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Texas Instruments LM2700MT-ADJ
- Part No.:
- LM2700MT-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2700MT-ADJ.pdf
- Description:
- IC REG BOOST ADJ 2.55A 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,384
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Product details
Overview
LM2700MT-ADJ from Texas Instruments is a pin-selectable-frequency, adjustable-output boost DC/DC converter with an integrated 3.6A/80mΩ NMOS switch, operating from 2.2V to 12V input and delivering up to 17.5V output. It supports 600kHz or 1.25MHz switching, features internal overtemperature and input undervoltage protection, and targets LCD bias generation in portable electronics.
For engineers reviewing the LM2700MT-ADJ datasheet, LM2700MT-ADJ pinout, LM2700MT-ADJ application, or LM2700MT-ADJ equivalent, key selection criteria include its adjustable feedback threshold (1.26V), dual-frequency selectability via FSLCT pin, continuous conduction mode operation, thermal shutdown behavior, and TSSOP-14 package layout constraints for high-current SW/PGND routing.
Technical Context
The LM2700MT-ADJ implements current-mode PWM control with a dedicated VC compensation pin enabling external RC/CC network tuning for stability across load and duty-cycle variations. Its architecture includes ramp compensation to suppress subharmonic oscillation above 50% duty cycle and integrates separate AGND and PGND pins to isolate analog sensing from power-switch noise.
It delivers regulated output using a resistor divider on FB referenced to a precise 1.26V internal bandgap, supports shutdown with 5µA quiescent current, and maintains stable operation under input transients via built-in UVP with 2.0V ±0.1V thresholds and OVP clamping at no-load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 12V - supports single Li-ion, multi-cell alkaline, or USB-powered systems without pre-regulation. |
| Output Voltage Range | Adjustable up to 17.5V - set via external resistor divider on FB pin; enables TFT LCD VGH/VGL bias generation. |
| Switch Current Limit | 2.55A to 4.3A (typ. 3.6A) - defines maximum inductor peak current and short-circuit robustness. |
| Switch RDS(ON) | 80mΩ (typ.) at VIN = 2.7V - determines conduction loss and thermal rise under full load. |
| Quiescent Current | 2.0mA (600kHz), 3.0mA (1.25MHz) - sets light-load efficiency floor and battery runtime impact. |
| Feedback Voltage | 1.2285V to 1.2915V (typ. 1.26V) - precision reference for output regulation accuracy and line/load transient response. |
| Thermal Shutdown | Activates at ~150°C junction temperature - protects die during sustained overload or poor PCB thermal design. |
Pinout & Package
LM2700MT-ADJ is supplied in a 14-lead TSSOP package (MT suffix per TI ordering nomenclature), with exposed thermal pad for enhanced heat dissipation. Pin 1 is VC; pins 5–7 and 8–10 are dedicated PGND and SW terminals respectively to minimize loop inductance and voltage spikes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VC) | Compensation network connection | Connects to error amplifier output; external RC/CC network here sets dominant pole-zero pair for loop stability. |
| 2 (FB) | Output voltage feedback input | Senses divided output voltage; internal 1.26V reference sets regulation point; high-impedance node requiring short trace routing. |
| 3 (SHDN) | Active-low shutdown control | Pulls <0.6V to enter 5µA shutdown; >0.9V to enable operation; compatible with logic-level microcontrollers. |
| 4 (AGND) | Analog ground reference | Reference for FB, VC, and internal bandgap; must tie directly to PGND at package to avoid noise coupling. |
| 5–7 (PGND) | Power ground return | Low-impedance return path for switch current; all three pins must be connected together at the IC footprint. |
| 8–10 (SW) | Switch node connection | Drives external inductor; high di/dt node requiring minimized trace area and proximity to PGND pins. |
| 11 (NC) | No internal connection | Not bonded; leave unconnected or float; avoid routing signals nearby to prevent parasitic coupling. |
| 12 (VIN) | Analog power input | Supplies internal circuitry and gate drive; requires local 10µF+ low-ESR ceramic bypass capacitor. |
