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Texas Instruments LM2700LDX-ADJ/NOPB
- Part No.:
- LM2700LDX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM2700LDX-ADJ/NOPB.pdf
- Description:
- IC REG BOOST ADJ 2.55A 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,207
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Product details
Overview
LM2700LDX-ADJ/NOPB from Texas Instruments is a step-up PWM DC/DC converter with an integrated 3.6A, 80mΩ NMOS switch, pin-selectable 600kHz/1.25MHz switching frequency, adjustable output voltage up to 17.5V, and input voltage range of 2.2V to 12V. It delivers up to 500mA at 8V from a single Li-ion cell and is engineered for LCD bias supplies in portable displays.
For engineers reviewing the LM2700LDX-ADJ/NOPB datasheet, LM2700LDX-ADJ/NOPB pinout, LM2700LDX-ADJ/NOPB application, or LM2700LDX-ADJ/NOPB equivalent, key selection criteria include its current-mode PWM architecture, dual-frequency selectability, internal compensation flexibility via VC pin, thermal/UV/OV protection, and WSON-14 package suitability for space-constrained handheld designs.
Technical Context
The LM2700LDX-ADJ/NOPB implements a current-mode PWM control scheme with dual feedback loops: one sensing switch current and another monitoring output voltage via the FB pin (1.26V reference). Its ramp compensation eliminates sub-harmonic oscillation above 50% duty cycle, enabling stable operation up to 85% maximum duty cycle.
It integrates dedicated protection circuitry including thermal shutdown (150°C junction limit), input undervoltage lockout (UVP thresholds: 1.95–2.2V on, 1.85–2.1V off), and overvoltage protection (OVP) to prevent no-load output runaway. Shutdown mode reduces supply current to 5µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Current Limit | 2.55–4.3A typ/max; sets peak inductor current and defines maximum load capability under heavy transient conditions. |
| Feedback Voltage | 1.2285–1.2915V; precise reference used with external resistor divider to set output voltage per VOUT = 1.26 × (1 + RFB1/RFB2). |
| Switching Frequency | 480–720kHz (FSLCT = GND) or 1–1.5MHz (FSLCT = VIN); enables layout optimization for EMI filtering and capacitor size reduction. |
| RDS(ON) | 80–150mΩ at VIN = 2.7V, ISW = 2A; determines conduction loss and thermal performance at high load currents. |
| Quiescent Current | 2.0mA (600kHz, active), 3.0mA (1.25MHz, active), 5µA (shutdown); directly impacts battery runtime in always-on or low-power states. |
| Input Voltage Range | 2.2V to 12V; supports single-cell Li-ion (2.7–4.2V), 3.3V/5V rails, and multi-cell alkaline/NiMH sources without pre-regulation. |
| Max Output Voltage | 17.5V; sufficient for triple-output TFT LCD bias generation (e.g., AVDD, VGH, VGL) requiring >15V rails. |
Pinout & Package
LM2700LDX-ADJ/NOPB is housed in a thermally enhanced 14-pin WSON (NHE) package with exposed thermal pad, offering 45°C/W θJA and compatibility with standard reflow profiles (MSL Level-3, 260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Compensation network connection | Output of error amplifier; connects to RC/CC network to set dominant pole-zero pair for loop stability. |
| FB | Output voltage feedback input | Senses divided output voltage; compares to 1.26V internal reference to regulate output. |
| SHDN | Shutdown control input | Active-low enable; pulls <0.3V to enter 5µA shutdown mode; requires ≥0.9V to operate. |
| AGND | Analog ground | Reference for FB, VC, and internal analog circuitry; must tie directly to PGND at package. |
| PGND | Power ground (x3 pins) | Return path for switch current; all three PGND pins must be connected together at the IC footprint. |
| SW | Power switch node (x3 pins) | Drain of internal NMOS; connects to inductor and Schottky diode anode; carries high di/dt switching current. |
| VIN | Analog power input | Supplies internal circuitry and gate drive; bypassed with ≥10µF ceramic capacitor near pin. |
| FSLCT | Frequency select input | GND = 600kHz, VIN = 1.25MHz; selects oscillator frequency without external components. |
| NC (x2) | No connect | Pins 11 and 14 are unconnected internally; Pin 14 must be grounded per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.6A, 80mΩ NMOS switch | Eliminates external MOSFET and driver, reducing BOM count and PCB area while maintaining ≤2.5A continuous output capability. |
| Pin-selectable 600kHz/1.25MHz operation | Enables trade-off between efficiency (lower fS) and component size (higher fS) without changing layout or compensation. |
| Adjustable output up to 17.5V | Supports wide-range bias generation for LCD panels, OLED drivers, and PMOLED display stacks requiring >15V rails. |
| Internal compensation via VC pin | Allows full customization of loop dynamics using RC/CC network to optimize transient response and stability across load/line variations. |
| Thermal, UV, and OV protection | Ensures robust operation during startup, overload, or input brownout without external supervision circuitry. |
Applications
| Handheld LCD Bias | GSM/CDMA Phone Power |
|---|---|
Use Scenario: Generating +8V and −5V bias rails for monochrome or color STN/TFT LCD modules in feature phones. IC Role / Device Role / Timing Role: Primary boost regulator providing regulated positive high-voltage rail; operates at 600kHz for optimal efficiency and low EMI. Use Value: Delivers 500mA at 8V from 3.3V input with <75% efficiency, eliminating need for discrete charge-pump or transformer-based solutions. | Use Scenario: Supplying AVDD (12V) and VGH (15V) for RF front-end ICs and display subsystems in 2G/3G mobile handsets. IC Role / Device Role / Timing Role: High-efficiency step-up converter operating at 1.25MHz to minimize inductor size and meet tight board area constraints. Use Value: Achieves >80% efficiency at 200mA load with 2.2µH inductor, enabling compact 14-pin WSON footprint compatible with QFN assembly processes. |
| Digital Camera Backlight | Portable Medical Display |
