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Analog Devices Inc. LT3465ES6#TRPBF
- Part No.:
- LT3465ES6#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT3465ES6#TRPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,061
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Product details
Overview
LT3465ES6#TRPBF from Analog Devices (formerly Linear Technology) is a 1.2MHz step-up DC/DC converter IC designed to drive up to six white LEDs in series from a single Li-Ion cell (2.7V–16V input). It integrates a Schottky diode, provides inherent LED current matching, delivers 81% peak efficiency at 3.6V input with four LEDs, and features open-LED protection with 30V output clamping.
For engineers reviewing the LT3465ES6#TRPBF datasheet, LT3465ES6#TRPBF pinout, LT3465ES6#TRPBF application, or LT3465ES6#TRPBF equivalent, key selection criteria include switching frequency (1.2MHz), feedback reference voltage (200mV), integrated Schottky diode, soft-start capability, and SOT-23-6 (ThinSOT) package compatibility for space-constrained portable lighting designs.
Technical Context
The LT3465ES6#TRPBF employs constant-frequency current-mode control with an internal 1.2MHz oscillator, enabling stable regulation and low EMI. Its error amplifier compares FB voltage against a 200mV reference to set peak switch current, while the CTRL pin modulates this reference for analog dimming or shutdown.
It integrates a Schottky diode rated for 1A inrush and 150mA forward current (0.7V drop), eliminates external ballast resistors via series LED configuration, and uses automatic soft-start (600µs) to limit input surge during startup-distinct from the LT3465A's 2.4MHz/no-soft-start variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2MHz - enables use of tiny 22µH inductors and 0.22µF output capacitors, minimizing board area |
| Input Voltage Range | 2.7V to 16V - supports single-cell Li-Ion (3.0–4.2V) and extended input rails up to 16V |
| Max Output Voltage | 30V - clamps open-circuit VOUT to protect LEDs and downstream circuitry |
| Feedback Reference | 200mV ±12mV - sets LED current via external resistor (e.g., 10Ω → 20mA), with <100nA bias current |
| Peak Switch Current | 340mA - limits inductor peak current to ensure safe operation with 22µH/0.71Ω Murata LQH32CN220 |
| Efficiency (Typical) | 81% @ 3.6V, 4 LEDs - achieved with integrated Schottky and optimized gate drive, reducing thermal load |
| Soft-Start Time | 600µs - controls inrush current during startup, preventing input rail sag in battery-powered systems |
Pinout & Package
LT3465ES6#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 1 (VOUT) is marked by a dot; pin numbering follows standard SOT-23 orientation (top view, counterclockwise from mark).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Boost output node | Connects directly to LED anodes and output capacitor; minimize trace length to reduce EMI and voltage spikes |
| GND (Pin 2) | Power ground reference | Must connect to local ground plane with low-inductance path; serves as return for FB resistor and SW node |
| FB (Pin 3) | Current-sense feedback input | Monitors voltage across external RFB; 200mV reference sets ILED = 200mV/RFB; bias current <100nA ensures accuracy |
| CTRL (Pin 4) | Dimming/shutdown control | 0.15V threshold enables chip; <0.05V shuts down; 1.8–3V range provides linear analog dimming; 50kΩ internal impedance |
| VIN (Pin 5) | Main power input | Requires local 1µF X5R/X7R ceramic bypass; absolute max 16V; supplies internal logic and gate driver |
| SW (Pin 6) | Internal power switch drain | Connects to inductor; carries pulsed current up to 340mA; layout must minimize loop area to reduce EMI |
Key Features
| Feature | Design Value |
|---|---|
| Inherently matched LED current | Series LED topology ensures identical current through all LEDs without ballast resistors, eliminating brightness variation |
| Integrated Schottky diode | Eliminates external diode, saving board space and BOM cost; rated for 1A inrush and 150mA continuous forward current |
| Automatic soft-start | 600µs internal ramp limits input surge during startup-critical for Li-Ion battery systems sensitive to peak current |
| Open-LED protection | Clamps VOUT at 30V and reduces switching frequency when LEDs disconnect, preventing overvoltage damage |
| No external compensation required | Stable with 0.22µF ceramic output capacitor due to optimized internal compensation network |
Applications
| Cellular Phone Backlight | PDA Display Lighting |
|---|---|
Use Scenario: Driving 4–6 white LEDs for main LCD backlight in GSM/UMTS handsets powered by single Li-Ion cell. IC Role / Device Role / Timing Role: Step-up DC/DC converter providing regulated constant current to series-connected LEDs. Use Value: 81% efficiency extends talk time; integrated Schottky reduces component count; 1.2MHz switching avoids AM band interference. | Use Scenario: Powering high-brightness QVGA display in handheld computers with variable brightness control. IC Role / Device Role / Timing Role: Constant-current LED driver with analog dimming via CTRL pin voltage scaling. Use Value: 200mV feedback reference enables precise current setting with 1% RFB; soft-start prevents brownout during boot. |
| Digital Camera Flash/AF Assist | GPS Receiver Status Indication |
Use Scenario: Providing short-duration, high-current LED drive for autofocus assist lamp in compact digital cameras. IC Role / Device Role / Timing Role: Boost converter delivering up to 20mA per LED with fast transient response. Use Value: 340mA switch current limit supports brief high-current pulses; 30V open-circuit clamp protects during LED fault. | Use Scenario: Driving dual-color (red/green) status LEDs on GPS navigation units operating from 3.3V or Li-Ion supply. IC Role / Device Role / Timing Role: Dual-path capable LED driver (via external resistor selection) for multi-state visual indicators. Use Value: 2.7V minimum input enables operation down to depleted battery; shutdown current <5µA preserves battery life in standby. |
