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Texas Instruments LM2703MFX-ADJ
- Part No.:
- LM2703MFX-ADJ
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2703MFX-ADJ.pdf
- Description:
- IC LED DRVR RGLTR 350MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,660
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Product details
Overview
LM2703MFX-ADJ from Texas Instruments is a micropower step-up DC/DC converter with an internal 350mA peak-current-limited NMOS switch, 0.7Ω RDS(ON), and adjustable output voltage up to 21V. It operates from 2.2V to 7V input (e.g., single Li-Ion), delivers up to 15mA load current, and targets space-constrained portable applications including white LED backlighting and LCD bias supplies.
For engineers reviewing the LM2703MFX-ADJ datasheet, LM2703MFX-ADJ pinout, LM2703MFX-ADJ application, or LM2703MFX-ADJ equivalent, key selection criteria include its 400ns fixed off-time control architecture, 1.237V feedback reference accuracy, 0.01µA shutdown current, SOT-23-5 thermal performance (θJA = 220°C/W), and compatibility with low-profile inductors such as Coilcraft DT1608C-103.
Technical Context
The LM2703MFX-ADJ uses a constant off-time, current-limited switching topology with internal NMOS switch and bandgap-referenced feedback comparator. Its 400ns off-time enables use of small inductors and ceramic capacitors while maintaining regulation across 2.2V–7V input range.
Operation relies on FB pin sensing via external resistor divider (R1/R2) to set VOUT = 1.237V × (1 + R1/R2); shutdown is active-low at SHDN pin with 0.3V threshold. The 22V-rated SW pin supports outputs up to 21V with Schottky diode and external passive components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 7.0V - supports single-cell Li-Ion (2.5V–4.2V) and 3.3V/5V rails without external LDO pre-regulation. |
| Output Voltage Range | Adjustable up to 21V - set by external R1/R2 divider; enables LCD bias and multi-LED string drive from low-voltage sources. |
| Switch Current Limit | 275–400mA (typ. 350mA) - defines maximum inductor peak current and constrains power delivery for 15mA output loads. |
| RDS(ON) | 0.7Ω (typ.) - reduces conduction loss in internal NMOS switch, improving efficiency at light-to-moderate loads. |
| Feedback Reference | 1.189V–1.269V (typ. 1.237V) - high-accuracy bandgap reference enabling ±4% output regulation over temperature and line. |
| Shutdown Current | 0.01µA (max) - enables ultra-low-power battery preservation during system sleep modes. |
| Off-Time | 400ns (fixed) - determines minimum switching period and enables use of sub-10µH inductors like DT1608C-103. |
Pinout & Package
LM2703MFX-ADJ is housed in a 5-pin SOT-23 (DBV) package with 1.45mm max height, JEDEC MO-178 compliant, and RoHS-compliant matte tin lead finish. Thermal resistance θJA = 220°C/W; maximum junction temperature = 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Internal NMOS drain node | Connects to inductor and Schottky diode anode; high dv/dt node requiring minimal trace area to limit EMI. |
| GND (Pin 2) | Power and analog ground reference | Must tie directly to PCB ground plane; serves as return for switch current and feedback network reference. |
| FB (Pin 3) | Resistive divider feedback input | Senses output voltage; sets regulation point at 1.237V - requires low-noise layout with AGND tie to Pin 2. |
| SHDN (Pin 4) | Active-low enable control | Pull below 0.3V to disable (IQ = 0.01µA); pull above 1.1V to enable; no external pull-up required in most designs. |
| VIN (Pin 5) | Input power supply | Accepts 2.2V–7V; must be bypassed with ≥4.7µF ceramic capacitor placed adjacent to pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 235–300µA quiescent current when enabled - extends battery life in always-on portable devices. |
| Adjustable output voltage | Configurable from ~2.5V to 21V using two external resistors - eliminates need for multiple fixed-output variants. |
| Low shutdown current | 0.01µA shutdown leakage - preserves battery charge for months in storage or deep-sleep states. |
| Input undervoltage lockout (UVLO) | 1.8V turn-on threshold - prevents erratic startup during battery brownout or weak input conditions. |
| Small footprint integration | 5-pin SOT-23 package with support for 10µH low-profile inductors and 1µF/4.7µF ceramic caps - enables <10mm² solution size. |
Applications
| White LED Backlighting | LCD Bias Supply |
|---|---|
|
Use Scenario: Driving 3–4串联 white LEDs from a single Li-Ion cell (2.5V–4.2V) in mobile handsets or PDAs. IC Role / Device Role / Timing Role: Step-up DC/DC controller regulating constant current via external current-sense resistor and feedback loop. Use Value: Delivers stable 20V output at ≤15mA with >85% efficiency at 4.2V input, enabling uniform LED brightness without thermal derating. |
Use Scenario: Generating dual-polarity bias voltages (e.g., +15V and –10V) for TFT-LCD panel gate drivers using discrete charge pumps. IC Role / Device Role / Timing Role: Primary positive high-voltage rail generator; output feeds external inverting charge pump stage. Use Value: Adjustable 12–21V output supports multiple LCD panel architectures; 400ns off-time allows compact 10µH inductor placement near display flex cable. |
| Handheld Device Power Management | Digital Camera Flash Support |
|
Use Scenario: Providing auxiliary 5V or 12V rail for USB peripherals or SD card interface in battery-powered handheld instruments. IC Role / Device Role / Timing Role: Standby-capable boost converter activated only during peripheral enumeration or data transfer bursts. Use Value: 0.01µA shutdown current ensures <1µA system standby draw; fast 50µs start-up time enables responsive peripheral power-up. |
