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Texas Instruments LM2717MT
- Part No.:
- LM2717MT
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2717MT.pdf
- Description:
- IC REG BUCK 3.3V DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,588
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Product details
Overview
LM2717MT 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 with pin-selectable 300–600kHz switching frequency. It delivers high-efficiency power conversion for space-constrained portable electronics requiring tightly regulated dual-rail supplies.
For engineers reviewing the LM2717MT datasheet, LM2717MT pinout, LM2717MT application, or LM2717MT equivalent, this page provides verified technical context, validated pin functions, confirmed dual-buck architecture details, real-world efficiency curves, and two rigorously cross-checked alternative parts for system-level power supply design and BOM optimization.
Technical Context
The LM2717MT implements two independent current-mode PWM buck regulators sharing a common input voltage domain but featuring separate shutdown (SHDN1/SHDN2), soft-start (SS1/SS2), feedback (FB1/FB2), and compensation (VC1/VC2) networks. Each regulator uses a 0.16Ω internal N-channel MOSFET switch and supports continuous conduction mode operation across its full load range.
It integrates dedicated protection circuitry including input undervoltage lockout (UVP, 3.3–4.0V threshold), overtemperature shutdown (150°C junction limit), and per-regulator current limiting (2.2A fixed / 3.2A adjustable). Frequency selection via FSLCT resistor enables precise EMI control without external clock synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 20V - supports wide-input industrial and battery-powered systems including 5V, 12V, and 19V rails. |
| Fixed Output Voltage | 3.3V ±0% - internally trimmed reference eliminates external resistor divider for primary rail. |
| Adjustable Output Range | 1.267V to 20V - set by FB2 feedback divider; minimum 1.267V matches internal bandgap reference. |
| Switch Current Limits | 2.2A (fixed buck), 3.2A (adjustable buck) - peak current limits defined at 0% duty cycle, ensuring robust overload handling. |
| Switching Frequency | 300kHz to 600kHz - resistor-programmable via FSLCT pin; enables trade-off between efficiency and component size. |
| RDS(ON) | 160mΩ (both switches) - low on-resistance minimizes conduction loss and thermal rise under full load. |
| Operating Junction Temp | −40°C to +125°C - qualified for extended-temperature industrial and embedded applications. |
Pinout & Package
LM2717MT is housed in a 24-lead TSSOP package (PW0024A), 7.8mm × 4.4mm × 1.2mm profile, RoHS-compliant with Sn lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2,11,12,PGND | Power Ground | Low-impedance return path for high-current switch nodes SW1/SW2; must connect directly to AGND at package. |
| 3,9,10,AGND | Analog Ground | Reference for feedback, compensation, and bandgap circuits; isolated from PGND except at single-point package tie. |
| 4,FB1 | Fixed Buck Feedback | Senses 3.3V output; internal 3.3V reference eliminates need for external divider. |
| 5,VC1 | Fixed Buck Compensation | Connects to error amplifier output; external RC network stabilizes loop response. |
| 6,VBG | Bandgap Reference | Provides stable 1.267V reference for adjustable buck feedback and internal biasing. |
| 7,VC2 | Adjustable Buck Compensation | Compensation node for second regulator; requires external RC network matched to FB2 divider. |
| 8,FB2 | Adjustable Buck Feedback | Inputs 1.267V reference voltage; output voltage set by RFB1/RFB2 divider ratio. |
| 13,SW2 | Adjustable Buck Switch Node | High-side switch output; connects to inductor and Schottky diode anode for buck topology. |
| 14,15,23,VIN | Input Power Supply | Common analog/digital input rail; all VIN pins must be shorted together at PCB for low-impedance path. |
| 16,CB2 | Adjustable Buck Bootstrap | Supplies gate drive voltage for high-side NMOS; requires ≥4.7nF ceramic capacitor. |
| 17,SHDN2 | Adjustable Buck Shutdown | Active-low enable; logic-high (>1.36V) enables regulator; open-circuit defaults to enabled. |
| 18,SS2 | Adjustable Buck Soft-Start | Controls startup ramp time via external capacitor; ISS2 = 4–15µA charges CSS for controlled VOUT rise. |
| 19,FSLCT | Frequency Select | Resistor-to-ground sets oscillator frequency: 46.4kΩ → 300kHz, 22.6kΩ → 600kHz. |
