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Texas Instruments LM2704MF-ADJ
- Part No.:
- LM2704MF-ADJ
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2704MF-ADJ.pdf
- Description:
- IC LED DRVR RGLTR 550MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,948
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Product details
Overview
LM2704MF-ADJ from Texas Instruments is a micropower step-up DC/DC converter with an internal 550mA peak-current-limited NMOS switch, 0.7Ω RDS(ON), adjustable output up to 20V, and 400ns fixed off-time control. It operates from 2.2V–7V input and delivers high efficiency in space-constrained white LED backlighting and LCD bias applications.
For engineers reviewing the LM2704MF-ADJ datasheet, LM2704MF-ADJ pinout, LM2704MF-ADJ application, or LM2704MF-ADJ equivalent, key selection criteria include its SOT-23-5 package footprint, 0.01µA shutdown current, feedback voltage trip point of 1.237V, input undervoltage lockout at 1.8V, and thermal resistance of 220°C/W-critical for portable battery-powered designs.
Technical Context
The LM2704MF-ADJ uses a constant off-time (COT) control architecture with a bandgap reference and enable comparator to regulate output voltage via external resistor divider on the FB pin. Its 400ns off-time enables use of small inductors while maintaining stability across load transients.
It integrates a 550mA current-limited NMOS power switch with 0.7Ω typical RDS(ON), supports shutdown via active-low SHDN pin (0.3V threshold), and features input undervoltage lockout (UVP) at 1.8V to prevent erratic operation during brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.2V to 7.0V - supports single-cell Li-ion (2.7–4.2V) and alkaline/NiMH battery inputs without external regulation. |
| Output Voltage Range | Adjustable up to 20V - set by external FB resistor divider; enables driving 8-series white LEDs from 3V input. |
| Switch Current Limit | 490–610mA - protects internal NMOS under overload; ensures reliable operation with low-profile inductors. |
| Feedback Voltage | 1.189–1.269V - precise 1.237V nominal trip point enables ±1% output regulation with standard 1% resistors. |
| Shutdown Current | 0.01µA - reduces system standby power significantly; critical for long-life battery applications. |
| Thermal Resistance θJA | 220°C/W - defines maximum power dissipation limit (e.g., 114mW at 25°C ambient); requires careful PCB copper area planning. |
| Switch Off-Time | 400ns - enables high-frequency operation with small inductors (e.g., 1–4.7µH), minimizing board area and cost. |
Pinout & Package
LM2704MF-ADJ is housed in a 5-pin SOT-23 (DBV) package with 1.45mm max height, RoHS-compliant green finish, and JEDEC MO-178 compliant outline. Pin 1 (SW) is located at the top-left corner with index area marking "S28B".
| 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 ground connection point; must tie directly to PCB ground plane to minimize noise coupling into FB path. |
| 3 (FB) | Resistor Divider Input | Senses output voltage; bias current ≤120nA allows high-value resistors (e.g., 1MΩ) to minimize quiescent current. |
| 4 (SHDN) | Active-Low Enable Control | Pull below 0.3V to disable; pull above 1.1V to enable; compatible with GPIOs and logic-level signals. |
| 5 (VIN) | Input Power Supply | Requires local 4.7µF ceramic bypass capacitor placed adjacent to pin to suppress input ripple and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 235–300µA operating IQ enables >100-hour runtime in coin-cell–powered LCD bias supplies. |
| Integrated 550mA Switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout complexity in compact handhelds. |
| Adjustable Output (up to 20V) | Supports wide range of LED strings and LCD VPOS/VNEG rails without redesigning power stage. |
| 400ns Fixed Off-Time | Enables use of 1.0×1.0mm low-profile inductors; cuts solution size by >30% vs. traditional PWM boost converters. |
| 0.01µA Shutdown Mode | Extends shelf life of battery-powered devices; meets stringent energy conservation requirements in IoT sensors. |
Applications
| White LED Backlighting | LCD Bias Supply |
|---|---|
|
Use Scenario: Driving 6–8 white LEDs in series from a single 3.0V Li-ion cell in smartphones or PDAs. IC Role / Device Role / Timing Role: Step-up DC/DC controller regulating constant current through LED string via external current-sense resistor and feedback loop. Use Value: Achieves >85% efficiency at 15mA load while maintaining <±2% output voltage accuracy across battery discharge cycle. |
Use Scenario: Generating +15V and –10V bias rails for TFT-LCD panels in portable medical monitors. IC Role / Device Role / Timing Role: Primary positive rail generator; paired with inverting charge pump for negative rail; COT control ensures fast transient response to display refresh bursts. Use Value: Delivers stable 15V @ 1mA with <10mVpp ripple using only 1µF ceramic output cap-reducing component count vs. LDO-based solutions. |
| Digital Camera Flash Support | Handheld Barcode Scanner Power |
|
Use Scenario: Providing 18V pulse supply for xenon flash capacitor charging in compact digital cameras. IC Role / Device Role / Timing Role: High-voltage boost converter triggered by microcontroller; SHDN pin enables burst-mode operation synchronized with flash timing. Use Value: Charges 100µF capacitor to 18V in <200ms with <5% voltage droop; 0.01µA shutdown prevents battery drain between shots. |
