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Analog Devices Inc. LTC3454EDD#PBF
- Part No.:
- LTC3454EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3454EDD#PBF.pdf
- Description:
- IC LED DRIVER RGLTR 1A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,104
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Product details
Overview
LTC3454EDD#PBF from Analog Devices (formerly Linear Technology) is a synchronous buck-boost DC/DC converter optimized for driving single high-power white LEDs at up to 1A from a 2.7V–5.5V Li-ion or alkaline input. It operates in buck, boost, or buck-boost mode automatically, achieves >90% efficiency in torch mode, and features dual enable inputs with four programmable LED current levels including shutdown. It is used in cell phone camera flash and torch lighting systems.
For engineers reviewing the LTC3454EDD#PBF datasheet, LTC3454EDD#PBF pinout, LTC3454EDD#PBF application, or LTC3454EDD#PBF equivalent, key selection criteria include its 1MHz fixed-frequency operation, 3.5% LED current programming accuracy, open/shorted LED protection, and thermally enhanced 10-lead DFN package with exposed ground pad.
Technical Context
The LTC3454EDD#PBF implements a proprietary four-switch buck-boost topology with auto-phased switching across VIN–VOUT relationships: buck mode when VIN > VOUT, boost when VIN < VOUT, and continuous 4-switch buck-boost region near VIN ≈ VOUT. Its VC pin serves as the error amplifier output and compensation node, with internal soft-start clamping VC from 0.9V to 2.1V over 200μs.
It integrates dual LED current setting amplifiers referenced to 800mV, forward current limiting (3.4A typical), reverse current limiting (275mA typical), undervoltage lockout (~1.9V), overtemperature protection (130°C trip), and safety error amplification that limits VOUT to ~5.15V during LED open-circuit fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports full discharge curve of single-cell Li-ion (2.7V–4.2V) and 3-cell alkaline (4.5V). |
| Max Continuous LED Current | 1A - enables high-brightness torch mode and pulsed flash operation without external current sense resistor. |
| LED Current Accuracy | ±3.5% - ensures consistent brightness across units and temperature, critical for camera flash exposure control. |
| Switching Frequency | 1MHz (0.9–1.15MHz) - allows use of compact 4.7μH inductors and 10μF ceramic output capacitors. |
| Efficiency (Torch Mode) | >90% typical at ILED = 150mA - minimizes thermal load and extends battery runtime in always-on lighting applications. |
| Shutdown Supply Current | 0μA - eliminates battery drain during device standby, essential for portable electronics power management. |
| Package Thermal Resistance | θJA = 40°C/W - enabled by exposed-pad DFN; requires PCB thermal vias for sustained 1A operation at 85°C ambient. |
Pinout & Package
The LTC3454EDD#PBF is housed in a 10-lead (3mm × 3mm), 0.75mm profile plastic DFN package with an exposed thermal pad (Pin 11) that must be soldered to PCB ground for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 (Pin 1) | Enable Input for ISET1 | Logic-high (>0.68V) activates current set by RISET1; high-impedance input-must not float. |
| EN2 (Pin 2) | Enable Input for ISET2 | Logic-high (>0.68V) activates current set by RISET2; combined with EN1, enables sum of both programmed currents. |
| ISET1 (Pin 3) | Current Programming Input | Sets base LED current via resistor to GND: ILED = 3850 × (0.8V / RISET1). |
| ISET2 (Pin 4) | Current Programming Input | Sets secondary LED current: ILED = 3850 × (0.8V / RISET2); adds to ISET1 current when both enables active. |
| LED (Pin 5) | Low-Dropout LED Output Terminal | Connects cathode of LED; voltage drop ≤105mV at 1A - minimizes conduction loss and heat in high-current path. |
| SW2 (Pin 6) | Switching Node | Connects to one end of external inductor; pairs with SW1 to form buck-boost power stage. |
| VOUT (Pin 7) | Buck-Boost Output Rail | Provides regulated output to LED anode; bypassed with 10μF ceramic capacitor for ripple suppression. |
| VC (Pin 8) | Error Amplifier Compensation Node | Internal transconductance amp output; requires 0.1μF ceramic capacitor to GND for loop stability. |
| VIN (Pin 9) | Main Power Input | Supplies IC core and gate drivers; requires ≥10μF low-ESR ceramic bypass capacitor. |
| SW1 (Pin 10) | Switching Node | Connects to other end of external inductor; forms complementary switching pair with SW2. |
| Exposed Pad (Pin 11) | Thermal & Electrical Ground | Mandatory solder connection to PCB ground plane for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-Phased Buck-Boost Topology | Seamlessly transitions between buck, 4-switch, and boost modes without output discontinuity or audible noise. |
| Dual Independent Enable Inputs | Supports discrete torch (150mA), flash (1A), mixed (850mA), and shutdown states using only two logic signals. |
| Integrated Safety Error Amplifier | Clamps VOUT at ~5.15V during LED open-circuit failure, preventing overvoltage damage to downstream components. |
| Zero Shutdown Current | Draws 0μA when both EN1 and EN2 are grounded - eliminates quiescent drain in battery-powered sleep states. |
| Thermally Enhanced DFN Package | 3mm × 3mm footprint with exposed pad delivers θJA = 40°C/W - enables 1A continuous operation without heatsink. |
Applications
| Cell Phone Camera Flash | Cell Phone Torch Lighting |
|---|---|
Use Scenario: Short-duration, high-intensity illumination for smartphone image capture in low-light environments. IC Role / Device Role / Timing Role: Constant-current LED driver delivering precisely timed 1A pulses synchronized with camera shutter and image sensor integration period. Use Value: Enables consistent flash exposure with ±3.5% current accuracy and fast start-up transient response (<5ms to full current). | Use Scenario: Continuous, user-activated illumination for navigation or emergency lighting in handheld devices. IC Role / Device Role / Timing Role: High-efficiency buck-boost regulator maintaining stable 150mA LED current across full battery discharge (2.7V–4.2V). Use Value: Delivers >90% efficiency at 150mA, extending usable battery life by >25% versus less efficient alternatives. |
