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Texas Instruments LM2696MXA
- Part No.:
- LM2696MXA
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2696MXA.pdf
- Description:
- IC REG BUCK ADJ 3A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,226
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Product details
Overview
LM2696MXA from Texas Instruments is a 3A, constant on-time synchronous buck DC-DC regulator in HTSSOP-16 package with integrated 130 mΩ high-side NMOS switch, 4.5V–24V input range, and adjustable output voltage via external feedback resistors. It delivers stable power to LCD monitors, set-top boxes, and industrial embedded systems requiring fast transient response without compensation.
For engineers reviewing the LM2696MXA datasheet, LM2696MXA pinout, LM2696MXA application, or LM2696MXA equivalent, key selection criteria include its 100–500 kHz programmable switching frequency, 12 µA shutdown current, internal soft-start, power-good flag, and input voltage feed-forward architecture enabling constant frequency across VIN.
Technical Context
The LM2696MXA employs a constant on-time (COT) control scheme where on-time is inversely proportional to AVIN, ensuring stable switching frequency across 4.5V–24V input. Its internal 130 mΩ NMOS switch, bootstrap gate driver, and integrated EXTVCC LDO eliminate need for external bias rails.
It features cycle-by-cycle peak-current limiting (4.9A typical), thermal shutdown at 165°C, and a dedicated RON pin to set on-time via external resistor-enabling precise frequency tuning from 100 kHz to 500 kHz without loop compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V–24V - supports wide industrial and consumer DC bus voltages including 12V and 24V systems. |
| Max Output Current | 3A - continuous load capability with internal MOSFET; enables single-chip step-down for mid-power applications. |
| Switching Frequency | 100–500 kHz - programmable via RON pin; balances inductor size, efficiency, and EMI performance. |
| RDS(on) | 0.13 Ω (typ) - low conduction loss improves full-load efficiency and reduces thermal stress. |
| Feedback Reference | 1.254 V (typ) - precision bandgap reference enables accurate output regulation with external resistor divider. |
| Shutdown Current | 12 µA - ultra-low quiescent draw during sleep mode, critical for battery-backed or always-on systems. |
| Soft-Start Time | Programmable via CSS capacitor - prevents inrush current and ensures controlled output ramp-up during power-on. |
| Power-Good Flag | Open-drain PGOOD with 93.5% VFB threshold - provides reliable system sequencing and fault indication. |
Pinout & Package
Package: HTSSOP-16 (PWP0016A) with exposed thermal pad (must be connected to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 14, 15, 16 | SW / PVIN | Switching node (SW) and power input (PVIN) - SW connects to inductor; PVIN supplies high-current path to internal FET. |
| 4 | CBOOT | Bootstrap capacitor input - charges via internal diode during SW low phase to drive high-side gate above PVIN. |
| 5 | AVIN | Analog supply input - powers internal analog circuitry; must be bypassed with 1 µF ceramic capacitor. |
| 6 | EXTVCC | Internal 3.65V LDO output - powers internal logic; requires 1 µF decoupling and can source ≤50 µA externally. |
| 7 | FB | Feedback input - senses scaled output voltage; comparator compares to 1.254 V reference for regulation. |
| 8 | N/C | No connect - unused pin; must remain unconnected per datasheet. |
| 9 | GND | Analog and power ground - shared reference; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. |
| 10 | SS | Soft-start capacitor connection - controls reference ramp rate; source current = 1 µA (typ) to charge external CSS. |
| 11 | PGOOD | Open-drain power-good flag - asserts low when VOUT drops below 93.5% of VFB; requires external pull-up. |
| 12 | RON | On-time programming pin - current into this pin (0.65 V bias) sets TON via kON constant (66 µA·µs). |
| 13 | SD | Shutdown control - TTL-compatible; <0.6 V disables regulator, >1.8 V enables; internal pull-up allows floating operation. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Constant on-time control with input voltage feed-forward eliminates need for type-II/III compensation network. |
| Integrated high-side NMOS switch | 130 mΩ RDS(on) at 3A reduces conduction loss and simplifies layout vs. external MOSFET solutions. |
| Programmable switching frequency | 100–500 kHz via RON pin resistor enables optimization of inductor size, efficiency, and EMI filtering. |
| Internal soft-start and power-good | SS pin controls startup slew rate; PGOOD provides sequenced enable signal for downstream regulators or microcontrollers. |
| Robust protection suite | Cycle-by-cycle overcurrent limit (4.9A), thermal shutdown (165°C), UVLO (4.125 V rising), and short-circuit safe off-timer. |
| Low-noise analog bias rail | Dedicated AVIN pin with 1 µF bypass enables clean analog reference and stable regulation under noisy input conditions. |
Applications
| Industrial Power Supplies | LCD Display Backlight Drivers |
|---|---|
Use Scenario: Providing regulated 5V/3.3V rails for PLC I/O modules and motor controller logic in factory automation cabinets with 24V DC input. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3A continuous output; handles line transients and load steps without compensation. Use Value: Eliminates external compensation components and reduces BOM count while maintaining ±1% output accuracy across temperature. | Use Scenario: Generating 12V for CCFL or LED backlight drivers in commercial LCD monitors operating from 12V or 19V adapters. IC Role / Device Role / Timing Role: Adjustable-output buck converter with soft-start and PGOOD for safe backlight enable sequencing. Use Value: Programmable frequency avoids audible noise in 20–25 kHz range; low shutdown current extends standby battery life. |
