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Texas Instruments LM2704MF-ADJ/NOPB
- Part No.:
- LM2704MF-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2704MF-ADJ/NOPB.pdf
- Description:
- IC LED DRVR RGLTR 550MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,118
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Product details
Overview
LM2704MF-ADJ/NOPB from Texas Instruments is a micropower step-up DC/DC converter with an integrated 550mA peak-current-limited NMOS switch, adjustable output voltage up to 20V, 2.2V–7V input range, and 0.01µA shutdown current. It operates in a 5-lead SOT-23 package and is used in space-constrained white LED backlighting and LCD bias supplies powered by single Li-Ion batteries.
For engineers reviewing the LM2704MF-ADJ/NOPB datasheet, LM2704MF-ADJ/NOPB pinout, LM2704MF-ADJ/NOPB application, or LM2704MF-ADJ/NOPB equivalent, key selection criteria include feedback-set output adjustability, 400ns fixed off-time control for low-profile inductor compatibility, 0.7Ω switch RDS(ON), input undervoltage lockout at 1.8V, and thermal performance with θJA = 220°C/W.
Technical Context
The LM2704MF-ADJ/NOPB uses a constant off-time (COT) control architecture with internal bandgap reference and enable comparator. Output regulation is achieved via FB pin feedback with 1.237V trip point and 8mV hysteresis, enabling stable operation across load transients without external compensation.
Its 550mA current-limited NMOS switch features 0.7Ω typical RDS(ON) and supports up to 20.5V SW node voltage. Shutdown is active-low on SHDN pin (thresholds: 0.3V low, 1.1V high), reducing quiescent current to 0.01µA while maintaining diode-drop output decay behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Adjustable up to 20V via external resistor divider on FB pin - enables flexible bias generation for LCD panels and multi-LED strings. |
| Input Voltage Range | 2.2V to 7.0V - supports direct operation from single-cell Li-Ion (2.7–4.2V), NiMH, or alkaline sources without pre-regulation. |
| Switch Current Limit | 490–610mA (typ. 550mA) - sets maximum inductor peak current and defines power delivery capability under short-circuit or startup conditions. |
| Quiescent Current | 235–300µA (enabled), 0.01µA (shutdown) - ensures ultra-low standby power for battery longevity in portable devices. |
| Switch RDS(ON) | 0.7Ω (typ.), 1.6Ω (max) - minimizes conduction loss and improves efficiency at light-to-moderate loads. |
| Off-Time | 400ns (fixed) - enables use of sub-2.2mm height inductors and reduces minimum required inductance for compact layouts. |
| Feedback Reference | 1.189–1.269V (typ. 1.237V) - defines output accuracy and stability margin; hysteresis of 8mV prevents oscillation near regulation threshold. |
Pinout & Package
LM2704MF-ADJ/NOPB is housed in a RoHS-compliant, green, 5-lead SOT-23 (DBV) package with 1.45mm max height, JEDEC MO-178 compliant footprint, and Q3 pin 1 quadrant orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch Drain Node | Connects to inductor and Schottky diode anode; high dv/dt node requiring minimized trace area to reduce EMI. |
| 2 - GND | Power & Analog Ground | Single ground connection point; must tie directly to PCB ground plane to ensure stable reference and minimize noise coupling. |
| 3 - FB | Feedback Input | Senses output voltage via resistor divider; 30–120nA bias current requires low-impedance network and AGND tie to GND pin. |
| 4 - SHDN | Shutdown Control | Active-low logic input; <0.3V disables device (0.01µA IQ), >1.1V enables operation; internal pull-down not provided. |
| 5 - VIN | Input Supply | Accepts 2.2–7V input; requires local 4.7µF ceramic bypass capacitor placed adjacent to pin to suppress input ripple and ESR-related losses. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 235–300µA operating IQ and 0.01µA shutdown current extend battery life in always-on or intermittent-use portable systems. |
| Adjustable Output | FB pin enables precise output setting from ~2.5V to 20V using standard resistor values - eliminates need for multiple fixed-output variants. |
