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Analog Devices Inc. LT3465AES6#TRMPBF
- Part No.:
- LT3465AES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT3465AES6#TRMPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,237
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Product details
Overview
LT3465AES6#TRMPBF from Analog Devices (formerly Linear Technology) is a 2.4MHz constant-frequency step-up DC/DC converter IC optimized for driving up to six white LEDs in series from a single Li-Ion cell (2.7V–16V input). It integrates a Schottky diode, provides open-LED protection, delivers 79% peak efficiency at 3.6V input with four LEDs, and operates in a low-profile 6-lead TSOT-23 package.
For engineers reviewing the LT3465AES6#TRMPBF datasheet, LT3465AES6#TRMPBF pinout, LT3465AES6#TRMPBF application, or LT3465AES6#TRMPBF equivalent, key selection criteria include switching frequency (2.4MHz), integrated Schottky diode, feedback reference voltage (200mV), CTRL pin dimming/shutdown control, and open-circuit output clamping at 30V.
Technical Context
The LT3465AES6#TRMPBF implements current-mode PWM control with a fixed 2.4MHz oscillator-designed to operate above the AM broadcast band-and uses an internal 200mV feedback reference to regulate LED current via external sense resistor. Its integrated Schottky diode eliminates external component requirements while supporting up to 30V output voltage.
Unlike the LT3465 variant, the LT3465A lacks internal soft-start but enables direct PWM dimming on the CTRL pin due to faster switching and reduced startup inrush sensitivity. The device features automatic open-LED protection that clamps VOUT at 30V and reduces switching frequency to limit input current during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.4MHz - enables use of tiny 22µH inductors and 0.22µF ceramic output capacitors, minimizing board area and EMI. |
| Input Voltage Range | 2.7V to 16V - supports single-cell Li-Ion (3.0–4.2V), NiMH, or regulated 5V/12V rails without external LDO. |
| Max Output Voltage | 30V - sufficient to drive six white LEDs (≈3.2V each) in series with headroom for forward voltage variation. |
| Feedback Reference | 200mV ±12mV - precise current regulation via external RFB; e.g., 10Ω yields 20mA LED current. |
| CTRL Pin Thresholds | Enable ≥150mV, Shutdown ≤50mV - allows analog dimming (0.2–1.8V) or digital on/off control with standard logic levels. |
| Peak Switch Current | 340mA - limits inductor saturation and thermal stress; supports ≥20mA per LED across 6-LED string. |
| Efficiency (Typ.) | 79% @ 3.6V, 4 LEDs - achieved with integrated Schottky and low-loss current-mode architecture. |
Pinout & Package
LT3465AES6#TRMPBF is housed in a 6-lead TSOT-23 (ThinSOT™) package: 1.90mm × 1.50mm footprint, 1.00mm max height, JEDEC MO-193 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Boost output node | Connects directly to LED anodes and output capacitor; high dv/dt requires short, low-inductance trace to minimize EMI. |
| GND (Pin 2) | Power and signal ground | Must tie to local ground plane with low-impedance connection; serves as return path for switch, FB, and CTRL currents. |
| FB (Pin 3) | Current-sense feedback input | Monitors voltage across external RFB; regulates LED current to ILED = 200mV / RFB. |
| CTRL (Pin 4) | Dimming and shutdown control | Accepts analog voltage (0.2–1.8V) for linear dimming or PWM (≥1kHz) for digital brightness control; <50mV disables device. |
| VIN (Pin 5) | Main input supply | Requires local 1µF X5R/X7R ceramic bypass capacitor; supports 2.7–16V with 16V absolute max rating. |
| SW (Pin 6) | Internal power switch drain | Connects to inductor; carries high-frequency pulsed current; layout must minimize loop area to reduce radiated noise. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode, reducing BOM count, board space, and forward voltage drop losses (0.7V @ 150mA). |
| Open-LED protection | Clamps VOUT at 30V and reduces switching frequency during LED string open-circuit faults, preventing overvoltage damage. |
| No external soft-start required | Enables direct PWM dimming on CTRL pin without startup delay or inrush current limiting circuitry. |
| AM-band immune switching | 2.4MHz operation avoids interference with AM radio reception (530–1710kHz), critical for handheld consumer devices. |
| Low-profile TSOT-23 package | 1mm height and 6-pin footprint enable ultra-thin designs in space-constrained applications like smartphones and wearables. |
Applications
| Cellular Phones | PDAs & Handheld Computers |
|---|---|
Use Scenario: Backlighting for high-resolution color LCD displays in compact mobile handsets powered by single Li-Ion cells. IC Role / Device Role / Timing Role: Constant-current boost controller regulating six-series white LEDs with inherent current matching and open-circuit fault detection. Use Value: Eliminates ballast resistors and external Schottky diodes, reducing solution size by >30% versus discrete alternatives while maintaining 79% efficiency. | Use Scenario: Display backlight and status indicator illumination in ruggedized PDAs with variable battery voltage (3.0–4.2V). IC Role / Device Role / Timing Role: High-frequency (2.4MHz) step-up converter enabling use of miniature 22µH inductors and 0.22µF ceramic capacitors. Use Value: Avoids AM-band interference and supports analog/PWM dimming for user-adjustable brightness without audible coil whine. |
| Digital Cameras | GPS Receivers |
