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Texas Instruments LM2717MT-ADJ/NOPB
- Part No.:
- LM2717MT-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2717MT-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
LM2717MT-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 operating from 4V–20V input and supporting output voltages as low as 1.267V. It integrates internal power MOSFETs, pin-selectable 300–600kHz switching frequency, independent soft-start and shutdown controls, and thermal/UV/OV protection - used in TFT-LCD bias supplies and portable computing power rails.
For engineers reviewing the LM2717MT-ADJ/NOPB datasheet, LM2717MT-ADJ/NOPB pinout, LM2717MT-ADJ/NOPB application, or LM2717MT-ADJ/NOPB equivalent, key selection considerations include verified dual-output current capability (2.2A/3.2A), confirmed TSSOP-24 package mapping, validated per-converter shutdown and soft-start functionality, and documented 0.16Ω RDS(ON) performance across temperature.
Technical Context
The LM2717MT-ADJ/NOPB implements two independent current-mode PWM buck regulators sharing a common bandgap reference (1.267V) and thermal shutdown circuitry. Each channel features dedicated error amplifiers (gm1 = 1340 µmho, gm2 = 1360 µmho), separate compensation pins (VC1/VC2), and individual feedback inputs (FB1/FB2) enabling precise output regulation down to 1.267V.
Switching frequency is set externally via resistor FSLCT (46.4kΩ → 300kHz; 22.6kΩ → 600kHz), while duty cycle is limited to 89–93% and minimum on-time enforces ≥5% duty cycle at 300kHz. Protection includes input undervoltage lockout (UVP: 3.8V ON / 3.3V OFF), overtemperature shutdown (TJ = 150°C), and per-channel OVP monitoring at FB pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 20V - supports wide-input industrial and automotive battery-supplied systems without pre-regulation. |
| Buck 1 Output Current | 2.2A max - enables single-chip power for core logic or memory rails in portable devices. |
| Buck 2 Output Current | 3.2A max - sufficient for high-current analog subsystems like LCD gate drivers or camera modules. |
| RDS(ON) (each switch) | ≤0.16Ω - minimizes conduction loss and thermal rise at full load, enabling >90% efficiency at mid-load. |
| Feedback Reference Voltage | 1.258V (typ) - sets output voltage accuracy and enables stable regulation with standard resistor dividers. |
| Switching Frequency Range | 300kHz to 600kHz - allows trade-off between external component size (inductor/capacitor) and EMI profile. |
| Thermal Resistance θJA | 115°C/W (TSSOP-24) - defines maximum power dissipation before thermal shutdown under standard PCB layout. |
Pinout & Package
LM2717MT-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 are physically separated but must be connected directly at the package per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1,2,11,12) | Power ground return | Carries high-frequency switch node return current; requires low-inductance connection to input/output capacitors. |
| AGND (Pins 3,9,10) | Analog ground reference | Reference for feedback, error amp, and bandgap; must tie to PGND at single point near IC to avoid noise coupling. |
| FB1 / FB2 | Voltage feedback inputs | Monitor regulated outputs via resistor dividers; 1.258V reference enables precise output setting (e.g., VOUT1 = 1.258V × (1 + RFB1/RFB2)). |
| SW1 / SW2 | Power switch outputs | Drive external inductors and catch diodes; swing from VIN to ~0.2V during conduction (due to 0.16Ω RDS(ON)). |
| SHDN1 / SHDN2 | Active-low shutdown controls | Enable independent power sequencing; logic threshold ~1.36V (high) / ~0.7V (low); <5µA leakage when asserted. |
| SS1 / SS2 | Soft-start timing inputs | Accept external capacitor to ramp current limit linearly; ISS ≈ 9µA enables predictable inrush control (TSS ≈ CSS × 0.6V / 9µA). |
| FSLCT | Frequency select input | Resistor-to-ground sets oscillator frequency; 46.4kΩ yields 300kHz, 22.6kΩ yields 600kHz - critical for EMI compliance and component sizing. |
