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Analog Devices Inc. LT3465ES6#TRMPBF
- Part No.:
- LT3465ES6#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LT3465ES6#TRMPBF.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,670
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Product details
Overview
LT3465ES6#TRMPBF from Analog Devices (formerly Linear Technology) is a 1.2MHz constant-frequency step-up DC/DC converter IC optimized for driving up to six white LEDs in series from a single Li-Ion cell. It integrates a Schottky diode, features inherent LED current matching, open-LED protection, and automatic soft-start. Designed for compact portable displays, it delivers 81% efficiency at 3.6V input driving four 20mA white LEDs.
For engineers reviewing the LT3465ES6#TRMPBF datasheet, LT3465ES6#TRMPBF pinout, LT3465ES6#TRMPBF application, or LT3465ES6#TRMPBF equivalent, key selection criteria include switching frequency (1.2MHz), integrated Schottky diode, 200mV feedback reference, 2.7V–16V input range, and SOT-23-6 (ThinSOT) package compatibility with space-constrained handheld designs.
Technical Context
The LT3465ES6#TRMPBF employs current-mode control with a fixed 1.2MHz oscillator to ensure stable regulation across line and load variations. Its internal 200mV feedback reference and exponential CTRL-to-current transfer function enable precise analog dimming without external compensation.
It integrates a 300mV VCE(SAT) power switch and a 0.7V Schottky diode, eliminating external discrete components while maintaining low thermal resistance in the 1mm-profile TSOT-23 package. Open-circuit protection clamps VOUT at 30V and reduces switching frequency to limit input current during LED string failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.2MHz - 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 direct operation from single-cell Li-Ion (2.7–4.2V) and extended input rails up to 16V. |
| 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 - High-accuracy reference enabling precise LED current setting via external RFB (e.g., 10Ω for 20mA). |
| Efficiency | 81% at 3.6V/VIN, 4-LED/20mA - Delivers high power conversion efficiency critical for battery runtime in portable devices. |
| Soft-Start Time | 600µs - Limits inrush current during startup, reducing stress on input capacitors and source impedance. |
| CTRL Pin Threshold | 150mV to enable, 50mV to shut down - Provides robust noise-immune digital on/off control and analog dimming down to ~0.2mA. |
Pinout & Package
LT3465ES6#TRMPBF is housed in a 6-lead plastic TSOT-23 (ThinSOT™) package, 1mm height, JEDEC MO-193 compliant, with exposed pad not connected internally. The package supports reflow soldering per IPC-J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Boost output node | Connects directly to LED anodes and output capacitor; trace minimization reduces EMI and voltage spikes. |
| GND (Pin 2) | Power and signal ground | Must connect to local ground plane with low-inductance path; serves as return for switch, FB resistor, and CTRL bias. |
| FB (Pin 3) | Current-sense feedback input | Senses voltage across RFB; 200mV reference sets LED current as ILED = 200mV / RFB. |
| CTRL (Pin 4) | Dimming and shutdown control | Analog dimming input (0–1.8V) or digital enable (≥150mV)/shutdown (≤50mV); internal bias current 48–72µA. |
| VIN (Pin 5) | Main input supply | Requires local 1µF X5R/X7R ceramic bypass capacitor; accepts 2.7–16V with 16V absolute max rating. |
| SW (Pin 6) | Internal power switch collector | Connects to inductor; switches at 1.2MHz with 300mV saturation voltage and 340mA current limit. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Schottky diode | Eliminates external diode, saving PCB area and reducing BOM count while maintaining 0.7V forward drop at 150mA. |
| Inherently matched LED current | Series LED topology ensures identical current through all LEDs without ballast resistors, improving display uniformity. |
| Open-LED protection | Clamps VOUT at 30V and drops switching frequency to minimize input current when LED string opens. |
| Automatic soft-start | 600µs internal ramp limits peak inrush current, preventing input rail droop and capacitor stress at startup. |
| No external compensation required | Stable with standard 22µH inductor and 0.22µF output capacitor; simplifies design and reduces component count. |
Applications
| Cellular Phone Display Backlight | PDA Main Screen Illumination |
|---|---|
Use Scenario: Driving 4–6 white LEDs for main LCD backlight in GSM/UMTS handsets with Li-Ion battery input. IC Role / Device Role / Timing Role: Constant-current boost controller providing regulated 20mA per LED with analog dimming via baseband processor GPIO. Use Value: Integrated Schottky and 1.2MHz switching allow <5mm² solution size; 81% efficiency extends talk time by >12% vs. competing 600kHz solutions. |
Use Scenario: Powering high-brightness QVGA TFT backlight in ruggedized PDAs operating across –20°C to 70°C ambient. IC Role / Device Role / Timing Role: Primary LED driver IC managing thermal derating and open-circuit fault response during hot-swap battery replacement. Use Value: 30V open-circuit clamp and –40°C to 85°C guaranteed operation prevent display flicker or shutdown during field use. |
| Digital Camera Flash Assist Light | GPS Receiver Status Indicator |