| 20,SS1 | Fixed Buck Soft-Start | Independent soft-start for 3.3V rail; same ISS1 current range (4–15µA) as SS2. |
| 21,SHDN1 | Fixed Buck Shutdown | Active-low enable for 3.3V regulator; identical threshold and behavior to SHDN2. |
| 22,CB1 | Fixed Buck Bootstrap | Bootstrap for first buck's high-side switch; requires same capacitor type and value as CB2. |
| 24,SW1 | Fixed Buck Switch Node | Switch output for 3.3V regulator; connects to inductor and diode in standard buck configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulation | Enables simultaneous generation of fixed 3.3V and user-adjustable rail (e.g., 5V, 12V, 15V) from single input without cross-regulation interference. |
| Per-regulator shutdown and soft-start | Allows staggered power-up sequencing, inrush current limiting, and dynamic rail disabling-critical for low-power states in portable devices. |
| 0.16Ω internal MOSFET switches | Reduces conduction loss and thermal dissipation, enabling >90% efficiency at mid-load (e.g., 5V@2A, VIN=12V) without external FETs. |
| 300–600kHz programmable frequency | Supports optimized inductor/capacitor sizing: lower frequency improves light-load efficiency; higher frequency shrinks passive components. |
| Integrated UVP, OVP, and thermal shutdown | Protects downstream circuitry during brown-out, no-load overvoltage, or thermal overload-eliminates need for discrete protection ICs. |
Applications
| TFT-LCD Display Power | Laptop Mainboard Dual-Rail Supply |
|---|---|
Use Scenario: Powers source/gate drivers and logic core in TFT-LCD panels requiring stable 3.3V and programmable VPOS/VNEG rails. IC Role / Device Role / Timing Role: Dual-buck controller delivering precisely regulated, independently sequenced outputs synchronized to display timing controller signals. Use Value: Eliminates discrete regulators and external sequencing ICs; achieves <1% output ripple at 60Hz frame rate transitions using integrated soft-start and low-RDS(ON). | Use Scenario: Generates 3.3V I/O and 5V/12V system rails on laptop mainboards with dynamic load steps up to 3A. IC Role / Device Role / Timing Role: Primary DC/DC power management IC managing CPU/GPU peripheral voltage domains with independent enable control. Use Value: Reduces board area by 40% vs. dual discrete converters; maintains <±2% regulation across −40°C to +85°C ambient with built-in thermal foldback. |
| Handheld Medical Instrument | Industrial Portable Data Terminal |
Use Scenario: Supplies 3.3V microcontroller and 15V analog front-end in battery-operated ultrasound or glucose meter. IC Role / Device Role / Timing Role: High-efficiency dual-output PMIC supporting rapid wake-from-sleep transitions and low-quiescent operation. Use Value: Achieves 27µA shutdown current (both rails off) and <6mA quiescent draw in active mode-extending Li-ion battery life beyond 12 hours. | Use Scenario: Powers ARM-based processor, RFID reader, and 4G modem in ruggedized handheld terminals operating from 7.4V Li-Poly packs. IC Role / Device Role / Timing Role: Robust dual-buck regulator with input UVLO (3.8V) and thermal shutdown protecting against field-deployed overtemperature events. Use Value: Sustains full 3.2A output at 15V even at 70°C ambient due to 115°C/W θJA and internal current limiting-no derating required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54290RGER | Fixed 3.3V + adjustable 0.8–15V outputs; 2A/3A current limits; 200–1200kHz frequency; integrated MOSFETs with 110mΩ RDS(ON). | Higher max frequency and lower RDS(ON) improve light-load efficiency and allow smaller magnetics; lacks separate AGND/PGND isolation. | Select when optimizing for ultra-compact layout and sub-1% output ripple, accepting tighter layout constraints on ground separation. |
| RT8205AZSP | Fixed 3.3V + adjustable 0.8–20V outputs; 2A/3A current limits; 300–600kHz frequency; 150mΩ RDS(ON); includes power-good indicators. | Added PWRGD1/PWRGD2 pins simplify system power sequencing validation; slightly lower RDS(ON) than LM2717MT but no VBG pin for external reference use. | Select when system-level power-good signaling is required for FPGA or ASIC initialization, and VBG functionality is not needed. |
Compared with TPS54290RGER and RT8205AZSP, the LM2717MT offers superior analog ground separation (AGND/PGND), explicit bandgap access (VBG), and proven thermal performance in extended-temperature portable designs-but requires more careful PCB layout to maintain noise immunity in sensitive analog sections.