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 |
|---|---|---|---|
| LT3465AES6#TRPBF | 2.4MHz switching frequency, no internal soft-start, same pinout and FB reference | Better suited for ultra-compact layouts requiring smaller inductors; higher inrush current (≈400mA) at startup | Select LT3465AES6#TRPBF when PCB area is critical and soft-start is not required; verify input capacitance handles higher surge. |
| LT1932ES6#TRPBF | 1.2MHz, lower VIN min (1.0V), higher VOUT max (34V), thinner 6-lead SOT-23 package | Supports single-cell alkaline/NiMH (1.0–10V) and higher-voltage LED strings; lacks soft-start and open-LED clamp | Choose LT1932ES6#TRPBF for wider input range or higher output voltage needs; add external overvoltage protection if required. |
Compared with LT3465ES6#TRPBF, the LT3465AES6#TRPBF trades soft-start for higher frequency and smaller passives, while the LT1932ES6#TRPBF extends input range downward but removes built-in open-circuit protection-making LT3465ES6#TRPBF optimal for Li-Ion-powered portable devices needing robust fault handling and controlled startup.
Availability
LT3465ES6#TRPBF is available at Aetrix Electronics and suitable for cellular phone backlighting, PDA display lighting, digital camera AF assist, and GPS receiver status indication requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LT3465ES6#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 its precision analog and power management portfolio. Linear pioneered high-performance DC/DC converters for portable electronics with emphasis on integration, efficiency, and reliability.
The LT3465 product line was designed specifically for space-constrained white LED backlighting in battery-powered consumer devices, integrating critical functions-including Schottky diode, soft-start, and open-LED protection-to reduce external component count and improve system robustness.
FAQ
What is the maximum number of white LEDs the LT3465ES6#TRPBF can drive?
The LT3465ES6#TRPBF can drive up to six white LEDs in series from a 3.6V Li-Ion supply, as confirmed in the Typical Application Circuits (Figures TA01a–TA04a) and Features list. This assumes typical forward voltage of ~3.0–3.5V per LED, resulting in total VOUT ≤30V-within the device's 30V output clamp limit. Efficiency drops with higher LED counts; Figure TA04b shows 50–65% efficiency for six LEDs at 20mA.
Does the LT3465ES6#TRPBF require an external Schottky diode?
No, the LT3465ES6#TRPBF integrates a Schottky diode rated for 150mA continuous forward current and 1A inrush, eliminating the need for an external diode. This is explicitly stated in the Features ("No External Schottky Diode Required") and Block Diagram (Figure F02), where the diode is shown inside the IC. Using an external diode would be redundant and degrade efficiency.
What is the function of the CTRL pin on the LT3465ES6#TRPBF?
The CTRL pin on the LT3465ES6#TRPBF serves dual functions: analog dimming control and shutdown. When voltage is ≥1.8V, full LED current is delivered; between 0.15V and 1.5V, current scales linearly; below 0.05V, the device shuts down with quiescent current <5µA. The pin has 50kΩ internal impedance, and its bias current is 48–72µA (25°C), as specified in Electrical Characteristics.
What package type does the LT3465ES6#TRPBF use?
The LT3465ES6#TRPBF uses a 6-lead Plastic TSOT-23 (ThinSOT™) package, 1mm profile, per JEDEC MO-193. This is confirmed in the Package Description (page 15), Order Information (page 3), and Pin Configuration diagram (page 2). The "S6" in the part number denotes this specific 6-lead ThinSOT package, and the marking "LTH2" appears on the top surface.
How does the LT3465ES6#TRPBF handle an open-LED fault condition?
During an open-LED fault, the LT3465ES6#TRPBF clamps VOUT at 30V and reduces switching frequency to minimize input current, as described in the Open-Circuit Protection section (page 12) and shown in Figure G05. This prevents overvoltage stress on the output capacitor and other components. The device remains operational in this low-frequency mode until the fault is corrected.
LT3465ES6#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:
- 1.2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LT3465ES6#TRPBF FAQ
1.How can I place an order for LT3465ES6#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3465ES6#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 LT3465ES6#TRPBF reliable?
The price and inventory of LT3465ES6#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3465ES6#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3465ES6#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3465ES6#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3465ES6#TRPBF?
LT3465ES6#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3465ES6#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 LT3465ES6#TRPBF?
For technical support, including LT3465ES6#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3465ES6#TRPBF requirements.
6.How does Aetrix verify that LT3465ES6#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3465ES6#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 LT3465ES6#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3465ES6#TRPBF?
All LT3465ES6#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3465ES6#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 LT3465ES6#TRPBF part is unused and in its original packaging.
Return procedure for LT3465ES6#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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