Use Scenario: Powering laser diode driver and CMOS image sensor in battery-operated industrial barcode scanners. IC Role / Device Role / Timing Role: Main 5V system rail generator from 2.4–3.6V primary battery; regulated via FB network with tight tolerance resistors. Use Value: Maintains 5.0V ±3% over full temperature range (−40°C to +85°C) and input voltage swing, ensuring consistent scan accuracy. |
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), 500kHz fixed frequency; no UVP; 2.5µA shutdown current. | Preferred for higher-output-voltage (>18V) or higher-efficiency (>90%) requirements; less suitable for ultra-low-IQ standby. | Select TPS61040DRVR when output voltage exceeds 20V or when fixed-frequency EMI control is required. |
| MAX680ESA+ | Charge-pump topology (no inductor), fixed 5V/−5V dual output, 100mA output current; no adjustable feedback. | Used only for low-current dual-rail generation; cannot replace LM2704MF-ADJ in high-voltage or high-current boost applications. | Choose MAX680ESA+ only for simple dual-rail needs where inductor-free design and lower cost outweigh voltage/flexibility limitations. |
Compared with TPS61040DRVR and MAX680ESA+, the LM2704MF-ADJ uniquely balances ultra-low shutdown current (0.01µA), 20V adjustable output, and SOT-23-5 footprint-making it optimal for space- and battery-life–constrained white LED and LCD bias systems where neither charge-pump simplicity nor higher-voltage fixed-frequency alternatives suffice.
Availability
LM2704MF-ADJ is available at Aetrix Electronics and suitable for white LED backlighting, LCD bias supplies, and handheld device power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2704MF-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 LM2704MF-ADJ belongs to TI's micropower boost converter product line, designed specifically for ultra-low-power, space-constrained portable applications including LCD bias, LED backlighting, and sensor node power rails.
FAQ
What is the maximum output voltage achievable with the LM2704MF-ADJ?
The LM2704MF-ADJ supports an adjustable output voltage up to 20V, limited by its 21V-rated internal switch and absolute maximum SW pin voltage. This is achieved using an external resistor divider on the FB pin, where the nominal feedback voltage is 1.237V. The LM2704MF-ADJ datasheet confirms this limit under Operating Conditions and Absolute Maximum Ratings sections.
Does the LM2704MF-ADJ include input undervoltage lockout (UVP), and what is its threshold?
Yes, the LM2704MF-ADJ includes built-in input undervoltage lockout with an ON/OFF threshold of 1.8V, as specified in the Electrical Characteristics table. This feature prevents erratic switching and output instability when the input voltage drops below the minimum required for proper regulation, ensuring robust operation during battery discharge.
What is the typical quiescent current of the LM2704MF-ADJ in active operation?
The LM2704MF-ADJ draws 235–300µA typical quiescent current when enabled and regulating, measured at TJ = 25°C with FB = 1.2V. This value is confirmed in the Electrical Characteristics table under the IQ parameter. Low IQ enables extended battery life in always-on portable applications such as LCD bias supplies.
Can the LM2704MF-ADJ drive multiple white LEDs in series, and how many?
Yes, the LM2704MF-ADJ can drive up to 8 white LEDs in series from a single Li-ion battery (3.0V nominal), as explicitly stated in the Applications section and Typical Application Circuit (Figure 4). Its 20V output capability and 550mA peak switch current support common forward voltages (~3.0–3.4V per LED) under typical operating conditions.
What package type and pin count does the LM2704MF-ADJ use?
The LM2704MF-ADJ uses a 5-pin SOT-23 (DBV) package, as verified in TI's PACKAGE OPTION ADDENDUM and confirmed by the Connection Diagram and PIN DESCRIPTIONS. The device marking "S28B" appears on the top surface, and the package complies with JEDEC MO-178 standards with 1.45mm max height.
LM2704MF-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:
- 20V
- Current - Output / Channel:
- 550mA (Switch)
- Frequency:
- -
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2704MF-ADJ FAQ
1.How can I place an order for LM2704MF-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2704MF-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 LM2704MF-ADJ reliable?
The price and inventory of LM2704MF-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2704MF-ADJ is usually 5 days.
3.What payment methods are accepted for LM2704MF-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2704MF-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2704MF-ADJ?
LM2704MF-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2704MF-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 LM2704MF-ADJ?
For technical support, including LM2704MF-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2704MF-ADJ requirements.
6.How does Aetrix verify that LM2704MF-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2704MF-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 LM2704MF-ADJ meets industry standards.
7.What is the process for return or replacement of LM2704MF-ADJ?
All LM2704MF-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2704MF-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 LM2704MF-ADJ part is unused and in its original packaging.
Return procedure for LM2704MF-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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