Availability
LM2717MT is available at Aetrix Electronics and suitable for TFT-LCD displays, handheld medical instruments, and industrial portable data terminals requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for LM2717MT 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 over 50 years of innovation in high-reliability power conversion solutions.
The LM2717MT belongs to TI's dual-output DC/DC converter product line, engineered specifically for portable and space-constrained applications demanding independent, high-efficiency, and thermally robust dual-rail power generation from a single input source.
FAQ
What is the maximum input voltage supported by the LM2717MT?
The LM2717MT supports an absolute maximum input voltage of 22V, with guaranteed operational performance across 4V to 20V. Exceeding 20V may trigger undervoltage protection or cause permanent damage. The device's internal switches and gate drivers are rated for 20V continuous operation, and the FSLCT, SHDN, and SS pins tolerate up to 7.5V, ensuring robustness in transient-rich environments typical of automotive or industrial 12V/19V rails.
Does the LM2717MT require external MOSFETs for operation?
No, the LM2717MT does not require external MOSFETs. It integrates two high-side N-channel MOSFET switches with 160mΩ RDS(ON) - one for the fixed 3.3V buck and one for the adjustable buck - eliminating the need for external power transistors. Only external passive components (inductors, capacitors, feedback resistors, bootstrap capacitors, and frequency-setting resistors) are required to complete both regulator circuits.
How is the adjustable output voltage set on the LM2717MT?
The adjustable output voltage on the LM2717MT is set using a resistor divider connected to the FB2 pin, referenced to the internal 1.267V bandgap (VBG). The formula is VOUT = 1.267V × (1 + RFB1/RFB2). For example, a 5V output requires RFB1 = 20kΩ and RFB2 = 6.8kΩ. The FB2 pin bias current is only 65nA, minimizing divider current error and enabling high-impedance, low-power setting networks.
Can both buck regulators on the LM2717MT be operated simultaneously?
Yes, both buck regulators on the LM2717MT can operate simultaneously and independently. They share only the VIN and ground connections; each has dedicated control loops (FB1/VC1 and FB2/VC2), shutdown pins (SHDN1/SHDN2), soft-start pins (SS1/SS2), and switch nodes (SW1/SW2). This independence prevents cross-regulation and allows asynchronous start-up, dynamic rail disabling, and different output voltages - essential for multi-domain power systems like laptops or test equipment.
What thermal protection features does the LM2717MT include?
The LM2717MT includes integrated thermal shutdown that disables both buck regulators when the junction temperature exceeds approximately 150°C. Once the die cools below the hysteresis threshold (~135°C), operation automatically resumes. This protection is implemented per-die, not per-regulator, and operates regardless of shutdown pin states. The device's 115°C/W θJA (TSSOP package) and low 160mΩ RDS(ON) minimize self-heating, allowing full 3.2A output at 70°C ambient without external heatsinking.
LM2717MT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM2717MT FAQ
1.How can I place an order for LM2717MT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2717MT 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 LM2717MT reliable?
The price and inventory of LM2717MT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2717MT is usually 5 days.
3.What payment methods are accepted for LM2717MT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2717MT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2717MT?
LM2717MT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2717MT 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 LM2717MT?
For technical support, including LM2717MT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2717MT requirements.
6.How does Aetrix verify that LM2717MT is sourced from the original manufacturer or authorized distributors?
All LM2717MT 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 LM2717MT meets industry standards.
7.What is the process for return or replacement of LM2717MT?
All LM2717MT units undergo pre-shipment inspection (PSI). If there is an issue with LM2717MT, 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 LM2717MT part is unused and in its original packaging.
Return procedure for LM2717MT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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