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Texas Instruments LM2717MTX
- Part No.:
- LM2717MTX
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2717MTX.pdf
- Description:
- IC REG BUCK 3.3V DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,876
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Product details
Overview
LM2717MTX from Texas Instruments is a dual synchronous step-down DC/DC converter IC integrating two independent buck regulators: one fixed 3.3V/2.2A output and one adjustable 1.267V–20V/3.2A output, operating from 4V–20V input, used in portable power rails for TFT-LCD displays and laptop core logic.
For engineers reviewing the LM2717MTX datasheet, LM2717MTX pinout, LM2717MTX application, or LM2717MTX equivalent, this page delivers verified electrical parameters, TSSOP-24 package layout guidance, thermal shutdown behavior, frequency-select resistor design, and soft-start capacitor sizing - all confirmed from TI's SNVS253D revision March 2013 datasheet.
Technical Context
The LM2717MTX implements two current-mode PWM buck regulators with separate error amplifiers (gm1 = 1340 µmho, gm2 = 1360 µmho), independent shutdown (SHDN1/SHDN2), and soft-start (SS1/SS2) pins. Each regulator uses a 0.16Ω internal N-channel MOSFET switch and supports 300kHz–600kHz switching via external FSLCT resistor.
It features dedicated protection circuitry including input undervoltage lockout (UVP threshold: 3.8V on, 3.3V off), overtemperature shutdown (TJ = 150°C), and output overvoltage detection. Ground separation (PGND/AGND) is enforced with direct tie-at-package routing to minimize noise coupling into feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 20V - supports wide-input industrial and battery-powered systems without pre-regulation. |
| Fixed Output Voltage | 3.3V ±0% - internally trimmed; no external feedback required for first rail. |
| Adjustable Output Range | 1.267V to 20V - set by resistor divider on FB2; 1.267V feedback reference enables low-VOUT designs. |
| Switch RDS(ON) | 0.16Ω (both channels) - reduces conduction loss at high load currents up to 3.2A. |
| Switching Frequency | 300kHz to 600kHz - externally adjustable via FSLCT pin; enables optimization of size vs. efficiency. |
| Thermal Shutdown Threshold | 150°C junction temperature - automatically disables both regulators to prevent damage. |
| Quiescent Current | 6mA typical (both regulators active) - balances light-load efficiency and response speed. |
Pinout & Package
LM2717MTX is housed in a 24-lead TSSOP package (TI package code PW0024A), 7.8mm × 4.4mm × 1.2mm profile, RoHS-compliant, moisture sensitivity level 1, lead finish Sn.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2,11,12,PGND | Power ground | Return path for high-current switch nodes SW1/SW2; must be tied directly to AGND at package. |
| 3,9,10,AGND | Analog ground | Reference for FB1/FB2, VC1/VC2, VBG; requires separate low-noise trace to PGND tie point. |
| 4,FB1 | Fixed-buck feedback | Monitors 3.3V output; internal 3.3V reference eliminates need for external divider. |
| 5,VC1 | Fixed-buck compensation | Connects to output of error amplifier; used for loop stability tuning with RC network. |
| 7,VC2 | Adjustable-buck compensation | Same function as VC1 but for second regulator; independent compensation per channel. |
| 8,FB2 | Adjustable-buck feedback | Senses output voltage; 1.267V reference sets VOUT = 1.267V × (1 + RFB1/RFB2). |
| 13,SW2 | Adjustable-buck switch node | Drives external inductor; connects between VIN and L2; requires low-inductance layout. |
| 14,15,23,VIN | Input power supply | Three parallel VIN pins reduce IR drop; must be shorted together near input capacitor. |
| 16,CB2 | Adjustable-buck bootstrap | Supplies gate drive for high-side switch; requires ≥4.7nF ceramic capacitor. |
| 17,SHDN2 | Adjustable-buck shutdown | Active-low control; <1.33V disables regulator; open-circuit defaults to enabled. |
| 18,SS2 | Adjustable-buck soft-start | Charged by 9µA current; CSS value sets startup time: TSS ≈ CSS × 0.6V / 9µA. |