| VIN (Pins 14,15,23) | Main power input | All internally connected; must be decoupled with ≥47µF low-ESR capacitor plus 0.1–4.7µF ceramic for high-frequency noise suppression. |
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-regulation impact. |
| Per-channel shutdown and soft-start | Supports flexible power sequencing in multi-rail systems - e.g., delay Buck 2 startup until Buck 1 stabilizes. |
| Low RDS(ON) integrated switches | 0.16Ω typical reduces conduction loss by >30% vs. comparable 0.22Ω parts, lowering thermal stress at 2–3A loads. |
| Adjustable 300–600kHz switching | Allows optimization: 600kHz shrinks magnetics for space-constrained handhelds; 300kHz lowers switching loss in high-current laptop applications. |
| Integrated bandgap reference | 1.267V ±1.5% reference ensures consistent feedback accuracy across −40°C to +125°C junction temperature range. |
Applications
| TFT-LCD Display Power | Portable Computing Rail |
|---|---|
Use Scenario: Generating dual bias voltages (VON, VOFF) and gate driver supplies for active-matrix LCD panels in tablets and industrial HMIs. IC Role / Device Role / Timing Role: Dual-buck regulator providing isolated, independently sequenced 5V and 15V outputs with tight regulation (<±1.5%) and fast transient response. Use Value: Eliminates need for discrete regulators or transformers; 93% max duty cycle supports high-VIN/low-VOUT ratios required for gate driver efficiency. |
Use Scenario: Supplying core logic (1.2V/1.8V) and I/O (3.3V) rails in battery-powered laptops and ultrabooks with dynamic load steps. IC Role / Device Role / Timing Role: Primary dual-output PMIC delivering 2.2A and 3.2A with independent soft-start to prevent input bus sag during boot. Use Value: Integrated 0.16Ω switches achieve >88% efficiency at 2A/3.3V, reducing heat sink requirements and extending battery runtime. |
| Automotive Infotainment | Handheld Medical Device |
Use Scenario: Powering DSP, display, and sensor interfaces in 12V automotive infotainment head units requiring robust UV/OV/thermal protection. IC Role / Device Role / Timing Role: Dual DC/DC converter handling 4V–20V input transients (cold crank, load dump) while maintaining stable 3.3V and 5V outputs. Use Value: Input UVLO (3.3V off-threshold) prevents malfunction during battery brownouts; thermal shutdown (150°C) protects against under-hood overheating. |
Use Scenario: Providing regulated power to microcontroller, OLED display, and analog front-end in portable ultrasound or glucose monitors. IC Role / Device Role / Timing Role: Compact dual-buck solution delivering low-noise 1.8V (MCU) and 3.3V (sensor interface) from single Li-ion cell (3.0–4.2V). Use Value: 300kHz minimum frequency enables use of small 2.2µH inductors; TSSOP-24 footprint fits <100mm² PCB area constraints. |
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 current rating; 500kHz–2MHz frequency range; requires external compensation. | Better suited for high-frequency, high-efficiency designs needing >600kHz operation or tighter transient response. | Select TPS54290RGER when higher switching frequency or improved light-load efficiency is required; LM2717MT-ADJ/NOPB remains optimal for cost-sensitive, fixed-frequency 300–600kHz designs. |
| RT8205AZSP | Lower 1.5A/2.5A current capability; integrated bootstrap diodes; no independent soft-start pins. | Targeted at simpler dual-rail applications where per-channel sequencing is not needed and board space is extremely constrained. | Choose RT8205AZSP only for compact, lower-current applications lacking sequencing requirements; LM2717MT-ADJ/NOPB provides superior current headroom and design flexibility. |
Compared with TPS54290RGER and RT8205AZSP, the LM2717MT-ADJ/NOPB offers the best balance of verified 2.2A/3.2A output capability, pin-configurable 300–600kHz operation, and independent soft-start/shutdown - making it uniquely suitable for mid-power portable and display applications requiring predictable, sequenced dual-rail startup.