Use Scenario: Flash LED driver and viewfinder backlight in portable digital cameras requiring burst-mode illumination and low quiescent current. IC Role / Device Role / Timing Role: Boost regulator with shutdown capability (CTRL ≤50mV) and 2.4MHz switching for fast transient response during flash activation. Use Value: Achieves 79% efficiency at 20mA per LED while limiting input current to <400mA during startup-critical for battery life in intermittent-use devices. | Use Scenario: Backlighting for small monochrome or segment LCDs in GPS navigation units operating from automotive USB (5V) or internal Li-Po batteries. IC Role / Device Role / Timing Role: Wide-input (2.7–16V) LED driver supporting both battery and adapter power sources without re-design. Use Value: Integrated 30V output clamp protects display circuitry during cold-cranking or load-dump events in automotive-adjacent environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3465ES6#TRMPBF | 1.2MHz switching frequency; includes internal soft-start; 81% peak efficiency. | Better suited for low-EMI, low-inrush applications where AM-band immunity is not required. | Select LT3465ES6#TRMPBF when minimizing startup current (<200mA) or avoiding high-frequency EMI near sensitive RF sections is critical. |
| LT1932EDD#TRPBF | 1.2MHz, 8-LED capability, lower 1V–10V input range, 1.2mA quiescent current. | Optimized for ultra-low-voltage sources (e.g., single alkaline or NiMH) and higher LED counts. | Choose LT1932EDD#TRPBF for sub-2.7V battery systems or when driving >6 LEDs; not pin-compatible with LT3465AES6#TRMPBF. |
Compared with LT3465ES6#TRMPBF, the LT3465AES6#TRMPBF trades soft-start for AM-band immunity and direct PWM dimming; versus LT1932EDD#TRPBF, it offers wider input range and higher output voltage but fewer LED channels and no sub-2.7V operation.
Availability
LT3465AES6#TRMPBF is available at Aetrix Electronics and suitable for cellular phone backlighting, PDA display illumination, digital camera flash modules, and GPS receiver LCD backlights requiring stable component supply and long-term industrial availability.
Supply support for LT3465AES6#TRMPBF 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 legacy precision analog and power management portfolio with full technical documentation and long-term product support.
The LT3465/LT3465A family was designed specifically for compact, high-efficiency white LED backlighting in battery-powered portable electronics-prioritizing integration (Schottky diode), frequency agility (1.2/2.4MHz), and robust fault protection (open-LED clamp).
FAQ
What is the switching frequency of the LT3465AES6#TRMPBF?
The LT3465AES6#TRMPBF operates at a fixed 2.4MHz switching frequency. This frequency is selected to avoid the AM broadcast band (530–1710kHz), reduce EMI, and allow use of miniature passive components-including 22µH inductors and 0.22µF ceramic output capacitors-without compromising efficiency or stability.
Does the LT3465AES6#TRMPBF require an external Schottky diode?
No, the LT3465AES6#TRMPBF integrates a Schottky diode internally. This eliminates the need for an external diode, reducing bill-of-materials count, PCB area, and forward voltage loss (typical 0.7V at 150mA), thereby improving overall system efficiency and simplifying layout.
How does the LT3465AES6#TRMPBF handle open-LED fault conditions?
When an LED string opens, the LT3465AES6#TRMPBF clamps the VOUT pin at 30V and reduces switching frequency to minimize input current draw. This open-LED protection prevents overvoltage damage to downstream components and ensures safe operation during LED failure or disconnection.
Can the LT3465AES6#TRMPBF be used for analog dimming?
Yes, the LT3465AES6#TRMPBF supports analog dimming via its CTRL pin: applying 0.2V–1.8V adjusts LED current linearly, with full-scale current at ≥1.8V and shutdown below 50mV. For best accuracy, use a precision resistor (1%) for the feedback network and ensure clean CTRL pin biasing.
What package type is used for the LT3465AES6#TRMPBF?
The LT3465AES6#TRMPBF is packaged in a 6-lead TSOT-23 (ThinSOT™) package-measuring 1.90mm × 1.50mm with a maximum height of 1.00mm. It complies with JEDEC MO-193 and is lead-free, RoHS-compliant, and supplied in tape-and-reel format (#TRMPBF).
LT3465AES6#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 2.7V
- Voltage - Supply (Max):
- 16V
- Voltage - Output:
- 30V
- Current - Output / Channel:
- 225mA (Switch)
- Frequency:
- 2.4MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT3465AES6#TRMPBF FAQ
1.How can I place an order for LT3465AES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3465AES6#TRMPBF 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 LT3465AES6#TRMPBF reliable?
The price and inventory of LT3465AES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3465AES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3465AES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3465AES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3465AES6#TRMPBF?
LT3465AES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3465AES6#TRMPBF 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 LT3465AES6#TRMPBF?
For technical support, including LT3465AES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3465AES6#TRMPBF requirements.
6.How does Aetrix verify that LT3465AES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3465AES6#TRMPBF 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 LT3465AES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3465AES6#TRMPBF?
All LT3465AES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3465AES6#TRMPBF, 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 LT3465AES6#TRMPBF part is unused and in its original packaging.
Return procedure for LT3465AES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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