| Set-Top Box Power Management | Embedded Networking Equipment |
Use Scenario: Supplying 1.2V core and 3.3V I/O rails for SoC-based media processors in cable/satellite receivers with tight thermal constraints. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with integrated FET and thermal shutdown for compact, fanless enclosures. Use Value: 130 mΩ RDS(on) and HTSSOP-16 exposed pad enable >88% efficiency at 2A, reducing heatsink requirements. | Use Scenario: Powering FPGA configuration, PHY interfaces, and management controllers in enterprise switches and routers using 12V intermediate bus. IC Role / Device Role / Timing Role: Primary point-of-load regulator with PGOOD signaling and shutdown control for system-level power sequencing. Use Value: TTL-compatible SD pin and open-drain PGOOD simplify integration with CPLD-based power managers and reduce firmware overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2698MHX/NOPB | Same COT architecture but rated for 5A output; larger HTSSOP-20 package; higher RDS(on) (110 mΩ) and 4.5–36V input. | Supports higher current loads and wider input range; requires larger PCB footprint and different thermal design. | Select LM2698MHX/NOPB only if >3A output or >24V input is required; not drop-in compatible due to pinout and package differences. |
| TPS54331DR | Voltage-mode PWM controller (not COT); 3A output; 3.5–28V input; requires external compensation; 170 mΩ high-side FET. | Slower transient response than LM2696MXA; needs external RC network for stability; lower quiescent current (145 µA active). | Choose TPS54331DR when design prioritizes ultra-low no-load IQ over transient performance or when existing compensation expertise exists. |
Compared with LM2698MHX/NOPB and TPS54331DR, the LM2696MXA offers superior transient response and zero-compensation design simplicity at 3A, making it optimal for space-constrained, fast-response applications where input stays within 4.5–24V.
Availability
LM2696MXA is available at Aetrix Electronics and suitable for industrial power supplies, LCD display backlights, set-top boxes, embedded networking equipment, and factory automation systems requiring stable component supply and long-term manufacturability.
Supply support for LM2696MXA 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 solutions.
The LM2696 product line delivers constant on-time buck regulators optimized for fast transient response in consumer, industrial, and computing applications where simplicity, efficiency, and robustness are critical.
FAQ
What is the recommended minimum soft-start capacitor value for LM2696MXA?
The LM2696MXA soft-start capacitor (CSS) must be sized to prevent current-limit triggering during startup. Based on ISS = 1 µA (typ), a minimum CSS of 100 nF yields ~125 ms soft-start time. Smaller values risk insufficient ramp rate, causing inrush current and premature current-limit activation. Always verify with actual load and output capacitance.
Can LM2696MXA operate with an input voltage below 4.5V?
No. The LM2696MXA has an AVIN under-voltage lockout (UVLO) threshold of 4.125 V (rising), and absolute minimum AVIN is 4.5 V per operating range specifications. Operation below 4.5 V is outside guaranteed performance and may result in unstable regulation or failure to start.
How does the RON pin set switching frequency in LM2696MXA?
The RON pin draws a current (0.65 V bias) that sets on-time via TON = kON × RON / (VIN − VD). With kON = 66 µA·µs and VD ≈ 0.65 V, selecting RON = 100 kΩ at VIN = 12 V yields TON ≈ 600 ns and fSW ≈ 300 kHz in CCM. Frequency scales inversely with RON and remains constant across VIN due to feed-forward.
Is LM2696MXA pin-compatible with LM2696MX/NOPB?
Yes. LM2696MXA and LM2696MX/NOPB share identical HTSSOP-16 (PWP0016A) package, pinout, electrical specifications, and thermal characteristics. The "A" suffix denotes enhanced manufacturing flow and is functionally and mechanically interchangeable with the base LM2696MX/NOPB part.
What is the maximum allowable ripple on the AVIN pin for stable LM2696MXA operation?
The AVIN pin must be bypassed with a 1 µF X5R/X7R ceramic capacitor placed adjacent to the pin. Excessive ripple (>50 mVpp) risks comparator noise, regulation error, or PGOOD false triggering. AVIN should never fall below 4.5 V or exceed 26 V, and must remain ≥ PVIN at all times.
LM2696MXA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
LM2696MXA FAQ
1.How can I place an order for LM2696MXA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2696MXA 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 LM2696MXA reliable?
The price and inventory of LM2696MXA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2696MXA is usually 5 days.
3.What payment methods are accepted for LM2696MXA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2696MXA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2696MXA?
LM2696MXA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2696MXA 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 LM2696MXA?
For technical support, including LM2696MXA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2696MXA requirements.
6.How does Aetrix verify that LM2696MXA is sourced from the original manufacturer or authorized distributors?
All LM2696MXA 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 LM2696MXA meets industry standards.
7.What is the process for return or replacement of LM2696MXA?
All LM2696MXA units undergo pre-shipment inspection (PSI). If there is an issue with LM2696MXA, 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 LM2696MXA part is unused and in its original packaging.
Return procedure for LM2696MXA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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