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Analog Devices Inc. LTC3453EUF#PBF
- Part No.:
- LTC3453EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC3453EUF#PBF.pdf
- Description:
- IC LED DRIVER RGLTR 125MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,304
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Product details
Overview
LTC3453EUF#PBF from Analog Devices (formerly Linear Technology) is a synchronous buck-boost DC/DC converter IC optimized for driving up to four white LEDs at combined currents up to 500mA from a single Li-Ion battery (2.7V–4.2V). It operates in buck, boost, or buck-boost mode depending on input-to-LED forward voltage relationship, achieves 90% typical efficiency across the full battery range, and delivers regulated LED current via dual ISET resistors and dual enable pins (EN1/EN2).
For engineers reviewing the LTC3453EUF#PBF datasheet, LTC3453EUF#PBF pinout, LTC3453EUF#PBF application, or LTC3453EUF#PBF equivalent, key selection considerations include its 1MHz fixed-frequency operation, 4mm × 4mm QFN-16 thermally enhanced package with exposed PGND pad, ±2% LED current matching, open/shorted LED protection, and 6µA shutdown quiescent current.
Technical Context
The LTC3453EUF#PBF implements a proprietary four-switch synchronous buck-boost architecture that dynamically selects the LED requiring the highest forward voltage at programmed current to set VOUT-minimizing dropout and maximizing power efficiency. Its VC pin serves as the error amplifier output node, controlling switch duty cycles across three operating regions (buck, buck-boost, boost) based on real-time VIN–VOUT relationship.
Internal protection includes forward current limiting (1612mA typ), reverse current limiting (200mA typ), undervoltage lockout (1.6V–2.3V hysteresis), overtemperature shutdown (130°C trip, 11°C hysteresis), and safety error amplifier clamping of VOUT to 4.5V during LED open-circuit failure. Soft-start time is fixed at 0.65ms.
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) with margin. |
| Output Current Capability | Up to 500mA total - programmable in four levels (0/150/350/500mA) via dual ISET resistors and EN1/EN2 logic. |
| Switching Frequency | 1MHz (±10%) - enables use of compact 4.7µH inductor and reduces EMI filtering burden. |
| LED Current Matching | <2% (max–min)/avg - ensures uniform brightness across multiple LEDs without external calibration. |
| Shutdown Supply Current | 6µA (typ) - minimizes battery drain during device idle states. |
| Efficiency | 90% (typ) over 2.7V–4.2V input - achieved via adaptive mode selection and low RDS(ON) switches (0.25Ω NMOS / 0.3Ω PMOS). |
| Operating Temperature | –40°C to +85°C - qualified for portable consumer electronics environments. |
Pinout & Package
The LTC3453EUF#PBF is housed in a 16-lead, 4mm × 4mm plastic QFN package with 0.75mm profile and thermally enhanced exposed PGND pad (Pin 17), which must be soldered to PCB ground for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Signal Input Supply | Bypassed with ≥2.2µF ceramic capacitor; connects to PVIN for low-impedance path to internal circuitry. |
| EN1 (Pin 2) | Torch Mode Enable | Logic-high activates ISET1-defined current (e.g., 150mA); threshold is 0.65V (rising), 0.2V (falling). |
| ISET1 (Pin 3) | Torch Current Programming | Resistor to GND sets per-LED current: ILED = 384 × (0.8V / RISET1). |
| LED1–LED4 (Pins 4,6,7,9) | Current Source Outputs | Low-dropout (130mV @ 75mA) constant-current sinks; unused pins must tie to VOUT for auto-disable. |
| GND (Pins 5,8) | Signal Ground | Reference for control circuitry; must connect to exposed PGND pad (Pin 17) for thermal and noise integrity. |
| ISET2 (Pin 10) | Flash Current Programming | Resistor to GND sets second current level; combined with ISET1 when both EN1/EN2 active. |
| EN2 (Pin 11) | Flash Mode Enable | Logic-high activates ISET2-defined current (e.g., 350mA); independent timing control from EN1. |
| VC (Pin 12) | Error Amplifier Output | Compensation node for loop stability; requires ≥0.1µF ceramic capacitor to GND. |
| VOUT (Pin 13) | Buck-Boost Regulated Output | Drives LED anodes; bypassed with ≥4.7µF ceramic capacitor; clamped to 4.5V during LED open fault. |