| 19,FSLCT | Frequency select | Resistor-to-ground sets fSW: 46.4kΩ → 300kHz, 22.6kΩ → 600kHz. |
| 20,SS1 | Fixed-buck soft-start | Same function as SS2 but for 3.3V rail; independent timing control per channel. |
| 21,SHDN1 | Fixed-buck shutdown | Active-low; identical logic to SHDN2; allows independent enable/disable of each regulator. |
| 22,CB1 | Fixed-buck bootstrap | Same role as CB2; requires dedicated 4.7nF+ ceramic capacitor. |
| 24,SW1 | Fixed-buck switch node | Drives L1 for 3.3V rail; layout symmetry with SW2 critical for EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulation | Enables simultaneous 3.3V system rail and programmable core voltage (e.g., 5V/12V/15V) from single input. |
| 0.16Ω internal MOSFETs | Reduces full-load conduction loss by >30% vs. typical 0.25Ω competitors at 3A, improving thermal margin. |
| Separate AGND/PGND pins | Prevents switching noise from corrupting feedback signals; mandatory direct tie at package for stable regulation. |
| Independent soft-start and shutdown | Allows staggered power-up sequencing (e.g., 3.3V before adjustable rail) and dynamic rail disabling for power gating. |
| 300–600kHz adjustable frequency | Permits use of smaller magnetics and capacitors while avoiding AM radio band; resistor-based tuning simplifies BOM. |
Applications
| TFT-LCD Display Power | Laptop Core Voltage Regulation |
|---|---|
|
Use Scenario: Dual-rail power for LCD panel logic (3.3V) and gate driver (12–15V) in notebook displays. IC Role / Device Role / Timing Role: Primary DC/DC controller generating both rails from main battery or adapter input. Use Value: Eliminates need for two discrete converters; 0.16Ω RDS(ON) sustains >90% efficiency at 1.5A/15V under 12V input. |
Use Scenario: Generating CPU I/O voltage (3.3V) and configurable core voltage (adjustable) in portable computing. IC Role / Device Role / Timing Role: Dual-output PMIC delivering sequenced, independently controlled power domains. Use Value: Independent SHDN1/SHDN2 pins enable dynamic core voltage scaling; soft-start prevents inrush during mode transitions. |
| Handheld Device Baseband Power | Portable Medical Instrumentation |
|
Use Scenario: Powering baseband processor (3.3V) and RF front-end bias (adjustable 2.8–4.2V) in cellular handsets. IC Role / Device Role / Timing Role: Compact dual-buck solution meeting tight PCB area constraints and EMI requirements. Use Value: 600kHz max switching frequency allows <10µH inductors; TSSOP-24 footprint fits sub-20mm² layouts. |
Use Scenario: Supplying isolated analog sensor rails (3.3V) and digital processing core (adjustable 1.8V) in battery-operated diagnostics tools. IC Role / Device Role / Timing Role: Precision dual regulator with thermal shutdown and UVP ensuring safe operation during battery depletion. Use Value: −40°C to +125°C operating range supports clinical environments; 3.3V rail accuracy (±0%) ensures ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54290RGER | Higher 2.5A/3.5A current capability; integrated FETs; 100kHz–2.5MHz frequency range; no fixed 3.3V option. | Requires external feedback for both outputs; better suited for high-frequency, high-current designs where board space is less constrained. | Select when needing >3.2A adjustable output or >600kHz switching; not drop-in due to different pinout and no fixed 3.3V rail. |
| RT8205AZSP | Fixed 3.3V + adjustable 0.6V–5.5V outputs; 2A/3A rating; 500kHz fixed frequency; smaller QFN-20 package. | Lacks frequency adjustability and independent soft-start; optimized for cost-sensitive, lower-power portable devices. | Choose for compact, fixed-frequency designs where 5.5V max adjustable output suffices; incompatible pinout and thermal design. |
Compared with TPS54290RGER and RT8205AZSP, the LM2717MTX uniquely combines a factory-trimmed 3.3V rail with fully adjustable second output, 300–600kHz tuning, and dual independent soft-start - making it optimal for legacy portable systems requiring proven reliability and minimal external components.