Availability
LM2717MT-ADJ/NOPB is available at Aetrix Electronics and suitable for TFT-LCD displays, portable computing power rails, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2717MT-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 ICs, with decades of expertise in high-efficiency DC/DC conversion and automotive-grade reliability.
The LM2717MT-ADJ/NOPB belongs to TI's dual-output synchronous buck converter product line, designed specifically for space-constrained portable and display applications demanding independent regulation, robust protection, and simplified layout.
FAQ
What is the minimum output voltage supported by the LM2717MT-ADJ/NOPB?
The LM2717MT-ADJ/NOPB supports output voltages as low as 1.267V, determined by its internal 1.267V bandgap reference voltage (VBG). This value is confirmed in the Electrical Characteristics table (VBG = 1.248V to 1.294V, typ 1.267V) and applies to both Buck 1 and Buck 2 channels when configured with appropriate feedback resistors. The LM2717MT-ADJ/NOPB achieves this using precision resistor-divider networks tied to FB1 and FB2 pins.
Does the LM2717MT-ADJ/NOPB require external bootstrap diodes?
No, the LM2717MT-ADJ/NOPB does not require external bootstrap diodes. It integrates internal charge pumps and high-side gate drivers that use external bootstrap capacitors (CB1/CB2, min 4.7nF ceramic) to drive the internal N-channel MOSFETs. The datasheet explicitly specifies "bootstrap capacitor" connections and recommends 4.7nF–1µF values - no external diode is referenced in the pin descriptions, typical application circuit, or design procedure sections for the LM2717MT-ADJ/NOPB.
What is the thermal shutdown threshold for the LM2717MT-ADJ/NOPB?
The LM2717MT-ADJ/NOPB activates thermal shutdown at a maximum junction temperature of 150°C, as specified in the Absolute Maximum Ratings table. Once triggered, the device disables both buck regulators until the die temperature falls below the hysteresis threshold (typically ~15°C below trip point, though exact hysteresis is not published). This protection is shared across both channels and is confirmed in the "PROTECTION (BOTH REGULATORS)" section of the datasheet.
Can the LM2717MT-ADJ/NOPB operate with input voltage below 4V?
No, the LM2717MT-ADJ/NOPB cannot reliably operate with input voltage below 4V. Its specified operating input voltage range is 4V to 20V, and the input undervoltage protection (UVP) circuit disables both converters when VIN drops below 3.3V (off-threshold) - confirmed in the Electrical Characteristics table. Attempting operation below 4V risks failure to start, unstable regulation, or activation of UVP lockout. The LM2717MT-ADJ/NOPB is not rated for sub-4V operation.
How is switching frequency selected on the LM2717MT-ADJ/NOPB?
Switching frequency on the LM2717MT-ADJ/NOPB is selected by connecting a resistor (RF) from the FSLCT pin to AGND. A 46.4kΩ resistor sets 300kHz; a 22.6kΩ resistor sets 600kHz - values confirmed in the Electrical Characteristics table (FSW row). The relationship is linear and monotonic across the 300–600kHz range, with no digital programming or external clock required. This resistor-based method is a defining feature of the LM2717MT-ADJ/NOPB's architecture.
LM2717MT-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM2717MT-ADJ/NOPB FAQ
1.How can I place an order for LM2717MT-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2717MT-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 LM2717MT-ADJ/NOPB reliable?
The price and inventory of LM2717MT-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 LM2717MT-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2717MT-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2717MT-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2717MT-ADJ/NOPB?
LM2717MT-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2717MT-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 LM2717MT-ADJ/NOPB?
For technical support, including LM2717MT-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2717MT-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2717MT-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2717MT-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 LM2717MT-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2717MT-ADJ/NOPB?
All LM2717MT-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2717MT-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 LM2717MT-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2717MT-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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