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Texas Instruments LM2703MF-ADJ
- Part No.:
- LM2703MF-ADJ
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2703MF-ADJ.pdf
- Description:
- IC LED DRVR RGLTR 350MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,366
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Product details
Overview
LM2703MF-ADJ 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 datasheet, LM2703MF-ADJ pinout, LM2703MF-ADJ application, or LM2703MF-ADJ 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 (e.g., Coilcraft DT1608C-103).
Technical Context
The LM2703MF-ADJ uses constant off-time (COT) control with internal 1.237V feedback reference and current-limit sensing to regulate output voltage. Its 400ns off-time enables use of small inductors while maintaining stability across load and input variations.
Operation relies on NMOS switch turn-on until peak inductor current reaches 350mA, followed by fixed 400ns off period and energy transfer via external Schottky diode. Shutdown logic disables switching and reduces quiescent current to 0.01µA when SHDN < 0.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Adjustable up to 21V via external resistor divider; set by 1.237V FB reference. |
| Input Voltage Range | 2.2V to 7.0V; supports single Li-Ion (2.5–4.2V) and 3.3V/5V rail inputs. |
| Switch Current Limit | 350mA typical; limits peak inductor current to prevent saturation and thermal overload. |
| RDS(ON) | 0.7Ω typical; minimizes conduction loss during switch-on phase. |
| Shutdown Current | 0.01µA max; enables ultra-low power state for battery longevity in portable devices. |
| Feedback Reference | 1.237V ±32mV; defines output regulation point and sets accuracy of adjustable output. |
| Thermal Resistance θJA | 220°C/W; determines maximum allowable power dissipation at ambient temperature. |
Pinout & Package
LM2703MF-ADJ is housed in a 5-pin SOT-23 (DBV) package with 1.45mm max height, RoHS-compliant Sn lead finish, and moisture sensitivity level 1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch drain node | Connects to inductor and Schottky diode anode; high dv/dt node requiring minimal trace area to reduce EMI. |
| GND (Pin 2) | Power and analog ground | Single-point tie to PCB ground plane; critical for noise immunity and feedback stability. |
| FB (Pin 3) | Feedback input | Senses output voltage via resistor divider; 30–120nA bias current affects divider design choice. |
| SHDN (Pin 4) | Active-low enable control | Drives device into 0.01µA shutdown when < 0.3V; enables >1.1V for normal operation. |
| VIN (Pin 5) | Input supply | Accepts 2.2–7V input; requires local 4.7µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | Up to 21V using external resistive divider; enables flexible biasing for diverse display and LED configurations. |
| Micropower Operation | 235µA typical operating current and 0.01µA shutdown current extend battery life in portable systems. |
| Integrated 350mA Switch | Eliminates need for external MOSFET; reduces BOM count and layout complexity in space-constrained designs. |
| Fixed 400ns Off-Time | Enables use of low-profile, low-inductance coils (e.g., 10µH) and improves transient response in compact layouts. |
| Input UVLO Protection | 1.8V turn-on threshold prevents erratic startup during battery discharge and ensures clean system reset. |
Applications
| LCD Bias Supply | White LED Backlighting |
|---|---|
|
Use Scenario: Generating 12–20V bias for TFT-LCD gate drivers from 3.3V or Li-Ion source. IC Role / Device Role / Timing Role: Step-up regulator providing stable high-voltage rail with low ripple and fast load transient recovery. Use Value: Enables compact, low-noise bias generation without transformer-based solutions; supports 12V @ 22mA as shown in Figure 19. |
Use Scenario: Driving 2–4 series white LEDs (3.0–3.6V each) from 2.5–4.2V Li-Ion battery. IC Role / Device Role / Timing Role: Constant-current-capable boost controller regulating LED string voltage via feedback loop. Use Value: Delivers 20V @ 15mA output (Figure 17); efficiency exceeds 85% at 4.2V input, extending display runtime. |
| Handheld Device Power | Digital Camera Flash Support |
|
Use Scenario: Providing auxiliary 5V or 12V rail for sensors, memory, or interface ICs in PDAs and barcode scanners. IC Role / Device Role / Timing Role: Micropower boost converter enabling always-on functionality with minimal standby drain. Use Value: 40µA disabled current and 0.01µA shutdown allow multi-week shelf life; supports VIN down to 2.2V during deep discharge. |
Use Scenario: Charging LED flash capacitor (e.g., 100µF) to 12–15V in compact digital cameras. IC Role / Device Role / Timing Role: High-efficiency charge pump alternative delivering regulated boost voltage with controlled inrush. Use Value: Achieves 70–75% efficiency at 12V/70mA (Figure 20); 350mA current limit safely handles capacitor charging surges. |
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 |
|---|---|---|---|
| TPS61022 | Higher 2A switch current, 3.3V–5.5V input, integrated diode, 2.5MHz switching frequency. | Targets higher-power LED drivers and USB-powered accessories; not suitable for ultra-low-IQ battery-only use. | Choose TPS61022 when >100mA output current or integrated diode simplification is required. |
| MAX1706 | 2.5V–5.5V input, 1.25V FB reference, 1.2MHz fixed frequency, no shutdown pin, 100µA IQ. | Designed for older handheld platforms; lacks UVLO and ultra-low shutdown current. | Choose MAX1706 only for legacy redesign where footprint compatibility and fixed-frequency EMI control are prioritized. |
Compared with LM2703MF-ADJ, TPS61022 offers higher output capability but consumes more quiescent current, while MAX1706 provides simpler control but sacrifices battery efficiency and protection features - making LM2703MF-ADJ optimal for micropower, Li-Ion–fed LCD/LED applications demanding long runtime and small size.
