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Analog Devices Inc. LTC3490ES8#TRPBF
- Part No.:
- LTC3490ES8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC3490ES8#TRPBF.pdf
- Description:
- IC LED DRV RGLTR ANALOG 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
LTC3490ES8#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous boost LED driver IC designed for single- or dual-cell NiMH/alkaline portable lighting. It delivers 350mA constant current with 2.8V–4V output compliance, 1.3MHz fixed-frequency operation, and integrated 100mΩ NMOS switch + 130mΩ PMOS synchronous rectifier-enabling up to 90% efficiency in flashlight and rechargeable LED lamp applications.
For engineers reviewing the LTC3490ES8#TRPBF datasheet, LTC3490ES8#TRPBF pinout, LTC3490ES8#TRPBF application, or LTC3490ES8#TRPBF equivalent, key selection criteria include input voltage range (1V–3.2V), analog dimming via CTRL/SHDN pin (500 mA/V gain), open-LED protection (4.7V clamp), undervoltage lockout (0.85V/cell), and thermal performance in the 8-lead SO package (θJA = 150°C/W).
Technical Context
The LTC3490ES8#TRPBF implements a current-mode boost converter with internal compensation, eliminating external loop components. Its control architecture integrates analog dimming via a linear VCTRL/VIN-scaled current reference and battery monitoring logic that asserts LOBAT when cell voltage drops below 0.8V–1.12V (1-cell) or 1.8V–2.24V (2-cell).
It features dual-threshold undervoltage lockout (UVLO) set by the CELLS pin (logic low for 1-cell, high for 2-cell), synchronous rectification using discrete NMOS/PMOS switches, and overvoltage protection limiting CAP/LED output to ≤4.7V under open-load conditions-ensuring robustness in handheld lighting where load disconnection is common.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1V to 3.2V - supports operation down to near-dead alkaline/NiMH cells without external LDO. |
| ILED Output | 350mA ±20mA (TA = –40°C to 85°C) - tightly regulated drive current for 1W white LEDs. |
| VLED Compliance | 2.8V to 4V - matches forward voltage of standard Luxeon white LEDs at 350mA. |
| fSW | 1.3MHz (typ) - enables use of compact 3.3µH inductor and minimizes audible noise. |
| Efficiency | Up to 90% - achieved via synchronous rectification with 100mΩ NMOS + 130mΩ PMOS switches. |
| Shutdown Current | <50µA - preserves battery life during storage or standby in portable devices. |
| Output OVP | 4.7V (max) - prevents damage to LED or PCB traces if output is disconnected. |
Pinout & Package
Package: 8-lead plastic SO (narrow, 0.150" width), 3.988mm × 4.988mm footprint, 1.752mm max height, exposed pad not present (unlike DD variant). Thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CELLS | Logic select input | Sets UVLO and LOBAT thresholds: GND = 1-cell mode (0.85V/cell UVLO); VIN = 2-cell mode (1.4V/cell UVLO). |
| 2 - VIN | Main supply input | Accepts 1V–3.2V battery input; powers internal circuitry and NMOS gate driver. |
| 3 - SW | Switch node | Connects to inductor; carries pulsed current up to ~2A peak in 1-cell operation. |
| 4 - GND | Power and signal ground | Common return for all internal circuits, sense amp, and external components. |
| 5 - LED | Constant-current output | Sinks 350mA to LED anode; voltage compliance up to 4V; clamped at 4.7V open-circuit. |
| 6 - CAP | Output filter connection | Connects to 4.7µF low-ESR ceramic capacitor; stabilizes output and filters switching ripple. |
| 7 - LOBAT | Open-drain low-battery flag | Active-low signal indicating battery voltage below threshold; requires external pull-up. |
| 8 - CTRL/SHDN | Analog dimming & shutdown control | Voltage between 0.2×VIN and 0.9×VIN scales ILED linearly (500 mA/V); <0.2×VIN enables shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply start-up at 1V | Enables operation from nearly depleted alkaline/NiMH cells without auxiliary bias rails. |
| Integrated NMOS/PMOS power switches | Eliminates need for external MOSFETs or diodes-reducing BOM count and board area. |
| Analog dimming with VIN-referenced scaling | Removes sensitivity to battery voltage decay: dimming ratio remains stable as VIN drops. |
| Programmable 1-/2-cell UVLO and LOBAT | Prevents deep discharge damage while supporting flexible battery configurations in same design. |
| Internally compensated current-mode control | Requires only four external components (inductor, capacitor, resistor, LED) for full functionality. |
Applications
| Rechargeable Flashlights | Portable Medical Lighting |
|---|---|
Use Scenario: Handheld tactical or inspection flashlights powered by 1–2 AA/AAA NiMH cells. IC Role / Device Role / Timing Role: Constant-current LED driver providing stable 350mA output regardless of battery voltage sag. Use Value: Maintains consistent lumen output over full battery discharge curve while enabling analog dimming via potentiometer. | Use Scenario: Battery-powered headlamps and otoscopes used in field diagnostics. IC Role / Device Role / Timing Role: High-efficiency boost driver delivering regulated current to white LEDs with minimal thermal rise in confined enclosures. Use Value: 90% efficiency and <50µA shutdown current extend runtime and reduce heat buildup critical for wearable medical tools. |
| Emergency Signage Indicators | Industrial Handheld Scanners |
Use Scenario: Low-power exit sign or hazard indicator using red/amber Luxeon LEDs on alkaline primary cells. IC Role / Device Role / Timing Role: LED driver with open-circuit protection and low-voltage start-up, adapted for red LEDs via series resistor or Schottky. Use Value: 4.7V OVP prevents overvoltage stress on low-VF red LEDs; 1V start-up ensures operation until battery reaches end-of-life. | Use Scenario: Rugged barcode scanners requiring reliable LED illumination across temperature extremes (–40°C to 85°C). IC Role / Device Role / Timing Role: Temperature-stable current source with guaranteed 350mA output from –40°C to 85°C per datasheet specs. Use Value: Specified ILED tolerance (±20mA) and UVLO hysteresis ensure consistent brightness and prevent premature shutdown in cold industrial environments. |
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 |
|---|---|---|---|
| LT3465ES6#TRPBF | Higher VIN range (2.7V–16V); integrated Schottky; no analog dimming; 1.2MHz fSW | Requires ≥2.7V input - unsuitable for single-cell alkaline/NiMH below 2.7V. | Select when input is ≥2.7V and Schottky integration reduces component count more than dimming capability. |
| LTC3205EFE#PBF | Charge-pump topology; 2.8V–4.5V VIN; 6V max VOUT; 24-pin QFN; multi-channel support | Designed for multi-display backlighting-not optimized for single high-current LED drive. | Choose for multi-LED systems with tight input voltage constraints and need for independent channel control. |
Compared with LT3465ES6#TRPBF and LTC3205EFE#PBF, the LTC3490ES8#TRPBF uniquely supports sub-2V start-up, analog dimming referenced to declining VIN, and single-LED 350mA drive in an 8-pin SO package-making it optimal for cost-sensitive, battery-limited portable lighting where runtime and simplicity are prioritized.
