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Texas Instruments LM2698MMX-ADJ/NOPB
- Part No.:
- LM2698MMX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2698MMX-ADJ/NOPB.pdf
- Description:
- IC REG BST SEPIC ADJ 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,433
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Product details
Overview
LM2698MMX-ADJ/NOPB from Texas Instruments is a current-mode PWM boost regulator IC with an integrated 1.9A/0.2Ω MOSFET switch, operating from 2.2V to 12V input and delivering up to 17V output. It supports adjustable switching frequencies of 600kHz or 1.25MHz, features external compensation (VC pin), shutdown control (SHDN), and delivers 400mA at 12V from a 5V source in typical applications such as DSL modems and diagnostic instrumentation.
For engineers reviewing the LM2698MMX-ADJ/NOPB datasheet, LM2698MMX-ADJ/NOPB pinout, LM2698MMX-ADJ/NOPB application, or LM2698MMX-ADJ/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed key specifications including feedback voltage (1.26V), switch RDS(ON) (0.2Ω), and thermal resistance (200°C/W), plus real-world design constraints for boost, SEPIC, and flyback topologies.
Technical Context
The LM2698MMX-ADJ/NOPB implements current-mode PWM control with internal slope compensation, enabling stable operation across 2.2V–12V input and supporting duty cycles up to 85%. Its error amplifier (transconductance 40–290 µmho, gain 120 V/V) interfaces with an external RC network on the VC pin for loop compensation, allowing use of low-ESR ceramic output capacitors.
Switching frequency is selected via FSLCT pin (ground = 600kHz, VIN = 1.25MHz), and the device includes under-voltage lockout (UVP thresholds 1.85–2.2V), thermal shutdown, and over-current protection referenced to peak switch current (1.35–2.4A). The NC pin must be grounded per layout guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 12V - supports single-cell Li-ion, 3.3V/5V rails, and industrial 12V inputs without pre-regulation |
| Output Voltage Range | 2.2V to 17V - adjustable via FB resistor divider; no internal reference clamp beyond feedback node |
| Switch Current Limit | 1.35A (min) to 2.4A (max) - sets maximum deliverable load current depending on VIN, duty cycle, and inductor ripple |
| Feedback Voltage | 1.2285V to 1.2915V - precise 1.26V nominal reference enables ±2.5% output regulation accuracy |
| Switch RDS(ON) | 0.2Ω (typical at VIN = 2.7V, ISW = 1A) - determines conduction loss and thermal rise at high load currents |
| Quiescent Current | 1.3mA (typical, active) / 5µA (typical, shutdown) - defines light-load efficiency and standby power budget |
| Thermal Resistance θJA | 195°C/W (with optimized PCB copper) - requires ≥0.25 in² ground plane and thermal vias for 400mA continuous output |
Pinout & Package
LM2698MMX-ADJ/NOPB uses an 8-lead VSSOP (DGK) package with 0.65mm pitch and exposed thermal pad (not electrically connected). Pin 8 (NC) must be soldered to ground for mechanical stability and EMI reduction per TI layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VC | Compensation network connection | Interface to external RC network for loop stability; connects to error amplifier output |
| 2 - FB | Output voltage feedback input | Senses resistive divider ratio; 1.26V reference sets VOUT = 1.26 × (1 + RFB1/RFB2) |
| 3 - SHDN | Active-low shutdown control | Pulls <0.6V to reduce quiescent current to 5µA; open-circuit or >0.9V enables operation |
| 4 - GND | Analog and power ground | Common return for feedback, compensation, and power paths; must tie to low-impedance ground plane |
| 5 - SW | Switch node | Drives external inductor/diode; carries high di/dt pulses; requires short, wide trace and local ceramic bypass |
| 6 - VIN | Analog power input | Bias supply for internal circuitry; requires 0.1µF–0.22µF ceramic capacitor placed <2mm from pin |
| 7 - FSLCT | Frequency select input | Ground = 600kHz; connect to VIN = 1.25MHz - sets minimum off-time and inductor sizing requirements |
| 8 - NC | No-connect (ground recommended) | Mechanical anchor and EMI shield; TI specifies grounding for thermal and noise performance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.9A/18V MOSFET switch | Eliminates external high-side switch; enables compact 5V-to-12V boost designs with ≤400mA output |
| Adjustable 600kHz/1.25MHz switching | Enables trade-off between inductor size (smaller at 1.25MHz) and efficiency (higher at 600kHz) |
| External compensation (VC pin) | Allows full control over loop bandwidth and phase margin using standard RC components |
| Current-mode control architecture | Provides inherent line/load regulation and simplifies compensation vs. voltage-mode controllers |
| Shutdown quiescent current ≤5µA | Supports battery-powered systems requiring ultra-low standby power during sleep modes |
Applications
| DSL Modem Power Supply | Diagnostic Medical Instrumentation |
|---|---|
Use Scenario: Generating isolated 12V rail from 5V system bus to power ADSL line drivers and analog front-end circuitry. IC Role / Device Role / Timing Role: Primary DC-DC boost regulator providing regulated 12V output with fast transient response to burst-mode line signaling. Use Value: Delivers 400mA at 12V from 5V input with <85% efficiency; adjustable frequency avoids interference with DSL band signals. |
Use Scenario: Powering precision analog sensors and ADC references in portable ultrasound or ECG devices from 3.3V battery sources. IC Role / Device Role / Timing Role: High-stability boost converter supplying low-noise 5V or 10V rails for signal conditioning stages. Use Value: 1.26V feedback reference and current-mode control ensure <±2.5% output regulation across temperature and load variation. |
| Set-Top Box Auxiliary Rail | Industrial IoT Sensor Node |