Availability
LM2703MF-ADJ is available at Aetrix Electronics and suitable for LCD bias supplies, white LED backlighting, and handheld device power management requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for LM2703MF-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-efficiency DC/DC conversion.
The LM2703MF-ADJ belongs to TI's micropower boost converter product line, designed specifically for space- and battery-constrained portable electronics requiring high-voltage, low-current outputs from single-cell sources.
FAQ
What is the maximum output voltage achievable with LM2703MF-ADJ?
The LM2703MF-ADJ supports adjustable output voltage up to 21V, limited by its 22V-rated internal switch and external resistor divider configuration. The feedback reference is 1.237V, so VOUT = 1.237V × (1 + R1/R2). For example, R1 = 510kΩ and R2 = 33kΩ yields ~20V. Exceeding 21V risks violating absolute maximum SW voltage rating of 22.5V.
How does the LM2703MF-ADJ achieve high efficiency at light loads?
The LM2703MF-ADJ achieves high light-load efficiency through micropower design: 235µA typical operating current and automatic pulse-skipping mode that disables switching when FB reaches 1.237V, reducing quiescent draw to 40µA. This behavior, combined with low RDS(ON) (0.7Ω) and fixed 400ns off-time, maintains >80% efficiency even at 1mA load with 3.3V input.
Can LM2703MF-ADJ drive multiple white LEDs in series?
Yes, the LM2703MF-ADJ can drive up to four standard white LEDs (3.0–3.6V forward voltage each) in series from a single Li-Ion cell (2.5–4.2V), delivering up to 20V output. As confirmed in the datasheet Applications section and Figure 17, it sustains 15mA at 20V with >85% efficiency at 4.2V input - sufficient for typical mobile backlighting requirements.
What is the recommended inductor for LM2703MF-ADJ in a 20V output, 15mA application?
For a 20V output, 15mA load from 3.3V input, TI recommends a 10µH low-profile inductor such as Coilcraft DT1608C-103 or Murata LQY33PN100M02. These parts meet the saturation current requirement (>350mA peak), low DCR (<0.3Ω), and physical height constraints (<1.2mm) specified in the Layout Considerations section and Figure 17.
Does LM2703MF-ADJ include input undervoltage lockout, and what is its threshold?
Yes, LM2703MF-ADJ includes input undervoltage lockout (UVLO) with a nominal 1.8V turn-on threshold and hysteresis to prevent oscillation near cutoff. When VIN drops below ~1.8V, the device disables switching and enters low-current state; it resumes operation only after VIN rises above the threshold plus hysteresis (~8mV), ensuring robust startup from deeply discharged batteries.
LM2703MF-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
LM2703MF-ADJ FAQ
1.How can I place an order for LM2703MF-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2703MF-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 LM2703MF-ADJ reliable?
The price and inventory of LM2703MF-ADJ 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 is usually 5 days.
3.What payment methods are accepted for LM2703MF-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2703MF-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2703MF-ADJ?
LM2703MF-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2703MF-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 LM2703MF-ADJ?
For technical support, including LM2703MF-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2703MF-ADJ requirements.
6.How does Aetrix verify that LM2703MF-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2703MF-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 LM2703MF-ADJ meets industry standards.
7.What is the process for return or replacement of LM2703MF-ADJ?
All LM2703MF-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2703MF-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 LM2703MF-ADJ part is unused and in its original packaging.
Return procedure for LM2703MF-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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