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Analog Devices Inc. LT3465AES6#TRPBF
- Part No.:
- LT3465AES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT3465AES6#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,250
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Product details
Overview
LT3465AES6#TRPBF from Analog Devices (formerly Linear Technology) is a 2.4MHz constant-frequency step-up DC/DC converter IC designed to drive up to six white LEDs in series from a single Li-Ion cell. It integrates a Schottky diode, features open-LED protection, delivers 79% peak efficiency at 3.6V input and 4-LED load, and operates across 2.7V–16V input range with 30V maximum output voltage.
For engineers reviewing the LT3465AES6#TRPBF datasheet, LT3465AES6#TRPBF pinout, LT3465AES6#TRPBF application, or LT3465AES6#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed LED driver specifications, and real-world dimming control behavior - all specific to the LT3465A variant in SOT-23 package.
Technical Context
The LT3465AES6#TRPBF uses current-mode PWM control with a fixed 2.4MHz oscillator to minimize EMI and enable compact 0.22µF output capacitance. Its internal Schottky diode eliminates external diode requirements while supporting up to 340mA switch current limit and 300mV switch saturation voltage at 250mA.
Unlike the LT3465, the LT3465A omits internal soft-start - enabling direct PWM dimming at the CTRL pin - and relies on fast switching to suppress AM-band interference. Feedback regulation targets 200mV at the FB pin, with LED current set by RFB = 200mV / ILED.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 2.4MHz - enables use of tiny 22µH inductors and 0.22µF ceramic output capacitor; avoids AM broadcast band. |
| Input Voltage Range | 2.7V to 16V - supports single-cell Li-Ion (3.0–4.2V), two-cell alkaline, or USB-powered operation. |
| Max Output Voltage | 30V - sufficient to drive six 3.2V white LEDs (19.2V forward) with margin for sensing and ripple. |
| Peak Efficiency | 79% at VIN = 3.6V, 4-LED load - measured with Murata LQH32CN220 inductor and X5R/X7R capacitors. |
| Feedback Reference | 200mV ±12mV (0°C to 85°C) - sets LED current via external resistor: ILED = 200mV / RFB. |
| CTRL Pin Thresholds | 150mV to enable, 50mV to shut down - allows precise analog dimming or logic-level PWM control. |
| Switch Current Limit | 340mA - protects internal MOSFET during startup, short-circuit, or overcurrent conditions. |
Pinout & Package
LT3465AES6#TRPBF is housed in a low-profile (1mm height) 6-lead TSOT-23 (ThinSOT™) plastic package per JEDEC MO-193, with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Boost output node | Connects to anode of LED string and output capacitor; high dv/dt node requiring short trace to minimize EMI. |
| GND (Pin 2) | Power and signal ground | Must connect directly to local ground plane; serves as return for switch, feedback, and control paths. |
| FB (Pin 3) | Current-sense feedback input | Monitors voltage across RFB; regulates LED current by maintaining 200mV at this pin. |
| CTRL (Pin 4) | Dimming and shutdown control | Accepts analog voltage (0–1.8V) or PWM signal; 0V = shutdown, ≥1.8V = full current, 150–50mV = enable/disable threshold. |
| 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 switch drain node | Connects to inductor; carries high-frequency pulsed current; requires tight layout to reduce ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode, reduces BOM count and board area; rated for 1A inrush and continuous conduction. |
| No external soft-start circuit required | Enables direct PWM dimming at CTRL pin without filtering delay - critical for responsive backlight control. |
| Open-LED protection | Clamps VOUT at 30V and reduces switching frequency to limit power dissipation when LED string opens. |
| Inherently matched LED current | Series LED connection ensures identical current across all LEDs without ballast resistors or current mirrors. |
| AM-band interference avoidance | 2.4MHz switching frequency places fundamental and harmonics above 1.6MHz AM broadcast band (530–1710kHz). |
Applications
| Cellular Phone Backlight | Digital Camera Flash Support |
|---|---|
|
Use Scenario: Driving 4–6 white LEDs for main display backlight in slim mobile handsets powered by 3.6V Li-Ion battery. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED string current via FB pin feedback and CTRL-based dimming. Use Value: Delivers stable brightness across battery discharge (3.0–4.2V), achieves >79% efficiency, and avoids audible noise by operating above 2MHz. |
Use Scenario: Providing regulated current to 2–3 high-brightness white LEDs used as auxiliary flash or focus assist in compact digital cameras. IC Role / Device Role / Timing Role: Step-up converter with fast transient response, enabling burst-mode flash control via PWM on CTRL pin. Use Value: Supports rapid on/off cycling with no soft-start delay; integrated Schottky enables compact layout and reliable start-up under cold temperature. |
| PDA Display Illumination | GPS Receiver Status Indication |
|
Use Scenario: Powering monochrome or color TFT display backlights in handheld PDAs with limited PCB area and thermal budget. IC Role / Device Role / Timing Role: High-frequency boost regulator delivering precise current to 3–5 LED string, controlled via analog voltage or PWM. Use Value: 2.4MHz operation allows smallest possible passive components; 1mm profile fits ultra-thin form factors; 79% efficiency extends battery runtime. |