Availability
LTC3490ES8#TRPBF is available at Aetrix Electronics and suitable for rechargeable flashlights, portable medical lighting, and emergency signage requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LTC3490ES8#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, Inc. (acquired Linear Technology in 2017) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs.
The LTC3490 belongs to Linear's precision LED driver product line, engineered specifically for portable, battery-powered lighting applications demanding high efficiency, ultra-low start-up voltage, and minimal external components.
FAQ
What is the minimum input voltage required for LTC3490ES8#TRPBF to start switching?
The LTC3490ES8#TRPBF starts switching at a minimum input voltage of 0.9V (typical) and guarantees operation down to 1V across temperature. This ultra-low start-up voltage enables use with deeply discharged NiMH or alkaline cells-critical for maximizing runtime in portable lighting. The LTC3490ES8#TRPBF continues regulating until VIN drops below the UVLO threshold (0.85V/cell in 1-cell mode), ensuring full utilization of battery capacity.
How does the CTRL/SHDN pin provide analog dimming in LTC3490ES8#TRPBF?
The CTRL/SHDN pin on the LTC3490ES8#TRPBF accepts a voltage from 0.2×VIN to 0.9×VIN to linearly scale the LED current from ~70mA to 350mA, with a gain of 500 mA/V. This VIN-referenced scaling compensates for battery voltage decay, maintaining consistent dimming behavior throughout discharge. When voltage falls below 0.2×VIN, the LTC3490ES8#TRPBF enters shutdown with <50µA quiescent current. The LTC3490ES8#TRPBF does not require external op-amps or DACs for smooth brightness control.
Does LTC3490ES8#TRPBF support both 1-cell and 2-cell battery configurations?
Yes-the LTC3490ES8#TRPBF supports both 1-cell and 2-cell NiMH or alkaline configurations via the CELLS pin. Tying CELLS to GND selects 1-cell mode (UVLO at 0.85V/cell, LOBAT at 0.8V–1.12V/cell); tying CELLS to VIN selects 2-cell mode (UVLO at 1.4V/cell, LOBAT at 1.8V–2.24V/cell). This flexibility allows a single LTC3490ES8#TRPBF design to accommodate different battery packs without hardware changes-reducing SKU count and simplifying inventory for flashlight manufacturers.
What protection features are built into LTC3490ES8#TRPBF?
The LTC3490ES8#TRPBF integrates open-LED overvoltage protection (clamping CAP/LED output to ≤4.7V), undervoltage lockout (preventing deep discharge), low-battery flag (LOBAT), and thermal shutdown. It also limits peak inductor current and uses synchronous rectification to minimize power loss. These protections ensure robust operation in handheld lighting where accidental LED removal, battery depletion, or ambient temperature swings occur. No external protection components are needed for basic reliability-reducing bill-of-materials and improving system-level MTBF for the LTC3490ES8#TRPBF.
Can LTC3490ES8#TRPBF drive red Luxeon LEDs reliably?
Yes-but with adaptation. Red Luxeon LEDs have lower VF (~2.31V), below the LTC3490ES8#TRPBF's 2.5V minimum for internal circuitry operation. For non-dimming use, add a 0.6Ω series resistor to raise output voltage; for dimming applications, a Schottky diode (e.g., MBRM120E) is recommended to maintain sufficient headroom across the dimming range. This ensures stable regulation and avoids dropout in the LTC3490ES8#TRPBF's internal bias network-validated in Linear's TA06 and TA07 reference schematics.
LTC3490ES8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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-SO
LTC3490ES8#TRPBF FAQ
1.How can I place an order for LTC3490ES8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3490ES8#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 LTC3490ES8#TRPBF reliable?
The price and inventory of LTC3490ES8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3490ES8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3490ES8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3490ES8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3490ES8#TRPBF?
LTC3490ES8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3490ES8#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 LTC3490ES8#TRPBF?
For technical support, including LTC3490ES8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3490ES8#TRPBF requirements.
6.How does Aetrix verify that LTC3490ES8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3490ES8#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 LTC3490ES8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3490ES8#TRPBF?
All LTC3490ES8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3490ES8#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 LTC3490ES8#TRPBF part is unused and in its original packaging.
Return procedure for LTC3490ES8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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