| Integrated Power Switch | 550mA current-limited, 0.7Ω NMOS switch reduces BOM count and layout complexity versus external-FET boost controllers. |
| Fixed 400ns Off-Time | Enables consistent switching frequency scaling with input/output ratio; supports tiny inductors (e.g., 1–4.7µH, 2.2mm × 1.4mm) for ultra-thin designs. |
| Input UVLO | 1.8V undervoltage lockout prevents erratic startup and protects battery from deep discharge during weak-cell conditions. |
Applications
| White LED Backlighting | LCD Bias Supply |
|---|---|
Use Scenario: Driving 6–8 white LEDs in series from a 3.0–3.7V Li-Ion battery in smartphones or PDAs. IC Role / Device Role / Timing Role: Step-up DC/DC converter providing regulated 15–20V output with current-mode control to maintain uniform LED brightness. Use Value: Delivers >80% efficiency at 15mA load while consuming only 235µA quiescent current - maximizes display runtime per charge cycle. |
Use Scenario: Generating dual ±10V or +15V/–5V bias rails for TFT-LCD source/gate drivers in handheld instrumentation. IC Role / Device Role / Timing Role: Primary positive high-voltage rail generator; paired with inverting charge pump for negative rail. Use Value: Adjustable output allows precise matching to panel VCOM, VGH, and VGL requirements without custom IC variants. |
| Handheld Digital Cameras | Portable Medical Sensors |
Use Scenario: Powering CCD/CMOS image sensor bias and flash LED circuits in compact digital cameras with 2xAA or Li-Poly inputs. IC Role / Device Role / Timing Role: High-efficiency boost converter supplying 5V or 12V from 3V input; synchronized with shutter timing for transient load handling. Use Value: 400ns off-time and 550mA switch support fast dynamic response to flash pulse demands without output droop. |
Use Scenario: Providing stable 12V bias for analog front-end op-amps and ADC reference buffers in battery-powered glucose meters or pulse oximeters. IC Role / Device Role / Timing Role: Low-noise, low-quiescent boost stage preceding LDO post-regulation to meet strict analog supply rejection specs. Use Value: 0.01µA shutdown current preserves battery during sleep mode; FB pin filtering minimizes switching noise injection into sensitive analog paths. |
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, 400mA limit, 2.5–6V input, 2.5µA shutdown current - lacks UVLO hysteresis and has higher operating IQ (500µA). | Better suited for 24V output designs but less optimal for ultra-low-power Li-Ion LED apps due to higher IQ. | Select when higher output voltage headroom or tighter input regulation is required; verify FB network compatibility. |
| MAX680ESA+ | Charge-pump topology (not inductive), fixed 5V/±5V outputs, no adjustable FB, 120µA IQ, 100mA output - limited to low-current, low-voltage dual-rail needs. | Only viable for sub-100mA, non-adjustable, dual-rail applications where inductor-free design is mandatory. | Choose only if inductor elimination outweighs efficiency and voltage flexibility trade-offs; not suitable for LED driving or >12V outputs. |
Compared with TPS61040DRVR and MAX680ESA+, the LM2704MF-ADJ/NOPB offers superior micropower operation (0.01µA shutdown), precise FB-based adjustability, and optimized 550mA/0.7Ω switch for medium-current LED and LCD bias - making it the preferred choice for space- and battery-constrained 2.2–7V input systems requiring up to 20V output.
Availability
LM2704MF-ADJ/NOPB is available at Aetrix Electronics and suitable for white LED backlighting, LCD bias supplies, handheld digital cameras, and portable medical sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2704MF-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 power management innovation and industrial-grade reliability.
The LM2704MF-ADJ/NOPB belongs to TI's micropower DC/DC converter product line, designed specifically for ultra-low-quiescent, small-footprint boost applications in battery-powered portable electronics where efficiency, size, and standby power are critical.
FAQ
What is the maximum output voltage achievable with the LM2704MF-ADJ/NOPB?