Use Scenario: Driving white LED strings or electroluminescent (EL) panels requiring 12–15V bias in compact digital cameras. IC Role / Device Role / Timing Role: Adjustable-output boost controller with fast transient response to support dynamic backlight dimming. Use Value: Maintains ±1% output regulation during 100mA–500mA load steps due to current-mode control and optimized VC compensation. | Use Scenario: Providing stable, low-noise bias for high-resolution medical-grade LCDs in portable ultrasound or patient monitors. IC Role / Device Role / Timing Role: Low-quiescent-current (2mA @ 600kHz) boost converter supporting battery-only operation with >10-hour runtime. Use Value: Combines input UVLO (1.95V) and thermal shutdown to ensure fail-safe behavior during extended field use and temperature excursions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 8A switch current, 2.7–12V input, fixed 500kHz/2MHz frequency, no VC pin for external compensation. | Better suited for >1A loads and fixed-frequency noise-sensitive systems; lacks analog compensation flexibility. | Select when higher output current (>500mA) and simplified layout outweigh need for fine-tuned loop response. |
| MAX17062ETA+ | 2.5A switch, 2.5–5.5V input only, 1.2MHz fixed frequency, integrated soft-start, no FSLCT pin. | Limited to low-input-voltage applications; optimized for single Li-ion but cannot support 12V input or 17.5V output. | Choose for cost-sensitive, low-VIN designs where 12V operation and 17.5V output are not required. |
Compared with TPS61088RHLR and MAX17062ETA+, the LM2700LDX-ADJ/NOPB offers unique flexibility in frequency selection, analog compensation tuning, and wide 2.2–12V input range-making it optimal for multi-rail LCD bias where stability, efficiency, and design adaptability are critical.
Availability
LM2700LDX-ADJ/NOPB is available at Aetrix Electronics and suitable for handheld devices, portable medical displays, and GSM/CDMA phone power management requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for LM2700LDX-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 precision power solutions.
The LM2700 product line was designed specifically for compact, high-efficiency boost conversion in portable electronics-emphasizing low quiescent current, integrated protection, and flexible compensation for LCD bias and display power applications.
FAQ
What is the maximum output voltage supported by the LM2700LDX-ADJ/NOPB?
The LM2700LDX-ADJ/NOPB supports an adjustable output voltage up to 17.5V, as specified in the Absolute Maximum Ratings and confirmed in the Electrical Characteristics table. This is achieved using an external resistor divider on the FB pin with the internal 1.26V reference, enabling configurations such as 12V for TFT AVDD or 15V for VGH in LCD bias applications. Operation beyond 17.5V risks damage to the SW pin, rated for 18V maximum.
How does the FSLCT pin configure switching frequency on the LM2700LDX-ADJ/NOPB?
The FSLCT pin on the LM2700LDX-ADJ/NOPB selects between two fixed switching frequencies: grounding FSLCT sets 600kHz operation (480–720kHz typical range), while connecting FSLCT to VIN selects 1.25MHz (1–1.5MHz typical range). This pin requires no external components and directly controls the oscillator-enabling rapid layout reuse across efficiency- vs. size-optimized designs without modifying compensation or magnetics.
Can the LM2700LDX-ADJ/NOPB operate from a single 1.5V alkaline cell?
No, the LM2700LDX-ADJ/NOPB cannot operate from a single 1.5V alkaline cell. Its minimum operating input voltage is 2.2V, and its undervoltage lockout (UVP) activates below 1.85–2.1V. A fresh alkaline cell starts at ~1.6V and drops rapidly under load; even two cells in series (3.0V nominal) may fall below 2.2V before end-of-life. The device is validated for single Li-ion (2.7–4.2V), 3.3V logic rails, or multi-cell NiMH/alkaline configurations meeting the 2.2V minimum.
What is the purpose of the VC pin on the LM2700LDX-ADJ/NOPB, and how is it used?
The VC pin on the LM2700LDX-ADJ/NOPB is the output of the internal error amplifier and serves as the compensation node for the voltage control loop. It is connected to an external RC/CC network (e.g., 10kΩ + 1nF) to place a dominant pole and zero, stabilizing the current-mode boost converter across load and line variations. Unlike fixed-compensation regulators, this pin allows designers to tailor loop bandwidth and phase margin-critical for achieving clean transient response in LCD bias applications.
Does the LM2700LDX-ADJ/NOPB support forced PWM mode at light loads?
Yes, the LM2700LDX-ADJ/NOPB operates in continuous conduction mode (CCM) at light loads and does not skip pulses or enter burst mode. Its datasheet confirms "continuous switching at light loads" with quiescent current of 2.0mA at 600kHz and 3.0mA at 1.25MHz-indicating fixed-frequency PWM operation across the full load range. This ensures low output voltage ripple and predictable EMI behavior, essential for noise-sensitive LCD bias rails.
LM2700LDX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-WSON (4x4)
LM2700LDX-ADJ/NOPB FAQ
1.How can I place an order for LM2700LDX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2700LDX-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 LM2700LDX-ADJ/NOPB reliable?
The price and inventory of LM2700LDX-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 LM2700LDX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2700LDX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2700LDX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2700LDX-ADJ/NOPB?
LM2700LDX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2700LDX-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 LM2700LDX-ADJ/NOPB?
For technical support, including LM2700LDX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2700LDX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2700LDX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2700LDX-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 LM2700LDX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2700LDX-ADJ/NOPB?
All LM2700LDX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2700LDX-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 LM2700LDX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2700LDX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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