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Texas Instruments LM2703MF-ADJ-TI
- Part No.:
- LM2703MF-ADJ-TI
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
LM2703MF-ADJ-TI.pdf
- Description:
- SWITCHING REG, VOLTAGE-MODE, 0.4
- Quantity:
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Inventory:25,992
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Product details
Overview
LM2703MF-ADJ-TI from Texas Instruments (formerly National Semiconductor) is a micropower step-up DC/DC converter with an integrated 350mA/0.7Ω NMOS switch, adjustable output up to 21V, 2.2V–7V input range, and 400ns fixed off-time control. It delivers high efficiency in space-constrained portable applications such as white LED backlighting for single-cell Li-Ion systems.
For engineers reviewing the LM2703MF-ADJ-TI datasheet, LM2703MF-ADJ-TI pinout, LM2703MF-ADJ-TI application, or LM2703MF-ADJ-TI equivalent, key selection criteria include feedback voltage accuracy (1.237V ±28mV), shutdown current (0.01µA), thermal resistance (220°C/W), and SOT-23-5 package compatibility with low-profile magnetics.
Technical Context
The LM2703MF-ADJ-TI employs a constant off-time, current-limited control architecture with internal bandgap reference and enable comparator. Its 400ns off-time enables use of sub-2mm inductors while maintaining stable regulation across load transients from 1mA to 350mA peak.
It integrates undervoltage lockout (1.8V threshold), active-low shutdown with 0.3V/1.1V logic thresholds, and feedback pin bias current ≤120nA - enabling precise resistor-divider-based output programming and low-quiescent operation in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 7.0V - supports single Li-Ion (2.7–4.2V) and dual alkaline/NiMH (2.4–3.6V) inputs without external regulation. |
| Output Voltage Range | Adjustable up to 21V - set via external resistor divider on FB pin; enables driving 4-series white LEDs from 3.3V or 20V LCD bias rails. |
| Switch Current Limit | 275–400mA (typ. 350mA) - defines maximum inductor peak current and short-circuit protection level. |
| Feedback Voltage | 1.189V to 1.269V (typ. 1.237V) - determines output accuracy; ±2.3% tolerance over temperature affects VOUT setting precision. |
| Shutdown Current | 0.01µA (max 2.5µA) - enables multi-year battery life in standby mode for handheld devices. |
| Switch RDS(ON) | 0.7Ω (max 1.6Ω) - directly impacts conduction loss and thermal rise at full load; limits usable output power at high VOUT. |
| Off-Time | 400ns (fixed) - sets minimum switching period; constrains maximum duty cycle and dictates inductor size selection. |
Pinout & Package
LM2703MF-ADJ-TI is housed in a 5-lead SOT-23 package (NSC drawing MA05B, top mark S48B) with θJA = 220°C/W and TJ(max) = 150°C.
| 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 & Analog Ground | Single-point tie to PCB ground plane; separates power return from feedback network ground to avoid noise coupling. |
| 3 - FB | Resistor Divider Input | Senses output voltage; bias current ≤120nA allows high-value resistors (e.g., 1MΩ/100kΩ) to minimize divider current. |
| 4 - SHDN | Active-Low Enable Control | Pulled high (>1.1V) to operate; pulled low (<0.3V) to enter 0.01µA shutdown; compatible with GPIO or open-drain logic. |
| 5 - VIN | Input Power Supply | Requires local 4.7µF ceramic bypass capacitor; sensitive to trace inductance - must be placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 235–300µA quiescent current when enabled; enables >1000-hour runtime on coin cells in low-duty-cycle LED flash applications. |
| Integrated 350mA Switch | 0.7Ω RDS(ON) NMOS eliminates external FET and gate driver, reducing BOM count and layout complexity. |
| Fixed 400ns Off-Time | Enables consistent energy transfer per cycle; permits use of 1.0–2.2µH inductors <1.5mm height for ultra-thin designs. |
| Adjustable Output (up to 21V) | FB pin references 1.237V - supports wide VOUT range using standard 1% resistors without trimming or calibration. |
| Input UVLO | 1.8V turn-on threshold prevents erratic startup during battery sag; improves system reliability in deep-discharge conditions. |
Applications
| White LED Backlighting | LCD Bias Supply |
|---|---|
Use Scenario: Driving 4-series white LEDs from a single 3.6V Li-Ion cell in smartphones or PDAs. IC Role / Device Role / Timing Role: Step-up converter providing regulated 16–20V output with current-mode control to maintain uniform LED brightness. Use Value: Achieves >80% efficiency at 20mA per LED while consuming only 0.01µA in display-off state. |
Use Scenario: Generating +15V and –10V bias rails for TFT-LCD source/gate drivers in portable displays. IC Role / Device Role / Timing Role: Primary positive rail generator; paired with inverting charge pump for negative rail. Use Value: Supports fast VCOM settling with low output ripple (<20mVPP) due to tight FB tolerance and low-noise layout guidance. |
| Handheld Medical Devices | Digital Camera Flash |
Use Scenario: Powering optical sensors and analog front-ends requiring stable 5V or 12V from AA batteries. IC Role / Device Role / Timing Role: Primary DC/DC stage converting 1.8–3.0V battery stack to fixed system rail. Use Value: Delivers 100mA at 92% efficiency while maintaining shutdown current <2.5µA for multi-week standby. |
Use Scenario: Charging high-voltage xenon flash capacitor (300V) via intermediate 20V rail in compact digital cameras. IC Role / Device Role / Timing Role: High-efficiency boost stage feeding charge pump multiplier; operates in burst mode during charging. Use Value: Enables full capacitor charge in <2s using 2.2µH inductor and 10µF ceramic output cap - validated in TI reference design SLVA222. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRVR | Higher 28V switch rating, 0.55Ω RDS(ON), 500kHz fixed frequency vs. LM2703MF-ADJ-TI's variable-frequency constant off-time. | Better suited for higher-output-power LED strings (>500mA) but requires larger inductors due to lower switching frequency. | Select TPS61040DRVR when output current exceeds 300mA or when fixed-frequency EMI filtering is required. |
| MAX682ESA+ | Lower 2.5V min input, 200mA switch limit, no shutdown pin; uses external MOSFET - higher BOM cost and layout complexity. | Targeted at ultra-low-voltage coin-cell applications (1.8–2.5V), not suitable for Li-Ion or multi-LED loads. | Choose MAX682ESA+ only for sub-2V input systems where LM2703MF-ADJ-TI cannot start. |
Compared with TPS61040DRVR and MAX682ESA+, the LM2703MF-ADJ-TI offers optimal balance of low shutdown current (0.01µA), integrated 350mA switch, and 400ns off-time for miniaturized inductor selection - making it preferred for single-cell Li-Ion LED and LCD bias where footprint and standby power are critical.
