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Texas Instruments LM2716MT/NOPB
- Part No.:
- LM2716MT/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2716MT/NOPB.pdf
- Description:
- IC REG BUCK BST ADJ/4V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,002
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Product details
Overview
LM2716MT/NOPB from Texas Instruments (formerly National Semiconductor) is a dual PWM DC/DC converter integrating an independent 3.3V buck regulator and an adjustable boost regulator, both featuring internal MOSFETs (0.16Ω buck, 0.12Ω boost), 4–20V input range, and user-adjustable 300–600kHz switching frequency. It delivers up to 1.8A at 3.3V and supports boost outputs up to 20V - commonly used in TFT-LCD bias supplies and portable device power rails.
For engineers reviewing the LM2716MT/NOPB datasheet, LM2716MT/NOPB pinout, LM2716MT/NOPB application, or LM2716MT/NOPB equivalent, key selection considerations include independent shutdown control per channel, analog/digital ground separation (AGND/PGND), soft-start programmability via external capacitors, and thermal/undervoltage protection - all critical for stable multi-rail power management in space-constrained handheld systems.
Technical Context
The LM2716MT/NOPB implements two independent current-mode PWM regulators: a fixed-output buck stage with 1.8A current limit and 3.3V output, and an adjustable boost stage with 3.6A current limit and feedback reference of 1.265V. Each uses dedicated compensation pins (VC1/VC2) and soft-start inputs (SS1/SS2) for loop stability tuning and inrush control.
It features separate shutdown pins (SHDN1/SHDN2), a shared frequency-select resistor input (FSLCT), and strict ground partitioning - AGND for analog circuitry and PGND for high-current switch nodes - requiring direct on-package tie-down to minimize noise coupling and ensure regulation accuracy across temperature (−40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 20V - supports wide-input battery-powered systems including Li-ion stacks and industrial 12V rails. |
| Buck Output | Fixed 3.3V ±1.5% - internally regulated; no external feedback resistors required for nominal operation. |
| Boost Output Range | Adjustable up to 20V - set via resistor divider on FB2; reference voltage is 1.265V with 27–55nA bias current. |
| Switching Frequency | 300–600kHz - pin-adjustable via FSLCT resistor; enables optimization of size vs. efficiency for external magnetics. |
| Buck Switch RDS(on) | 160mΩ - reduces conduction loss at 1.8A load; supports >90% efficiency at mid-load with proper layout. |
| Boost Switch RDS(on) | 120mΩ - lowers dropout and improves efficiency in high-step-up ratios (e.g., 5V→15V). |
| Thermal Shutdown | Active at 150°C junction - protects against sustained overload or poor PCB thermal design. |
| Undervoltage Lockout | Turns on at 3.35–4.0V, off at 3.10–3.9V - prevents erratic startup during brownout or battery sag. |
Pinout & Package
LM2716MT/NOPB is housed in a 24-lead TSSOP package (NSC drawing MTC24) with exposed thermal pad (not electrically connected). Pin assignments are validated per National Semiconductor SNVS240F datasheet, with duplicated pins (e.g., multiple VIN, PGND, AGND) requiring direct on-package shorting per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 10, 11, 12, PGND | Power ground | Must be tied directly to AGND at the package; carries high di/dt currents from both SW1 and SW2 switches. |
| 2, FB1 | Buck feedback input | Monitors 3.3V output via internal 1.26V reference; 65–75µA bias current sets divider resistor sizing. |
| 5, SS2 | Boost soft-start input | Sinks 15–22µA to charge external capacitor; controls ramp rate of boost output during startup. |
| 7, FB2 | Boost feedback input | Reference voltage = 1.265V; low 27–55nA bias enables high-resistor-divider designs minimizing quiescent current. |
| 8, 9, AGND | Analog ground | Reference for error amplifiers, bandgap, and compensation networks; must connect to PGND only at package. |
| 13–15, SW2 | Boost switch node | High-current output of internal boost NMOS; requires low-inductance routing to inductor and diode. |
| 16–17, 23, VIN | Main input supply | Shared 4–20V input for both regulators; multiple pins reduce IR drop and improve decoupling effectiveness. |
| 18, SHDN2 | Boost shutdown | Active-low logic input; <1.35V disables boost stage while buck remains operational. |
| 19, FSLCT | Frequency select | Resistor-to-ground sets switching frequency: 22.6kΩ → ~600kHz, 47.5kΩ → ~300kHz. |
| 20, SS1 | Buck soft-start input | Sinks 6–12µA; allows independent control of 3.3V rail ramp time without affecting boost sequencing. |
| 21, SHDN1 | Buck shutdown | Active-low logic input; <1.35V disables buck stage independently of boost functionality. |
