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Analog Devices Inc. LTC3452EUF#PBF
- Part No.:
- LTC3452EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3452EUF#PBF.pdf
- Description:
- IC LED DRIVER RGLTR 25MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:182
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Product details
Overview
LTC3452EUF#PBF from Analog Devices (formerly Linear Technology) is a synchronous buck-boost DC/DC converter optimized for dual-bank white LED driving in portable devices. It delivers up to 5 × 20mA to MAIN display LEDs and up to 200mA to CAMERA flash LEDs, operates from 2.7V–5.5V input, achieves ≥85% efficiency across Li-ion battery range, and integrates independent current control, 1MHz fixed-frequency operation, and open/shorted LED protection.
For engineers reviewing the LTC3452EUF#PBF datasheet, LTC3452EUF#PBF pinout, LTC3452EUF#PBF application, or LTC3452EUF#PBF equivalent, key selection criteria include dual-current-bank programmability via ISETL/ISETH resistors, thermal performance in 4mm × 4mm QFN, buck/boost/buck-boost mode auto-selection, LED current matching <2.5%, and shutdown current of 6.5µA.
Technical Context
The LTC3452EUF#PBF employs a proprietary four-switch synchronous buck-boost architecture that dynamically selects between buck, boost, and buck-boost modes based on VIN vs. VOUT relationship and LED forward voltage requirements. It uses a single feedback loop controlled by the highest-VF LED among seven outputs to minimize regulated VOUT and maximize power efficiency.
Its internal transconductance main error amplifier drives the VC compensation node, while a dedicated safety error amplifier clamps VOUT at ~4.5V during open-LED faults. Forward current limiting (1600mA typical) and reverse current limiting (200mA typical) protect internal PMOS/NMOS switches, and soft-start ensures 650µs controlled output ramp-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports full Li-ion battery discharge curve without dropout or external LDO. |
| Main LED Output | 5 × 20mA - enables uniform backlighting for small LCD displays with <2.5% current matching. |
| Camera LED Output | 200mA continuous - sufficient for sustained torch mode or pulsed flash operation in camera modules. |
| Switching Frequency | 1MHz fixed - allows use of compact 4.7µH inductors and reduces EMI filtering burden. |
| Shutdown Current | 6.5µA - minimizes battery drain during device sleep states in portable applications. |
| Package Thermal Resistance | θJA = 40°C/W - enables reliable operation up to 85°C ambient with standard PCB copper pour. |
| LED Protection | Open/short detection - prevents VOUT runaway and safeguards LEDs and driver during fault conditions. |
Pinout & Package
20-lead (4mm × 4mm) thermally enhanced QFN package with exposed pad (Pin 21) soldered to PCB ground for optimal thermal dissipation and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Signal input supply | 2.7V–5.5V logic and bias rail; bypassed with ≥2.2µF ceramic capacitor. |
| ENL (2) | Low-power bank enable/PWM input | Active-high PWM brightness control for MAIN LEDs; 10kHz–50kHz compatible. |
| ISETL (3) | Low-power current programming | Resistor-to-ground sets max per-LED current: ILEDLx|MAX = 256 × (0.8V / RISETL). |
| LEDL1–LEDL5 (4–8) | Low-dropout current sources | Each sinks up to 20mA; voltage drop ≤130mV at 20mA ensures minimal headroom loss. |
| GND (9,11) | Signal ground | Must be tied to PGND (18) and exposed pad (21) for stable reference and noise immunity. |
| LEDH1, LEDH2 (10,12) | High-power current sources | Each sinks up to 200mA; voltage drop ≤250mV at 100mA enables efficient flash operation. |
| ISETH (13) | High-power current programming | Resistor-to-ground sets max per-LED current: ILEDHx = 768 × (0.8V / RISETH). |
| ENH (14) | High-power bank enable | Active-high digital on/off control for camera flash; independent of ENL timing. |
| VC (15) | Error amplifier compensation | External 0.1µF capacitor sets dominant pole; critical for loop stability across all modes. |
| VOUT (16) | Buck-boost regulated output | Common anode rail for all LEDs; regulated up to 4.75V with ±2% accuracy over temperature. |
