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Analog Devices Inc. LTC3490EDD#TRPBF
- Part No.:
- LTC3490EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3490EDD#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR DIM 350MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,737
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Product details
Overview
LTC3490EDD#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous boost LED driver IC designed for single- or dual-cell portable lighting systems. It delivers 350mA constant current with 2.8V–4V output compliance, operates from 1V to 3.2V input, and integrates 100mΩ NMOS and 130mΩ PMOS switches for up to 90% efficiency in flashlight applications.
For engineers reviewing the LTC3490EDD#TRPBF datasheet, LTC3490EDD#TRPBF pinout, LTC3490EDD#TRPBF application, or LTC3490EDD#TRPBF equivalent, key selection criteria include its 1.3MHz fixed-frequency operation, analog dimming via CTRL/SHDN pin, open-LED voltage clamping at 4.7V, undervoltage lockout (0.85V/cell), and low shutdown current (<50µA).
Technical Context
The LTC3490EDD#TRPBF implements a current-mode boost topology with internal compensation, eliminating external loop components. Its feedback path senses LED current through an integrated 0.1Ω sense resistor, and regulation is maintained across input voltages as low as 1V using a dedicated start-up circuit.
It features dual-threshold battery monitoring: LOBAT asserts low when cell voltage drops below 0.8–1.12V (1-cell) or 1.8–2.24V (2-cell), while UVLO disables switching below 0.7–0.9V (1-cell) or 1.4–1.8V (2-cell). The CTRL/SHDN pin provides analog dimming (500 mA/V gain) and logic-controlled shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Drive Current | 350mA ±20mA (DD package, 25°C–85°C); enables stable 1W white LED operation |
| Input Voltage Range | 1V to 3.2V; supports single NiMH/alkaline cell down to end-of-discharge |
| Output Compliance | 2.8V to 4V; matches forward voltage of high-brightness white LEDs |
| Switching Frequency | 1.3MHz (typical); allows use of compact 3.3µH inductor and minimizes EMI |
| Efficiency | Up to 90%; achieved via synchronous rectification with 100mΩ NMOS + 130mΩ PMOS |
| Shutdown Current | <50µA; preserves battery life during storage or standby |
| Open-LED Protection | Clamps output at 4.2–4.7V; prevents damage during LED disconnection or failure |
Pinout & Package
Package: 3mm × 3mm, 0.75mm profile, 8-lead DFN (DD) with exposed thermal pad (Pin 9 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CELLS (Pin 1) | Battery configuration select | Logic low = 1-cell UVLO/LOBAT thresholds; logic high = 2-cell thresholds |
| VIN (Pin 2) | Main power input | Accepts 1V–3.2V from NiMH/alkaline cells; powers internal circuitry |
| SW (Pin 3) | Switch node | Connects to inductor; carries pulsed current from integrated NMOS switch |
| GND (Pin 4) | Power and signal reference | Common return for all currents; ties to exposed pad for thermal conduction |
| LED (Pin 5) | Constant-current output | Sinks regulated 350mA to LED cathode; output compliance up to 4V |
| CAP (Pin 6) | Output filter connection | Connects to 4.7µF low-ESR capacitor; stabilizes output voltage ripple |
| LOBAT (Pin 7) | Open-drain low-battery flag | Asserts low when cell voltage falls below threshold; requires external pull-up |
| CTRL/SHDN (Pin 8) | Analog dimming & shutdown control | Voltage between 0.2×VIN and 0.9×VIN linearly scales ILED; <0.2×VIN enables shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous FETs | 100mΩ NMOS + 130mΩ PMOS reduce conduction loss and eliminate external diode |
| Single-supply analog dimming | 500 mA/V gain referenced to VIN enables battery-independent brightness control |
| Programmable battery thresholds | CELLS pin selects 1- or 2-cell UVLO/LOBAT points without external resistors |
| Internal loop compensation | Eliminates external compensation network; only 4-component solution required |
| Robust protection suite | Includes open-LED clamping (4.7V), UVLO, thermal shutdown, and overcurrent limiting |
Applications
| Rechargeable Flashlights | Portable Medical Lighting |
|---|---|
Use Scenario: Handheld LED flashlights powered by 1–2 NiMH cells requiring long runtime and consistent brightness. IC Role / Device Role / Timing Role: Constant-current boost driver regulating 350mA into white LEDs across declining battery voltage. Use Value: Maintains full LED output until battery reaches 0.85V/cell, then shuts down to prevent deep discharge and cell damage. | Use Scenario: Battery-powered headlamps and examination lights used in field diagnostics and emergency care. IC Role / Device Role / Timing Role: High-efficiency LED driver enabling >90% conversion from low-voltage alkaline/NiMH sources. Use Value: Delivers stable 350mA drive with <1mA quiescent current, extending operational time between battery changes. |
| Industrial Inspection Tools | Emergency Signage Indicators |
Use Scenario: Rugged handheld inspection tools operating in low-temperature environments (–40°C to 85°C). IC Role / Device Role / Timing Role: LED current controller with temperature-compensated UVLO and LOBAT signaling. Use Value: Guarantees reliable shutdown at 0.7V/cell (1-cell) even at –40°C, preventing battery reversal in cold storage. | Use Scenario: Low-power exit signs and hazard indicators using red Luxeon LEDs on primary alkaline batteries. IC Role / Device Role / Timing Role: LED driver adapted for low-VF red LEDs via series resistor or Schottky diode. Use Value: Enables safe operation down to 2.5V output (via external 0.6Ω resistor), meeting red LED minimum bias requirement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3205 | Charge-pump architecture; 2.8V–4.5V input; no inductor required; max 6V output | Lower input voltage range; suited for USB-powered multi-LED displays, not single-cell flashlight use | Select LTC3205 only if inductor-free design and multi-LED parallel driving are required |
| LT3465A | Boost topology with integrated Schottky; 2.7V–16V input; 1.2MHz/2.7MHz selectable frequency | Higher minimum input (2.7V); lacks analog dimming and low-voltage start-up capability | Choose LT3465A for higher-input industrial LED systems where 1V start-up is unnecessary |
Compared with LTC3490EDD#TRPBF, LTC3205 eliminates magnetic components but cannot operate below 2.8V input, while LT3465A offers wider input range but forfeits sub-1V start-up, analog dimming linearity, and single-cell battery protection features essential for portable lighting.