| 22, CB1 | Buck bootstrap capacitor | Connects 3.3nF+ ceramic capacitor between CB1 and SW1 to drive high-side buck switch gate. |
| 24, SW1 | Buck switch node | Output of internal buck NMOS; connects to inductor and freewheeling diode; high di/dt path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulation | Enables simultaneous generation of fixed 3.3V and programmable high-voltage rail (e.g., LCD VPOS/VNEG) from single input source. |
| Separate shutdown control | SHDN1 and SHDN2 allow dynamic power sequencing - e.g., disable boost during sleep mode while maintaining 3.3V system rail. |
| Programmable soft-start | SS1 and SS2 accept external capacitors to tailor startup timing per rail, preventing inrush-induced supply droop or display flicker. |
| Integrated low-RDS(on) switches | Eliminates need for external MOSFETs and gate drivers; reduces BOM count and layout complexity in compact portable designs. |
| Dedicated AGND/PGND separation | Minimizes noise coupling from power switching into sensitive analog control loops - essential for stable regulation under dynamic load transients. |
| Input undervoltage protection | Prevents operation below safe input threshold, avoiding unstable regulation or uncontrolled output collapse during battery discharge. |
Applications
| TFT-LCD Display Power | Handheld Device Dual-Rail Supply |
|---|---|
Use Scenario: Generating positive and negative bias voltages (e.g., +15V and −10V) for active-matrix LCD panels in portable media players. IC Role / Device Role / Timing Role: LM2716MT/NOPB provides isolated, independently controlled buck (3.3V system rail) and boost (adjustable high-voltage rail) outputs from a single Li-ion cell or 5V USB input. Use Value: Reduces component count by integrating two regulators with matched thermal performance and shared input filtering - enabling thinner bezel designs and lower EMI emissions. | Use Scenario: Powering baseband processor (3.3V) and RF front-end (5–12V adjustable) in cellular handsets or digital cameras. IC Role / Device Role / Timing Role: LM2716MT/NOPB serves as primary dual-output PMIC, with buck supplying core logic and boost powering camera flash LED drivers or RF power amplifiers. Use Value: Independent shutdown and soft-start allow precise power sequencing - e.g., enabling 3.3V rail before boosting to flash voltage - improving system reliability and reducing boot-time faults. |
| Portable Medical Instrumentation | Industrial Handheld Scanner |
Use Scenario: Delivering stable 3.3V microcontroller supply and adjustable sensor excitation voltage (e.g., 8–15V) in battery-operated glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: LM2716MT/NOPB acts as compact, thermally robust dual-rail source where precision analog sensing demands clean 3.3V and calibrated high-voltage excitation. Use Value: Low-quiescent-current operation (3.5mA typ. total IQ) extends battery life; undervoltage lockout prevents erroneous readings during end-of-life battery conditions. | Use Scenario: Powering CMOS image sensor (3.3V) and laser diode driver (7–12V) in rugged barcode scanners operating from 7.4V Li-Poly packs. IC Role / Device Role / Timing Role: LM2716MT/NOPB functions as main DC/DC controller, using buck for logic and boost for laser bias - with thermal shutdown protecting against overheating in sealed enclosures. Use Value: 125°C max operating junction temperature and integrated overtemperature protection ensure reliable operation in hot ambient environments without forced cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-regulator power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65131RGTR | Fixed 3.3V buck + adjustable boost (up to 28V); higher boost current (4A); 2.7–5.5V input range. | Optimized for AMOLED displays requiring higher boost voltage; narrower input range limits use with 12V industrial inputs. | Select when >20V boost output or tighter input range is acceptable; not drop-in due to different pinout and control interface. |
| MAX17075ETL+ | 3.3V buck + adjustable boost (up to 20V); 4.5–28V input; includes I2C interface for dynamic voltage scaling. | Supports programmable output adjustment and telemetry; adds complexity for simple fixed-rail designs. | Choose when digital control and telemetry are needed; requires firmware integration and additional PCB footprint. |
Compared with LM2716MT/NOPB, TPS65131RGTR offers higher boost voltage capability but restricts input flexibility, while MAX17075ETL+ adds digital configurability at the cost of increased design overhead - making LM2716MT/NOPB optimal for analog-controlled, wide-input dual-rail applications where simplicity and thermal robustness are prioritized.
