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Analog Devices Inc. LTC3454EDD#TRPBF
- Part No.:
- LTC3454EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3454EDD#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR 1A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,321
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Product details
Overview
LTC3454EDD#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous buck-boost DC/DC converter IC optimized for driving single high-power white LEDs at up to 1A from a 2.7V–5.5V Li-Ion or multi-cell alkaline input. It operates in buck, boost, or buck-boost mode automatically based on VIN vs. VLED, achieves >90% PLED/PIN efficiency in torch mode, and features dual enable inputs (EN1/EN2) and dual ISET resistors for four discrete LED current levels including shutdown.
For engineers reviewing the LTC3454EDD#TRPBF datasheet, LTC3454EDD#TRPBF pinout, LTC3454EDD#TRPBF application, or LTC3454EDD#TRPBF equivalent, key selection considerations include its 1MHz fixed-frequency operation, 3.5% LED current programming accuracy, open/shorted LED protection, zero shutdown current, and thermally enhanced 10-lead 3mm × 3mm DFN package with exposed GND pad.
Technical Context
The LTC3454EDD#TRPBF implements a proprietary four-switch buck-boost topology with auto-phased PMOS/NMOS power switches (A/B/C/D), enabling seamless transitions between buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT) modes without output discontinuity. Its voltage-mode PWM control loop uses an autozeroing transconductance error amplifier referenced to an internal 1.23V bandgap, with VC pin serving as compensation node.
Internal safety features include forward current limit (3.4A typical), reverse current limit (275mA typical), undervoltage lockout (1.90V falling threshold), overtemperature protection (130°C trip, 11°C hysteresis), and a dedicated safety error amplifier that clamps VOUT at ~5.15V during LED open-circuit fault. Soft-start limits VC slew rate to 0.9V→2.1V over 200μs.
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/flash operation with thermal management via exposed DFN pad. |
| LED Current Accuracy | ±3.5% - ensures consistent brightness across units and temperature (–40°C to 85°C). |
| Switching Frequency | 1MHz (0.9–1.15MHz) - allows use of compact 4.7μH inductors and low-ESR ceramic capacitors. |
| Efficiency (Torch Mode) | >90% typical at ILED = 150mA - minimizes battery drain during extended illumination. |
| Shutdown Supply Current | 0μA - eliminates battery leakage when EN1 = EN2 = GND. |
| Operating Temp Range | –40°C to +85°C - qualified for consumer handheld and industrial portable lighting applications. |
| Package Thermal Resistance | θJA = 40°C/W - requires PCB-exposed pad soldering for reliable 1A operation at ambient ≤85°C. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = GND). Low-profile 0.75mm height enables thin mobile designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 (Pin 10) | High-side switching node | Connects to one end of external inductor; carries full switching current in all modes. |
| VIN (Pin 9) | Main power input | Supplies IC bias and switch drivers; requires ≥10μF ceramic bypass to GND. |
| VC (Pin 8) | Error amplifier compensation node | External 0.1μF capacitor sets dominant pole; controls loop stability and transient response. |
| VOUT (Pin 7) | Buck-boost regulated output rail | Drives LED anode; bypassed with ≥10μF ceramic capacitor to minimize ripple. |
| SW2 (Pin 6) | Low-side switching node | Connects to other end of external inductor; complements SW1 in 4-switch operation. |
| EN1 (Pin 1), EN2 (Pin 2) | Dual digital enable inputs | Logic-high enables corresponding ISET current path; both low = 0A shutdown (0μA IQ). |
| ISET1 (Pin 3), ISET2 (Pin 4) | LED current programming inputs | Resistor-to-GND sets current contribution: ILED = 3850 × (0.8V / RSET). |
| LED (Pin 5) | LED cathode return path | Low-dropout output stage sinks programmed current; connects directly to LED cathode. |
| Exposed Pad (Pin 11) | Thermal & electrical ground | Mandatory PCB solder connection for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-selecting buck/boost/buck-boost topology | Eliminates need for separate regulators; maintains >80% efficiency across full 2.7V–5.5V input range. |
| Dual independent enable & ISET inputs | Enables four discrete LED current states (0mA, 150mA, 850mA, 1A) without external logic or MCU GPIOs. |
| Integrated open/short LED protection | Safety error amp clamps VOUT at 5.15V during open-circuit; current limiting prevents damage during short-circuit. |
| 1MHz constant-frequency operation | Reduces EMI filtering requirements and enables use of miniature 4.7μH shielded inductors (e.g., Sumida CDRH6D28-5RONC). |
| Zero-current shutdown | Removes standby drain from battery-critical for always-on flashlight/torch functions in portable devices. |
| Thermally enhanced DFN package | 3mm × 3mm footprint with exposed GND pad delivers θJA = 40°C/W, supporting 1A continuous LED drive at TA ≤ 85°C. |
Applications
| Cell Phone Camera Flash | Cell Phone Torch Lighting |
|---|---|
Use Scenario: Brief high-current pulse (≤500ms) to illuminate subject during photo capture. IC Role / Device Role / Timing Role: Constant-current LED driver with flash-enabling EN2 input and 1A peak capability. Use Value: Delivers 1A flash current with >80% efficiency even at 2.7V battery voltage, extending usable flash cycles per charge. |
Use Scenario: Sustained medium-brightness illumination for navigation or emergency lighting. IC Role / Device Role / Timing Role: Regulated torch-mode driver using EN1 input and 150mA/850mA programmable current. Use Value: Achieves >90% PLED/PIN efficiency across full battery discharge, maximizing runtime at 150mA setting. |
| Digital Camera Auxiliary Light | Portable Medical Inspection Lamp |