| 13 (FSLCT) | Frequency select input | GND = 600kHz, VIN = 1.25MHz; sets oscillator frequency and impacts inductor size, EMI profile, and light-load efficiency. |
| 14 (NC) | Internally grounded terminal | TI recommends connecting to system ground; improves thermal performance and reduces EMI susceptibility. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.6A/80mΩ NMOS switch | Eliminates external MOSFET and driver, reducing BOM count and board space while limiting conduction loss to <150mW at 2A load. |
| Pin-selectable 600kHz / 1.25MHz operation | Enables optimization between inductor size (smaller at 1.25MHz) and efficiency (higher at 600kHz), supporting compact or low-noise designs. |
| Dual-ground architecture (AGND/PGND) | Prevents switching noise from corrupting feedback and compensation paths, improving regulation accuracy and transient immunity. |
| External compensation via VC pin | Allows full customization of loop dynamics using RC/CC network to stabilize across wide output capacitance and ESR ranges. |
| Continuous conduction mode at light loads | Maintains regulation down to ~100mA without pulse-skipping, ensuring low-output-ripple performance in sensitive analog bias applications. |
Applications
| Handheld LCD Bias | GSM/CDMA Phone Display Supply |
|---|---|
Use Scenario: Powering VGH and VGL rails for monochrome or color STN/TFT LCD panels in battery-operated handhelds. IC Role / Device Role / Timing Role: Adjustable boost regulator generating stable high-voltage bias from 3.3V or 3.7V Li-ion source. Use Value: Delivers 8V–12V outputs with <±2% regulation over temperature and load, enabling consistent contrast and grayscale fidelity. | Use Scenario: Providing programmable high-side gate drive and negative bias for display driver ICs in 2G/3G mobile handsets. IC Role / Device Role / Timing Role: Dual-rail DC/DC converter supporting dynamic VCOM adjustment and fast panel refresh rates. Use Value: 1.25MHz option allows <2.2µH inductors, reducing solution size by >30% versus 600kHz alternatives without sacrificing startup time. |
| Digital Camera Backlight Driver | Portable Medical Instrument Display |
Use Scenario: Driving white LED strings or LCD backlights requiring >10V from single-cell batteries in compact imaging devices. IC Role / Device Role / Timing Role: High-efficiency step-up controller with low quiescent current to extend battery life during standby and capture modes. Use Value: 2.0mA IQ at 600kHz enables >100-hour standby on 800mAh battery while maintaining instant-on capability. | Use Scenario: Generating isolated, low-noise bias voltages for touch-screen controllers and high-resolution diagnostic displays in field-deployable medical tools. IC Role / Device Role / Timing Role: Precision-adjustable boost converter with thermal shutdown and UVLO to ensure fail-safe operation in critical environments. Use Value: Overtemperature protection triggers before junction exceeds 125°C, preventing system reset or data corruption during extended use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27313SDX/NOPB | Higher 1.6MHz fixed frequency; 1.2A switch; smaller 6-pin WSON package; no VC pin for external compensation. | Better suited for ultra-compact, low-power applications where board space is constrained and output current ≤1.2A. | Select when footprint reduction and simplified layout outweigh need for adjustable frequency or external loop tuning. |
| TPS61088RHLR | 10A switch; 2.5V–12V input; 4.5V–18.5V output; integrated soft-start; higher efficiency at >1A loads. | Targets high-current applications like multi-display systems or industrial HMIs requiring >2.5A output. | Choose when output current demand exceeds 2.5A or when integrated soft-start and lower RDS(ON) are required for thermal margin. |
Compared with LM2700MT-ADJ, LM27313SDX/NOPB offers smaller size and higher frequency but sacrifices current capability and compensation flexibility, while TPS61088RHLR provides greater output current and integration at the cost of larger package and higher BOM cost-making LM2700MT-ADJ optimal for mid-power, thermally constrained LCD bias designs requiring design adaptability.
