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Texas Instruments LM2704MFX-ADJ/NOPB
- Part No.:
- LM2704MFX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2704MFX-ADJ/NOPB.pdf
- Description:
- IC LED DRVR RGLTR 550MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,327
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Product details
Overview
LM2704MFX-ADJ/NOPB from Texas Instruments is a micropower step-up DC/DC converter with integrated 550mA NMOS switch (RDS(ON) = 0.7Ω), adjustable output voltage up to 20V, and 2.2V–7V input range-designed for space-constrained white LED backlighting and LCD bias supplies in portable devices.
For engineers reviewing the LM2704MFX-ADJ/NOPB datasheet, LM2704MFX-ADJ/NOPB pinout, LM2704MFX-ADJ/NOPB application, or LM2704MFX-ADJ/NOPB equivalent, key selection criteria include its 400ns fixed off-time control, 0.01µA shutdown current, input undervoltage lockout at 1.8V, and SOT-23-5 thermal performance (θJA = 220°C/W).
Technical Context
The LM2704MFX-ADJ/NOPB uses a constant off-time current-mode control architecture with internal bandgap reference and enable comparator feedback loop. It operates by turning on an internal NMOS switch until inductor current reaches the 550mA peak limit, then enforcing a precise 400ns off period before restarting the cycle.
Output voltage is set externally via resistive divider on FB pin with 1.237V trip point and 8mV hysteresis; shutdown is active-low with 0.3V threshold and 1.1V enable level. The device enters ultra-low-power mode (40µA quiescent current) when regulation is met and shuts down fully (0.01µA) when SHDN is asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Step-up (boost) DC/DC converter with integrated NMOS power switch |
| Input Voltage Range | 2.2V to 7.0V - supports single Li-Ion (2.7–4.2V) and multi-cell alkaline/nickel-based batteries |
| Output Voltage Range | Adjustable up to 20V - set via external resistor divider on FB pin with 1.237V reference |
| Switch Current Limit | 550mA typical - defines maximum inductor peak current and load capability under transient conditions |
| Quiescent Current | 235µA typical enabled / 0.01µA in shutdown - enables >100-hour battery life in standby backlight modes |
| Switch RDS(ON) | 0.7Ω typical - reduces conduction loss and improves efficiency at light-to-moderate loads |
| Off-Time | 400ns fixed - enables use of sub-2.2mm height inductors and minimizes footprint in portable designs |
| UVLO Threshold | 1.8V - prevents erratic operation during battery brownout and ensures clean startup |
Pinout & Package
LM2704MFX-ADJ/NOPB is housed in a 5-pin SOT-23 package (DBV drawing, 1.45mm max height), optimized for thermal dissipation (θJA = 220°C/W) and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node | Drain of internal NMOS power switch; connects to inductor and Schottky diode anode - minimize trace area to reduce EMI |
| 2 - GND | Ground reference | Common return for analog and power circuits; must tie directly to ground plane for stable regulation and low noise |
| 3 - FB | Feedback input | Senses output voltage via resistor divider; regulates VOUT = 1.237V × (1 + R1/R2); requires AGND connection near GND pin |
| 4 - SHDN | Shutdown control | Active-low enable: <0.3V disables (0.01µA IQ), >1.1V enables; open-circuit defaults to enabled state |
| 5 - VIN | Power input | Supplies analog and power circuitry; requires local 4.7µF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 235µA typical operating IQ and 0.01µA shutdown current extend battery runtime in always-on display systems |
| Integrated 550mA switch | 0.7Ω RDS(ON) eliminates external MOSFET, reducing BOM count and layout complexity for compact boost designs |
| Adjustable 20V output | External resistor divider on FB pin allows precise tailoring of output for diverse LED string configurations or LCD bias rails |
| Fixed 400ns off-time | Enables consistent switching behavior across input voltage and load variations, simplifying inductor selection and ripple prediction |
| Input UVLO protection | 1.8V turn-on threshold prevents malfunction during battery discharge and ensures reliable cold-start capability |
| SOT-23-5 packaging | Small footprint (2.9mm × 1.6mm) and low profile (1.45mm) support ultra-thin handheld and wearable form factors |
Applications
| White LED Backlighting | LCD Bias Supply |
|---|---|
|
Use Scenario: Driving 6–8 white LEDs in series from a single Li-Ion cell (3.0–4.2V) in smartphone or PDA displays. IC Role / Device Role / Timing Role: Step-up regulator providing regulated 15–20V output with current-mode control to maintain uniform LED brightness. Use Value: 550mA peak switch current and 0.7Ω RDS(ON) deliver >85% efficiency at 15V/15mA, minimizing heat in sealed enclosures. |
Use Scenario: Generating dual-polarity bias voltages (e.g., +15V and –10V) for TFT-LCD gate drivers and source drivers. IC Role / Device Role / Timing Role: Primary positive rail generator; paired with charge pump or inverting converter for negative rail. Use Value: Adjustable 20V output and 2.2V minimum input allow operation down to depleted battery levels while maintaining display contrast. |
| Handheld Device Power | Digital Camera Flash Support |
|
Use Scenario: Providing auxiliary 5V or 12V rail for USB peripherals, sensors, or RF modules in battery-powered handheld instruments. IC Role / Device Role / Timing Role: Standby-capable boost converter activated on demand via SHDN pin to conserve energy between measurements. Use Value: 0.01µA shutdown current and fast start-up (<100µs) enable microamp-level system sleep states without sacrificing responsiveness. |