Use Scenario: Compact auxiliary focus light in DSLR/mirrorless camera bodies or lens-integrated modules. IC Role / Device Role / Timing Role: High-efficiency buck-boost LED driver with minimal BOM (1 inductor, 2 caps, 2 resistors). Use Value: 3mm × 3mm DFN package fits tight camera module spaces while delivering stable 500mA output. |
Use Scenario: Battery-powered handheld inspection lamp requiring consistent color temperature and brightness. IC Role / Device Role / Timing Role: Precision current source with ±3.5% accuracy and thermal foldback via OT protection. Use Value: Maintains calibrated LED output over –40°C to +85°C ambient, critical for clinical-grade visual assessment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3440EDD#TRPBF | 600mA max output, 2MHz switching, same DFN-10 package but no dual-enable ISET architecture. | Limited to lower-power torches; lacks discrete flash/torch current selection without external logic. | Select when 600mA suffices and higher frequency allows smaller magnetics; not drop-in for 1A flash. |
| LTC3453EFE#TRPBF | QFN-16 package, 500mA max, integrated soft-start and current-sense resistor; no EN1/EN2 dual control. | Targeted at cost-sensitive mid-power lighting; lacks programmable multi-level current without DAC. | Choose for simpler 500mA designs where board space permits larger QFN; not pin-compatible or functionally equivalent. |
Compared with LTC3454EDD#TRPBF, LTC3440EDD#TRPBF trades 1A flash capability for 2MHz operation and smaller inductors, while LTC3453EFE#TRPBF reduces feature set and output current to lower cost-neither replicates the dual-enable, four-level, 1A buck-boost functionality in the same 3mm × 3mm footprint.
Availability
LTC3454EDD#TRPBF is available at Aetrix Electronics and suitable for cell phone camera flash, portable medical inspection lamps, and digital camera auxiliary lighting requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for LTC3454EDD#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 with rigorous automotive and industrial qualification standards.
The LTC3454EDD#TRPBF belongs to Linear's high-efficiency LED driver product line, designed specifically for portable battery-powered lighting where input voltage varies widely and thermal constraints demand compact, efficient regulation.
FAQ
What is the maximum continuous LED current supported by the LTC3454EDD#TRPBF?
The LTC3454EDD#TRPBF supports up to 1A continuous LED current when properly heatsinked via its exposed thermal pad. This is achieved using dual ISET resistors (e.g., RISET1 = 20.5kΩ, RISET2 = 3.65kΩ) with both EN1 and EN2 asserted. The device includes overtemperature protection that disables switching if junction temperature exceeds 130°C, safeguarding reliability under sustained load.
How does the LTC3454EDD#TRPBF select between buck, boost, and buck-boost operating modes?
The LTC3454EDD#TRPBF automatically selects mode based on real-time comparison of VIN and required VOUT (determined by LED forward voltage and programmed current). Internal control logic phases the four power switches (A/B/C/D) to operate as a synchronous buck (VIN > VOUT), synchronous boost (VIN < VOUT), or four-switch buck-boost (VIN ≈ VOUT) - all transparent to the user with no external configuration needed.
What protection features are integrated into the LTC3454EDD#TRPBF?
The LTC3454EDD#TRPBF integrates forward current limit (3.4A typical), reverse current limit (275mA typical), undervoltage lockout (1.90V falling threshold), overtemperature protection (130°C trip), open-LED protection (safety amp clamps VOUT at ~5.15V), and shorted-LED current limiting. These features eliminate the need for external fault-handling circuitry in robust portable lighting designs.
Can the LTC3454EDD#TRPBF be used with a single alkaline cell?
No - the LTC3454EDD#TRPBF requires minimum 2.7V input, making it incompatible with a single 1.5V alkaline cell. However, it is fully compatible with 3-cell alkaline (4.5V nominal) and 2-cell NiMH (2.4V min) sources, as confirmed by the typical application circuit using a 3-cell alkaline input at 4.5V. Input must remain ≥2.7V for proper UVLO and regulation.
What is the purpose of the VC pin on the LTC3454EDD#TRPBF?
VC is the compensation node for the internal autozeroing transconductance error amplifier. A capacitor (typically 0.1μF ceramic) from VC to GND sets the dominant pole of the control loop, ensuring stability across buck/boost/buck-boost transitions. Unlike standard compensation pins, VC also serves as the soft-start clamp point, linearly slewing from 0.9V to 2.1V over 200μs during startup.
LTC3454EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3454EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3454EDD#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 LTC3454EDD#TRPBF reliable?
The price and inventory of LTC3454EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3454EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3454EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3454EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3454EDD#TRPBF?
LTC3454EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3454EDD#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 LTC3454EDD#TRPBF?
For technical support, including LTC3454EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3454EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3454EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3454EDD#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 LTC3454EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3454EDD#TRPBF?
All LTC3454EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3454EDD#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 LTC3454EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3454EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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