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Texas Instruments LM2700LD-ADJ
- Part No.:
- LM2700LD-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM2700LD-ADJ.pdf
- Description:
- IC REG BOOST ADJ 2.55A 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,266
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Product details
Overview
LM2700LD-ADJ 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–12V. It delivers up to 500mA at 8V from a single Li-ion cell and is engineered for LCD bias supplies in portable electronics.
For engineers reviewing the LM2700LD-ADJ datasheet, LM2700LD-ADJ pinout, LM2700LD-ADJ application, or LM2700LD-ADJ equivalent, key selection criteria include its adjustable feedback threshold (1.26V), thermal shutdown protection, input undervoltage lockout (1.95V–2.2V), low-quiescent-current shutdown mode (5µA), and dual-package availability (WSON-14).
Technical Context
The LM2700LD-ADJ employs current-mode PWM control with internal ramp compensation to suppress sub-harmonic oscillation above 50% duty cycle. Its VC pin enables external compensation network tuning for stability across load and input variations, supporting ceramic output capacitors as low as 10µF.
It integrates dedicated protection circuitry: thermal shutdown (150°C junction limit), input undervoltage protection (UVP comparator with hysteresis), and overvoltage protection (OVP) to prevent no-load output runaway. Shutdown logic reduces supply current to 5µA, and FSLCT pin selects between 600kHz (ground) and 1.25MHz (VIN) operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch RDS(ON) | 80 mΩ typ. at VIN = 2.7V, ISW = 2A - enables high-efficiency boost conversion with minimal conduction loss. |
| Feedback Voltage | 1.26 V ±1.2% - sets precise output voltage via external resistor divider; determines VOUT = 1.26 × (1 + RFB1/RFB2). |
| Switch Current Limit | 2.55–4.3 A - protects internal NMOS during overload or short-circuit; varies with input voltage and duty cycle. |
| Quiescent Current | 2.0 mA at 600kHz (switching), 3.0 mA at 1.25MHz - defines light-load efficiency and battery runtime in portable systems. |
| Input Voltage Range | 2.2 V to 12 V - supports single-cell Li-ion (2.7–4.2V), 3.3V/5V rails, and multi-cell alkaline/NiMH sources. |
| Output Voltage Range | Adjustable up to 17.5 V - sufficient for TFT-LCD VPOS/VNEG bias generation and white LED strings. |
| Thermal Resistance (θJA) | 45 °C/W (WSON package) - enables higher continuous power delivery than TSSOP (150 °C/W) under same PCB layout. |
Pinout & Package
LM2700LD-ADJ is packaged in a thermally enhanced 14-pin WSON (NHE) package with exposed thermal pad, optimized for compact portable designs requiring high power density and efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Compensation network connection | Connects to error amplifier output; RC/CC network here sets loop stability poles/zeros for transient response optimization. |
| FB | Output voltage feedback input | Senses divided output voltage; internal 1.26V reference compares against this node to regulate VOUT. |
| SHDN | Active-low shutdown control | Pulls low to disable switching and reduce supply current to 5µA; high-Z when not asserted. |
| AGND | Analog ground reference | Reference for FB, VC, and internal analog circuitry; must be tied directly to PGND at package pin to minimize noise coupling. |
| PGND (Pins 5,6,7) | Power ground return | Low-impedance return path for switch current; all three pins must be connected together at the IC for optimal EMI and thermal performance. |
| SW (Pins 8,9,10) | Switch node connection | Drives external inductor and Schottky diode; carries high di/dt current; requires short, wide traces to minimize ringing. |
| VIN | Analog power input | Supplies internal circuitry and gate drive; bypass capacitor must be placed adjacent to this pin. |
| FSLCT | Frequency select input | Ground → 600kHz; connect to VIN → 1.25MHz; selects switching frequency without external components. |
| NC (Pins 11,14) | No-connect terminals | Pin 11 is unconnected internally; Pin 14 must be connected to ground per datasheet recommendation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.6A, 80mΩ NMOS switch | Eliminates external MOSFET and driver, reducing BOM count and board area while enabling >85% efficiency at 500mA output. |
| Pin-selectable 600kHz / 1.25MHz operation | Enables trade-off between inductor size (smaller at 1.25MHz) and efficiency (higher at 600kHz); no external clock required. |
| External compensation (VC pin) | Allows full customization of loop dynamics using RC/CC network - critical for stable operation with low-ESR ceramic capacitors. |
| Input undervoltage lockout (UVP) | Prevents erratic startup/shutdown by disabling regulation below 1.95V and re-enabling above 2.05V - protects battery and system integrity. |
| Thermal shutdown with hysteresis | Disables switching at 150°C junction temperature and resumes only after die cools by ~20°C - prevents permanent damage during sustained overload. |
Applications
| Handheld LCD Bias | GSM/CDMA Phone Power |
|---|---|
Use Scenario: Generating +8V and −5V bias rails for TFT-LCD modules in smartphones and PDAs using a single 3.3V or Li-ion source. IC Role / Device Role / Timing Role: Primary step-up regulator controlling inductor current and output voltage via current-mode PWM; provides regulated, low-noise DC bias. Use Value: Enables compact, high-efficiency dual-rail generation without transformers or charge pumps; supports fast load transients during display updates. | Use Scenario: Supplying backlight LED strings and RF power amplifier bias in 2G/3G mobile handsets operating from 3.6V nominal battery. IC Role / Device Role / Timing Role: Adjustable-output boost converter delivering up to 17.5V at 200mA; synchronized via FSLCT to avoid interference with GSM burst timing. Use Value: Delivers stable high-voltage rail with <2.0mA quiescent current in 600kHz mode - extends talk time and maintains RF performance. |
| Digital Camera Flash Driver | Portable Medical Display |
