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Texas Instruments LM2703MF-ADJ/NOPB
- Part No.:
- LM2703MF-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2703MF-ADJ/NOPB.pdf
- Description:
- IC LED DRVR RGLTR 350MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:11,497
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Product details
Overview
LM2703MF-ADJ/NOPB from Texas Instruments is a micropower step-up DC/DC converter with integrated 350mA NMOS switch, adjustable output voltage up to 21V, 2.2V–7V input range, and 400ns fixed off-time control. It operates in SOT-23-5 package and delivers high efficiency for low-current LCD bias and white LED backlighting from single Li-Ion cells.
For engineers reviewing the LM2703MF-ADJ/NOPB datasheet, LM2703MF-ADJ/NOPB pinout, LM2703MF-ADJ/NOPB application, or LM2703MF-ADJ/NOPB equivalent, key selection criteria include feedback voltage accuracy (1.237V ±30mV), shutdown current (0.01µA), switch RDS(ON) (0.7Ω typ), thermal resistance (220°C/W), and compatibility with low-profile inductors like Coilcraft DT1608C-103.
Technical Context
The LM2703MF-ADJ/NOPB uses a constant off-time current-mode control architecture with internal 350mA peak-current-limited NMOS switch and 1.237V precision feedback reference. Its 400ns off-time enables use of small inductors and ceramic capacitors while maintaining stability across 2.2V–7V input and up to 21V output.
Operation relies on FB pin sensing via external resistor divider (R1/R2) to regulate output; SHDN pin provides active-low enable/disable with 0.3V low threshold and 1.1V high threshold. Undervoltage lockout engages below 1.8V input, and thermal shutdown activates at 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Adjustable up to 21V via external R1/R2 divider; set by VOUT = 1.237V × (1 + R1/R2). |
| Input Voltage Range | 2.2V to 7.0V - supports single-cell Li-Ion (2.5V–4.2V) and 3.3V/5V rail boosting. |
| Switch Current Limit | 275–400mA (typ 350mA) - defines maximum inductor peak current and load capability. |
| Feedback Voltage | 1.189V to 1.269V (typ 1.237V) - sets regulation accuracy and output tolerance under load/temperature. |
| Shutdown Current | 0.01µA (max 2.5µA) - enables ultra-low-power battery preservation during system sleep. |
| Switch RDS(ON) | 0.7Ω (typ), 1.6Ω (max) - directly impacts conduction loss and efficiency at light-to-moderate loads. |
| Thermal Resistance | θJA = 220°C/W - determines max power dissipation (e.g., 227mW at TA = 85°C, TJ(MAX) = 125°C). |
Pinout & Package
SOT-23-5 (DBV) package: 2.9mm × 1.6mm × 1.45mm body, gull-wing leads, RoHS-compliant matte tin lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch drain node | Connects to inductor and Schottky diode anode; high dv/dt node requiring minimal trace area to reduce EMI. |
| 2 - GND | Power and analog ground | Must tie directly to PCB ground plane; serves as return for switch current and feedback reference. |
| 3 - FB | Feedback voltage input | Senses output via resistor divider; 30–120nA bias current flows into pin; requires low-noise AGND connection. |
| 4 - SHDN | Active-low enable control | Pull ≥1.1V to enable; ≤0.3V to disable; draws ≤80nA when high, enabling direct GPIO interfacing. |
| 5 - VIN | Input supply input | Accepts 2.2–7V; must be bypassed with ≥4.7µF ceramic capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Configurable from ~2.5V to 21V using two external resistors - eliminates need for multiple fixed-output variants. |
| 400ns fixed off-time | Enables use of sub-2mm height inductors (e.g., Coilcraft DT1608C-103) and reduces board footprint in space-constrained portable designs. |
| 0.01µA shutdown current | Extends battery life in standby mode - critical for always-on sensors or infrequent-wake devices powered by coin cells or Li-Ion. |
| Integrated 350mA switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout complexity while maintaining >85% efficiency at 10mA load. |
| Input UVLO with 1.8V threshold | Prevents erratic operation during battery brownout; ensures clean start-up and graceful shutdown as Li-Ion discharges below 3.0V. |
Applications
| LCD Bias Supply | White LED Backlighting |
|---|---|
|
Use Scenario: Generating 12–20V bias for segment or dot-matrix LCD panels in handheld medical meters and industrial HMIs. IC Role / Device Role / Timing Role: Step-up regulator providing stable high-voltage, low-noise DC output with <10mV ripple at 15mA load. Use Value: Enables single-cell Li-Ion operation without external charge pump or transformer-based topology - reducing cost and EMI. |
Use Scenario: Driving 2–4串联 white LEDs (3.0–3.6V each) from 2.5–4.2V Li-Ion battery in feature phones and portable scanners. IC Role / Device Role / Timing Role: Constant-voltage boost converter regulating LED string voltage; FB pin monitors scaled output to maintain brightness. Use Value: Delivers >87% efficiency at 20mA per LED while maintaining <±2% output regulation across battery discharge cycle. |
| Handheld Instrumentation | Digital Camera Display |
|
Use Scenario: Powering analog front-end op-amps and ADC reference rails requiring 5V or ±5V derived from 3.3V main rail. IC Role / Device Role / Timing Role: Low-quiescent-current boost stage feeding LDO or charge pump; operates intermittently during measurement bursts. Use Value: Draws only 235µA operating current and 0.01µA in shutdown - extends runtime between calibrations or data uploads. |
