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Analog Devices Inc. LTC3490ES8#PBF
- Part No.:
- LTC3490ES8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC3490ES8#PBF.pdf
- Description:
- IC LED DRV RGLTR ANALOG 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,863
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Product details
Overview
LTC3490ES8#PBF from Analog Devices (formerly Linear Technology) is a synchronous boost LED driver IC delivering 350mA constant current for single- or dual-cell NiMH/alkaline-powered portable lighting. It operates from 1V to 3.2V input, provides 2.8V–4V output compliance, and integrates 100mΩ NMOS and 130mΩ PMOS switches in an 8-lead SO package. Used in rechargeable flashlights and high-intensity white LED systems.
For engineers reviewing the LTC3490ES8#PBF datasheet, LTC3490ES8#PBF pinout, LTC3490ES8#PBF application, or LTC3490ES8#PBF 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 thresholds (0.85V/cell), and thermal performance in the narrow SO-8 package.
Technical Context
The LTC3490ES8#PBF implements a current-mode boost converter with internal loop compensation, eliminating external compensation components. Its control architecture uses a 19.2Ω internal sense resistor and a dedicated dimming amplifier that scales ILED linearly with VCTRL/VIN (KCTRL = 500 mA/V) over 0.2–0.9×VIN.
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 shuts down the device at 0.7–0.9V/cell (1-cell) or 1.4–1.8V/cell (2-cell). The 4.7V overvoltage limit protects LEDs during open-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1V to 3.2V - enables operation down to near-dead alkaline/NiMH cells without external LDO pre-regulation. |
| ILED Output | 350mA ±20mA (TA = –40°C to 85°C) - tightly regulated drive current ensures consistent LED brightness and lifetime. |
| VLED Compliance | 2.8V to 4V - supports standard 1W white LEDs (e.g., Luxeon LXHL-BW02) across full forward-voltage range. |
| fSW | 1.3MHz (typ) - allows use of compact 3.3µH inductors and reduces EMI filtering requirements. |
| Efficiency | Up to 90% - achieved via synchronous rectification with 100mΩ NMOS and 130mΩ PMOS switches. |
| IQ / ISHDN | <1mA active / <50µA shutdown - extends battery life in intermittent-use lighting applications. |
| VOVL | 4.2V to 4.7V - limits open-LED fault voltage to safe levels for 5V-rated capacitors and PCB traces. |
Pinout & Package
Package: 8-lead plastic SO (narrow, 0.150″ wide), 3.988mm × 4.988mm × 1.752mm body, exposed pad not present (S8 variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CELLS (1) | Battery configuration select | Logic input setting UVLO/LOBAT thresholds for 1-cell (GND) or 2-cell (VIN) operation. |
| VIN (2) | Main power input | Accepts 1V–3.2V from primary/secondary cells; powers internal circuitry and switch drivers. |
| SW (3) | Switch node | Connects to external inductor; carries high di/dt switching current; requires short, low-inductance trace. |
| GND (4) | Power and signal reference | Common return for VIN, LED current, and internal regulators; must be low-impedance plane. |
| LED (5) | Constant-current output | Sinks regulated 350mA to LED anode; voltage compliance up to 4V; open-circuit limited to 4.7V. |
| CAP (6) | Output filter connection | Connects to 4.7µF low-ESR ceramic capacitor; stabilizes output and filters high-frequency ripple. |
| LOBAT (7) | Open-drain low-battery flag | Asserts low when cell voltage falls below threshold; drives external LED or microcontroller interrupt. |
| CTRL/SHDN (8) | Analog dimming & shutdown control | Voltage between 0.2×VIN and 0.9×VIN linearly scales ILED; <0.2×VIN forces shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous FETs | 100mΩ NMOS + 130mΩ PMOS reduce conduction loss and eliminate external Schottky diode. |
| Internal loop compensation | Eliminates external compensation network - only 4 components required for full operation (inductor, CAP, LED, pull-down). |
| Programmable battery thresholds | CELLS pin selects 1- or 2-cell UVLO/LOBAT thresholds, enabling flexible battery pack design without external resistors. |
| Linear analog dimming | KCTRL = 500 mA/V allows battery-independent brightness control using simple potentiometer from VIN to CTRL/SHDN. |
| Open-LED protection | Hard-clamps output at 4.7V regardless of load condition - prevents capacitor overvoltage and system damage. |
Applications
| Rechargeable Flashlights | Portable Medical Lighting |
|---|---|
Use Scenario: Handheld, battery-powered illumination tools requiring long runtime and consistent lumen output. IC Role / Device Role / Timing Role: Constant-current LED driver with battery monitoring and analog dimming interface. Use Value: Delivers stable 350mA drive across 1–3.2V input range, enabling >5 hours runtime on two NiMH AA cells while signaling low battery via LOBAT. | Use Scenario: Compact, sterile-field LED headlamps and otoscopes used in clinical settings. IC Role / Device Role / Timing Role: Primary LED power controller with UVLO protection to prevent deep discharge of medical-grade batteries. Use Value: 0.85V/cell UVLO preserves battery cycle life; 90% efficiency minimizes heat in sealed enclosures; SO-8 package eases reflow assembly. |
| Emergency Signage Indicators | Industrial Handheld Scanners |