Availability
LM2716MT/NOPB is available at Aetrix Electronics and suitable for TFT-LCD displays, handheld devices, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2716MT/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 acquired National Semiconductor in 2011 and maintains full technical and supply chain continuity for legacy power management ICs like the LM2716MT/NOPB.
The LM2716MT/NOPB belongs to TI's legacy dual-output DC/DC converter product line, designed specifically for space-constrained portable electronics needing independent, high-efficiency buck and boost regulation from a single wide-input source.
FAQ
What is the maximum boost output voltage supported by the LM2716MT/NOPB?
The LM2716MT/NOPB supports an adjustable boost output voltage up to 20V, set via an external resistor divider on the FB2 pin. The internal feedback reference is 1.265V, and the device maintains regulation stability across the full range when external components (inductor, diode, output capacitor) are selected per the datasheet guidelines for the target output voltage and load current.
Does the LM2716MT/NOPB require external MOSFETs for operation?
No, the LM2716MT/NOPB integrates both the buck and boost power switches: a 0.16Ω NMOS for the 3.3V buck stage and a 0.12Ω NMOS for the adjustable boost stage. These internal switches eliminate the need for external MOSFETs, gate drivers, or associated discrete components - simplifying design and reducing board area in portable applications.
How is switching frequency configured on the LM2716MT/NOPB?
Switching frequency on the LM2716MT/NOPB is set using a single resistor connected from the FSLCT pin to ground. A 47.5kΩ resistor yields ~300kHz operation, while a 22.6kΩ resistor sets ~600kHz. This pin-adjustable range allows designers to balance inductor size, efficiency, and EMI performance without changing the IC or layout.
Can the buck and boost sections of the LM2716MT/NOPB be controlled independently?
Yes, the LM2716MT/NOPB provides fully independent control: SHDN1 disables only the buck converter, SHDN2 disables only the boost converter, and SS1/SS2 allow separate soft-start timing via external capacitors. This enables flexible power sequencing - for example, powering the 3.3V rail first, then ramping the boost output after system initialization.
What thermal protection features does the LM2716MT/NOPB include?
The LM2716MT/NOPB includes integrated thermal shutdown that disables both regulators when the junction temperature reaches 150°C. It also features input undervoltage lockout (UVP) that prevents operation below ~3.35V, protecting against instability during brownout conditions. Both protections are fully internal and require no external components to function.
LM2716MT/NOPB 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-Up, Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 4V (3.3V)
- Voltage - Output (Max):
- 20V (Switch)
- Current - Output:
- 3.6A (Switch), 1.8A
- 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
LM2716MT/NOPB FAQ
1.How can I place an order for LM2716MT/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2716MT/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 LM2716MT/NOPB reliable?
The price and inventory of LM2716MT/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2716MT/NOPB is usually 5 days.
3.What payment methods are accepted for LM2716MT/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2716MT/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2716MT/NOPB?
LM2716MT/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2716MT/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 LM2716MT/NOPB?
For technical support, including LM2716MT/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2716MT/NOPB requirements.
6.How does Aetrix verify that LM2716MT/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2716MT/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 LM2716MT/NOPB meets industry standards.
7.What is the process for return or replacement of LM2716MT/NOPB?
All LM2716MT/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2716MT/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 LM2716MT/NOPB part is unused and in its original packaging.
Return procedure for LM2716MT/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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