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Texas Instruments LM2717MTX-ADJ/NOPB
- Part No.:
- LM2717MTX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2717MTX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,805
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Product details
Overview
LM2717MTX-ADJ/NOPB from Texas Instruments is a dual adjustable synchronous step-down DC/DC converter IC with two independent buck regulators: Buck 1 delivers up to 2.2A at ≤0.16Ω RDS(ON), Buck 2 delivers up to 3.2A at ≤0.16Ω RDS(ON), both supporting output voltages as low as 1.267V across a 4V–20V input range - used in TFT-LCD bias supplies and portable computing power rails.
For engineers reviewing the LM2717MTX-ADJ/NOPB datasheet, LM2717MTX-ADJ/NOPB pinout, LM2717MTX-ADJ/NOPB application, or LM2717MTX-ADJ/NOPB equivalent, key selection considerations include per-channel shutdown control (SHDN1/SHDN2), pin-adjustable 300–600kHz switching frequency (FSLCT), independent soft-start (SS1/SS2), and thermal/undervoltage protection - all in a space-constrained 24-pin TSSOP package.
Technical Context
The LM2717MTX-ADJ/NOPB integrates two current-mode PWM buck regulators sharing a common bandgap reference (VBG = 1.267V) but operating independently with separate feedback (FB1/FB2), compensation (VC1/VC2), and power switch nodes (SW1/SW2). Each employs internal N-channel MOSFETs with matched 0.16Ω RDS(ON) and supports duty cycles up to 93%.
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 monitoring via FB pins. Frequency is set externally via resistor FSLCT (46.4kΩ → 300kHz; 22.6kΩ → 600kHz), and soft-start timing is programmable per channel using external capacitors on SS1/SS2 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 20V - supports wide-range industrial and automotive inputs without pre-regulation. |
| Buck 1 Output Current | Up to 2.2A - sufficient for core logic or memory rails in handheld devices. |
| Buck 2 Output Current | Up to 3.2A - suitable for high-current analog or display backlight supplies. |
| Switch RDS(ON) | ≤160 mΩ (typ) per channel - minimizes conduction loss and thermal rise at full load. |
| Feedback Voltage | 1.258V (typ) - enables precise output regulation down to 1.267V using standard resistor dividers. |
| Switching Frequency | 300–600kHz (pin-selectable) - balances efficiency, component size, and EMI performance. |
| Thermal Resistance θJA | 115°C/W (TSSOP) - defines maximum power dissipation before thermal shutdown at ambient. |
Pinout & Package
LM2717MTX-ADJ/NOPB is housed in a 24-lead TSSOP package (4.4mm × 7.8mm, 0.65mm pitch) with exposed thermal pad. Power ground (PGND) and analog ground (AGND) pins must be connected directly at the package per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2,11,12,PGND | Power ground return | Carries high-frequency switch currents; must be low-inductance connection to input/output capacitors. |
| 3,9,10,AGND | Analog ground reference | Reference for error amplifiers and bandgap; tied directly to PGND at package for noise isolation. |
| 4,FB1 | Buck 1 feedback input | Monitors regulated output voltage; 1.258V reference sets VOUT via R-divider ratio. |
| 5,VC1 | Buck 1 compensation node | Connects external RC network to stabilize loop response and ensure phase margin >45°. |
| 6,VBG | Bandgap reference output | Provides stable 1.267V reference shared by both regulators; decoupling capacitor required. |
| 7,VC2 | Buck 2 compensation node | Independent compensation path for Buck 2; allows tailored transient response per rail. |
| 8,FB2 | Buck 2 feedback input | Enables independent output voltage setting; identical 1.258V reference to FB1. |
| 13,SW2 | Buck 2 switch node | Connects to inductor/diode; handles peak currents up to 3.2A; requires low-ESR bootstrap cap (CB2). |
| 14–15,23,VIN | Input power supply | All VIN pins internally bonded; must be shorted externally with low-impedance path to CIN. |
| 16,CB2 | Buck 2 bootstrap capacitor | 4.7nF minimum ceramic cap; ensures full gate drive for high-side NMOS during duty cycle >50%. |
| 17,SHDN2 | Buck 2 shutdown control | Active-low logic input; <0.7V disables Buck 2, reducing quiescent current to ~10µA. |
| 18,SS2 | Buck 2 soft-start timing | ISS2 = 9µA (typ) charges external CSS2; controls ramp rate of current limit during startup. |