Availability
LM2703MF-ADJ-TI is available at Aetrix Electronics and suitable for white LED backlighting, LCD bias supplies, and handheld medical devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2703MF-ADJ-TI 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 acquired National Semiconductor in 2011 and maintains its legacy analog portfolio with full datasheet, simulation model, and application note support.
The LM2703MF-ADJ-TI belongs to TI's micropower DC/DC converter product line, designed specifically for battery-operated portable electronics needing high efficiency at light loads and minimal board area.
FAQ
What is the minimum input voltage required for LM2703MF-ADJ-TI to start switching?
The LM2703MF-ADJ-TI incorporates input undervoltage lockout (UVLO) with a turn-on threshold of 1.8V. It will not initiate switching until VIN rises above this level. Once operational, it sustains regulation down to 2.2V per the specified input range - ensuring reliable startup from partially discharged Li-Ion cells or alkaline batteries.
Can LM2703MF-ADJ-TI drive more than four white LEDs in series?
No - the LM2703MF-ADJ-TI's 22V switch rating and typical 21V max output limit constrain it to four standard white LEDs (3.0–3.6V each). Attempting five LEDs would exceed safe operating voltage margin and risk switch breakdown. For higher LED counts, TI recommends the TPS61165 or similar 36V-rated boost controllers.
How does the 400ns off-time affect inductor selection for LM2703MF-ADJ-TI?
The fixed 400ns off-time directly determines minimum inductor value: LMIN ≈ (VIN(MIN) × TOFF) / ICL. At 2.2V input and 350mA limit, this yields ~2.5µH - but TI application notes recommend 1.0–2.2µH for optimal transient response and size. Smaller inductors increase peak current and ripple; larger ones reduce efficiency at light loads.
Is LM2703MF-ADJ-TI RoHS compliant and lead-free?
Yes - LM2703MF-ADJ-TI is RoHS compliant and lead-free per TI's published environmental compliance documentation. The SOT-23-5 package (MA05B) uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), allowing standard reflow profiles without baking.
What is the recommended feedback resistor configuration for a 12V output using LM2703MF-ADJ-TI?
Using the formula VOUT = VFB × (1 + R1/R2) with VFB = 1.237V, a 12V output requires R1/R2 ≈ 8.69. TI recommends R2 = 100kΩ and R1 = 866kΩ (1% metal film), yielding 11.98V. Place both resistors within 2mm of the FB pin and tie the R2 ground to the GND pin directly - not to a noisy digital ground plane.
LM2703MF-ADJ-TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Topology:
- -
- Internal Switch(s):
- -
- Number of Outputs:
- -
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- -
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
LM2703MF-ADJ-TI FAQ
1.How can I place an order for LM2703MF-ADJ-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2703MF-ADJ-TI 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-TI reliable?
The price and inventory of LM2703MF-ADJ-TI 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-TI is usually 5 days.
3.What payment methods are accepted for LM2703MF-ADJ-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2703MF-ADJ-TI transactions.
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4.How is shipping managed for LM2703MF-ADJ-TI?
LM2703MF-ADJ-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2703MF-ADJ-TI 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-TI?
For technical support, including LM2703MF-ADJ-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2703MF-ADJ-TI requirements.
6.How does Aetrix verify that LM2703MF-ADJ-TI is sourced from the original manufacturer or authorized distributors?
All LM2703MF-ADJ-TI 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-TI meets industry standards.
7.What is the process for return or replacement of LM2703MF-ADJ-TI?
All LM2703MF-ADJ-TI units undergo pre-shipment inspection (PSI). If there is an issue with LM2703MF-ADJ-TI, 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-TI part is unused and in its original packaging.
Return procedure for LM2703MF-ADJ-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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