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Texas Instruments LM2698MM-ADJ
- Part No.:
- LM2698MM-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2698MM-ADJ.pdf
- Description:
- IC REG BST SEPIC ADJ 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,703
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Product details
Overview
LM2698MM-ADJ 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 via the FSLCT pin, features external compensation (VC pin), and delivers 400mA at 12V from a 5V input in typical applications such as DSL modems and diagnostic instrumentation.
For engineers reviewing the LM2698MM-ADJ datasheet, LM2698MM-ADJ pinout, LM2698MM-ADJ application, or LM2698MM-ADJ equivalent, key selection considerations include its adjustable frequency select (FSLCT), feedback voltage tolerance (1.2285–1.2915 V), shutdown quiescent current (5–10 µA), internal switch RDS(ON) (0.2 Ω typ), and thermal resistance (200–235 °C/W depending on PCB layout).
Technical Context
The LM2698MM-ADJ implements current-mode control architecture for superior line/load regulation and simplified loop compensation across its full 2.2V–12V input range. Its internal 18V-rated, 1.9A switch enables efficient step-up conversion to outputs up to 17V, with duty cycle limited to 78–85% depending on FSLCT state.
It integrates a bandgap reference, error amplifier (transconductance 40–290 µmho), oscillator with dual-frequency selection, overvoltage/undervoltage protection comparators, and thermal shutdown. The VC pin provides direct access to the error amplifier output for custom compensation networks using RC and CC components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2 V to 12 V - supports single-cell Li-ion, 3.3 V, and 5 V rails without pre-regulation |
| Output Voltage Range | 2.2 V to 17 V - set externally via FB resistor divider; no fixed-output variants |
| Switch Current Limit | 1.35 A (min) to 2.4 A (max) - limits peak inductor current to prevent saturation and thermal overload |
| Feedback Voltage | 1.2285 V to 1.2915 V - defines output accuracy; sets VOUT = VFB × (1 + RFB1/RFB2) |
| Switching Frequency | 480–720 kHz (FSLCT = GND) or 1–1.5 MHz (FSLCT = VIN) - selects trade-off between efficiency and component size |
| RDS(ON) | 0.2 Ω (typ) at VIN = 2.7 V, ISW = 1 A - determines conduction loss and thermal rise under load |
| Shutdown Current | 5 µA (typ) - enables ultra-low-power standby in battery-powered systems |
Pinout & Package
LM2698MM-ADJ is housed in an 8-lead VSSOP (DGK) package - low-profile, surface-mount, with exposed thermal pad (not electrically connected). Pin 8 is NC and must be grounded per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC) | Compensation network node | Connects external RC/CC network to stabilize control loop; directly drives error amplifier output |
| 2 (FB) | Feedback input | Senses output voltage via resistor divider; regulates VOUT to 1.26 V nominal |
| 3 (SHDN) | Active-low enable | Pull ≤0.6 V to disable IC; reduces quiescent current to 5 µA |
| 4 (GND) | Analog & power ground | Common return for feedback, compensation, and power paths; requires low-impedance PCB connection |
| 5 (SW) | Switch node | Drives external inductor/diode; carries high di/dt; must minimize trace inductance |
| 6 (VIN) | Power input | Supplies internal bias and switch driver; requires local 0.1–1 µF ceramic bypass capacitor |
| 7 (FSLCT) | Frequency select | GND = 600 kHz; VIN = 1.25 MHz - configures oscillator without external components |
| 8 (NC) | No connect | Must be tied to GND per TI recommendation to reduce noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.9A/0.2Ω MOSFET switch | Eliminates external high-current switch; reduces BOM count and layout complexity for compact boost designs |
| Dual selectable switching frequency | 600 kHz or 1.25 MHz via single FSLCT pin - enables optimization for EMI, efficiency, or size without redesign |
| External compensation (VC pin) | Allows full control over loop dynamics using RC/CC network - supports ceramic output capacitors with low ESR |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and stable operation across wide input/output ranges |
| Undervoltage lockout (UVP) | Enables only above 1.95 V (typ), disables below 1.85 V - prevents erratic startup during brownout conditions |
Applications
| DSL Modem Power Supply | Diagnostic Medical Instrumentation |
|---|---|
Use Scenario: Generating 12 V rail from 5 V main supply in compact DSL modem chassis with strict EMI limits. IC Role / Device Role / Timing Role: Primary DC-DC boost converter regulating output via FB pin; FSLCT set to 1.25 MHz to shrink inductor/capacitor size. Use Value: Delivers 400 mA at 12 V with >85% efficiency; high-frequency operation avoids audible noise and eases filtering. |
Use Scenario: Providing isolated, stable 10 V bias for precision analog front-end sensors in portable diagnostic devices. IC Role / Device Role / Timing Role: Adjustable-output boost regulator with tight VFB tolerance (±2.5%) ensuring sensor reference stability. Use Value: Maintains <±1% output regulation across 2.2–12 V input range and −40°C to +125°C junction temperature. |
| Set-Top Box Auxiliary Rail | SEPIC Converter for Wide-Input Systems |
Use Scenario: Deriving 5 V auxiliary supply from 3.3 V logic rail in space-constrained set-top box PCB. IC Role / Device Role / Timing Role: Efficient step-up converter with shutdown control (SHDN) enabling dynamic power gating during standby. Use Value: Achieves 400 mA output with 5 µA shutdown current - extends system standby time without compromising wake-up latency. |