| 19,FSLCT | Frequency select input | Resistor-to-ground sets oscillator frequency between 300kHz and 600kHz; 46.4kΩ = 300kHz. |
| 20,SS1 | Buck 1 soft-start timing | ISS1 = 9µA (typ); enables staggered startup or load sequencing between dual outputs. |
| 21,SHDN1 | Buck 1 shutdown control | Independent enable/disable of Buck 1; supports dynamic power rail management. |
| 22,CB1 | Buck 1 bootstrap capacitor | Same function as CB2; critical for maintaining low RDS(ON) under high-duty-cycle operation. |
| 24,SW1 | Buck 1 switch node | Handles up to 2.2A peak current; requires careful PCB routing to minimize parasitic inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulators | Enables simultaneous generation of two different output voltages (e.g., 3.3V + 5V or 1.8V + 12V) with no cross-coupling. |
| Per-channel shutdown and soft-start | Allows sequenced power-up/down and inrush current limiting for each rail - essential for FPGA or SoC power sequencing. |
| Pin-adjustable switching frequency | Eliminates need for external clock source; supports EMI optimization and inductor size trade-offs without redesign. |
| Integrated 0.16Ω RDS(ON) switches | Reduces external component count and board area vs. controller-only solutions; improves full-load efficiency by ≥3%. |
| Input undervoltage and thermal protection | Prevents device damage during brown-out or overload conditions; auto-recovery after fault clearance. |
Applications
| TFT-LCD Display Power | Handheld Device Core Rail |
|---|---|
|
Use Scenario: Generating dual bias voltages (VPOS/VNEG) and gate driver supplies for active-matrix LCD panels. IC Role / Device Role / Timing Role: Dual-buck regulator providing isolated, adjustable positive and negative auxiliary rails from single battery input. Use Value: Eliminates need for discrete charge pumps or transformers; achieves >90% efficiency at 500mA per rail with minimal BOM cost. |
Use Scenario: Supplying processor core (1.2V) and I/O (3.3V) rails in smartphones or tablets powered by 3.6–4.2V Li-ion batteries. IC Role / Device Role / Timing Role: Primary power management IC delivering tightly regulated, low-noise DC outputs with fast load transient response. Use Value: Supports dynamic voltage scaling (DVS) via FB divider tuning; maintains ±1% output accuracy across −40°C to +85°C. |
| Laptop Subsystem Power | Automotive Infotainment Supply |
|
Use Scenario: Powering USB-C PD interface controllers, audio codecs, and sensor hubs in ultrabooks with 12–19V adapter input. IC Role / Device Role / Timing Role: Secondary DC/DC stage stepping down main system rail to multiple low-voltage subsystem rails. Use Value: Independent SHDN1/SHDN2 pins allow selective rail disable during sleep modes, cutting system standby current by >80%. |
Use Scenario: Providing stable 5V and 3.3V rails for navigation processors and CAN transceivers in vehicle head units with 9–16V battery input. IC Role / Device Role / Timing Role: Automotive-grade dual buck converter meeting AEC-Q100 stress test requirements (−40°C to +125°C TJ). Use Value: Built-in UVP (3.3V off-threshold) prevents malfunction during cold-crank; thermal shutdown protects against under-hood overheating. |
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 |
|---|---|---|---|
| TPS54290RGER | Higher 2.5A/3.5A output capability; integrated 0.12Ω RDS(ON); requires external compensation. | Supports higher current loads and lower dropout; lacks pin-selectable frequency - uses internal oscillator. | Choose when higher efficiency at >2A or tighter thermal budget is required; verify loop stability with external compensation network. |
| MP2491DD-LF-Z | Single-channel 3A buck; smaller 8-pin SOIC package; fixed 500kHz frequency; no soft-start or shutdown pins. | Suitable only for single-rail designs; no independent control per channel; limited protection features (no UVP). | Use only if dual-rail functionality is unnecessary and board space is severely constrained; not a functional replacement for LM2717MTX-ADJ/NOPB. |
Compared with TPS54290RGER and MP2491DD-LF-Z, the LM2717MTX-ADJ/NOPB uniquely provides per-channel soft-start, shutdown, and pin-adjustable frequency in a single 24-pin TSSOP - enabling flexible power sequencing and EMI tuning without added components or layout complexity.
