My Inquiry
My Account
Texas Instruments LM2650MX-ADJ/NOPB
- Part No.:
- LM2650MX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LM2650MX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,929
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2650MX-ADJ/NOPB from Texas Instruments is a synchronous step-down DC/DC converter IC delivering up to 3A output current with adjustable output voltage (1.5V–16V), 90 kHz fixed-frequency PWM operation, and automatic hysteretic sleep mode for light-load efficiency. It operates across 4.5V–18V input, achieves 94% efficiency at 1A, and integrates dual NMOS power FETs in a 24-pin SOIC package for battery-powered portable instruments and GPS devices.
For engineers reviewing the LM2650MX-ADJ/NOPB datasheet, LM2650MX-ADJ/NOPB pinout, LM2650MX-ADJ/NOPB application, or LM2650MX-ADJ/NOPB equivalent, key selection criteria include its programmable sleep-in/sleep-out thresholds, logic-controlled shutdown (≤25 µA IQSD), soft-start capability, and thermal shutdown protection - all critical for low-power embedded power rail design.
Technical Context
The LM2650MX-ADJ/NOPB implements dual-mode regulation: fixed-frequency voltage-mode PWM for moderate-to-heavy loads (0.2A–3A) and automatic hysteretic "sleep" mode for light loads (<0.2A), using separate feedback comparators and external resistor-programmable thresholds (SIA/SOA pins). Its internal 4V VDD regulator powers signal circuitry, while bootstrapped high-side gate drive enables efficient NMOS switching.
It features synchronous rectification with integrated 130 mΩ (HS) and 125 mΩ (LS) RDS(on) power FETs, 5.5A current limiting, and frequency adjustability up to 300 kHz via FREQ ADJ pin. The device supports external clock synchronization (SYNC pin) and includes dedicated COMP, EA OUT, and SS nodes for full loop compensation and sequencing control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports 3–4-cell Li-ion, 6-cell lead-acid, or 8–12-cell NiMH battery stacks without external pre-regulation. |
| Output Voltage Range | 1.5V to 16V - set via external resistive divider on FB pin; reference voltage is 1.25V with ±1.2% tolerance over temperature. |
| Max Output Current | 3A continuous - enabled by integrated low-RDS(on) NMOS switches and thermal shutdown at 170°C junction temperature. |
| Efficiency @ 1A | 94% typical - achieved via synchronous rectification and optimized gate drive, reducing conduction and switching losses. |
| Quiescent Current (Sleep) | 850 µA typical - enables >100-hour standby in battery-powered GPS or portable data terminals. |
| Shutdown Current | 9 µA max - ensures minimal battery drain during system off-state with logic-high SD pin. |
| Switching Frequency | 90 kHz nominal, adjustable to 300 kHz - lower frequencies reduce core loss for high-efficiency inductors; higher frequencies shrink passive size. |
Pinout & Package
LM2650MX-ADJ/NOPB is housed in a 24-lead Small-Outline Integrated Circuit (SOIC) package (DW0024B), with exposed substrate pins (1,12) requiring connection to a large thermal ground plane for optimal power dissipation and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12 (SUB) | Die Substrate Connection | Must be grounded to same copper plane as PGND for thermal management and noise reduction. |
| 2 (SLEEP LOGIC) | Mode Selection Input | Low = forced PWM; high = forced sleep; open = automatic transition between modes based on load. |
| 3,4,9,10 (PGND) | Power Ground Return | High-current return path for both NMOS switches; requires low-inductance connection to minimize switching noise. |
| 5,8 (SW) | Power Switch Node | Drives external inductor; swings from near-GND to near-PVIN; demands short, direct PCB routing to limit EMI. |
| 6,7 (PVIN) | Power Stage Supply | Input rail for internal power FETs; bypassed individually with 0.1 µF low-ESR/ESL capacitors close to pins. |
| 11 (BOOT) | High-Side Gate Driver Supply | Bootstrapped ~9V above PVIN; enables full enhancement of high-side NMOS with 0.1 µF capacitor to SW. |
| 13 (FB) | Feedback Input | Connects to resistive divider from VOUT; sets regulated output voltage with 1.25V internal reference. |
| 14 (VDD) | Signal-Level Regulator Output | 4V internal rail for error amplifier and logic; bypassed with 0.2 µF capacitor to GND for stability. |
| 15 (COMP) | Error Amplifier Inverting Input | Used for loop compensation (RC/CC network); enables Type II or III compensation for wide load/transient response. |
| 16 (EA OUT) | Error Amplifier Output | Direct access to integrator output; allows external compensation or monitoring of control loop dynamics. |
| 17 (SS) | Soft-Start Control | Capacitor to GND sets ramp time; limits inrush current and enables controlled power-up sequencing. |
| 18 (GND) | Signal Ground Reference | Reference for VDD, COMP, EA OUT, and FB; must be isolated from PGND except at single-point star ground. |
