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Texas Instruments LM2696MXAX/NOPB
- Part No.:
- LM2696MXAX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2696MXAX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:944
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Product details
Overview
LM2696MXAX/NOPB from Texas Instruments is a 3A, constant on-time synchronous buck DC-DC regulator in HTSSOP-16 with exposed thermal pad. It operates from 4.5V–24V input, delivers adjustable output voltage via external feedback resistors, integrates a 130 mΩ high-side NMOS switch, and features power-good flag, soft-start, and internal 3.65V EXTVCC regulator - used in industrial power supplies and embedded system point-of-load conversion.
For engineers reviewing the LM2696MXAX/NOPB datasheet, LM2696MXAX/NOPB pinout, LM2696MXAX/NOPB application, or LM2696MXAX/NOPB equivalent, key selection considerations include its constant-frequency operation across input range (100–500 kHz), no-compensation design, TTL-compatible shutdown, 12 µA shutdown current, and thermal shutdown at 165°C.
Technical Context
The LM2696MXAX/NOPB implements a constant on-time control architecture with input voltage feed-forward to maintain stable switching frequency across 4.5V–24V AVIN. Its on-time is set externally via RON pin current (kON = 66 µA·µs nominal) and automatically adjusted inversely with input voltage.
It integrates an N-channel high-side MOSFET (RDS(on) = 0.13 Ω typ), bootstrap gate driver, analog bias rail (AVIN), internal 3.65V LDO (EXTVCC), and cycle-by-cycle peak-current limiting (4.9A typ). Power-good monitoring is implemented via open-drain PGOOD referenced to 93.5% of VFB (1.254V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V–24V - supports wide industrial input rails including 12V and 24V systems without pre-regulation. |
| Max Output Current | 3A - sufficient for FPGA core, DSP, or microcontroller point-of-load applications. |
| Switch RDS(on) | 0.13 Ω (typ) - reduces conduction loss and improves efficiency at high load currents. |
| Feedback Reference | 1.254V (typ) - enables precise output voltage setting via external resistor divider (e.g., 5V, 3.3V, 1.8V). |
| Shutdown Current | 12 µA - enables ultra-low-power sleep mode in battery-backed or energy-sensitive systems. |
| Switching Frequency | 100–500 kHz - adjustable via RON pin; 300 kHz recommended for initial design balancing size and efficiency. |
| Thermal Shutdown | 165°C (trip), 155°C (release) - protects against sustained overload or poor heatsinking in enclosed enclosures. |
Pinout & Package
Package: HTSSOP-16 (PWP0016A) with exposed thermal pad (must be soldered to PCB ground plane for thermal performance; θJ-A = 35.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 15, 16 | SW | Switching node - connects to inductor and catch diode; carries high dv/dt and pulsed current. |
| 4 | CBOOT | Bootstrap capacitor input - charges via internal diode during SW low phase to drive high-side FET gate above PVIN. |
| 5 | AVIN | Analog supply input - powers internal reference and error amplifier; bypass with 1 µF ceramic. |
| 6 | EXTVCC | Internal 3.65V regulator output - powers control circuitry; decouple with 1 µF ceramic; usable for light external loads (<50 µA). |
| 7 | FB | Feedback input - senses scaled output voltage; connected to resistor divider; 1.254V reference sets regulation point. |
| 8 | N/C | No connect - left unconnected; not internally bonded. |
| 9 | GND | Analog and power ground - common return for AVIN, FB, SS, SD, PGOOD; tied to exposed pad. |
| 10 | SS | Soft-start capacitor node - controls output ramp rate; 1 µA source current sets startup time (tSS = 1.25V × CSS / 1 µA). |
| 11 | PGOOD | Open-drain power-good flag - asserts low when VOUT reaches 93.5% of target; requires external pull-up (10–100 kΩ). |
| 12 | RON | On-time programming pin - current into this pin (0.65V bias) sets TON; resistor from PVIN determines frequency. |