Use Scenario: Charging high-voltage capacitors for xenon flash circuits in compact digital cameras powered by two AA cells (2.4–3.2V). IC Role / Device Role / Timing Role: High-current boost controller charging storage capacitor to 300V via external voltage multiplier; operates in discontinuous mode during charge phase. Use Value: Leverages 3.6A switch current limit and 17.5V absolute max SW rating to safely drive cascaded multiplier stages with fast charge cycles. | Use Scenario: Providing isolated, low-noise +12V and −12V rails for OLED/LCD panels in battery-powered patient monitors and handheld diagnostics devices. IC Role / Device Role / Timing Role: Dual-output boost solution (using multiple LM2700LD-ADJ units) delivering tightly regulated bias with <1% line/load regulation. Use Value: Meets medical-grade reliability requirements via built-in OVP, UVP, and thermal shutdown - eliminates need for external supervision ICs. |
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 10A switch current limit, fixed 500kHz/1MHz frequency, no VC pin for external compensation. | Better suited for high-current loads (>1A); lacks fine loop tuning capability for ultra-low-noise bias rails. | Select when peak output current exceeds 500mA and external compensation is not required. |
| MAX17062ETA+ | Fixed 1.2MHz frequency, integrated soft-start, lower 2.5A switch current, different pinout and compensation architecture. | Optimized for space-constrained LCD bias with integrated fault reporting; less flexible for custom transient response tuning. | Select when board space is critical and standard 1.2MHz operation suffices without VC-based loop optimization. |
Compared with TPS61088RHLR and MAX17062ETA+, the LM2700LD-ADJ offers unique VC-based loop compensation for precision stability across wide load/input ranges, lower quiescent current in 600kHz mode (2.0mA vs. ≥3.5mA), and dual-frequency flexibility - making it preferred for noise-sensitive, battery-limited LCD bias where design margin and tuning control are essential.
Availability
LM2700LD-ADJ is available at Aetrix Electronics and suitable for handheld LCD bias, GSM/CDMA phone power, and portable medical display applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2700LD-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 and medium-power step-up applications, emphasizing integration, thermal robustness in WSON packaging, and flexible frequency/compensation control for compact battery-powered systems.
FAQ
What is the maximum output voltage achievable with the LM2700LD-ADJ?
The LM2700LD-ADJ supports an adjustable output voltage up to 17.5V, limited by its absolute maximum SW pin voltage rating. This is achieved using an external resistor divider on the FB pin, where VOUT = 1.26 × (1 + RFB1/RFB2). The device maintains regulation across input voltages from 2.2V to 12V and load currents up to 500mA at typical output levels like 8V.
How does the FSLCT pin affect switching frequency in the LM2700LD-ADJ?
The FSLCT pin on the LM2700LD-ADJ selects between two fixed switching frequencies: grounding FSLCT configures 600kHz operation (typ. 480–720kHz), while connecting it to VIN selects 1.25MHz (typ. 1–1.5MHz). This pin has no analog function - it is a digital-level input referenced to VIN, and its state directly controls the oscillator's timing circuit without requiring external components.
Can the LM2700LD-ADJ operate in shutdown mode with zero load, and what is its quiescent current?
Yes, the LM2700LD-ADJ enters ultra-low-power shutdown mode when SHDN is pulled low, reducing total supply current to 5µA regardless of load condition. In this state, the internal NMOS switch is disabled, VC and FB pins are high-impedance, and output voltage decays passively through the feedback divider and load. This makes LM2700LD-ADJ suitable for battery-backed systems requiring extended standby life.
What is the purpose of the VC pin on the LM2700LD-ADJ, and how is it used in practice?
The VC pin on the LM2700LD-ADJ is the voltage error amplifier output, providing access to the internal control loop for external compensation. Engineers connect a series RC/CC network from VC to AGND to set dominant pole-zero pairs that stabilize the current-mode boost topology - especially critical for damping right-half-plane zero effects and ensuring >45° phase margin with ceramic output capacitors.
Does the LM2700LD-ADJ require separate AGND and PGND connections, and why?
Yes, the LM2700LD-ADJ mandates separate AGND (Pin 4) and PGND (Pins 5,6,7) connections, which must be tied together only at the IC package. This separation isolates sensitive analog reference circuitry from high-di/dt power return paths, preventing ground bounce and noise injection into the FB and VC nodes - a requirement confirmed in the Layout Considerations section of the SNVS152C datasheet.
LM2700LD-ADJ 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)
LM2700LD-ADJ FAQ
1.How can I place an order for LM2700LD-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2700LD-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 LM2700LD-ADJ reliable?
The price and inventory of LM2700LD-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2700LD-ADJ is usually 5 days.
3.What payment methods are accepted for LM2700LD-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2700LD-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2700LD-ADJ?
LM2700LD-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2700LD-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 LM2700LD-ADJ?
For technical support, including LM2700LD-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2700LD-ADJ requirements.
6.How does Aetrix verify that LM2700LD-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2700LD-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 LM2700LD-ADJ meets industry standards.
7.What is the process for return or replacement of LM2700LD-ADJ?
All LM2700LD-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2700LD-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 LM2700LD-ADJ part is unused and in its original packaging.
Return procedure for LM2700LD-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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