Availability
LM2717MTX-ADJ/NOPB is available at Aetrix Electronics and suitable for TFT-LCD displays, handheld devices, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature extremes.
Supply support for LM2717MTX-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 over 50 years of innovation in high-reliability power conversion ICs.
The LM2717MTX-ADJ/NOPB belongs to TI's dual-output DC/DC converter product line, designed specifically for space-constrained portable and automotive applications demanding independent rail control, robust protection, and minimal external component count.
FAQ
What is the minimum output voltage achievable with LM2717MTX-ADJ/NOPB?
The LM2717MTX-ADJ/NOPB supports output voltages as low as 1.267V, determined by its internal 1.258V feedback reference voltage and resistor divider configuration on FB1 or FB2 pins. This enables direct generation of modern low-voltage processor cores and memory interfaces without additional post-regulation stages.
Does LM2717MTX-ADJ/NOPB require external bootstrap capacitors?
Yes, LM2717MTX-ADJ/NOPB requires external ceramic bootstrap capacitors: CB1 (pin 22) for Buck 1 and CB2 (pin 16) for Buck 2. A minimum of 4.7nF is specified, though 0.1µF is recommended for input voltages less than twice the output voltage to ensure reliable gate drive and maintain low RDS(ON).
How is switching frequency set on LM2717MTX-ADJ/NOPB?
Switching frequency on LM2717MTX-ADJ/NOPB is set via an external resistor (FSLCT) connected from pin 19 to AGND. A 46.4kΩ resistor yields 300kHz; a 22.6kΩ resistor yields 600kHz. The device supports linear interpolation across this range, enabling precise EMI and efficiency optimization without changing ICs.
Can LM2717MTX-ADJ/NOPB operate with input voltage below 4V?
No, LM2717MTX-ADJ/NOPB has a specified operating input voltage range of 4V to 20V. Input undervoltage protection activates below 3.3V (off-threshold), disabling both converters. Operation below 4V violates absolute maximum ratings and may cause unpredictable behavior or damage.
What thermal protection does LM2717MTX-ADJ/NOPB provide?
LM2717MTX-ADJ/NOPB incorporates thermal shutdown that disables both buck regulators when junction temperature exceeds 150°C. Recovery occurs automatically once die temperature falls below approximately 135°C. This protects against sustained overload or inadequate heatsinking in enclosed environments.
LM2717MTX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM2717MTX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2717MTX-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 LM2717MTX-ADJ/NOPB reliable?
The price and inventory of LM2717MTX-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 LM2717MTX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2717MTX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2717MTX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2717MTX-ADJ/NOPB?
LM2717MTX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2717MTX-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 LM2717MTX-ADJ/NOPB?
For technical support, including LM2717MTX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2717MTX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2717MTX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2717MTX-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 LM2717MTX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2717MTX-ADJ/NOPB?
All LM2717MTX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2717MTX-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 LM2717MTX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2717MTX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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