Availability
LM2700MT-ADJ is available at Aetrix Electronics and suitable for handheld devices, portable medical instruments, and digital camera power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2700MT-ADJ 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 decades of expertise in high-reliability DC/DC conversion solutions.
The LM2700 product line was designed specifically for portable LCD bias applications requiring compact, efficient, and thermally robust step-up conversion from single-cell battery sources.
FAQ
What is the recommended inductor value for LM2700MT-ADJ operating at 600kHz?
A 4.7µH inductor is recommended for most 600kHz applications per TI's design guidelines. This value ensures stable continuous conduction mode operation across typical input/output combinations (e.g., 3.3V to 8V), avoids subharmonic oscillation, and balances size versus efficiency. For higher duty cycles approaching 85%, TI advises increasing inductance up to 2× to maintain loop stability.
How does the FSLCT pin affect LM2700MT-ADJ performance in real-world layouts?
The FSLCT pin directly selects switching frequency: grounding it configures LM2700MT-ADJ for 600kHz operation, while tying it to VIN selects 1.25MHz. At 1.25MHz, layout demands tighter control of SW/PGND loop area and shorter traces to manage higher di/dt-induced EMI; at 600kHz, larger inductors reduce core loss but require more board space. Both modes retain identical regulation accuracy and protection features.
Can LM2700MT-ADJ safely drive a 17.5V output into a 100mA load from a 2.7V input?
Yes - LM2700MT-ADJ supports output voltages up to 17.5V with input as low as 2.2V. At VIN = 2.7V and VOUT = 17.5V, the required duty cycle is ~85%, which remains within the device's specified 78–85% maximum range. The internal 3.6A switch and 80mΩ RDS(ON) provide ample headroom for 100mA output current, and thermal shutdown ensures safe operation even under worst-case ambient conditions.
What is the function of the VC pin on LM2700MT-ADJ, and why is external compensation necessary?
VC is the voltage error amplifier output pin used to connect an external RC/CC compensation network. External compensation is necessary because LM2700MT-ADJ's current-mode architecture introduces a right-half-plane zero that limits phase margin; the RC/CC network places a dominant pole and zero to stabilize the control loop across varying output capacitance, ESR, and load conditions - especially critical for ceramic capacitors with near-zero ESR.
Does LM2700MT-ADJ require separate AGND and PGND connections on the PCB, and what happens if they are tied remotely?
Yes - LM2700MT-ADJ mandates separate AGND and PGND pins tied together *only at the IC package*, not at a remote star ground. If AGND and PGND are joined remotely, high di/dt switching currents flowing through PGND traces induce voltage spikes onto AGND, corrupting FB and VC references. This causes output regulation drift, increased ripple, and potential instability - TI explicitly warns against this in Layout Considerations section of the datasheet.
LM2700MT-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.2V
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 1.26V
- Voltage - Output (Max):
- 17.5V
- Current - Output:
- 2.55A (Switch)
- Frequency - Switching:
- 600kHz, 1.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
LM2700MT-ADJ FAQ
1.How can I place an order for LM2700MT-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2700MT-ADJ 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 LM2700MT-ADJ reliable?
The price and inventory of LM2700MT-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2700MT-ADJ is usually 5 days.
3.What payment methods are accepted for LM2700MT-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2700MT-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2700MT-ADJ?
LM2700MT-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2700MT-ADJ 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 LM2700MT-ADJ?
For technical support, including LM2700MT-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2700MT-ADJ requirements.
6.How does Aetrix verify that LM2700MT-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2700MT-ADJ 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 LM2700MT-ADJ meets industry standards.
7.What is the process for return or replacement of LM2700MT-ADJ?
All LM2700MT-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2700MT-ADJ, 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 LM2700MT-ADJ part is unused and in its original packaging.
Return procedure for LM2700MT-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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