Use Scenario: Low-power exit signs or status indicators powered by coin cells or small alkaline packs. IC Role / Device Role / Timing Role: High-efficiency boost driver enabling LED operation below 1.5V battery voltage. Use Value: 1V start-up capability extends usable battery capacity; <50µA shutdown current enables multi-year shelf life in standby mode. | Use Scenario: Rugged barcode scanners requiring bright, flicker-free illumination in variable ambient light. IC Role / Device Role / Timing Role: Analog-dimmable LED driver synchronized to image capture timing. Use Value: CTRL/SHDN pin allows microcontroller to scale LED current in real time - reducing glare during close-range scans while maintaining SNR. |
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 |
|---|---|---|---|
| LTC3205EFE#PBF | Charge-pump topology; 2.8V–4.5V input; 6V max output; 50µA IQ; QFN-24 package. | Designed for multi-display backlighting with independent channel control - not suited for single high-current LED strings. | Select LTC3490ES8#PBF for boost-based 350mA single-string drive from sub-1.5V sources; LTC3205 for multi-channel, higher-input-voltage display bias. |
| LT3465AES6#TRMPBF | Boost topology; 2.7V–16V input; integrated Schottky; 1.2MHz; 1.9mA IQ; TSOT-23-6 package. | Higher minimum input voltage limits use with depleted NiMH/alkaline; lacks LOBAT and CELL-select logic. | Choose LTC3490ES8#PBF when operating below 2.7V or requiring battery health signaling; LT3465A where input is ≥2.7V and board space is critical. |
Compared with LTC3205EFE#PBF and LT3465AES6#TRMPBF, the LTC3490ES8#PBF uniquely combines ultra-low VIN start-up (1V), integrated battery monitoring (LOBAT/UVLO), and analog dimming in an industry-standard SO-8 package - making it optimal for cost-sensitive, single-LED portable lighting where battery voltage varies widely.
Availability
LTC3490ES8#PBF is available at Aetrix Electronics and suitable for rechargeable flashlights, portable medical lighting, and emergency signage requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3490ES8#PBF 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 its precision analog and power management portfolio. Linear's legacy ICs emphasize high efficiency, minimal external components, and robust operation in harsh environments.
The LTC3490ES8#PBF belongs to Linear's LED driver product line, engineered specifically for portable, battery-constrained lighting applications demanding high efficiency, low quiescent current, and intelligent battery management - not general-purpose DC/DC conversion.
FAQ
What is the minimum input voltage required for the LTC3490ES8#PBF to start switching?
The LTC3490ES8#PBF has a minimum start-up voltage of 0.9V (typical) and guarantees operation down to 1V input. Once the LED voltage exceeds 2.3V, the device sustains regulation even if VIN drops below the start-up threshold - enabling extended runtime from deeply discharged NiMH or alkaline cells. This behavior is confirmed in the Electrical Characteristics table under VIN(START).
How does the CTRL/SHDN pin control LED brightness in the LTC3490ES8#PBF?
In the LTC3490ES8#PBF, the CTRL/SHDN pin provides linear analog dimming: when voltage is between 0.2×VIN and 0.9×VIN, ILED = 500 × (VCTRL/VIN – 0.2) mA. Below 0.2×VIN, the device enters shutdown (<1µA IIN). Above 0.9×VIN, ILED clamps at 350mA. This scaling eliminates battery-voltage dependency in brightness control.
Does the LTC3490ES8#PBF require external compensation components?
No, the LTC3490ES8#PBF features fully internal loop compensation. Only four external components are needed for basic operation: an inductor (3.3µH), output capacitor (4.7µF), LED load, and optional pull-down resistor on CTRL/SHDN. This simplifies layout, reduces BOM count, and improves production yield - as verified in the Functional Diagram and Application Information sections of the datasheet.
What protection features are built into the LTC3490ES8#PBF?
The LTC3490ES8#PBF integrates multiple protections: open-LED output voltage clamping at 4.7V, undervoltage lockout (UVLO) that disables operation below 0.7–0.9V/cell (1-cell) or 1.4–1.8V/cell (2-cell), and a low-battery logic output (LOBAT) that asserts when cell voltage falls below 0.8–1.12V (1-cell) or 1.8–2.24V (2-cell). All are confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables.
Can the LTC3490ES8#PBF drive red Luxeon LEDs without modification?
The LTC3490ES8#PBF requires ≥2.5V LED forward voltage for reliable internal biasing. Red Luxeon LEDs (e.g., LXHL-BD03) have VF ≈ 2.31V at 350mA, falling below this threshold. For non-dimming use, add a 0.6Ω series resistor; for dimming, a Schottky diode (e.g., MBRM120E) is recommended - both solutions are validated in the datasheet's "Red Luxeon LEDs" section and Typical Applications TA06/TA07.
LTC3490ES8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3490ES8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3490ES8#PBF 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#PBF reliable?
The price and inventory of LTC3490ES8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3490ES8#PBF is usually 5 days.
3.What payment methods are accepted for LTC3490ES8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3490ES8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3490ES8#PBF?
LTC3490ES8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3490ES8#PBF 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#PBF?
For technical support, including LTC3490ES8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3490ES8#PBF requirements.
6.How does Aetrix verify that LTC3490ES8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3490ES8#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3490ES8#PBF?
All LTC3490ES8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3490ES8#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3490ES8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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