Use Scenario: Implementing non-inverting buck-boost (SEPIC) topology where input may dip below or rise above output (e.g., 3.3 V ±20%). IC Role / Device Role / Timing Role: Core controller in SEPIC configuration using SW and GND pins; supports both standard and level-shifted topologies. Use Value: Enables single-chip solution for wide-input-range supplies without requiring isolated controllers or additional MOSFETs. |
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-A switch current, fixed 500-kHz/2-MHz frequency, no FSLCT pin; requires external compensation only for advanced tuning | Better suited for >1-A loads and higher-efficiency 3.3V→12V conversion; lacks manual frequency select flexibility | Choose TPS61088RHLR when output current exceeds 400 mA or when higher integration (no VC network needed) is prioritized |
| LT3467EMS#TRPBF | Fixed 1.3-MHz frequency, 1.3-A switch, integrated soft-start, no UVP; uses different compensation scheme (Type II vs. LM2698's Type III) | Optimized for low-noise, fast-transient applications like imaging sensors; lacks shutdown current spec <10 µA | Choose LT3467EMS#TRPBF when design requires guaranteed soft-start and minimal output overshoot, not ultra-low shutdown IQ |
Compared with TPS61088RHLR and LT3467EMS#TRPBF, LM2698MM-ADJ uniquely balances adjustable frequency, precise FB tolerance, and ultra-low shutdown current - making it optimal for cost-sensitive, moderate-current, and thermally constrained boost applications where layout flexibility and design reuse matter.
Availability
LM2698MM-ADJ is available at Aetrix Electronics and suitable for DSL modems, diagnostic medical instrumentation, set-top boxes, and SEPIC-based industrial power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LM2698MM-ADJ 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 ease of use, high power density, and robust operation in consumer, industrial, and medical applications - emphasizing pin-compatible scalability and software-assisted design.
FAQ
What is the minimum input voltage required for stable operation of the LM2698MM-ADJ?
The LM2698MM-ADJ operates stably down to 2.2 V input, as confirmed by absolute maximum ratings and electrical characteristics tables. Below this threshold, undervoltage lockout (UVP) disables the device - activation occurs at 1.95 V (typ), with hysteresis ensuring clean turn-on. This makes LM2698MM-ADJ suitable for single-cell Li-ion (2.7–4.2 V) and low-voltage logic rails.
How does the FSLCT pin affect the switching frequency of the LM2698MM-ADJ?
The FSLCT pin selects between two factory-trimmed oscillator frequencies: grounding FSLCT sets 600 kHz (480–720 kHz range), while connecting it to VIN selects 1.25 MHz (1–1.5 MHz range). This selection is digital and does not require resistors or timing components - enabling rapid optimization of inductor size, output ripple, and EMI behavior without circuit changes.
Can the LM2698MM-ADJ be used in SEPIC topology, and what design constraints apply?
Yes, the LM2698MM-ADJ supports SEPIC configurations as documented in Figures 21–22 of the datasheet. Critical constraints include matching L1 and L2 inductance values to avoid subharmonic oscillation, using ceramic CSEPIC due to polarity reversal, and ensuring total switch current (I1+I2+Δi1+Δi2) stays within the 1.35–2.4 A current limit. LM2698MM-ADJ's current-mode control ensures stable SEPIC operation without added compensation complexity.
What is the purpose of the NC pin (Pin 8) on the LM2698MM-ADJ, and how should it be handled?
Pin 8 is designated NC (No Connect) but must be connected to GND per TI's official recommendation in the SNVS153E datasheet. This grounding reduces noise coupling into the IC's sensitive analog sections - particularly the error amplifier and reference - and improves immunity to EMI in high-frequency boost applications. Leaving Pin 8 floating is not advised and may degrade regulation accuracy or stability.
Does the LM2698MM-ADJ include thermal protection, and how does it behave under overload?
Yes, the LM2698MM-ADJ incorporates thermal shutdown that activates at 150°C junction temperature. When triggered, the device halts switching and enters a safe high-impedance state until die temperature falls below the hysteresis threshold (~135°C). During normal operation, power dissipation is internally limited and depends on θJA (200–235 °C/W), ambient temperature, and load - requiring appropriate PCB copper area per TI's layout guidelines to sustain 400 mA continuous output.
LM2698MM-ADJ 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
LM2698MM-ADJ FAQ
1.How can I place an order for LM2698MM-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2698MM-ADJ 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 LM2698MM-ADJ reliable?
The price and inventory of LM2698MM-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2698MM-ADJ is usually 5 days.
3.What payment methods are accepted for LM2698MM-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2698MM-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2698MM-ADJ?
LM2698MM-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2698MM-ADJ 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 LM2698MM-ADJ?
For technical support, including LM2698MM-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2698MM-ADJ requirements.
6.How does Aetrix verify that LM2698MM-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2698MM-ADJ 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 LM2698MM-ADJ meets industry standards.
7.What is the process for return or replacement of LM2698MM-ADJ?
All LM2698MM-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2698MM-ADJ, 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 LM2698MM-ADJ part is unused and in its original packaging.
Return procedure for LM2698MM-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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