| 19 (VIN) | VDD Regulator Input | Bypassed with 0.1 µF capacitor; supplies internal 4V regulator independent of PVIN for stable biasing. |
| 20 (FREQ ADJ) | Oscillator Frequency Set | Resistor to GND adjusts frequency from 90 kHz up to 300 kHz; sleep mode disabled above 250 kHz. |
| 21 (SYNC) | External Clock Input | Accepts TTL/CMOS clock for synchronization; grounded when unused to prevent noise coupling. |
| 22 (SD) | Shutdown Control | Active-high logic input; pulls device into micropower shutdown (≤25 µA) when driven high. |
| 23 (SOA) | Sleep-Out Threshold Adjust | Resistor to GND programs load current threshold at which device exits sleep mode into PWM. |
| 24 (SIA) | Sleep-In Threshold Adjust | Resistor to GND programs load current threshold at which device enters sleep mode from PWM. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous Power Stage | Dual NMOS FETs (130 mΩ HS / 125 mΩ LS) eliminate external diode, enabling >94% efficiency and reduced thermal footprint. |
| Automatic Light-Load Sleep Mode | Hysteretic control reduces quiescent current to 850 µA while maintaining regulation - critical for extended battery life. |
| Programmable Sleep Thresholds | Independent SIA and SOA pins allow precise tuning of sleep-in/sleep-out load points (e.g., 10 mA / 50 mA) via external resistors. |
| Logic-Controlled Shutdown | SD pin draws ≤25 µA in shutdown, enabling system-level power gating without additional enable circuitry. |
| Soft-Start with External Timing | SS pin accepts capacitor to GND for user-defined startup ramp rate, preventing input surge and enabling multi-rail sequencing. |
| Thermal Protection with Hysteresis | Junction shutdown at 170°C with automatic recovery after cooldown - prevents permanent damage under overload or poor heatsinking. |
Applications
| Portable GPS Receivers | Notebook Computer Core Rails |
|---|---|
|
Use Scenario: Powering GPS baseband processor and RF front-end from 3.7V Li-ion battery with tight ripple and long standby life. IC Role / Device Role / Timing Role: Primary 3.3V/1.8V synchronous buck converter providing regulated, low-noise supply with automatic sleep during satellite acquisition idle periods. Use Value: 94% efficiency at 1A and 850 µA sleep current extend battery runtime beyond 12 hours; soft-start prevents GPS lock disruption during cold start. |
Use Scenario: Generating 5V auxiliary rail for USB controllers and display interface in ultra-thin notebook designs. IC Role / Device Role / Timing Role: High-current (3A) step-down regulator operating from 12V main battery bus, synchronized to system clock via SYNC pin. Use Value: Integrated 3A capability eliminates need for external MOSFETs; 90 kHz switching enables use of low-cost, high-saturation inductors without compromising efficiency. |
| Handheld Data Terminals | Battery-Powered Portable Instruments |
|
Use Scenario: Powering ARM Cortex-M7 MCU, LCD driver, and 2D barcode scanner from 7.4V dual-cell Li-ion pack. IC Role / Device Role / Timing Role: Adjustable-output (1.5V–5V) buck converter supporting multiple subsystem voltages via FB divider reconfiguration. Use Value: Output voltage adjustability simplifies BOM across SKUs; logic-controlled SD pin enables MCU-driven power cycling of peripherals. |
Use Scenario: Supplying precision analog front-end (AFE) and microcontroller in handheld multimeter or environmental sensor. IC Role / Device Role / Timing Role: Low-noise, thermally robust DC/DC converter delivering stable 3.3V from 9V alkaline stack with minimal PCB area. Use Value: Thermal shutdown and current limiting protect against probe short-circuits; SOA/SIA programming tailors sleep behavior to intermittent measurement duty cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54302DDAR | Higher 3.5A rating, 2.5V–6V input range, integrated soft-start, but no sleep mode or SIA/SOA adjustment. | Optimized for compact 5V/3.3V rails in space-constrained designs; lacks programmable light-load optimization. | Select when board space is critical and light-load efficiency is secondary to peak current capability. |
| LM2678-5.0/NOPB | Fixed 5V output, 5A rating, 8V–40V input, no sleep mode, larger SOIC-20 package. | Targets industrial 24V systems requiring fixed 5V output; not suitable for battery voltage scaling or adaptive load management. | Select only for fixed-output, high-input-voltage applications where LM2650MX-ADJ/NOPB's adjustability and sleep features are unnecessary. |
Compared with TPS54302DDAR and LM2678-5.0/NOPB, the LM2650MX-ADJ/NOPB uniquely balances wide input/output flexibility, programmable sleep thresholds, and integrated synchronous FETs - making it the preferred choice for battery-powered systems demanding both high full-load efficiency and ultra-low standby consumption.
