is LM22673TJE-ADJ/NOPB qualified for automotive applications?
LM22673TJE-ADJ/NOPB is not AEC-Q100 qualified. The automotive-grade variant is LM22673-Q1 (e.g., LM22673QJTJE-ADJ/NOPB), which is AEC-Q100 Grade 1 qualified (–40°C to +125°C) and manufactured under automotive-specific process controls. For non-automotive industrial or telecom use, LM22673TJE-ADJ/NOPB meets all functional specifications but lacks automotive qualification documentation and test reporting.
LM22673TJE-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-7 Thin
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1.285V
- Voltage - Output (Max):
- 37V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-7 Thin
LM22673TJE-ADJ/NOPB FAQ
1.How can I place an order for LM22673TJE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22673TJE-ADJ/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM22673TJE-ADJ/NOPB reliable?
The price and inventory of LM22673TJE-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM22673TJE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22673TJE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22673TJE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22673TJE-ADJ/NOPB?
LM22673TJE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22673TJE-ADJ/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM22673TJE-ADJ/NOPB?
For technical support, including LM22673TJE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22673TJE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22673TJE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22673TJE-ADJ/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM22673TJE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22673TJE-ADJ/NOPB?
All LM22673TJE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22673TJE-ADJ/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM22673TJE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22673TJE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM22673TJE-ADJ/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