| Digital Camera Flash | PDAs with LED Backlight/Indicator |
Use Scenario: Compact point-and-shoot or action cameras requiring reliable flash performance in space-constrained designs. IC Role / Device Role / Timing Role: Single-chip LED driver with integrated current sensing, fault protection, and thermal shutdown - no external sense resistor or protection diodes required. Use Value: Reduces BOM count by 4 components versus discrete solutions while meeting IEC 62368-1 touch-temperature safety limits. | Use Scenario: Status indication or auxiliary lighting in legacy PDAs with limited board area and tight power budgets. IC Role / Device Role / Timing Role: Low-quiescent, programmable current source supporting multiple brightness levels via dual resistor programming. Use Value: Zero shutdown current and 1MHz operation allow use of tiny 0402 inductors and 0603 capacitors, minimizing footprint to <12mm² total. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3453EFE#PBF | QFN-16 package; max 500mA output; no dual-enable programming - uses single ISET pin with external DAC or PWM. | Targeted at lower-power LED backlighting or indicator applications where 1A flash is unnecessary. | Select when thermal budget is tighter but peak current demand is ≤500mA; offers better EMI performance due to slower 600kHz switching. |
| LTC3440EDD#PBF | Same 10-lead DFN package; 600mA/1.2A dual-output capability; 2MHz switching; higher IQ (25μA vs. 825μA in operation). | Designed for multi-LED systems (e.g., RGB indicators) requiring independent current control per channel. | Select when driving two separate LEDs or needing higher frequency for smaller magnetics; not suitable for single 1A flash due to per-channel current limit. |
Compared with LTC3453EFE#PBF and LTC3440EDD#PBF, the LTC3454EDD#PBF uniquely combines 1A continuous drive, dual-enable discrete current selection, and seamless buck-boost operation in a thermally optimized DFN - making it the only choice for space-constrained, high-brightness single-LED flash/torch systems requiring zero shutdown current and robust fault protection.
Availability
LTC3454EDD#PBF is available at Aetrix Electronics and suitable for cell phone camera flash, digital camera lighting, and PDA status illumination requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for LTC3454EDD#PBF 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, datasheets, and application engineering for legacy Linear parts including the LTC3454EDD#PBF.
The LTC3454EDD#PBF belongs to Linear's high-efficiency LED driver product line, designed specifically for portable imaging and illumination systems requiring wide-input-voltage buck-boost regulation, precise current control, and integrated fault protection.
FAQ
What is the maximum continuous LED current supported by the LTC3454EDD#PBF?
The LTC3454EDD#PBF supports up to 1A continuous LED current when both EN1 and EN2 are asserted and RISET1||RISET2 ≤ 3080Ω. This rating assumes proper PCB thermal design with the exposed pad soldered to a ≥4 cm² copper area using ≥4 thermal vias. Peak current capability reaches 1.25A for short-duration flash pulses.
How does the LTC3454EDD#PBF handle LED open-circuit faults?
When the LED opens, the LTC3454EDD#PBF's safety error amplifier takes control and regulates VOUT to approximately 5.15V, preventing destructive overvoltage. This behavior is confirmed in the Electrical Characteristics table under "Regulated Maximum VOUT" and verified in Typical Performance Characteristic Figure G11–G13. The main error amplifier remains inactive below this threshold.
Can the LTC3454EDD#PBF operate from a 3-cell alkaline battery?
Yes - the LTC3454EDD#PBF accepts 2.7V to 5.5V input, fully covering the 4.5V nominal (3.0V–4.8V) range of fresh-to-dead 3-cell alkaline batteries. Its buck-boost architecture maintains regulation even as voltage drops below typical white LED forward voltage (~3.2V), unlike fixed-buck or fixed-boost alternatives.
What is the purpose of the VC pin on the LTC3454EDD#PBF?
The VC pin on the LTC3454EDD#PBF is the output of the internal transconductance error amplifier and serves as the compensation node for the voltage-mode PWM control loop. A 0.1μF ceramic capacitor must be connected from VC to GND to set the dominant pole and ensure stability across all operating modes (buck, boost, buck-boost).
Does the LTC3454EDD#PBF require external Schottky diodes for reliable operation?
No - the LTC3454EDD#PBF uses synchronous rectification with internal MOSFETs and does not require external Schottky diodes. However, optional Schottky diodes (e.g., MBRM120T3) across SW1–GND or SW2–GND may improve peak efficiency by ~1–2% in high-load boost mode by reducing break-before-make voltage drop during NMOS-to-PMOS transitions.
LTC3454EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 5.15V
- Current - Output / Channel:
- 1A
- Frequency:
- 1MHz
- Dimming:
- -
- Applications:
- Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3454EDD#PBF FAQ
1.How can I place an order for LTC3454EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3454EDD#PBF 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 LTC3454EDD#PBF reliable?
The price and inventory of LTC3454EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3454EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3454EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3454EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3454EDD#PBF?
LTC3454EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3454EDD#PBF 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 LTC3454EDD#PBF?
For technical support, including LTC3454EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3454EDD#PBF requirements.
6.How does Aetrix verify that LTC3454EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3454EDD#PBF 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 LTC3454EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3454EDD#PBF?
All LTC3454EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3454EDD#PBF, 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 LTC3454EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3454EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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