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Texas Instruments LM2717MTX-ADJ
- Part No.:
- LM2717MTX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2717MTX-ADJ.pdf
- Description:
- IC REG BUCK ADJ DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,934
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Product details
Overview
LM2717MTX-ADJ from Texas Instruments is a dual adjustable synchronous step-down DC/DC converter IC with two integrated high-current MOSFET switches (2.2A Buck 1 and 3.2A Buck 2), operating from 4V to 20V input, delivering independently regulated outputs down to 1.267V, and featuring pin-adjustable 300–600kHz switching frequency - used in TFT-LCD power rails and portable computing power management.
For engineers reviewing the LM2717MTX-ADJ datasheet, LM2717MTX-ADJ pinout, LM2717MTX-ADJ application, or LM2717MTX-ADJ equivalent, key selection criteria include per-channel shutdown control, external soft-start timing, thermal shutdown, input undervoltage lockout, and TSSOP-24 package compatibility with high-density PCB layouts.
Technical Context
The LM2717MTX-ADJ integrates two independent current-mode PWM buck regulators sharing a common input but with separate feedback, compensation, soft-start, and shutdown pins. Each channel employs internal 0.16Ω MOSFETs and supports adjustable output via resistor-divider feedback referencing a 1.258V bandgap voltage.
It uses a single FSLCT pin to set switching frequency across both channels via an external resistor (46.4kΩ for 300kHz, 22.6kΩ for 600kHz), while maintaining independent duty-cycle control up to 93% and built-in protection including overtemperature shutdown, input UVLO (3.8V on, 3.3V off), and output overvoltage detection at the FB pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 20V - supports wide-input industrial and automotive supply rails without pre-regulation. |
| Buck 1 Output Current | 2.2A continuous - enables core logic or memory rail generation in portable systems. |
| Buck 2 Output Current | 3.2A continuous - suitable for higher-power subsystems like display backlight drivers or I/O rails. |
| Feedback Reference Voltage | 1.258V ±20mV - sets precise output voltage with standard resistor-divider networks. |
| Switching Frequency Range | 300kHz to 600kHz - adjustable via single external resistor for EMI optimization and inductor size trade-offs. |
| Thermal Shutdown Threshold | 150°C junction - protects against sustained overload or poor heatsinking in compact enclosures. |
| Quiescent Current | 6mA typical (both channels active) - minimizes standby power loss in battery-powered applications. |
Pinout & Package
LM2717MTX-ADJ is housed in a thermally enhanced 24-lead TSSOP package (JEDEC MO-153, 7.8mm × 4.4mm × 1.2mm), with dedicated AGND and PGND pins requiring direct low-inductance connection at the package for stable regulation and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1,2,11,12) | Power ground return | Carries high-frequency switch currents; must be tied directly to AGND at package for minimal loop inductance. |
| AGND (Pins 3,9,10) | Analog ground reference | Reference for error amplifiers, bandgap, and feedback circuitry; sensitive to noise coupling. |
| FB1 / FB2 (Pins 4,8) | Voltage feedback inputs | Monitor regulated outputs via resistor dividers; trip OVP if disconnected or open-circuited. |
| SHDN1 / SHDN2 (Pins 21,17) | Active-low shutdown controls | Enable independent channel disable; compatible with 1.8V logic; pull high via resistor to enable. |
| SS1 / SS2 (Pins 20,18) | Soft-start timing inputs | Control ramp-up of current limit via external capacitor; prevent inrush into downstream capacitance. |
| FSLCT (Pin 19) | Frequency select input | Resistor-to-ground sets oscillator frequency for both channels simultaneously (300–600kHz). |
| SW1 / SW2 (Pins 24,13) | High-side switch node outputs | Drive external inductors and bootstrap diodes; require low-ESR ceramic capacitors for gate drive stability. |
| VIN (Pins 14,15,23) | Main power input | All three VIN pins are internally bonded; must be connected together with low-impedance path to bulk input capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulation | Enables simultaneous generation of two different output voltages (e.g., 3.3V + 5V or 1.8V + 12V) from one input source. |
| 0.16Ω internal MOSFETs (Buck 1 & 2) | Reduces conduction losses and eliminates need for external high-side switches, simplifying BOM and layout. |
| Per-channel soft-start and shutdown | Allows sequencing control for multi-rail systems and reduces stress during power-up or fault recovery. |
| Input UVLO with hysteresis (3.8V on / 3.3V off) | Prevents erratic operation during brown-out conditions and ensures clean start-up above minimum functional voltage. |
| Bandgap-referenced 1.258V feedback | Provides stable output voltage accuracy across temperature (−40°C to +125°C) and line variations. |
Applications
| TFT-LCD Display Power | Laptop Core Voltage Regulation |
|---|---|
Use Scenario: Powers gate driver (VGH/VGL) and source driver (AVDD) rails in active-matrix LCD panels. IC Role / Device Role / Timing Role: Dual-buck regulator providing isolated, sequenced 15V and −10V (via charge pump assist) or 3.3V/5V rails with tight ripple control. Use Value: Enables fast panel startup via independent SS1/SS2 control and maintains stable VCOM bias under dynamic image loads. | Use Scenario: Generates CPU core (1.2V) and system I/O (3.3V) rails in space-constrained notebook motherboards. IC Role / Device Role / Timing Role: Primary dual-output PMIC delivering high-efficiency conversion with thermal foldback during sustained load bursts. Use Value: Achieves >90% efficiency at 12V input and 2A load, reducing thermal load on thin-profile heat sinks. |
| Automotive Infotainment Supply | Handheld Device Main Power |