| 13 | SD | Shutdown control - TTL-compatible; <0.6V disables regulator, >1.8V enables; bypass with 1 nF ceramic. |
| 14 | PVIN | Main power input - supplies high-side FET and gate driver; must be decoupled with bulk + ceramic capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| No compensation required | Constant on-time + input feed-forward eliminates need for external compensation network - reduces BOM count and layout sensitivity. |
| Integrated 3.65V EXTVCC LDO | Provides dedicated low-noise supply for internal logic and analog blocks - improves PSRR and avoids coupling noise from PVIN. |
| Programmable switching frequency | 100–500 kHz via RON pin resistor - enables optimization for inductor size (higher fSW) vs. efficiency (lower fSW). |
| Robust protection suite | Includes cycle-by-cycle overcurrent limit (4.9A), thermal shutdown (165°C), UVLO on AVIN (4.125V), and PGOOD monitoring - ensures safe operation under fault conditions. |
| TTL-compatible shutdown | VIH ≥ 1.8V, VIL ≤ 0.6V - allows direct interfacing with microcontrollers, CPLDs, and logic families without level-shifting. |
Applications
| Industrial PLC Power Rails | Embedded System Point-of-Load |
|---|---|
Use Scenario: Providing stable 3.3V/5V rails for I/O modules, communication interfaces, and sensor signal conditioning in programmable logic controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator delivering up to 3A with fast transient response to handle burst-mode I/O activity. Use Value: Constant on-time control ensures minimal output voltage deviation during rapid load steps (e.g., relay coil energization), reducing need for oversized output capacitance. | Use Scenario: Generating core voltage for ARM Cortex-M7 microcontrollers or low-power FPGAs in edge-computing gateways powered by 12V PoE or wall adapters. IC Role / Device Role / Timing Role: Adjustable-output buck converter with soft-start and PGOOD for controlled power sequencing with companion regulators. Use Value: 12 µA shutdown current and integrated EXTVCC enable low-quiescent-power standby modes essential for always-on IoT devices. |
| LCD Monitor Logic Supply | Set-Top Box DC-DC Conversion |
Use Scenario: Generating 1.8V or 2.5V logic supply for timing controllers and display interface ICs in commercial LCD monitors using 12V or 19V adapter inputs. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck regulator with EMI-optimized constant-frequency operation. Use Value: 130 mΩ integrated MOSFET and 300 kHz default switching frequency allow compact 2-layer PCB designs with minimal filtering components. | Use Scenario: Converting 12V input to 5V/3.3V rails for SoC, memory, and audio subsystems in digital cable/satellite receivers with strict thermal constraints. IC Role / Device Role / Timing Role: Thermally robust buck regulator with exposed-pad HTSSOP package and 165°C thermal shutdown. Use Value: Exposed thermal pad and 35.1°C/W θJ-A enable reliable 3A operation in sealed plastic enclosures without forced airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2698MMX/NOPB | Higher input range (4.5V–42V), same 3A rating, 150 mΩ RDS(on), fixed 300 kHz frequency. | Suitable for automotive 24V systems with load dump; lacks RON-programmability and EXTVCC output. | Select when wider VIN range and automotive qualification are needed; avoid if adjustable frequency or EXTVCC rail reuse is required. |
| TPS54332DDAR | 3A, 3.5V–28V input, 110 mΩ RDS(on), current-mode control, integrated compensation, 1.5V reference. | Requires external compensation components; higher light-load efficiency via Eco-mode; no EXTVCC output. | Prefer when design prioritizes ease of loop stability over component count reduction; verify PGOOD compatibility with existing sequencing logic. |
Compared with LM2698MMX/NOPB and TPS54332DDAR, the LM2696MXAX/NOPB uniquely combines programmable frequency, no-compensation operation, and a user-accessible 3.65V EXTVCC rail - making it optimal for space-constrained industrial designs requiring flexible timing and auxiliary biasing.