The LM2704MF-ADJ/NOPB supports adjustable output voltages up to 20V, as confirmed by its 21V-rated internal switch and absolute maximum SW voltage rating of 21V. This is achieved using an external resistor divider on the FB pin, with the feedback reference voltage fixed at 1.237V (typical). The actual maximum usable output depends on input voltage, load, and component selection - for example, generating 20V from a 3.0V input requires careful inductor and diode selection to maintain stability and efficiency. The LM2704MF-ADJ/NOPB datasheet specifies 20.5V as the maximum SW node voltage under operating conditions.
How does the LM2704MF-ADJ/NOPB achieve high efficiency at light loads?
The LM2704MF-ADJ/NOPB achieves high light-load efficiency through its micropower design: it draws only 235–300µA quiescent current when enabled and drops to just 0.01µA in shutdown. Its constant off-time control scheme reduces switching losses at low duty cycles, and the 0.7Ω (typ.) RDS(ON) of the internal NMOS switch minimizes conduction loss. Additionally, the device enters burst-mode-like operation when the FB pin reaches regulation - disabling the switch and reducing IQ to ~40µA until output droop triggers reactivation. This behavior is intrinsic to the LM2704MF-ADJ/NOPB's enable comparator and bandgap reference architecture.
Can the LM2704MF-ADJ/NOPB drive 8 white LEDs in series from a single Li-Ion cell?
Yes, the LM2704MF-ADJ/NOPB is explicitly rated for driving up to 8 white LEDs in series from a single Li-Ion battery (2.7–4.2V), as stated in its official applications list and typical circuit examples. With a typical forward voltage of ~3.2V per LED, 8 LEDs require ~25.6V - however, the LM2704MF-ADJ/NOPB's 20V maximum output means this assumes lower-VF LEDs (e.g., ~2.5V) or partial-string configurations. TI's application note confirms reliable operation at 15–20V output with 15–20mA LED current, achieving >80% efficiency. The LM2704MF-ADJ/NOPB's 550mA peak switch current and 400ns off-time ensure sufficient energy transfer for stable LED current regulation.
What is the purpose of the SHDN pin on the LM2704MF-ADJ/NOPB, and what voltage levels activate it?
The SHDN pin on the LM2704MF-ADJ/NOPB is an active-low shutdown control input that reduces quiescent current to 0.01µA when asserted. It activates shutdown when pulled below 0.3V (max) and enables normal operation when held above 1.1V (min); voltages between 0.3V and 1.1V result in undefined behavior. No internal pull-up or pull-down is provided, so an external logic signal or resistor divider must drive the pin decisively. During shutdown, the output decays to approximately VIN minus one Schottky diode drop. This functionality is fully characterized in the LM2704MF-ADJ/NOPB Electrical Characteristics table under "SHDN Threshold" parameters.
Is the LM2704MF-ADJ/NOPB compatible with ceramic output capacitors, and what value is recommended?
Yes, the LM2704MF-ADJ/NOPB is fully compatible with multilayer ceramic capacitors (MLCCs) on the output, and TI explicitly recommends them for minimizing output voltage ripple due to their low ESR. A 1µF ceramic capacitor is sufficient for most applications, though increasing capacitance (e.g., to 2.2–4.7µF) further reduces ripple - especially under dynamic load conditions. The LM2704MF-ADJ/NOPB's control loop is stable with ceramic output caps and does not require ESR-based damping. Layout best practices specify placing COUT as close as possible to the SW and GND pins to minimize parasitic inductance, a requirement confirmed in the LM2704MF-ADJ/NOPB layout guidelines.
LM2704MF-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:
- 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/NOPB FAQ
1.How can I place an order for LM2704MF-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2704MF-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 LM2704MF-ADJ/NOPB reliable?
The price and inventory of LM2704MF-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 LM2704MF-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2704MF-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2704MF-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2704MF-ADJ/NOPB?
LM2704MF-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2704MF-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 LM2704MF-ADJ/NOPB?
For technical support, including LM2704MF-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2704MF-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2704MF-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2704MF-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 LM2704MF-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2704MF-ADJ/NOPB?
All LM2704MF-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2704MF-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 LM2704MF-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2704MF-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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