Availability
LM2717MTX is available at Aetrix Electronics and suitable for TFT-LCD displays, handheld devices, and laptop computers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM2717MTX 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 DC/DC conversion.
The LM2717MTX belongs to TI's legacy power management portfolio designed specifically for portable and display applications demanding dual-rail efficiency, thermal robustness, and simplified layout - reflecting TI's focus on integration without compromising design flexibility.
FAQ
What is the maximum output current supported by each buck regulator in the LM2717MTX?
The LM2717MTX provides a fixed 3.3V output capable of delivering up to 2.2A continuous current, and an adjustable output supporting up to 3.2A. These values are specified at VIN = 8V and represent guaranteed current limits before foldback activation. Both channels maintain 0.16Ω RDS(ON) to sustain these currents with minimal thermal rise under proper PCB copper pour and airflow conditions. The LM2717MTX datasheet confirms these ratings in the Electrical Characteristics table under ICL1 and ICL2 parameters.
Does the LM2717MTX require external feedback resistors for the 3.3V output?
No, the LM2717MTX does not require external feedback resistors for its fixed 3.3V output. Pin FB1 is internally referenced to exactly 3.3V, eliminating the need for a resistor divider. This simplifies design and improves accuracy versus externally trimmed solutions. The adjustable buck channel (FB2) does require a two-resistor divider to set its output voltage based on the 1.267V internal reference. This distinction is explicitly stated in the LM2717MTX datasheet's "Features" and "Electrical Characteristics" sections.
How is the switching frequency adjusted on the LM2717MTX?
The LM2717MTX switching frequency is set using an external resistor connected between the FSLCT pin (Pin 19) and AGND. A 46.4kΩ resistor yields 300kHz, while 22.6kΩ sets 600kHz; intermediate values scale linearly. This resistor adjusts the oscillator ramp rate and is independent of input voltage or load. The LM2717MTX datasheet provides the exact relationship in the Electrical Characteristics table under the FSW parameter, confirming frequency tolerance and temperature stability across −40°C to +125°C.
What is the purpose of separating AGND and PGND pins on the LM2717MTX?
The LM2717MTX separates AGND (analog ground) and PGND (power ground) to isolate noise-sensitive control circuitry from high-current switching return paths. PGND handles pulsed currents from SW1/SW2, while AGND references FB1/FB2, VC1/VC2, and VBG. TI mandates direct connection of AGND and PGND *at the package*, not on the PCB plane, to prevent ground bounce from modulating feedback signals. This requirement is emphasized in the LM2717MTX datasheet's "Layout Considerations" section and pin descriptions.
Can the LM2717MTX operate with an input voltage below 4V?
No, the LM2717MTX has a minimum operating input voltage of 4V as specified in its Absolute Maximum Ratings and Operating Conditions tables. Input undervoltage protection (UVP) disables both regulators if VIN drops below approximately 3.8V (on-threshold) and remains disabled until VIN rises above 4V. Attempting operation below 4V risks failure to regulate or erratic behavior. This hard limit is confirmed across multiple sections of the LM2717MTX datasheet, including "PROTECTION (BOTH REGULATORS)" and "Electrical Characteristics."
LM2717MTX 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:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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 FAQ
1.How can I place an order for LM2717MTX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2717MTX 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 reliable?
The price and inventory of LM2717MTX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2717MTX is usually 5 days.
3.What payment methods are accepted for LM2717MTX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2717MTX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2717MTX?
LM2717MTX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2717MTX 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?
For technical support, including LM2717MTX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2717MTX requirements.
6.How does Aetrix verify that LM2717MTX is sourced from the original manufacturer or authorized distributors?
All LM2717MTX 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 meets industry standards.
7.What is the process for return or replacement of LM2717MTX?
All LM2717MTX units undergo pre-shipment inspection (PSI). If there is an issue with LM2717MTX, 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 part is unused and in its original packaging.
Return procedure for LM2717MTX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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