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Texas Instruments LM2716MTX
- Part No.:
- LM2716MTX
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2716MTX.pdf
- Description:
- IC REG BUCK BST ADJ/4V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,973
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Product details
Overview
LM2716MTX from Texas Instruments (formerly National Semiconductor) is a dual PWM DC/DC converter integrating an independent 3.3V fixed-output buck regulator and an adjustable boost regulator supporting up to 20V output. It features 0.16Ω buck switch (1.8A current limit), 0.12Ω boost switch (3.6A current limit), 300–600kHz pin-adjustable switching frequency, and independent shutdown/soft-start pins. It powers TFT-LCD bias rails and portable device core/peripheral supplies.
For engineers reviewing the LM2716MTX datasheet, LM2716MTX pinout, LM2716MTX application, or LM2716MTX equivalent, key selection criteria include input voltage range (4V–20V), dual-regulator independence, thermal/undervoltage protection, TSSOP-24 package layout constraints, and compensation network design for both buck and boost loops.
Technical Context
The LM2716MTX implements two independent current-mode PWM regulators: a fixed 3.3V buck stage with internal 0.16Ω NMOS switch and 1.8A current limit, and an adjustable boost stage with 0.12Ω NMOS switch and 3.6A current limit. Each uses dedicated error amplifiers (AV1 = 100 V/V, AV2 = 135 V/V) and compensation pins (VC1, VC2) for loop stability.
It supports pin-selectable switching frequency (300–600kHz via FSLCT resistor), independent soft-start (SS1/SS2) and shutdown (SHDN1/SHDN2) control, input undervoltage lockout (UVP thresholds: 3.35–4.0V on, 3.10–3.9V off), and thermal shutdown at 150°C. Ground separation (AGND/PGND) is enforced for noise immunity in mixed-signal power conversion.
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. |
| Buck Output | Fixed 3.3V ±1.5% - delivers stable logic/core rail for microcontrollers and interface ICs. |
| Boost Output Range | Adjustable up to 20V - enables TFT-LCD VGH/VGL generation and white LED biasing. |
| Switch RDS(ON) | Buck: 0.16Ω; Boost: 0.12Ω - minimizes conduction loss at high load currents. |
| Switch Current Limits | Buck: 1.8A; Boost: 3.6A - defines maximum continuous output capability before foldback. |
| Switching Frequency | 300–600kHz (resistor-programmable) - balances efficiency vs. external component size (inductor/capacitor). |
| Thermal Protection | Junction shutdown at 150°C - prevents permanent damage during overload or poor heatsinking. |
Pinout & Package
LM2716MTX is housed in a 24-lead TSSOP package (NSC drawing MTC24) with exposed thermal pad (not electrically connected). AGND and PGND must be tied together directly at the package per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 9, 10, 11, 12 | PGND / AGND | Separate power and analog ground pins - require direct low-inductance tie at package to minimize noise coupling into feedback paths. |
| 2, 7 | FB1 / FB2 | Buck and boost feedback inputs - reference 3.3V (FB1) and 1.265V (FB2); bias currents 65–75µA and 27–55nA respectively. |
| 3, 6 | VC1 / VC2 | Compensation nodes for buck/boost error amplifiers - connect RC/CC networks to stabilize control loops across load/line transients. |
| 5, 20 | SS2 / SS1 | Soft-start timing inputs - charge external capacitors with 15–22µA (SS2) or 6–12µA (SS1) current sources to control ramp rates. |
| 13–15, 24 | SW2 ×3 / SW1 | Boost and buck switch node terminals - SW2 pins are paralleled internally; SW1 connects VIN to buck inductor; all require low-impedance routing. |
| 16, 17, 23 | VIN | Main power input - three pins must be shorted externally at PCB to handle peak input current and reduce IR drop. |
| 18, 21 | SHDN2 / SHDN1 | Active-low shutdown controls - independently disable boost or buck stage; leakage <5µA when asserted. |
| 19 | FSLCT | Frequency select - resistor to AGND sets switching frequency between 300kHz and 600kHz with ±10% tolerance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent regulation | Enables simultaneous 3.3V system rail and programmable high-voltage bias (e.g., LCD gate drivers) without cross-regulation interference. |
| Patented current limit circuitry | Maintains accurate 1.8A (buck) and 3.6A (boost) current limits across temperature and input voltage, preventing switch overcurrent during startup or fault. |
| Independent soft-start and shutdown | Allows staggered power-up sequencing and selective power domain control - critical for multi-rail portable devices. |
| Input undervoltage protection (UVP) | Prevents erratic operation below 3.35V (turn-on) and ensures clean shutdown above 3.10V (turn-off), protecting downstream loads during brownout. |
| Low RDS(ON) integrated switches | Reduces conduction losses by >30% versus comparable discrete-FET solutions, improving full-load efficiency in compact layouts. |
Applications
| TFT-LCD Display Power | Handheld Device Core Supply |
|---|---|
Use Scenario: Generating VGH (15–20V) and VGL (−5 to −10V) bias voltages for active-matrix LCD panels in automotive infotainment or medical displays. IC Role / Device Role / Timing Role: Dual-regulator PMIC providing isolated high-side and low-side gate drive rails with independent enable control and soft-start. Use Value: Eliminates need for separate boost and inverting converters; UVP prevents panel latch-up during cold-cranking; thermal shutdown protects against backlight overdrive faults. | Use Scenario: Powering ARM Cortex-M microcontroller cores (3.3V) and peripheral interfaces (adjustable 5–12V) in ruggedized handheld test equipment. IC Role / Device Role / Timing Role: Single-chip dual-output DC/DC controller delivering regulated rails with independent sequencing and fault management. Use Value: Reduces BOM count by 2× versus discrete solutions; 300–600kHz frequency tuning allows optimal inductor sizing for shock/vibration resistance; TSSOP-24 footprint supports automated assembly. |
| Portable Medical Instrumentation | Digital Camera Sensor Bias |
