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Texas Instruments LM2703MFX-ADJ/NOPB
- Part No.:
- LM2703MFX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2703MFX-ADJ/NOPB.pdf
- Description:
- IC LED DRVR RGLTR 350MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,322
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Product details
Overview
LM2703MFX-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 delivers high efficiency in Li-Ion-powered white LED backlighting and LCD bias supplies using tiny SOT-23-5 footprint.
For engineers reviewing the LM2703MFX-ADJ/NOPB datasheet, LM2703MFX-ADJ/NOPB pinout, LM2703MFX-ADJ/NOPB application, or LM2703MFX-ADJ/NOPB equivalent, key selection criteria include feedback-adjustable output (1.237V reference), 0.7Ω switch RDS(ON), 0.01µA shutdown current, thermal-limited operation at 125°C junction, and compatibility with low-profile inductors like Coilcraft DT1608C-103.
Technical Context
The LM2703MFX-ADJ/NOPB employs constant off-time current-mode control with internal 350mA peak-current limiting and 400ns off-time precision. Its bandgap-based feedback comparator (1.237V ±30mV) enables stable regulation across −40°C to +125°C ambient.
Operation relies on external resistor divider (R1/R2) for output voltage setting, with FB pin bias current ≤120nA ensuring minimal divider loading. Input undervoltage lockout activates below 1.8V, and shutdown logic accepts active-low TTL-compatible control at SHDN pin.
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 7V - supports single-cell Li-Ion (2.5V–4.2V) and 3.3V/5V rails without external LDO pre-regulation. |
| Switch Current Limit | 275–400mA typ - ensures safe energy transfer into inductor while enabling ≥4 white LEDs at 20mA each. |
| Quiescent Current | 235–300µA enabled / 40–70µA disabled - preserves battery life in always-on portable systems. |
| Shutdown Current | 0.01µA max - reduces leakage to negligible levels during system sleep modes. |
| Switch RDS(ON) | 0.7Ω typ - minimizes conduction loss in high-efficiency boost topologies at light-to-moderate loads. |
| Thermal Resistance | θJA = 220°C/W - defines power dissipation limit of ~114mW at 25°C ambient before reaching 125°C TJ(MAX). |
Pinout & Package
LM2703MFX-ADJ/NOPB uses a 5-pin SOT-23 (DBV) package with 1.45mm max height, JEDEC MO-178 compliant, RoHS-compliant matte tin lead finish, and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch drain node | Connects to inductor and Schottky diode anode; requires minimized trace area to reduce EMI and switching losses. |
| 2 (GND) | Power and analog ground | Must tie directly to PCB ground plane; serves as return path for switch current and feedback reference. |
| 3 (FB) | Feedback voltage input | Senses output via resistor divider; 1.237V trip point sets regulation threshold; bias current ≤120nA allows high-value dividers. |
| 4 (SHDN) | Active-low enable control | Pull below 0.3V to disable (0.01µA IQ); pull above 1.1V to enable; compatible with GPIOs and logic-level signals. |
| 5 (VIN) | Input supply input | Accepts 2.2–7V; requires local 4.7µF ceramic bypass capacitor placed adjacent to pin per layout guidelines. |
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 low-profile inductors (e.g., Coilcraft DT1608C-103) and reduces board area in space-constrained handhelds. |
| 0.01µA shutdown current | Extends battery runtime in standby mode - critical for always-on sensors and display controllers in portable devices. |
| Integrated 350mA switch | Eliminates external MOSFET and gate driver; simplifies BOM and improves reliability versus discrete boost solutions. |
| Input UVLO protection | Prevents erratic startup or brownout operation below 1.8V - ensures clean enable/disable behavior during battery discharge. |
Applications
| White LED Back-Lighting | LCD Bias Supply |
|---|---|
Use Scenario: Driving 4串联 white LEDs from a single Li-Ion cell (2.5V–4.2V) in smartphone or PDA displays. IC Role / Device Role / Timing Role: Step-up converter regulating constant-current LED string via external current-sense resistor and feedback loop. Use Value: Achieves >85% efficiency at 20mA per LED with 20V output, leveraging 0.7Ω RDS(ON) and 400ns off-time for minimal inductor size. | Use Scenario: Generating ±10V or +15V bias rails for TFT-LCD source/gate drivers in portable instrumentation. IC Role / Device Role / Timing Role: Primary positive high-voltage rail generator; paired with inverting charge pump or linear regulator for negative rail. Use Value: Supports adjustable 12–20V outputs using standard 510k/33k resistor pairs, enabling one BOM item across multiple panel voltage requirements. |
| Handheld Device Power | Digital Camera Flash Support |
Use Scenario: Boosting 3.3V system rail to 5V for USB peripherals or SD card interfaces in compact IoT edge nodes. IC Role / Device Role / Timing Role: Efficient mid-power DC/DC stage delivering up to 15mA load current with tight output regulation. Use Value: Delivers stable 5V output with <100mV ripple under dynamic load steps, enabled by low 120nA FB bias current and fast 400ns cycle control. | Use Scenario: Charging a 100µF flash capacitor to 200V in ultra-compact digital cameras using cascaded boost stages. IC Role / Device Role / Timing Role: First-stage boost converter stepping 3.3V to 12V, feeding subsequent transformer-based or Dickson multiplier stages. Use Value: Enables reliable start-up down to 2.2V input and maintains regulation during capacitor charging transients due to 350mA current limit and UVLO hysteresis. |