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 stepping 3.7V battery to ~12V, feeding subsequent flyback or charge-pump stage. Use Value: 400ns off-time and 550mA current limit allow rapid capacitor charging cycles with minimal inductor size (e.g., 4.7µH, 2.5mm × 2.0mm). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost 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 apps | Prefer TPS61040DRVR when >20V output or programmable frequency is required; LM2704MFX-ADJ/NOPB remains optimal for minimal footprint and lowest shutdown current |
| MAX1706ESA+ | 20V switch rating, 1.2V feedback reference, 1.2MHz fixed frequency, no integrated switch - requires external MOSFET | Offers higher switching frequency for smaller magnetics but increases component count and layout sensitivity | Select MAX1706ESA+ only when board space permits external FET and higher-frequency operation justifies added complexity; LM2704MFX-ADJ/NOPB delivers simpler, more integrated solution |
Compared with TPS61040DRVR and MAX1706ESA+, LM2704MFX-ADJ/NOPB provides the smallest PCB footprint (SOT-23-5), lowest shutdown current (0.01µA), and simplest external component count - making it ideal for cost-sensitive, space-constrained, and ultra-low-power portable applications where 20V output suffices.
Availability
LM2704MFX-ADJ/NOPB is available at Aetrix Electronics and suitable for white LED backlighting, LCD bias supplies, handheld device power management, and digital camera auxiliary rails requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for LM2704MFX-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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, power efficiency, and system integration.
The LM2704MFX-ADJ/NOPB belongs to TI's micropower DC/DC converter product line, engineered specifically for battery-powered portable electronics needing high-efficiency, small-footprint, and ultra-low-quiescent-current boost regulation.
FAQ
What is the maximum output voltage achievable with LM2704MFX-ADJ/NOPB?
The LM2704MFX-ADJ/NOPB supports adjustable output voltage up to 20V, determined by the external resistor divider on the FB pin and the internal 1.237V feedback reference. This limit is enforced by the 21V absolute maximum SW pin rating and confirmed in the Electrical Characteristics table under "SW Voltage Max." of 20.5V at operating conditions.
Does LM2704MFX-ADJ/NOPB require an external MOSFET?
No, LM2704MFX-ADJ/NOPB integrates a 550mA NMOS power switch with 0.7Ω typical RDS(ON). The device operates as a complete boost converter with only five external components required: input capacitor, output capacitor, inductor, Schottky diode, and FB resistor divider - eliminating need for external switching transistors.
What is the shutdown current specification for LM2704MFX-ADJ/NOPB?
The LM2704MFX-ADJ/NOPB specifies a shutdown current of 0.01µA (10nA) maximum, measured with SHDN pin held below 0.3V. This ultra-low value enables multi-year battery shelf life in always-connected portable devices and is verified across temperature in the Electrical Characteristics table under "IQ Device Disabled".
How does the 400ns off-time affect inductor selection for LM2704MFX-ADJ/NOPB?
The fixed 400ns off-time in LM2704MFX-ADJ/NOPB dictates minimum inductor discharge time, requiring careful selection to avoid current ramping and excessive ripple. Lower input voltages (e.g., 2.2V) demand larger inductance values per the design equation in the datasheet; typical values range from 4.7µH to 22µH depending on output voltage and load.
Is LM2704MFX-ADJ/NOPB compatible with ceramic output capacitors?
Yes, LM2704MFX-ADJ/NOPB is explicitly designed for low-ESR ceramic output capacitors, with 1µF recommended for most applications. The datasheet emphasizes multilayer ceramic capacitors (MLCCs) to minimize output voltage ripple and improve transient response - and confirms stable operation without external compensation.
LM2704MFX-ADJ/NOPB 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
LM2704MFX-ADJ/NOPB FAQ
1.How can I place an order for LM2704MFX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2704MFX-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 LM2704MFX-ADJ/NOPB reliable?
The price and inventory of LM2704MFX-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 LM2704MFX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2704MFX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2704MFX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2704MFX-ADJ/NOPB?
LM2704MFX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2704MFX-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 LM2704MFX-ADJ/NOPB?
For technical support, including LM2704MFX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2704MFX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2704MFX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2704MFX-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 LM2704MFX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2704MFX-ADJ/NOPB?
All LM2704MFX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2704MFX-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 LM2704MFX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2704MFX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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