| SW1, SW2 (17,19) | Internal switch nodes | Connect external 4.7µH inductor; high-side/low-side switching nodes for synchronous operation. |
| PGND (18) | Power ground | High-current return path for inductor and switches; must be low-inductance connection to GND. |
| PVIN (20) | Power input supply | Parallel-connected to VIN (1); separates high-current PVIN path from signal VIN routing. |
| Exposed Pad (21) | Thermal & electrical ground | Must be soldered to PCB ground plane; provides primary thermal conduction path (θJA = 40°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck-boost topology | Auto-selects buck/boost/buck-boost mode to maintain ≥85% efficiency across 2.7V–4.2V Li-ion range. |
| Dual independent current banks | MAIN (5×20mA) and CAMERA (2×100mA or 1×200mA) driven from shared VOUT with separate ISET/EN controls. |
| LED current matching | <2.5% mismatch across all five MAIN LEDs and <6% across two CAMERA LEDs at rated load. |
| Integrated protection | Undervoltage lockout (1.6–2.3V), overtemperature shutdown (130°C), forward/reverse current limiting, and open-LED safety clamp. |
| Exponential brightness control | ENL PWM duty cycle maps to 7 binary steps (1/128 to 128/128 × IMAXL) for perceptually linear dimming. |
Applications
| Cell Phone Display Backlight | Digital Camera Flash |
|---|---|
Use Scenario: Driving five parallel white LEDs for main LCD backlight in smartphones with single-cell Li-ion power. IC Role / Device Role / Timing Role: Synchronous buck-boost regulator providing regulated VOUT and precision current sourcing for MAIN LED bank. Use Value: Maintains constant brightness across full battery discharge (2.7V–4.2V) with ≥85% efficiency and <2.5% LED current mismatch. | Use Scenario: Powering dual high-intensity white LEDs for still-image capture flash in compact digital cameras. IC Role / Device Role / Timing Role: High-current LED driver with independent ENH control enabling precise flash duration and intensity modulation. Use Value: Delivers 200mA continuous torch mode or pulsed flash with 250mV dropout at 100mA, minimizing thermal stress on LEDs. |
| PDA Main Display | Portable Media Player UI Lighting |
Use Scenario: Illuminating monochrome or color TFT displays in PDAs requiring low-noise, space-constrained backlight solutions. IC Role / Device Role / Timing Role: Dual-bank LED driver supporting MAIN display LEDs while reserving CAMERA bank for auxiliary lighting or status indicators. Use Value: 1MHz switching frequency enables ultra-compact 4.7µH inductor and low-profile 4mm × 4mm QFN footprint ideal for thin form factors. | Use Scenario: Providing adjustable UI backlighting and status illumination in handheld media players with battery life sensitivity. IC Role / Device Role / Timing Role: Exponential PWM brightness controller using ENL input to deliver perceptually linear dimming from 0–100% intensity. Use Value: Eliminates need for external microcontroller-based dimming algorithms; achieves smooth, flicker-free dimming with simple 10–50kHz PWM signal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DRVR | Single-bank 30mA × 6-channel boost driver; no buck-boost topology; lower max output current (180mA). | Best suited for display-only applications without flash capability; lacks independent MAIN/CAMERA control. | Select when only MAIN backlight is required and board space permits larger inductor due to 1.2MHz switching frequency. |
| MAX8630YETE+ | 6-channel 25mA boost driver with integrated I²C interface; no high-current flash bank; 2.5V–5.5V input. | Designed for software-configurable multi-display systems; requires host MCU communication for brightness control. | Choose when system-level brightness calibration, sequencing, or diagnostics via I²C are required over hardware PWM simplicity. |
Compared with TPS61165DRVR and MAX8630YETE+, the LTC3452EUF#PBF uniquely combines MAIN/CAMERA dual-current banks, buck-boost topology for wide-input efficiency, and hardware-based exponential PWM dimming-making it optimal for cost-sensitive, MCU-light portable devices needing both display and flash functionality in one IC.