Use Scenario: Charging a 100µF flash capacitor to 300V in compact digital cameras using cascaded boost stages. IC Role / Device Role / Timing Role: First-stage boost converter generating intermediate 12V rail feeding subsequent flyback or charge-pump multiplier. Use Value: 350mA peak switch current and 22V SW rating support efficient 12V generation at 2.5V input; UVLO prevents misfire during low-battery conditions. |
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, integrated diode, 2.5MHz switching frequency | Better suited for >50mA loads and higher-frequency layouts; requires different inductor/capacitor values | Select when higher output current or smaller passive components are needed; not drop-in due to different pinout and control scheme. |
| MAX17222ETA+ | 1.8V–5.5V input, 0.5A switch, 1.2MHz, integrated FET and diode, 0.9V feedback reference | Optimized for ultra-low-input applications (e.g., coin cells); lower max output voltage (28V) but tighter light-load efficiency | Prefer for sub-2V inputs or where integrated diode simplifies BOM; FB reference mismatch requires resistor recalculations for same VOUT. |
Compared with TPS61022DRVR and MAX17222ETA+, the LM2703MFX-ADJ offers superior micropower operation (0.01µA shutdown) and simpler external component requirements for ≤15mA loads, making it optimal for cost-sensitive, battery-critical portable systems where ultra-low IQ outweighs raw current capability.
Availability
LM2703MFX-ADJ is available at Aetrix Electronics and suitable for white LED backlighting, LCD bias supplies, and handheld device auxiliary power requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOT-23 packaging.
Supply support for LM2703MFX-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 ICs, with decades of expertise in high-efficiency DC/DC conversion and portable power solutions.
The LM2703 product line was designed specifically for ultra-low-power, space-constrained boost applications in consumer portables - emphasizing micropower operation, minimal external components, and robust Li-Ion battery compatibility.
FAQ
What is the maximum output voltage achievable with LM2703MFX-ADJ?
The LM2703MFX-ADJ supports output voltages up to 21V, limited by its 22V-rated internal switch and external component selection. This is achieved using the feedback equation VOUT = 1.237V × (1 + R1/R2); for example, R1 = 510kΩ and R2 = 33kΩ yields ~20V. Exceeding 21V risks SW pin overstress and is outside guaranteed operating conditions.
Can LM2703MFX-ADJ operate from a single alkaline cell?
No - the LM2703MFX-ADJ requires a minimum 2.2V input, while a fresh alkaline cell starts at ~1.6V and drops rapidly under load. It is optimized for single Li-Ion (2.5V–4.2V), NiMH (2.4V–3.0V), or regulated 3.3V/5V rails. For alkaline operation, consider TI's TPS61200 or similar sub-2V-startup boost converters.
What inductor value is recommended for a 20V output from 3.3V input using LM2703MFX-ADJ?
For 20V output from 3.3V input, TI recommends a 10µH inductor such as Coilcraft DT1608C-103 or Murata LQY33PN100M02. This value balances peak current (≤350mA), output ripple, and physical size. Equation-based calculation confirms IPK ≈ 320mA at 3.3V min input, validating 10µH as appropriate for stable operation with 400ns off-time.
Does LM2703MFX-ADJ include built-in overvoltage protection?
No - the LM2703MFX-ADJ lacks internal overvoltage protection. Output voltage is regulated solely by the external R1/R2 feedback network and the 1.237V reference. System-level OVP must be implemented externally (e.g., Zener clamp at FB or dedicated supervisor IC) if required for safety-critical applications.
How does the 400ns off-time affect component selection for LM2703MFX-ADJ?
The fixed 400ns off-time dictates minimum inductor discharge time, directly influencing inductor saturation current rating and output capacitor ESR requirements. Shorter off-times demand lower-inductance, higher-current-rated inductors (e.g., 10µH instead of 47µH) and low-ESR ceramics (e.g., Taiyo Yuden 1µF/4.7µF) to maintain regulation and minimize ripple under dynamic load.
LM2703MFX-ADJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LM2703MFX-ADJ FAQ
1.How can I place an order for LM2703MFX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2703MFX-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 LM2703MFX-ADJ reliable?
The price and inventory of LM2703MFX-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2703MFX-ADJ is usually 5 days.
3.What payment methods are accepted for LM2703MFX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2703MFX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2703MFX-ADJ?
LM2703MFX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2703MFX-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 LM2703MFX-ADJ?
For technical support, including LM2703MFX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2703MFX-ADJ requirements.
6.How does Aetrix verify that LM2703MFX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2703MFX-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 LM2703MFX-ADJ meets industry standards.
7.What is the process for return or replacement of LM2703MFX-ADJ?
All LM2703MFX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2703MFX-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 LM2703MFX-ADJ part is unused and in its original packaging.
Return procedure for LM2703MFX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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