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Analog Devices Inc. LTC3453EUF#TRPBF
- Part No.:
- LTC3453EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC3453EUF#TRPBF.pdf
- Description:
- IC LED DRIVER RGLTR 125MA 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,919
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Product details
Overview
LTC3453EUF#TRPBF 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, delivers 90% typical efficiency across the full battery range, and features dual enable pins (EN1/EN2) and dual current-setting resistors (ISET1/ISET2) for four programmable LED current levels including shutdown.
For engineers reviewing the LTC3453EUF#TRPBF datasheet, LTC3453EUF#TRPBF pinout, LTC3453EUF#TRPBF application, or LTC3453EUF#TRPBF equivalent, key selection considerations include its 1MHz fixed-frequency operation, 4mm × 4mm QFN-16 thermally enhanced package with exposed PGND pad, integrated open/shorted LED protection, <2% LED current matching, and 6µA shutdown current - all critical for portable torch/flash LED power management.
Technical Context
The LTC3453EUF#TRPBF employs 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 control loop uses two error amplifiers: a main transconductance amplifier driving the VC compensation node and a safety amplifier that clamps VOUT at ~4.5V during open-LED failure.
Operation transitions seamlessly between buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT) modes via phasing of internal PMOS/NMOS switches A–D. Forward current limit (1612mA typ.) and reverse current limit (200mA typ.) protect against inductor overcurrent in both directions, while undervoltage lockout (UVLO threshold 2.3V rising / 1.9V falling) and overtemperature shutdown (>130°C) ensure robust system-level protection.
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 for transient spikes. |
| Max Output Current | 500mA continuous - enables high-brightness flash/torch operation across 1–4 parallel white LEDs. |
| Switching Frequency | 1MHz (±10%) - allows use of compact 4.7µH inductors and reduces EMI filtering requirements. |
| LED Current Matching | <2% (max) - ensures uniform brightness across multiple LEDs without external calibration. |
| Shutdown Current | 6µA (typ.) - minimizes battery drain during device standby in portable applications. |
| Efficiency | 90% (typ.) over 2.7V–4.2V VIN - maintains high power conversion across entire usable battery range. |
| VOUT Regulation Accuracy | ±2.2% (max) - tight output voltage control preserves LED current stability under varying load/temperature. |
Pinout & Package
Package: 16-lead (4mm × 4mm) plastic QFN with 0.75mm profile and exposed thermal pad (Pin 17 = PGND), JEDEC MO-220 WGGC compliant. Exposed pad must be soldered to PCB ground plane for thermal performance (θJA = 40°C/W, θJC = 2.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Signal input supply | Bypassed by ≥2.2µF ceramic capacitor; connects internally to PVIN for low-noise biasing of control circuitry. |
| EN1 (2) | Torch mode enable | Logic-high activates ISET1-programmed current (e.g., 150mA); threshold 0.65V (rising), 0.2V (falling). |
| ISET1 (3) | Torch current programming | Resistor to GND sets per-LED current: ILED = 384 × (0.8V / RISET1); enables precise low-power illumination. |
| LED1–LED4 (4,6,7,9) | LED current source outputs | Low-dropout (130mV @ 75mA) constant-current sinks; unused pins auto-disabled when tied to VOUT. |
| GND (5,8) | Signal ground | Reference for logic, feedback, and current-sense circuits; must connect to exposed PGND pad. |
| ISET2 (10) | Flash current programming | Resistor to GND sets second current level (e.g., 350mA or 500mA when combined with EN2). |
| EN2 (11) | Flash mode enable | Logic-high activates ISET2-programmed current; dual-enable logic supports four discrete current states. |
| VC (12) | Compensation node | Connects to error amplifier output; 0.1µF ceramic capacitor to GND sets dominant pole for loop stability. |
| VOUT (13) | Buck-boost regulated output | Drives LED anodes; regulated to minimum voltage required by controlling LED (typically ≤4.5V). |
| SW2 (14) | Switching node (C/D) | Connects to one end of external inductor; ties internal NMOS C and PMOS D switches. |
| SW1 (15) | Switching node (A/B) | Connects to other end of external inductor; ties internal PMOS A and NMOS B switches. |
| PVIN (16) | Power input supply | High-current path for switch drivers; must be shorted to VIN (Pin 1) on PCB. |
| PGND (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 four-switch buck-boost topology | Enables seamless VIN-to-VOUT regulation across buck/boost/buck-boost regions without mode-switching artifacts or efficiency dips. |
| Dual independent LED current programming | Supports discrete torch (low-current) and flash (high-current) modes using separate ENx/ISETx pairs - no external DAC or microcontroller needed. |
| Open/shorted LED fault protection | Auto-detects failed LEDs: open-circuit triggers VOUT clamp at 4.5V; short-circuit disables affected current source to prevent thermal runaway. |
| Internal soft-start (0.65ms) | Linearly ramps VC from 0.9V to 2.1V at power-up or wake-from-shutdown, preventing inrush current and output overshoot. |
| Thermally enhanced QFN-16 package | 4mm × 4mm footprint with exposed PGND pad achieves θJC = 2.6°C/W - critical for sustained 500mA LED drive in space-constrained handhelds. |
Applications
| Smartphone Torch Mode | Digital Camera Flash |
|---|---|
Use Scenario: Continuous low-to-mid brightness illumination for video recording or UI backlighting in smartphones. IC Role / Device Role / Timing Role: Constant-current LED driver regulating VOUT to match forward voltage of brightest LED in parallel string. Use Value: 90% efficiency at 2.7V–4.2V input extends battery runtime; <2% current matching ensures uniform display edge lighting. |
Use Scenario: High-intensity pulsed illumination for still image capture in compact digital cameras and camera modules. IC Role / Device Role / Timing Role: Dual-enable controlled high-current source delivering up to 500mA peak to white LEDs for <100ms flash duration. Use Value: 6µA shutdown current prevents battery drain between shots; 1MHz switching enables fast response and small passive size. |