Use Scenario: Supplies 5V USB host port and 3.3V MCU/SOC rails in vehicle head units exposed to 12V battery transients. IC Role / Device Role / Timing Role: Input-tolerant buck controller handling cold-crank (4.5V) to load-dump (20V) conditions with UVLO and thermal protection. Use Value: Maintains regulation through ISO 7637-2 Pulse 4 (cold crank) without dropout or reset, ensuring system continuity. | Use Scenario: Powers application processor, memory, and peripheral interfaces in ruggedized handheld test equipment. IC Role / Device Role / Timing Role: Dual-channel power manager supporting dynamic voltage scaling and independent rail shutdown during sleep modes. Use Value: Reduces system quiescent current to <10µA in full shutdown (both SHDN pins asserted), extending battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual adjustable buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54290PWPR | Higher 2.5A/3.5A current rating; 500kHz fixed frequency; no FSLCT pin; requires external compensation. | Designed for telecom/datacom; lacks independent soft-start pins and UVLO hysteresis. | Choose when higher current and fixed-frequency EMI control outweigh need for per-channel sequencing. |
| MP2491DS-LF-Z | Single-channel only; 3A output; 2.5V–28V input; no thermal shutdown; smaller SOIC-8 package. | Targeted at cost-sensitive consumer electronics; no dual-output capability or independent shutdown. | Use only when replacing one channel of LM2717MTX-ADJ; requires second IC for dual-rail designs. |
Compared with TPS54290PWPR and MP2491DS-LF-Z, the LM2717MTX-ADJ uniquely provides per-channel soft-start, shutdown, and shared frequency adjustment in a single TSSOP-24 package - critical for compact, sequenced, and thermally constrained dual-rail systems.
Availability
LM2717MTX-ADJ is available at Aetrix Electronics and suitable for TFT-LCD displays, laptop computers, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2717MTX-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 ICs, with decades of expertise in high-efficiency DC/DC conversion and automotive-grade reliability.
The LM2717MTX-ADJ belongs to TI's legacy high-current dual buck regulator product line, engineered specifically for portable and display power applications demanding independent rail control, thermal robustness, and wide-input operation.
FAQ
What is the minimum output voltage achievable with LM2717MTX-ADJ?
The LM2717MTX-ADJ supports output voltages as low as 1.267V, determined by its internal 1.258V feedback reference voltage and resistor-divider ratio. This allows precise generation of modern low-voltage rails such as 1.2V for processors or 1.8V for memory interfaces, provided external components meet stability and ripple requirements.
Does LM2717MTX-ADJ support independent frequency adjustment for each buck channel?
No, LM2717MTX-ADJ does not support independent frequency adjustment. Both buck channels share a single FSLCT pin, meaning the switching frequency (300–600kHz) is set identically for Buck 1 and Buck 2 using one external resistor. This simplifies design but prevents channel-specific EMI tuning.
Can LM2717MTX-ADJ operate with input voltage below 4V?
No, LM2717MTX-ADJ has a specified minimum input voltage of 4V per the absolute maximum ratings and operating conditions. Below this threshold, the device enters undervoltage lockout (UVLO) and ceases regulation. The UVLO turns on at 3.8V and releases hysteresis at 3.3V, preventing oscillation near the lower limit.
How is thermal protection implemented in LM2717MTX-ADJ?
LM2717MTX-ADJ incorporates a dedicated thermal shutdown circuit that disables both buck converters when the junction temperature reaches approximately 150°C. Recovery occurs only after die temperature falls below the hysteresis threshold (~140°C), ensuring safe cooldown before resuming operation - a critical safeguard in sealed or high-ambient environments.
What is the purpose of the multiple PGND and AGND pins on LM2717MTX-ADJ?
The LM2717MTX-ADJ features four PGND and three AGND pins to separate high-current power return paths from sensitive analog reference grounds. PGND carries pulsed switch currents, while AGND serves error amplifiers and bandgap circuits. They must be tied together directly at the package to minimize noise coupling and ensure stable feedback loop performance.
LM2717MTX-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 1.258V
- Voltage - Output (Max):
- 18.6V
- Current - Output:
- 2.2A, 3.2A
- Frequency - Switching:
- 300kHz ~ 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
LM2717MTX-ADJ FAQ
1.How can I place an order for LM2717MTX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2717MTX-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 LM2717MTX-ADJ reliable?
The price and inventory of LM2717MTX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2717MTX-ADJ is usually 5 days.
3.What payment methods are accepted for LM2717MTX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2717MTX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2717MTX-ADJ?
LM2717MTX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2717MTX-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 LM2717MTX-ADJ?
For technical support, including LM2717MTX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2717MTX-ADJ requirements.
6.How does Aetrix verify that LM2717MTX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2717MTX-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 LM2717MTX-ADJ meets industry standards.
7.What is the process for return or replacement of LM2717MTX-ADJ?
All LM2717MTX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2717MTX-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 LM2717MTX-ADJ part is unused and in its original packaging.
Return procedure for LM2717MTX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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