Use Scenario: Providing steady illumination for autofocus assist and video preview in compact digital cameras. IC Role / Device Role / Timing Role: Low-noise boost converter delivering 5–15mA to 3-white-LED string with PWM-dimming compatibility. Use Value: 1.2MHz switching avoids AM band interference; 0.22µF output cap enables ultra-thin camera bezel integration. |
Use Scenario: Driving dual-color (red/green) status LEDs on automotive-grade GPS modules with wide input voltage tolerance. IC Role / Device Role / Timing Role: Dual-string capable LED driver supporting independent brightness control via two CTRL pins (using dual variant). Use Value: 2.7–16V input range accommodates vehicle battery transients; integrated protection eliminates need for external TVS on LED lines. |
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#TRMPBF | 2.4MHz switching frequency, no internal soft-start, identical pinout and feedback architecture. | Better suited for AM-band-sensitive applications (e.g., FM radio coexistence); requires external PWM dimming due to missing soft-start. | Select LT3465AES6#TRMPBF when EMI filtering is critical and inrush current can be managed externally. |
| LT1932ES6#TRMPBF | 1.2MHz, lower 1V–10V input range, 34V VOUT(MAX), 1.2mA quiescent current vs. 2.6mA (LT3465). | Optimized for single-cell alkaline/NiMH (1–1.5V) or low-VIN LiFePO4 systems; lacks open-LED clamp at 30V. | Choose LT1932ES6#TRMPBF for sub-2.7V input sources or where ultra-low IQ is prioritized over fault protection. |
Compared with LT3465ES6#TRMPBF, the LT3465AES6#TRMPBF offers higher frequency for smaller magnetics but sacrifices soft-start, while LT1932ES6#TRMPBF supports lower input voltages at the cost of reduced fault protection and narrower VIN range.
Availability
LT3465ES6#TRMPBF is available at Aetrix Electronics and suitable for cellular phone backlighting, PDA display illumination, digital camera assist lighting, and GPS status indication requiring stable component supply and long-term industrial availability.
Supply support for LT3465ES6#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 full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT3465 family.
The LT3465ES6#TRMPBF belongs to Linear's white LED boost driver product line, engineered specifically for space-constrained, battery-powered portable electronics requiring high-efficiency, integrated, and fault-protected LED current regulation.
FAQ
What is the maximum number of white LEDs the LT3465ES6#TRMPBF can drive?
The LT3465ES6#TRMPBF is specified to drive up to six white LEDs in series from a 3.6V Li-Ion supply. This assumes typical white LED forward voltage of ≈3.2V per diode, resulting in ≈19.2V total, well within the device's 30V maximum output voltage rating and headroom for variation and ripple.
Does the LT3465ES6#TRMPBF require an external Schottky diode?
No, the LT3465ES6#TRMPBF integrates a Schottky diode with 0.7V forward drop at 150mA and 4µA leakage at 30V. This eliminates the need for an external diode, reducing bill-of-materials count, PCB area, and potential layout-induced EMI.
How does dimming work on the LT3465ES6#TRMPBF?
Dimming on the LT3465ES6#TRMPBF is achieved via the CTRL pin: applying 0–1.8V provides analog dimming with exponential current control, while ≥150mV enables operation and ≤50mV shuts down the device. Full-scale current (e.g., 20mA) occurs at ≥1.8V.
What protection features does the LT3465ES6#TRMPBF include?
The LT3465ES6#TRMPBF includes open-LED protection (clamping VOUT at 30V and reducing switching frequency), overvoltage lockout, thermal shutdown, and current-limit protection (340mA typical). These features safeguard both the IC and connected LEDs during fault conditions.
Is the LT3465ES6#TRMPBF pin-compatible with the LT3465AES6#TRMPBF?
Yes, the LT3465ES6#TRMPBF and LT3465AES6#TRMPBF share identical 6-lead TSOT-23 pinout, footprint, and electrical interface. The only functional differences are switching frequency (1.2MHz vs. 2.4MHz) and presence of internal soft-start (LT3465 only).
LT3465ES6#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:
- 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#TRMPBF FAQ
1.How can I place an order for LT3465ES6#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3465ES6#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 LT3465ES6#TRMPBF reliable?
The price and inventory of LT3465ES6#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3465ES6#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3465ES6#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3465ES6#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3465ES6#TRMPBF?
LT3465ES6#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3465ES6#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 LT3465ES6#TRMPBF?
For technical support, including LT3465ES6#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3465ES6#TRMPBF requirements.
6.How does Aetrix verify that LT3465ES6#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3465ES6#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 LT3465ES6#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3465ES6#TRMPBF?
All LT3465ES6#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3465ES6#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 LT3465ES6#TRMPBF part is unused and in its original packaging.
Return procedure for LT3465ES6#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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