| SW2 (Pin 14) | Switch Node C/D | Connects to one end of external inductor; ties to internal NMOS C and PMOS D switches. |
| SW1 (Pin 15) | Switch Node A/B | Connects to other end of external inductor; ties to internal PMOS A and NMOS B switches. |
| PVIN (Pin 16) | Power Input Supply | High-current path for VIN; must connect directly to VIN (Pin 1) and local bulk capacitance. |
| PGND (Pin 17) | Power Ground / Exposed Pad | Thermal and electrical ground for power switches; mandatory solder connection to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck-Boost Architecture | Four internal MOSFETs (0.25Ω NMOS / 0.3Ω PMOS) enable seamless transition between buck, boost, and buck-boost modes without efficiency penalty. |
| Adaptive LED Regulation | Dynamically selects the LED with highest forward voltage at programmed current to regulate VOUT - minimizing dropout and maximizing PLED/PIN. |
| Dual-Mode LED Current Control | Independent torch (EN1/ISET1) and flash (EN2/ISET2) programming allows simultaneous or separate activation of 150mA/350mA/500mA output levels. |
| Robust Fault Protection | Integrated open/short LED detection, forward/reverse current limiting, UVLO (1.6V–2.3V), and overtemperature shutdown (130°C) ensure system reliability. |
| Thermally Optimized QFN Package | 4mm × 4mm footprint with exposed PGND pad (θJA = 40°C/W) enables high-power LED drive in space-constrained portable designs. |
Applications
| Smartphone Torch Lighting | Digital Camera Flash |
|---|---|
Use Scenario: Continuous low-brightness illumination for video capture or UI feedback in smartphones. IC Role / Device Role / Timing Role: Constant-current LED driver regulating VOUT to match dynamic forward voltage of parallel white LEDs powered from a single Li-Ion cell. Use Value: Delivers stable 150mA output with <2% current matching and 90% efficiency down to 2.7V input - extending usable battery life during extended torch use. | Use Scenario: High-intensity pulsed illumination for still image capture in compact digital cameras. IC Role / Device Role / Timing Role: Dual-enable controlled flash driver delivering 500mA peak current with fast turn-on and precise pulse timing via EN2. Use Value: Enables 500mA flash current with 6µA shutdown current and integrated reverse-current limiting - preventing inductor energy dump during short pulses. |
| Portable Media Player Display Backlight | Handheld Barcode Scanner Illumination |
Use Scenario: Uniform backlighting for small LCD displays in media players using 2–4 white LEDs. IC Role / Device Role / Timing Role: Multi-channel constant-current source with automatic disable of unused LED outputs to reduce standby power. Use Value: Achieves <2% current matching across all channels and auto-senses unconnected LEDx pins - eliminating need for external current balancing or dummy loads. | Use Scenario: Short-duration, high-brightness LED illumination for barcode reading in handheld scanners. IC Role / Device Role / Timing Role: Fast-response LED driver with soft-start (0.65ms) and overtemperature protection to handle repeated flash cycles. Use Value: Maintains consistent 350mA output under thermal stress with 11°C hysteresis on overtemperature shutdown - ensuring reliable operation during burst-mode scanning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3454EUF#PBF | Higher 1A output capability; same 1MHz frequency and QFN-16 package; lacks dual-enable flexibility (single ISET). | Targeted at single high-power LED or higher-current multi-LED arrays where 500mA is insufficient. | Select LTC3454EUF#PBF only if >500mA continuous LED current is required; not drop-in due to different enable/control scheme. |
| LTC3216EDE#PBF | Charge-pump topology (no inductor); 1A flash/torch with independent current paths; lower efficiency (~85%) but smaller solution size. | Preferred for ultra-thin devices where inductor height or EMI sensitivity prohibits inductive solutions. | Choose LTC3216EDE#PBF when board height or EMI constraints outweigh efficiency needs; incompatible pinout and control interface. |
Compared with LTC3453EUF#PBF, LTC3454EUF#PBF offers higher current but reduced configurability, while LTC3216EDE#PBF trades efficiency for inductor-free integration - making LTC3453EUF#PBF optimal for balanced performance in mainstream Li-Ion-powered portable lighting.
