My Inquiry
My Account
Texas Instruments LM22677QTJE-ADJ/NOPB
- Part No.:
- LM22677QTJE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22677QTJE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:866
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM22677QTJE-ADJ/NOPB from Texas Instruments is a 42-V, 5-A synchronous step-down DC/DC regulator with adjustable output (down to 1.285 V), 500-kHz default switching frequency, and integrated 100-mΩ N-channel MOSFET. It operates from 4.5 V to 42 V input, delivers ±1.5% feedback reference accuracy, and supports thermal shutdown, current limiting, and precision enable control - deployed in industrial power rails and telecom intermediate bus conversion.
For engineers reviewing the LM22677QTJE-ADJ/NOPB datasheet, LM22677QTJE-ADJ/NOPB pinout, LM22677QTJE-ADJ/NOPB application, or LM22677QTJE-ADJ/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, RT/SYNC programmable frequency (200–1000 kHz), integrated bootstrap diode, soft-start timing (~500 µs), and stable operation with low-ESR ceramic output capacitors.
Technical Context
The LM22677QTJE-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward for loop gain stabilization, enabling optimized transient response without external compensation. Its internal Type III compensation network is calibrated for outputs ≤5 V, and the FB pin references a precise 1.285-V (typ) bandgap.
It integrates a high-side N-channel MOSFET switch with 100-mΩ RDS(ON), bootstrapped gate drive (requiring external BOOT–SW capacitor), and a precision enable input with 1.6-V threshold and 0.6-V hysteresis. Minimum on-time (~100 ns) and minimum off-time (~100 ns) constrain duty-cycle range and support wide VIN/VOUT ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports 24-V/12-V industrial buses and automotive cold-crank transients. |
| Output Current | Up to 5 A continuous - enables single-regulator solutions for FPGA core or DSP I/O rails. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables 3.3-V, 2.5-V, or 1.8-V generation via resistor divider. |
| Switching Frequency | 500 kHz (default), adjustable 200–1000 kHz - balances EMI, efficiency, and external component size. |
| RDS(ON) | 100 mΩ (typ) - reduces conduction loss at full load; contributes to >90% peak efficiency. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and extended-temperature embedded systems. |
| Quiescent Current | 3.4 mA (typ) - minimizes no-load power draw in always-on subsystems. |
Pinout & Package
LM22677QTJE-ADJ/NOPB uses the NDR (TO-263-7) package: 10.16 mm × 9.85 mm body with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (RθJA = 22°C/W with 1-in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Drives external inductor; swings from GND to VIN; requires low-inductance layout to minimize ringing. |
| VIN | Main input supply | Connects to bulk input capacitor; powers internal LDO and gate driver; must withstand 42-V max. |
| BOOT | Bootstrap supply | Provides gate drive voltage for high-side FET; requires 10-nF ceramic cap between BOOT and SW. |
| GND | Power and signal ground | Common return for all circuits; connects to exposed pad for thermal and electrical integrity. |
| RT/SYNC | Oscillator control | Selects mode: floating = 500 kHz; resistor-to-GND = 200–1000 kHz; external clock = sync mode. |
| FB | Feedback input | Senses output via resistor divider; regulates VOUT by comparing to 1.285-V internal reference. |
| EN | Enable control | Logic-level input (1.6-V threshold); enables sequencing, UVLO override, and shutdown (25 µA IQ). |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates need for external compensation network - reduces BOM count and design iteration time. |
| Integrated bootstrap diode | Removes external bootstrap diode requirement - simplifies layout and improves reliability over discrete solutions. |
| Adjustable soft-start | Fixed ~500-µs ramp - prevents inrush current and output overshoot during power-up. |
| Thermal shutdown & current limit | Protects against sustained overload or PCB overheating - latches off until thermal recovery or EN cycle. |
| WEBENCH® enabled | Full online design support including component selection, efficiency simulation, and thermal modeling. |
Applications
| Industrial Control Power | Telecom Intermediate Bus |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor interfaces from 24-V factory bus. IC Role / Device Role / Timing Role: Primary buck converter generating isolated 5-V or 3.3-V logic rails with tight line/load regulation. Use Value: Wide 4.5–42-V input range tolerates brownouts and surges; ±1.5% VREF ensures ADC reference stability. | Use Scenario: Converting 48-V telecom backplane to 12-V intermediate bus for downstream POL converters. IC Role / Device Role / Timing Role: High-current front-end regulator delivering up to 5 A with minimal external components. Use Value: 100-mΩ RDS(ON) and >90% efficiency reduce heat sink requirements; 500-kHz switching enables compact magnetics. |
| Embedded System Core Supply | Automotive Body Control Module |
Use Scenario: Generating 1.2-V core voltage for ARM Cortex-M7 microcontrollers in edge gateways. IC Role / Device Role / Timing Role: Adjustable-output buck supplying processor core with precise soft-start and sequencing control. Use Value: FB pin accuracy (±1.5%) and low 230-nA bias current maintain regulation across temperature and load. | Use Scenario: Powering infotainment MCU and CAN transceivers from 12-V battery with cold-crank support. IC Role / Device Role / Timing Role: Automotive-grade buck regulator (LM22677-Q1 variant) with –40°C to +125°C operation and AEC-Q100 Grade 1 qualification. Use Value: 42-V absolute max rating survives load-dump transients; precision EN input enables controlled startup during battery recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670TJE-ADJ/NOPB | 3-A rated (vs. 5-A); identical pinout, package, and feature set except lower current capability. | Suitable for <3-A loads where thermal margin or cost optimization is prioritized. | Select when full 5-A headroom is unnecessary - reduces board area and cost without redesign. |
| LM2596T-ADJ/NOPB | Lower 40-V max input; 3-A output; 150-kHz fixed frequency; no RT/SYNC or sync capability. | Better suited for cost-sensitive, low-EMI, non-synchronized applications with modest input range. | Choose for legacy designs or where 500-kHz+ switching is not required - avoids frequency coordination complexity. |
Compared with LM22677QTJE-ADJ/NOPB, the LM22670TJE-ADJ/NOPB offers identical functionality at reduced current capacity, while the LM2596T-ADJ/NOPB trades switching flexibility and input voltage headroom for lower system cost and simpler implementation.