Use Scenario: Supplying precision analog front-end (3.3V) and programmable sensor excitation (up to 18V) in portable ECG or pulse oximetry units. IC Role / Device Role / Timing Role: Dual-channel power manager with low-noise analog ground separation and independent shutdown for power domain isolation. Use Value: AGND/PGND partitioning minimizes switching noise coupling into ADC references; soft-start prevents sensor bias overshoot that could saturate amplifiers. | Use Scenario: Providing adjustable bias voltage (8–15V) for CCD/CMOS image sensor substrates while maintaining 3.3V I/O and logic supply. IC Role / Device Role / Timing Role: Integrated step-down/step-up converter enabling compact, low-EMI camera module designs with minimal external components. Use Value: High boost current limit (3.6A) supports fast sensor reset pulses; 0.12Ω RDS(ON) sustains efficiency >85% at 12V/500mA output under battery discharge conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-regulator DC/DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65131RGTR | Fixed 3.3V buck + adjustable positive/negative boost; includes integrated LDOs and I²C interface. | Targets display bias with integrated VCOM control; requires digital configuration. | Choose for systems needing programmable sequencing, telemetry, or dual-polarity outputs beyond LM2716MTX's single boost channel. |
| MAX8647ETL+ | 3.3V buck + adjustable boost; 2.5MHz fixed frequency; smaller 20-pin TQFN package. | Optimized for space-constrained mobile handsets; lacks independent soft-start pins and UVP hysteresis. | Choose when board area is critical and higher switching frequency justifies reduced efficiency at light loads. |
Compared with TPS65131RGTR and MAX8647ETL+, the LM2716MTX offers superior analog control flexibility (independent SS/SHDN, resistor-tuned frequency, dual compensation networks) and robust protection (UVP with hysteresis, thermal shutdown), making it ideal for industrial and medical applications where deterministic analog behavior outweighs digital configurability or ultra-small footprint.
Availability
LM2716MTX is available at Aetrix Electronics and suitable for TFT-LCD display power, handheld device core supply, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2716MTX 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 (TI) acquired National Semiconductor in 2011 and maintains legacy product support, documentation, and manufacturing continuity for high-reliability analog power ICs.
The LM2716MTX belongs to TI's legacy dual-output DC/DC converter family designed for portable and industrial systems requiring independent, high-efficiency step-down and step-up regulation without digital overhead.
FAQ
What is the maximum adjustable output voltage of the boost converter in LM2716MTX?
The LM2716MTX boost converter supports an adjustable output voltage up to 20V, set via an external resistor divider on the FB2 pin referencing its 1.265V internal bandgap. This range enables TFT-LCD gate driver biasing and white LED string driving. Operation beyond 20V is not supported and may violate absolute maximum ratings for SW2 and FB2 pins.
Does LM2716MTX support independent enable control for each regulator?
Yes, LM2716MTX provides independent active-low shutdown pins: SHDN1 controls the buck converter and SHDN2 controls the boost converter. When either pin is pulled low, its respective regulator halts switching and reduces quiescent current to ≤9µA total (both in shutdown). This enables precise power domain sequencing in multi-rail systems.
What is the recommended input capacitor value for LM2716MTX in high-dynamic-load applications?
For high-dynamic-load applications, LM2716MTX requires a minimum 68µF to 100µF low-ESR aluminum, tantalum, or ceramic input capacitor, rated ≥25% above the maximum input voltage (e.g., 25V for 20V max VIN). A parallel 0.1µF ceramic capacitor is mandatory near the VIN pins to suppress high-frequency noise and ensure stable operation during transient load steps.
How does the LM2716MTX implement input undervoltage protection?
The LM2716MTX implements input undervoltage protection (UVP) with hysteresis: it disables both regulators when VIN falls below 3.10–3.9V (off threshold) and re-enables them only when VIN rises above 3.35–4.0V (on threshold). This prevents erratic startup/shutdown behavior during battery sag or supply brownout, ensuring clean power delivery to sensitive downstream circuits.
Can LM2716MTX operate with a single input supply across its full 4V–20V range?
Yes, LM2716MTX operates continuously across its specified 4V to 20V input voltage range. Its buck stage maintains 3.3V output down to 4V input (with reduced duty cycle), and its boost stage functions up to 20V input while delivering up to 20V output. The internal bandgap reference (1.26V) and error amplifiers are characterized across this full range, ensuring regulation accuracy and protection functionality at all operating points.
LM2716MTX 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-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
LM2716MTX FAQ
1.How can I place an order for LM2716MTX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2716MTX 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 LM2716MTX reliable?
The price and inventory of LM2716MTX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2716MTX is usually 5 days.
3.What payment methods are accepted for LM2716MTX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2716MTX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2716MTX?
LM2716MTX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2716MTX 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 LM2716MTX?
For technical support, including LM2716MTX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2716MTX requirements.
6.How does Aetrix verify that LM2716MTX is sourced from the original manufacturer or authorized distributors?
All LM2716MTX 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 LM2716MTX meets industry standards.
7.What is the process for return or replacement of LM2716MTX?
All LM2716MTX units undergo pre-shipment inspection (PSI). If there is an issue with LM2716MTX, 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 LM2716MTX part is unused and in its original packaging.
Return procedure for LM2716MTX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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