Use Scenario: Creating 5V auxiliary supply from 12V main rail to power HDMI PHY, IR receiver, and microcontroller peripherals. IC Role / Device Role / Timing Role: Efficient non-isolated boost converter operating in discontinuous conduction mode during low-power standby. Use Value: 5µA shutdown current extends standby time; 85% max duty cycle supports 5V-out-from-12V-in with negative voltage conversion via SEPIC variant. |
Use Scenario: Boosting 2.5V–3.3V from coin-cell or energy-harvesting source to 3.3V/5V for wireless transceivers and MCU core logic. IC Role / Device Role / Timing Role: Low-input-voltage capable regulator enabling direct battery coupling without intermediate LDO stage. Use Value: 2.2V minimum input allows operation down to near-dead battery; 600kHz option optimizes efficiency at light loads typical of sensor sampling bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 5.5A switch current, fixed 500kHz/1.2MHz frequency, no VC pin - fully integrated compensation | Preferred for >1A output or space-constrained layouts; lacks external loop tuning capability | Select when higher output current or simplified design is prioritized over loop optimization flexibility |
| LT3467EDD#TRPBF | 2.5A switch, 1.3MHz fixed frequency, integrated soft-start, no FSLCT pin - requires different compensation approach | Better suited for noise-sensitive analog systems due to spread-spectrum option; no dual-frequency selection | Choose for applications needing guaranteed EMI performance or where 1.3MHz fixed timing aligns with system clock domains |
Compared with TPS61088RHLR and LT3467EDD#TRPBF, LM2698MMX-ADJ/NOPB offers unique external compensation and dual-frequency selection for custom loop shaping and EMI mitigation, making it optimal for designs requiring precise transient response tuning or multi-rail synchronization.
Availability
LM2698MMX-ADJ/NOPB is available at Aetrix Electronics and suitable for DSL modems, diagnostic medical instrumentation, set-top boxes, and industrial IoT sensor nodes requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2698MMX-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 power conversion ICs.
The LM2698 product line delivers SIMPLE SWITCHER® boost regulators designed for cost-sensitive, space-constrained applications requiring robust performance across industrial, communications, and medical equipment - emphasizing ease of design, thermal resilience, and topology flexibility (boost/SEPIC/flyback).
FAQ
What is the minimum input voltage supported by the LM2698MMX-ADJ/NOPB?
The LM2698MMX-ADJ/NOPB operates down to 2.2V input, enabling direct interface with single-cell Li-ion batteries or low-voltage logic rails. At 2.2V, the device maintains regulation up to its maximum duty cycle (85%), and the internal switch RDS(ON) increases slightly but remains within specification. This minimum is confirmed in the Electrical Characteristics table under Operating Conditions.
How does the FSLCT pin affect the LM2698MMX-ADJ/NOPB's switching frequency?
The FSLCT pin selects between two fixed switching frequencies: grounding the pin sets 600kHz operation, while connecting it to VIN selects 1.25MHz. This choice directly impacts inductor sizing (smaller at 1.25MHz), output capacitor RMS current, and EMI profile. Frequency tolerance is ±20% at 600kHz and ±25% at 1.25MHz per the Electrical Characteristics table.
Can the LM2698MMX-ADJ/NOPB be used in SEPIC topology?
Yes, the LM2698MMX-ADJ/NOPB supports SEPIC configurations as documented in Figures 21 and 22 of the datasheet. Its current-mode control, external compensation, and high-voltage switch (18V rating) allow stable operation in both step-up and step-down modes. Design requires two matched inductors and proper CSEPIC selection per TI application guidance.
What is the purpose of the NC pin on the LM2698MMX-ADJ/NOPB?
Pin 8 is designated NC (no internal connection), but Texas Instruments explicitly recommends grounding it in the Connection Diagram and Layout Considerations section. Grounding improves mechanical stability, reduces EMI susceptibility, and enhances thermal dissipation through the exposed pad - not for electrical functionality, but for robust PCB implementation.
What output voltage accuracy can be expected from the LM2698MMX-ADJ/NOPB?
The LM2698MMX-ADJ/NOPB guarantees a feedback reference voltage of 1.2285V to 1.2915V (±2.5% around 1.26V) across −40°C to +125°C. Combined with resistor divider tolerance, total output accuracy is typically ±3–4% for standard 1% FB resistors. Line regulation contributes ≤0.1%/V, and load regulation is maintained via current-mode control.
LM2698MMX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.2V
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 2.2V
- Voltage - Output (Max):
- 17.5V
- Current - Output:
- 1.35A (Switch)
- Frequency - Switching:
- 600kHz, 1.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LM2698MMX-ADJ/NOPB FAQ
1.How can I place an order for LM2698MMX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2698MMX-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 LM2698MMX-ADJ/NOPB reliable?
The price and inventory of LM2698MMX-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 LM2698MMX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2698MMX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2698MMX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2698MMX-ADJ/NOPB?
LM2698MMX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2698MMX-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 LM2698MMX-ADJ/NOPB?
For technical support, including LM2698MMX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2698MMX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2698MMX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2698MMX-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 LM2698MMX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2698MMX-ADJ/NOPB?
All LM2698MMX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2698MMX-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 LM2698MMX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2698MMX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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