Availability
LTC3490EDD#TRPBF is available at Aetrix Electronics and suitable for rechargeable flashlights, portable medical lighting, and industrial inspection tools requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3490EDD#TRPBF 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
Analog Devices acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear products including the LTC3490 series.
The LTC3490 belongs to Linear's high-efficiency portable LED driver product line, engineered specifically for battery-constrained lighting applications demanding ultra-low start-up voltage, integrated protection, and minimal external component count.
FAQ
What is the minimum input voltage required for the LTC3490EDD#TRPBF to start switching?
The LTC3490EDD#TRPBF has a minimum start-up voltage of 0.9V (typical) and 1.0V (max) per the datasheet. It can begin regulation with as little as 1V input under standard conditions, making it uniquely suited for deeply discharged NiMH or alkaline cells. Once the LED voltage exceeds 2.3V, the device sustains operation even if VIN dips slightly below the start-up threshold - a critical feature for maximizing battery utilization in the LTC3490EDD#TRPBF.
How does the CTRL/SHDN pin provide analog dimming in the LTC3490EDD#TRPBF?
The CTRL/SHDN pin on the LTC3490EDD#TRPBF accepts a voltage from 0.2×VIN to 0.9×VIN to linearly scale the LED current using a 500 mA/V gain factor relative to VIN. For example, at VIN = 2.4V, applying 0.72V (0.3×VIN) yields ~150mA output. Below 0.2×VIN, the LTC3490EDD#TRPBF enters shutdown with <1µA ILED. This architecture decouples dimming from battery voltage drift, ensuring consistent brightness control throughout discharge.
Does the LTC3490EDD#TRPBF require external compensation components?
No, the LTC3490EDD#TRPBF features fully internal loop compensation. Its current-mode boost architecture is factory-tuned to remain stable with only four external components: inductor (3.3µH), output capacitor (4.7µF), input bypass capacitor (optional), and a pull-down resistor on CELLS (if needed). This eliminates compensation networks, reduces BOM count, and simplifies layout - a defining advantage of the LTC3490EDD#TRPBF for space-constrained portable designs.
What protection features are built into the LTC3490EDD#TRPBF?
The LTC3490EDD#TRPBF integrates multiple hardware-level protections: open-LED output clamping (4.2–4.7V), undervoltage lockout (0.7–0.9V/cell for 1-cell, 1.4–1.8V/cell for 2-cell), low-battery flag (LOBAT), thermal shutdown, and cycle-by-cycle current limiting. These functions operate autonomously without software or external supervision, safeguarding both the LED load and battery cells - a core reliability feature of the LTC3490EDD#TRPBF in unattended portable equipment.
Can the LTC3490EDD#TRPBF drive red Luxeon LEDs?
Yes, but with modification: red Luxeon LEDs have lower VF (~2.31V), below the 2.5V minimum required for the LTC3490EDD#TRPBF's internal circuitry to operate reliably. For non-dimming use, add a 0.6Ω series resistor to raise effective VF; for dimming applications, insert a Schottky diode (e.g., MBRM120E) to maintain sufficient output voltage across the dimming range. This adaptation is documented in the LTC3490EDD#TRPBF datasheet application notes.
LTC3490EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- 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):
- 1V
- Voltage - Supply (Max):
- 3.2V
- Voltage - Output:
- 2.8V ~ 4V
- Current - Output / Channel:
- 350mA
- Frequency:
- 1.3MHz
- Dimming:
- Analog
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3490EDD#TRPBF FAQ
1.How can I place an order for LTC3490EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3490EDD#TRPBF 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 LTC3490EDD#TRPBF reliable?
The price and inventory of LTC3490EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3490EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3490EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3490EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3490EDD#TRPBF?
LTC3490EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3490EDD#TRPBF 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 LTC3490EDD#TRPBF?
For technical support, including LTC3490EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3490EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3490EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3490EDD#TRPBF 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 LTC3490EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3490EDD#TRPBF?
All LTC3490EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3490EDD#TRPBF, 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 LTC3490EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3490EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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