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 |
|---|---|---|---|
| TPS61040DRVR | Higher 28V switch rating, 0.55Ω RDS(ON), 200kHz–1MHz adjustable frequency vs. fixed 400ns off-time. | Supports higher output voltages and wider frequency tuning; less suitable for ultra-low-IQ battery-critical designs. | Choose when >21V output or programmable frequency is required; verify layout for higher-frequency EMI mitigation. |
| MAX1706ESA+ | Fixed 5V output, 2.5V–5.5V input, 300mA switch, 1.22V feedback reference, no SHDN pin. | Lacks adjustability and shutdown control; optimized for cost-sensitive fixed-rail applications only. | Select only for non-adjustable 5V boost where pin count and feature set can be reduced; not drop-in for LM2703MFX-ADJ/NOPB. |
Compared with TPS61040DRVR and MAX1706ESA+, the LM2703MFX-ADJ/NOPB provides superior micropower operation (0.01µA shutdown), precise 1.237V feedback for stable adjustable outputs, and proven compatibility with ultra-low-profile inductors-making it optimal for space- and battery-limited portable displays and sensors.
Availability
LM2703MFX-ADJ/NOPB is available at Aetrix Electronics and suitable for white LED backlighting, LCD bias supplies, handheld device power management, digital camera auxiliary rails, and portable medical sensor interfaces requiring stable component supply and long-term production continuity.
Supply support for LM2703MFX-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 portable power solutions.
The LM2703 product line was designed specifically for ultra-low-power, small-footprint boost conversion in battery-operated displays and lighting, emphasizing micropower operation, minimal external components, and robust thermal performance in SOT-23 packaging.
FAQ
What is the maximum output voltage achievable with LM2703MFX-ADJ/NOPB?
The LM2703MFX-ADJ/NOPB supports output voltages up to 21V, limited by its 22V-rated internal switch and absolute maximum SW pin voltage of 22.5V. Output is set by the external R1/R2 feedback divider using VOUT = 1.237V × (1 + R1/R2). For 20V output, typical values are R1 = 510kΩ and R2 = 33kΩ, as confirmed in TI's SNVS172F datasheet Figure 1.
How does the LM2703MFX-ADJ/NOPB achieve high efficiency at light loads?
The LM2703MFX-ADJ/NOPB achieves high light-load efficiency through its constant off-time architecture and ultra-low quiescent current (235–300µA enabled, 40–70µA disabled). When output voltage reaches regulation, the enable comparator disables the switch, reducing operating current significantly - a key advantage over fixed-frequency converters that maintain switching even at near-zero load.
Can LM2703MFX-ADJ/NOPB drive multiple white LEDs in series?
Yes, the LM2703MFX-ADJ/NOPB can drive up to four white LEDs in series from a single Li-Ion cell (2.5V–4.2V), as explicitly stated in the TI SNVS172F datasheet Applications section. With typical forward voltage of 3.2V per LED, this requires ~12.8V output - well within the device's 21V capability and supported by its 350mA peak switch current limit and low RDS(ON).
What is the recommended inductor for LM2703MFX-ADJ/NOPB in a 20V output, 15mA load application?
TI recommends Coilcraft DT1608C-103 (10µH, 330mA saturation current) or Murata LQY33PN100M02 (10µH, low-profile) for 20V output applications with LM2703MFX-ADJ/NOPB, as specified in the datasheet's Application Information and Layout Considerations sections. These inductors meet the 10µH value derived from the off-time equation and support the required peak current without saturation.
Does LM2703MFX-ADJ/NOPB include input undervoltage lockout, and what is its threshold?
Yes, the LM2703MFX-ADJ/NOPB includes input undervoltage lockout (UVLO) with a turn-on threshold of 1.8V (typical), as specified in the Electrical Characteristics table. This prevents unstable operation during battery discharge and ensures clean startup when VIN rises above the UVLO hysteresis band, improving system reliability in portable Li-Ion applications.
LM2703MFX-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
LM2703MFX-ADJ/NOPB FAQ
1.How can I place an order for LM2703MFX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2703MFX-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 LM2703MFX-ADJ/NOPB reliable?
The price and inventory of LM2703MFX-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 LM2703MFX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2703MFX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2703MFX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2703MFX-ADJ/NOPB?
LM2703MFX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2703MFX-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 LM2703MFX-ADJ/NOPB?
For technical support, including LM2703MFX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2703MFX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2703MFX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2703MFX-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 LM2703MFX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2703MFX-ADJ/NOPB?
All LM2703MFX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2703MFX-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 LM2703MFX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2703MFX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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