| Portable Medical Device Indicator | Industrial Handheld Scanner |
Use Scenario: Reliable status illumination in battery-powered medical monitors where consistent LED brightness indicates operational state. IC Role / Device Role / Timing Role: Precision current regulator with open-LED detection ensuring fail-safe visual feedback even if one LED fails open. Use Value: Safety error amplifier clamps VOUT at 4.5V during open-LED fault, preventing overvoltage damage to remaining LEDs and system components. |
Use Scenario: Barcode scanning illumination in rugged industrial handhelds requiring stable LED output across wide temperature (-40°C to 85°C). IC Role / Device Role / Timing Role: Thermally robust LED driver with 125°C junction rating and exposed-pad QFN package for conduction cooling in sealed enclosures. Use Value: Overtemperature protection (>130°C) and -40°C to 85°C guaranteed operation ensure reliability in harsh factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3454EUF#TRPBF | 1A max output current (vs. 500mA), same 1MHz frequency and QFN-16 package; higher RDS(ON) PMOS/NMOS switches. | Targeted at higher-power flash applications requiring >500mA; less suitable for low-power torch-only designs due to higher quiescent current (25µA vs. 6µA). | Select LTC3454EUF#TRPBF only when peak LED current exceeds 500mA; otherwise LTC3453EUF#TRPBF offers superior efficiency and lower shutdown current. |
| LTC3216EDE#TRPBF | Charge-pump topology (no inductor), 1A flash + 350mA torch, DFN-16 package; lower efficiency (~85%) below 3.3V input. | Inductorless solution for ultra-thin devices; lacks buck-boost flexibility and cannot regulate efficiently below 2.9V input. | Choose LTC3216EDE#TRPBF for space-constrained designs rejecting inductors; prefer LTC3453EUF#TRPBF when input voltage varies widely (2.7V–5.5V) and inductor use is acceptable. |
Compared with LTC3454EUF#TRPBF and LTC3216EDE#TRPBF, the LTC3453EUF#TRPBF uniquely balances 500mA capability, 90% efficiency down to 2.7V, 6µA shutdown, and robust fault protection - making it optimal for mainstream portable devices needing both reliable torch and moderate flash performance.
Availability
LTC3453EUF#TRPBF is available at Aetrix Electronics and suitable for smartphone illumination, digital camera flash, and portable medical indicator applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3453EUF#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LTC3453EUF#TRPBF belongs to Linear's high-efficiency LED driver product line, designed specifically for battery-powered portable electronics requiring precision current regulation, multi-mode power conversion, and comprehensive fault protection in minimal footprint.
FAQ
What is the maximum continuous LED current supported by the LTC3453EUF#TRPBF?
The LTC3453EUF#TRPBF supports up to 500mA continuous combined output current across its four LED channels. This is achieved when both EN1 and EN2 are asserted and ISET1 and ISET2 are configured for maximum current (e.g., RISET1 = RISET2 = 2.46kΩ). The device enforces this limit via internal forward current sensing on PMOS switch A, triggering immediate shutdown if exceeded.
How does the LTC3453EUF#TRPBF handle an open-circuit LED failure?
When an LED opens, the LTC3453EUF#TRPBF's safety error amplifier detects rising VOUT and clamps regulation at ~4.5V to prevent overvoltage. The remaining LEDs continue operating at their programmed current, though overall efficiency decreases due to higher VOUT. The main error amplifier remains active, maintaining closed-loop control on functional channels.
Can the LTC3453EUF#TRPBF operate from a 2.7V input supply?
Yes, the LTC3453EUF#TRPBF is fully specified to operate from 2.7V to 5.5V input. At 2.7V, it enters boost mode to maintain VOUT sufficient for white LED forward voltage (typically 3.0V–3.6V), achieving 90% typical efficiency - a key design advantage for single-cell Li-Ion systems nearing end-of-discharge.
What is the purpose of the VC pin on the LTC3453EUF#TRPBF?
The VC pin on the LTC3453EUF#TRPBF is the compensation node for the main error amplifier. A 0.1µF ceramic capacitor to GND sets the dominant pole for loop stability. The voltage on VC directly controls duty cycle of internal switches and determines operating mode (buck/boost/buck-boost); its linear ramp during soft-start prevents output overshoot.
Is the LTC3453EUF#TRPBF pin-compatible with other Linear LED drivers like the LTC3454EUF#TRPBF?
No, the LTC3453EUF#TRPBF is not pin-compatible with the LTC3454EUF#TRPBF. Although both use 4mm × 4mm QFN-16 packages, pin functions differ - notably, LTC3454EUF#TRPBF repurposes LED2/LED3 pins for additional control signals and lacks dedicated ISET1/ISET2 pins. PCB layout must be redesigned for substitution.
LTC3453EUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN 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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3453EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3453EUF#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 LTC3453EUF#TRPBF reliable?
The price and inventory of LTC3453EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3453EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3453EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3453EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3453EUF#TRPBF?
LTC3453EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3453EUF#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 LTC3453EUF#TRPBF?
For technical support, including LTC3453EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3453EUF#TRPBF requirements.
6.How does Aetrix verify that LTC3453EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3453EUF#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 LTC3453EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3453EUF#TRPBF?
All LTC3453EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3453EUF#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 LTC3453EUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3453EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3453EUF#TRPBF Tags
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