Availability
LTC3452EUF#PBF is available at Aetrix Electronics and suitable for cell phones, digital cameras, PDAs, and portable media players requiring stable component supply, consistent thermal performance, and long-term production continuity.
Supply support for LTC3452EUF#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3452EUF#PBF belongs to Linear's legacy LED driver product line, specifically engineered for space-constrained, battery-powered portable electronics demanding high-efficiency dual-bank LED control with minimal external components.
FAQ
What is the maximum continuous output current capability of the LTC3452EUF#PBF?
The LTC3452EUF#PBF supports up to 425mA total continuous output current. This is distributed across its dual banks: up to 5 × 20mA (100mA) for the MAIN display LEDs and up to 200mA for the CAMERA flash bank. The 425mA limit reflects the combined capability of the internal synchronous switches and thermal design of the 4mm × 4mm QFN package under typical PCB layout conditions.
How does the LTC3452EUF#PBF achieve high efficiency across the full Li-ion battery range?
The LTC3452EUF#PBF achieves ≥85% efficiency from 2.7V to 4.2V by dynamically selecting buck, boost, or buck-boost operating mode based on real-time comparison of input voltage and LED forward voltage requirements. Its proprietary feedback architecture regulates VOUT to the minimum level needed for the highest-VF LED, reducing conduction losses. Combined with low-RDS(ON) synchronous switches (205–210mΩ) and 1MHz fixed-frequency operation, this minimizes both switching and conduction losses.
Can the LTC3452EUF#PBF drive more than five MAIN LEDs or a single high-power LED?
Yes - unused LEDLx pins (4–8) can be paralleled to increase per-string current, and LEDH1/LEDH2 (10,12) may be connected together to source up to 400mA for a single high-power LED. The LTC3452EUF#PBF datasheet explicitly confirms this configuration for applications like LumiLED driving. However, total output current must remain within the 425mA continuous limit, and thermal design must accommodate increased power dissipation at the exposed pad.
What protection features are integrated into the LTC3452EUF#PBF?
The LTC3452EUF#PBF integrates undervoltage lockout (UVLO), overtemperature shutdown (130°C trip with 11°C hysteresis), open/shorted LED detection, forward current limiting (1600mA typical), reverse current limiting (200mA typical), and a safety error amplifier that clamps VOUT at ~4.5V during open-circuit faults. These features ensure robust operation in portable devices where battery voltage fluctuation, thermal stress, and LED failure modes are common.
Is the LTC3452EUF#PBF pin-compatible with other members of the LTC345x family?
No - the LTC3452EUF#PBF is not pin-compatible with LTC3451 or LTC3453. While sharing functional similarities, each variant has distinct pin assignments (e.g., LTC3451 uses different EN/ISETH configurations and lacks LEDH2), different current capabilities, and unique internal routing. The LTC3452EUF#PBF's 20-pin QFN layout with specific placement of SW1/SW2, VC, and dual ISET pins is unique to this part number and must be laid out accordingly.
LTC3452EUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN 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:
- 7
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 4.5V
- Current - Output / Channel:
- 25mA, 150mA
- Frequency:
- 1MHz
- Dimming:
- -
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
LTC3452EUF#PBF FAQ
1.How can I place an order for LTC3452EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3452EUF#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 LTC3452EUF#PBF reliable?
The price and inventory of LTC3452EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3452EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3452EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3452EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3452EUF#PBF?
LTC3452EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3452EUF#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 LTC3452EUF#PBF?
For technical support, including LTC3452EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3452EUF#PBF requirements.
6.How does Aetrix verify that LTC3452EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3452EUF#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 LTC3452EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3452EUF#PBF?
All LTC3452EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3452EUF#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 LTC3452EUF#PBF part is unused and in its original packaging.
Return procedure for LTC3452EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3452EUF#PBF Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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