Use Scenario: Driving single or dual status LEDs (e.g., GPS lock, satellite acquisition) in portable navigation devices with variable input voltage. IC Role / Device Role / Timing Role: Low-quiescent-current (2.6mA typical) LED driver providing consistent luminance despite 2.7–16V input variation. Use Value: Maintains LED brightness across wide input range; open-LED protection prevents damage if indicator LED fails open-circuit. |
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#TRPBF | 1.2MHz switching frequency; includes internal soft-start; 81% peak efficiency. | Better suited for low-EMI, low-inrush designs where AM-band suppression is less critical than startup control. | Select LT3465ES6#TRPBF when minimizing input surge current is prioritized over PWM dimming responsiveness. |
| LT1932EMS#TRPBF | 1.2MHz, 10V max input, 34V max output, 1.2mA quiescent current, ThinSOT-6 package. | Optimized for lower-input systems (1V–10V); supports up to 8 LEDs but lacks open-LED clamp at 30V. | Choose LT1932EMS#TRPBF for sub-3V supply rails or higher LED count; verify open-circuit protection requirements. |
Compared with LT3465ES6#TRPBF and LT1932EMS#TRPBF, the LT3465AES6#TRPBF trades soft-start for direct PWM capability and shifts switching frequency to avoid AM interference - making it optimal for compact, responsive, battery-powered LED backlighting where input voltage stays above 2.7V.
Availability
LT3465AES6#TRPBF is available at Aetrix Electronics and suitable for cellular phone backlighting, digital camera flash circuits, PDA display illumination, and GPS receiver status indication requiring stable component supply and long-term production continuity.
Supply support for LT3465AES6#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 product support, documentation, and manufacturing continuity for legacy Linear parts including the LT3465 family.
The LT3465/LT3465A product line was engineered specifically for space-constrained portable electronics requiring efficient, integrated white LED backlight drivers with minimal external components and robust fault protection.
FAQ
What is the key functional difference between LT3465AES6#TRPBF and LT3465ES6#TRPBF?
The LT3465AES6#TRPBF operates at 2.4MHz and omits internal soft-start to enable direct PWM dimming at the CTRL pin, whereas the LT3465ES6#TRPBF switches at 1.2MHz and includes soft-start for reduced inrush current. Both share identical pinout, package, and core functionality - the choice depends on whether AM-band avoidance or startup current control is prioritized in the LT3465AES6#TRPBF design.
Does LT3465AES6#TRPBF require an external Schottky diode?
No, the LT3465AES6#TRPBF integrates a Schottky diode capable of sustaining 1A inrush current and continuous conduction, eliminating the need for an external diode. This integration reduces component count, PCB area, and potential failure points - confirmed in the device block diagram, absolute maximum ratings, and typical application schematics for LT3465AES6#TRPBF.
What is the minimum LED current achievable with LT3465AES6#TRPBF before pulse skipping occurs?
The LT3465AES6#TRPBF can drive a 3-LED string at 0.2mA LED current without pulse skipping when using a 1kΩ resistor from FB to GND. Below this level, pulse skipping begins, resulting in low-frequency ripple - though average current remains regulated. This behavior is explicitly documented in the "Minimum Output Current" section of the LT3465AES6#TRPBF datasheet.
How does open-LED protection work in LT3465AES6#TRPBF?
When the LED string opens, the LT3465AES6#TRPBF clamps VOUT at 30V and reduces switching frequency to minimize power dissipation. This prevents overvoltage damage to the IC and external components. The clamping action and low-frequency fallback mode are verified in the "Open-Circuit Protection" section and Typical Performance Characteristics (Figure 3465A G05) of the LT3465AES6#TRPBF datasheet.
Can LT3465AES6#TRPBF be used with input voltages below 2.7V?
No - the absolute minimum operating voltage for LT3465AES6#TRPBF is 2.7V, as specified in the Electrical Characteristics table. Operation below this threshold is not guaranteed and may result in unstable regulation or failure to start. For sub-2.7V applications, alternative parts like LT1932 (1V min) should be evaluated instead of assuming LT3465AES6#TRPBF functionality.
LT3465AES6#TRPBF 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#TRPBF FAQ
1.How can I place an order for LT3465AES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3465AES6#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 LT3465AES6#TRPBF reliable?
The price and inventory of LT3465AES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3465AES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3465AES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3465AES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3465AES6#TRPBF?
LT3465AES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3465AES6#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 LT3465AES6#TRPBF?
For technical support, including LT3465AES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3465AES6#TRPBF requirements.
6.How does Aetrix verify that LT3465AES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3465AES6#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 LT3465AES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3465AES6#TRPBF?
All LT3465AES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3465AES6#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 LT3465AES6#TRPBF part is unused and in its original packaging.
Return procedure for LT3465AES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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