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Analog Devices Inc. LT3466EDD-1#TRPBF
- Part No.:
- LT3466EDD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT3466EDD-1#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 400MA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,464
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Product details
Overview
LT3466EDD-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual-output DC/DC switching regulator integrating a white LED driver and a boost converter in a single 10-lead 3mm × 3mm DFN package. It delivers ±1.5% output voltage accuracy on the boost channel, ±4% LED current programming accuracy, and supports up to 10-series white LEDs from 2.7V–24V input - used in portable display backlighting and OLED bias generation.
For engineers reviewing the LT3466EDD-1#TRPBF datasheet, LT3466EDD-1#TRPBF pinout, LT3466EDD-1#TRPBF application, or LT3466EDD-1#TRPBF equivalent, key selection criteria include independent dimming control per channel, internal Schottky diodes, 200kHz–2MHz programmable switching frequency, overvoltage protection clamping at 39.5V, and thermal performance with θJA = 43°C/W.
Technical Context
The LT3466EDD-1#TRPBF implements two fully independent constant-frequency current-mode PWM converters sharing only oscillator and bandgap reference circuitry. Converter 1 uses a 200mV feedback reference for LED current regulation; Converter 2 uses an 800mV reference for precise boost output voltage regulation.
Each channel features dedicated CTRL pins enabling independent shutdown and analog dimming: CTRL1 adjusts LED current from 0 to full scale (up to 1.8V), while CTRL2 programs FB2 voltage from 0V to 0.8V before clamping at 1V. Soft-start (600µs), undervoltage lockout (2.1V typ), and output overvoltage protection (39.5V) are integrated per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 24V - supports Li-ion, multi-cell alkaline, and automotive supply rails without external pre-regulation. |
| LED Driver Output Accuracy | ±4% LED current programming - enables uniform brightness across 6–10-series white LEDs without ballast resistors. |
| Boost Converter Output Accuracy | ±1.5% VOUT2 regulation - ensures stable TFT-LCD bias or OLED supply under load and line variation. |
| Switching Frequency Range | 200kHz to 2MHz - selectable via RT resistor; higher frequencies allow smaller inductors (e.g., 15µH @ 1.25MHz). |
| Overvoltage Clamp | 39.5V max on both VOUT1 and VOUT2 - protects downstream LEDs/OLEDs during open-circuit fault conditions. |
| Efficiency | 83% driving 8 white LEDs at 15mA from 3.6V - achieved using internal Schottky diodes and low 320mV switch saturation voltage. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive cabin-temperature environments. |
Pinout & Package
LT3466EDD-1#TRPBF is housed in a thermally enhanced 10-lead (3mm × 3mm) plastic DFN package with exposed pad (Pin 11) requiring solder connection to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT1 (Pin 1) | LED driver output | Connects to cathode of LED string; internal Schottky anode tied to SW1; requires local 1µF ceramic output capacitor. |
| SW1 (Pin 2) | LED driver power switch node | Connects to inductor; high dv/dt node - must be routed short and away from sensitive traces like FB1. |
| VIN (Pin 3) | Main input supply | Accepts 2.7V–24V; requires local 1µF X5R/X7R ceramic bypass capacitor close to pin. |
| SW2 (Pin 4) | Boost converter power switch node | Connects to second inductor; shares same layout constraints as SW1 for EMI control. |
| VOUT2 (Pin 5) | Boost converter output | Delivers regulated bias voltage (e.g., 16V @ 30mA); connects to cathode of internal Schottky diode. |
| FB2 (Pin 6) | Boost converter feedback input | Monitors output via resistor divider; nominal 800mV reference - enables accurate VOUT2 setting with 1% resistors. |
| CTRL2 (Pin 7) | Boost converter dimming/shutdown | 0–1V analog control of FB2 voltage; >1V disables adjustment; must not float - tie to GND to disable channel. |
| RT (Pin 8) | Oscillator timing input | Resistor-to-ground sets switching frequency (200kHz–2MHz); nominal 0.54V bias voltage. |
| CTRL1 (Pin 9) | LED driver dimming/shutdown | 0–1.8V analog control of LED current; >1.8V locks full-scale current; internal 100kΩ pull-down prevents floating. |
| FB1 (Pin 10) | LED driver feedback input | Monitors LED current via sense resistor; 200mV reference enables low-loss current setting (e.g., 10Ω for 20mA). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent converters | Enables simultaneous white LED backlighting and OLED/LCD bias generation without cross-talk or shared control limitations. |
| Internal Schottky diodes | Eliminates two external diodes, reduces BOM count and board area, and improves efficiency by avoiding external forward drop losses. |
| Per-channel soft-start | 600µs controlled ramp-up per converter prevents inrush current spikes into output capacitors during power-on or wake-up. |
| Programmable switching frequency | RT-resistor tuning allows optimization between inductor size (higher fSW → smaller L) and efficiency (lower fSW → lower switching loss). |
| Output overvoltage protection | 39.5V clamp on both outputs safeguards LEDs and OLED panels during open-string faults without external crowbar circuitry. |
Applications
| Portable Display Backlighting | OLED Display Bias Supply |
|---|---|
|
Use Scenario: Powering 6–10-series white LEDs in sub-notebook PCs or handheld devices powered by single-cell Li-ion (3.6V). IC Role / Device Role / Timing Role: LED driver channel (Converter 1) regulates constant current through series-connected LEDs; boost channel (Converter 2) remains idle or powers auxiliary circuitry. Use Value: Eliminates need for ballast resistors and factory calibration; ±4% current accuracy ensures consistent brightness across all units. |
Use Scenario: Generating stable 16V/30mA bias for monochrome or color OLED displays in PDAs and digital cameras. IC Role / Device Role / Timing Role: Boost converter (Converter 2) delivers regulated high-voltage output; LED driver (Converter 1) may power status indicators or remain disabled. Use Value: ±1.5% output voltage accuracy maintains OLED contrast and lifetime; internal Schottky diode reduces heat and footprint vs discrete solutions. |