Availability
LM22677QTJE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and embedded system applications requiring stable component supply, long-term lifecycle assurance, and automotive-qualified alternatives (LM22677-Q1).
Supply support for LM22677QTJE-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 ICs, with decades of expertise in high-reliability power conversion.
The LM22677 product line delivers SIMPLE SWITCHER® step-down regulators targeting high-voltage industrial, telecom, and automotive applications where ease-of-use, thermal robustness, and minimal external component count are critical.
FAQ
What is the minimum output voltage achievable with LM22677QTJE-ADJ/NOPB?
The LM22677QTJE-ADJ/NOPB has a nominal feedback reference voltage of 1.285 V, which defines the lowest possible output voltage when using a direct connection (no resistor divider) from VOUT to FB. With proper resistor selection and layout, the device reliably regulates down to this value across its full operating temperature range (–40°C to +125°C), as confirmed by the ±1.5% VFB specification in the Electrical Characteristics table.
Does LM22677QTJE-ADJ/NOPB require an external bootstrap diode?
No, the LM22677QTJE-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external diode between VIN and BOOT. This simplifies layout and improves reliability. Users must still place a 10-nF ceramic capacitor directly between BOOT and SW pins with short, low-inductance traces to ensure proper high-side gate drive during each switching cycle.
Can LM22677QTJE-ADJ/NOPB synchronize to an external clock?
Yes, LM22677QTJE-ADJ/NOPB supports external synchronization via the RT/SYNC pin. When driven with a clean square wave (1.75-V threshold, 1-MHz max), the device locks to the rising edge of the external clock. Synchronization requires the external frequency to exceed the internal 500-kHz oscillator and remain below 1 MHz; loss of the external clock causes automatic reversion to the internal oscillator.
What thermal performance can be expected from LM22677QTJE-ADJ/NOPB in TO-263 packaging?
In the NDR (TO-263-7) package, LM22677QTJE-ADJ/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 22°C/W when mounted on 1 in² of 2-oz copper. Actual thermal performance depends on PCB copper area, airflow, and layer stack-up; TI's AN-1797 confirms RθJA may vary from 20–30°C/W. The exposed pad must be soldered to GND for optimal conduction cooling.
Is LM22677QTJE-ADJ/NOPB pin-compatible with LM22677-Q1?
Yes, LM22677QTJE-ADJ/NOPB and LM22677-Q1 share identical pin configuration, package (NDR/TO-263-7), and electrical functionality. The Q1 variant adds AEC-Q100 Grade 1 qualification (–40°C to +125°C), enhanced ESD robustness, and automotive-specific testing - making it a drop-in replacement where automotive compliance is required.
LM22677QTJE-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:
- 5A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-7 Thin
LM22677QTJE-ADJ/NOPB FAQ
1.How can I place an order for LM22677QTJE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22677QTJE-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 LM22677QTJE-ADJ/NOPB reliable?
The price and inventory of LM22677QTJE-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 LM22677QTJE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22677QTJE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22677QTJE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22677QTJE-ADJ/NOPB?
LM22677QTJE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22677QTJE-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 LM22677QTJE-ADJ/NOPB?
For technical support, including LM22677QTJE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22677QTJE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22677QTJE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22677QTJE-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 LM22677QTJE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22677QTJE-ADJ/NOPB?
All LM22677QTJE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22677QTJE-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 LM22677QTJE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22677QTJE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM22677QTJE-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…