Availability
LM2650MX-ADJ/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, GPS navigation units, and handheld data terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2650MX-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-efficiency DC/DC conversion.
The LM2650MX-ADJ/NOPB belongs to TI's legacy high-current synchronous buck converter family, designed specifically for battery-powered portable electronics requiring adaptive efficiency across wide load ranges.
FAQ
What is the maximum input voltage rating for the LM2650MX-ADJ/NOPB?
The LM2650MX-ADJ/NOPB has an absolute maximum DC input voltage rating of 20V on PVIN and VIN pins, but its recommended operating range is 4.5V to 18V. Exceeding 18V may trigger overvoltage protection or degrade reliability; sustained operation above 20V risks permanent damage per the Absolute Maximum Ratings table.
How does the LM2650MX-ADJ/NOPB enter and exit sleep mode automatically?
The LM2650MX-ADJ/NOPB uses two externally programmed thresholds - sleep-in (SIA pin) and sleep-out (SOA pin) - to detect load current crossing points. When load drops below the SIA-set threshold, it transitions from PWM to hysteretic sleep mode; when load rises above the SOA-set threshold, it resumes PWM operation. This occurs without software intervention.
Can the LM2650MX-ADJ/NOPB be synchronized to an external clock?
Yes, the LM2650MX-ADJ/NOPB supports external clock synchronization via the SYNC pin. A TTL- or CMOS-compatible square wave applied to SYNC forces the internal oscillator to lock to that frequency. If unused, SYNC must be grounded to avoid noise susceptibility - floating is not permitted.
What is the purpose of the BOOT pin on the LM2650MX-ADJ/NOPB?
The BOOT pin provides the gate drive voltage for the high-side NMOS FET via bootstrapping. A 0.1 µF capacitor between BOOT and SW generates ~9V above PVIN during switching, ensuring sufficient VGS to fully enhance the high-side switch and minimize RDS(on). Incorrect BOOT capacitor placement causes erratic switching or FET failure.
Does the LM2650MX-ADJ/NOPB require external compensation components?
Yes, the LM2650MX-ADJ/NOPB requires external compensation on the COMP and EA OUT pins (RC, CC, R3, C10) to stabilize the voltage-mode control loop. TI provides recommended values in the datasheet for 90 kHz and 200 kHz designs; omitting or mis-sizing these components leads to oscillation or poor transient response.
Is the LM2650MX-ADJ/NOPB pin-compatible with other members of the LM2650 family?
Yes, all LM2650 variants - including LM2650M-ADJ/NOPB and LM2650MX-ADJ/NOPB - share identical 24-pin SOIC (DW) pinout and electrical functionality. The suffix differences indicate only packaging (tube vs. tape-and-reel) and do not affect circuit design, layout, or firmware integration.
LM2650MX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- 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):
- 18V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 3A
- Frequency - Switching:
- 90kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
LM2650MX-ADJ/NOPB FAQ
1.How can I place an order for LM2650MX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2650MX-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 LM2650MX-ADJ/NOPB reliable?
The price and inventory of LM2650MX-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 LM2650MX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2650MX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2650MX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2650MX-ADJ/NOPB?
LM2650MX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2650MX-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 LM2650MX-ADJ/NOPB?
For technical support, including LM2650MX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2650MX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2650MX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2650MX-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 LM2650MX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2650MX-ADJ/NOPB?
All LM2650MX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2650MX-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 LM2650MX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2650MX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2650MX-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…