| TFT-LCD Panel Bias Generation | Automotive Infotainment Displays |
|
Use Scenario: Providing AVDD and VGH voltages for small-format TFT-LCD modules in industrial HMIs or medical monitors. IC Role / Device Role / Timing Role: Dual-channel operation supplies multiple bias rails - e.g., 12V for gate drive and 5V for source driver logic from one IC. Use Value: Independent CTRL1/CTRL2 pins allow synchronized or staggered startup; wide 2.7V–24V input accommodates varying system rail conditions. |
Use Scenario: Driving LED backlights and powering OLED overlays in automotive center-stack displays operating across cold-crank (6V) to load-dump (24V) conditions. IC Role / Device Role / Timing Role: Regulator manages both lighting and display bias under harsh automotive transients; exposed pad enhances thermal reliability at junction temperatures up to 125°C. Use Value: –40°C to +85°C rating meets AEC-Q200 ambient requirements; OVP and UVLO protect against battery disconnect and alternator surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output LED driver and boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3466EDD-1#TRPBF | Same die, rebranded post-Analog Devices acquisition; identical electrical specs, pinout, and DFN-10 package. | No functional difference; used interchangeably in new designs and legacy BOM updates. | Select when sourcing from distributors listing LTC-branded stock or requiring Analog Devices' unified support documentation. |
| MAX16832ATP+ | Single-channel white LED driver only; no integrated boost converter; requires external MOSFET and diode; 65V output capability. | Suitable only for LED-only applications; cannot replace dual-function requirement without adding second IC and passive components. | Choose only if design separates LED and bias functions, or requires >39.5V output - but adds complexity and board area. |
Compared with LT3466EDD-1#TRPBF, the LTC3466EDD-1#TRPBF offers identical performance and drop-in compatibility, while the MAX16832ATP+ lacks integrated boost functionality and demands additional external circuitry - making it unsuitable as a direct dual-channel replacement.
Availability
LT3466EDD-1#TRPBF is available at Aetrix Electronics and suitable for portable display backlighting, OLED bias generation, and TFT-LCD panel supply applications requiring stable component supply, long-term manufacturability, and automotive-grade temperature resilience.
Supply support for LT3466EDD-1#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. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT3466EDD-1#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for space-constrained portable electronics requiring dual regulated outputs with minimal external components.
FAQ
What is the maximum number of white LEDs the LT3466EDD-1#TRPBF can drive in series?
The LT3466EDD-1#TRPBF can drive up to 10 white LEDs in series from a 3.6V supply, leveraging its 39.5V overvoltage clamp and internal 320mV switch saturation voltage to maintain regulation across typical forward voltage drops (3.0V–3.6V per LED). This capability is confirmed in the device's Typical Application circuits and Electrical Characteristics table.
Does the LT3466EDD-1#TRPBF require external Schottky diodes?
No, the LT3466EDD-1#TRPBF integrates two Schottky diodes - one per converter - eliminating the need for external diodes. Each has a typical forward drop of 0.85V at 300mA and reverse leakage <5µA at 20V, as specified in the Electrical Characteristics table. This integration reduces bill-of-materials count and PCB area.
How is the switching frequency set on the LT3466EDD-1#TRPBF?
The switching frequency of the LT3466EDD-1#TRPBF is set using an external resistor (RT) connected from Pin 8 (RT) to ground. The device supports 200kHz to 2MHz; for example, 63.4kΩ yields ~800kHz, 48.7kΩ yields ~1MHz, and 20.5kΩ yields ~2MHz. The RT pin maintains a nominal 0.54V bias voltage during operation.
Can the LT3466EDD-1#TRPBF operate from a 24V input supply?
Yes, the LT3466EDD-1#TRPBF supports an absolute maximum input voltage of 24V and operates continuously across 2.7V to 24V. Its internal switches, Schottky diodes, and feedback networks are rated for this full range, and the datasheet confirms stable operation up to 24V in both Electrical Characteristics and Absolute Maximum Ratings tables.
What is the purpose of the exposed pad (Pin 11) on the LT3466EDD-1#TRPBF?
The exposed pad (Pin 11) on the LT3466EDD-1#TRPBF is electrically connected to ground and serves as the primary thermal path. It must be soldered directly to the PCB ground plane to achieve the specified θJA = 43°C/W and ensure reliable operation at full load across –40°C to +85°C. Leaving it unconnected degrades thermal performance and risks thermal shutdown.
LT3466EDD-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-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:
- 2
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 24V
- Voltage - Output:
- 39.5V
- Current - Output / Channel:
- 400mA
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LT3466EDD-1#TRPBF FAQ
1.How can I place an order for LT3466EDD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3466EDD-1#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 LT3466EDD-1#TRPBF reliable?
The price and inventory of LT3466EDD-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3466EDD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3466EDD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3466EDD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3466EDD-1#TRPBF?
LT3466EDD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3466EDD-1#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 LT3466EDD-1#TRPBF?
For technical support, including LT3466EDD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3466EDD-1#TRPBF requirements.
6.How does Aetrix verify that LT3466EDD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3466EDD-1#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 LT3466EDD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3466EDD-1#TRPBF?
All LT3466EDD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3466EDD-1#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 LT3466EDD-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3466EDD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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