Availability
LM2696MXAX/NOPB is available at Aetrix Electronics and suitable for industrial PLC power rails, embedded system point-of-load conversion, LCD monitor logic supplies, and set-top box DC-DC conversion requiring stable component supply and long-term production support.
Supply support for LM2696MXAX/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 power conversion ICs.
The LM2696MXAX/NOPB belongs to TI's constant on-time buck regulator product line, designed specifically for industrial and consumer applications demanding high efficiency, fast transient response, and simplified design without compensation networks.
FAQ
What is the minimum recommended soft-start capacitor value for LM2696MXAX/NOPB?
The LM2696MXAX/NOPB soft-start capacitor (CSS) should be sized to ensure tSS ≥ COUTVOUT/3A per datasheet Equation (17). For a typical 5V/1000 µF output, minimum CSS is ~167 nF. However, 100 nF is commonly used to balance startup time and inrush control. The LM2696MXAX/NOPB internal ISS source current is 1 µA (typ), so CSS directly sets ramp rate: VREF ramps from 0V to 1.25V linearly.
Does LM2696MXAX/NOPB require a minimum output capacitor ESR for stability?
Yes - the LM2696MXAX/NOPB's constant on-time control relies on output voltage ripple at the FB pin for switching decisions. A minimum ESR is required to ensure ripple dominates over capacitive reactance. For ceramic outputs, an RC feed-forward network (RFF ≈ 1 MΩ, CFF calculated per Equation 11) is mandatory to inject in-phase ripple into FB. Without it, the LM2696MXAX/NOPB may become unstable.
Can LM2696MXAX/NOPB operate with PVIN and AVIN supplied from separate rails?
Yes - the LM2696MXAX/NOPB supports split-rail operation where AVIN is at a higher voltage than PVIN (e.g., AVIN = 12V, PVIN = 5V), but AVIN must never be lower than PVIN. This configuration isolates analog bias from noisy power rail transients. The LM2696MXAX/NOPB datasheet specifies AVIN range as 4.5V–24V independent of PVIN, enabling flexible system-level power architecture.
What is the purpose of the RON pin on LM2696MXAX/NOPB, and how is it used?
The RON pin on LM2696MXAX/NOPB programs the switch on-time (TON) by sinking a current proportional to (PVIN − 0.65V)/RON. Since TON = kON × RON / (PVIN − 0.65V), connecting RON from PVIN to RON maintains constant frequency across input voltage. Typical RON values range from 10 kΩ (≈500 kHz) to 50 kΩ (≈100 kHz). No capacitor may be placed on RON - AC coupling disrupts operation.
How does the PGOOD function work on LM2696MXAX/NOPB, and what external component is required?
The LM2696MXAX/NOPB PGOOD pin is an open-drain output that pulls low when VOUT drops below 93.5% of the FB-set voltage (e.g., 93.5% × 1.254V = 1.173V for 5V output). It requires an external pull-up resistor (10–100 kΩ) to VOUT or system VCC. The LM2696MXAX/NOPB does not assert PGOOD during soft-start - it activates only after regulation is achieved and remains active until undervoltage or shutdown occurs.
LM2696MXAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm 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):
- 24V
- Voltage - Output (Min/Fixed):
- 1.254V
- Voltage - Output (Max):
- 20V
- Current - Output:
- 3A
- Frequency - Switching:
- 100kHz ~ 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM2696MXAX/NOPB FAQ
1.How can I place an order for LM2696MXAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2696MXAX/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 LM2696MXAX/NOPB reliable?
The price and inventory of LM2696MXAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2696MXAX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2696MXAX/NOPB?
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LM2696MXAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2696MXAX/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 LM2696MXAX/NOPB?
For technical support, including LM2696MXAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2696MXAX/NOPB requirements.
6.How does Aetrix verify that LM2696MXAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2696MXAX/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 LM2696MXAX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2696MXAX/NOPB?
All LM2696MXAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2696MXAX/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 LM2696MXAX/NOPB part is unused and in its original packaging.
Return procedure for LM2696MXAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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