Availability
LTC3453EUF#PBF is available at Aetrix Electronics and suitable for smartphone torch lighting, digital camera flash, and portable media player backlighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3453EUF#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 its legacy precision analog and power management product lines with full technical and manufacturing continuity.
The LTC3453EUF#PBF belongs to Linear's high-efficiency LED driver family, designed specifically for portable Li-Ion-powered lighting applications demanding high current accuracy, adaptive voltage regulation, and robust fault protection in minimal PCB area.
FAQ
What is the maximum continuous LED current supported by the LTC3453EUF#PBF?
The LTC3453EUF#PBF supports up to 500mA total continuous LED current when both EN1 and EN2 are asserted and ISET1 and ISET2 are configured for maximum combined output. This limit is enforced by internal current sensing and thermal design - exceeding it risks junction temperature rise beyond 125°C even with proper PCB thermal management.
How does the LTC3453EUF#PBF achieve 90% efficiency across the full Li-Ion voltage range?
The LTC3453EUF#PBF achieves 90% typical efficiency by dynamically selecting the most efficient operating mode (buck, buck-boost, or boost) based on real-time VIN and LED forward voltage, using low-RDS(ON) synchronous MOSFETs (0.25Ω NMOS / 0.3Ω PMOS), and regulating VOUT precisely to the minimum voltage required by the highest-VF LED - minimizing dropout losses.
Can unused LED output pins on the LTC3453EUF#PBF be left floating?
No - unused LEDx pins (e.g., LED3 and LED4 when driving only two LEDs) must be connected to VOUT. The LTC3453EUF#PBF uses a 30µA detect current on each LEDx pin to identify unused outputs and disable their current sources; floating pins cause undefined behavior and potential regulation instability.
What is the purpose of the VC pin on the LTC3453EUF#PBF, and what capacitor value is recommended?
The VC pin is the output of the main error amplifier and serves as the compensation node for the regulation loop. A minimum 0.1µF ceramic capacitor to GND is required for stability; larger values (e.g., 0.22µF) improve transient response but reduce bandwidth. The LTC3453EUF#PBF's transconductance amplifier (gm ≈ 1/5.2kΩ) sets unity-gain frequency at fUG = gm/(2π·CVC).
Does the LTC3453EUF#PBF provide protection against LED open-circuit failure?
Yes - the LTC3453EUF#PBF includes a dedicated safety error amplifier that monitors VOUT and clamps it to approximately 4.5V if any LED opens. This prevents runaway output voltage while maintaining correct current regulation on remaining functional LEDs, ensuring continued operation with reduced overall efficiency.
LTC3453EUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN 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:
- 4
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 4.5V
- Current - Output / Channel:
- 125mA
- Frequency:
- 1MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
LTC3453EUF#PBF FAQ
1.How can I place an order for LTC3453EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3453EUF#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 LTC3453EUF#PBF reliable?
The price and inventory of LTC3453EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3453EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3453EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3453EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3453EUF#PBF?
LTC3453EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3453EUF#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 LTC3453EUF#PBF?
For technical support, including LTC3453EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3453EUF#PBF requirements.
6.How does Aetrix verify that LTC3453EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3453EUF#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 LTC3453EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3453EUF#PBF?
All LTC3453EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3453EUF#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 LTC3453EUF#PBF part is unused and in its original packaging.
Return procedure for LTC3453EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3453EUF#PBF Tags
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