Use Scenario: Supplying 15–18V to TFT-LCD backlight in compact digital cameras with tight height constraints (<1.5mm). IC Role / Device Role / Timing Role: High-frequency (≈1MHz effective) boost controller driving low-profile inductor and 1µF ceramic output cap. Use Value: Supports 10PH inductor and 1µF COUT - achieves full regulation in <5mm² layout area with no ferrite bead required. |
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 |
|---|---|---|---|
| TPS61022DRVR | Higher 2A switch current, 3.3V–5.5V input, fixed 5V output; no adjustable FB. | Better suited for higher-current USB-powered peripherals; not suitable for >12V outputs or Li-Ion direct boost. | Select when fixed 5V output and >100mA load are required; avoid if adjustable >12V or ultra-low IQ needed. |
| MAX17222ELT+T | 1.8V–5.5V input, 200mA switch, 0.9µA IQ, 1.215V FB; smaller 2mm × 2mm WLP-6 package. | Optimized for coin-cell and energy-harvesting; lower output voltage limit (≤10V typical); less robust under surge loads. | Prefer for sub-10V, sub-50mA applications where size and nanoamp IQ outweigh peak current needs. |
Compared with TPS61022DRVR and MAX17222ELT+T, the LM2703MF-ADJ/NOPB uniquely balances 21V adjustability, 350mA peak current, and 0.01µA shutdown in SOT-23-5 - making it optimal for Li-Ion-powered LCD bias and multi-LED strings where both voltage headroom and quiescent power matter.
Availability
LM2703MF-ADJ/NOPB is available at Aetrix Electronics and suitable for LCD bias supplies, white LED backlighting, handheld instrumentation, digital camera displays, and portable medical devices requiring stable component supply with long-term manufacturability.
Supply support for LM2703MF-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 over 50 years of innovation in energy-efficient power conversion and signal conditioning.
The LM2703MF-ADJ/NOPB belongs to TI's micropower DC/DC converter product line, engineered specifically for space- and battery-constrained portable electronics needing high-voltage, low-IQ boost functionality in minimal footprint.
FAQ
What is the maximum output voltage achievable with LM2703MF-ADJ/NOPB?
The LM2703MF-ADJ/NOPB supports output voltages up to 21V, limited by its 22V-rated internal switch and absolute maximum SW pin voltage rating. This is achieved using an external resistor divider on the FB pin, where VOUT = 1.237V × (1 + R1/R2). Designers must ensure external components (diode, capacitor, inductor) are rated for the selected output voltage.
Can LM2703MF-ADJ/NOPB operate from a single alkaline cell?
No - the LM2703MF-ADJ/NOPB requires a minimum input voltage of 2.2V, and a fresh alkaline cell starts at ~1.6V and drops rapidly under load. It is designed for single Li-Ion (2.5–4.2V), LiFePO4, or regulated 3.3V/5V rails. Using it with alkaline would result in UVLO activation and no regulation.
What is the recommended inductor for LM2703MF-ADJ/NOPB in a 20V output, 15mA load application?
For 20V output from 3.3V input at 15mA, TI recommends Coilcraft DT1608C-103 (10µH, 380mA saturation) or Murata LQY33PN100M02. These low-profile (≤1.2mm height), shielded inductors match the LM2703MF-ADJ/NOPB's 400ns off-time and 350mA current limit while minimizing EMI and board area.
How does the FB pin bias current affect output accuracy in LM2703MF-ADJ/NOPB designs?
The LM2703MF-ADJ/NOPB FB pin draws 30–120nA into the pin, which flows through the lower feedback resistor R2. To limit voltage error to <0.5%, R2 should be ≤200kΩ (e.g., 33kΩ used in typical 20V design). Higher R2 values increase sensitivity to leakage and noise, degrading regulation accuracy.
Is LM2703MF-ADJ/NOPB pin-compatible with other SOT-23-5 boost converters like the LM2704?
No - the LM2703MF-ADJ/NOPB has unique pin mapping: Pin 1=SW, Pin 2=GND, Pin 3=FB, Pin 4=SHDN, Pin 5=VIN. The LM2704 uses different pinout (e.g., SHDN on Pin 2), and its internal architecture differs (different current limit, off-time, and UVLO). Direct replacement requires PCB redesign and validation.
LM2703MF-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.2V
- Voltage - Supply (Max):
- 7V
- Voltage - Output:
- 21V
- Current - Output / Channel:
- 350mA (Switch)
- Frequency:
- -
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2703MF-ADJ/NOPB FAQ
1.How can I place an order for LM2703MF-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2703MF-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 LM2703MF-ADJ/NOPB reliable?
The price and inventory of LM2703MF-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 LM2703MF-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2703MF-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2703MF-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2703MF-ADJ/NOPB?
LM2703MF-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2703MF-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 LM2703MF-ADJ/NOPB?
For technical support, including LM2703MF-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2703MF-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2703MF-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2703MF-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 LM2703MF-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2703MF-ADJ/NOPB?
All LM2703MF-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2703MF-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 LM2703MF-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2703MF-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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