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Analog Devices Inc. LTC3452EUF#TRPBF
- Part No.:
- LTC3452EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3452EUF#TRPBF.pdf
- Description:
- IC LED DRV RGLTR /150MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,311
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Product details
Overview
LTC3452EUF#TRPBF 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 in the MAIN display bank and up to 200mA in the CAMERA flash bank, operates from 2.7V–5.5V input, achieves ≥85% efficiency across Li-Ion battery range, and integrates independent PWM brightness control and open/shorted LED protection.
For engineers reviewing the LTC3452EUF#TRPBF datasheet, LTC3452EUF#TRPBF pinout, LTC3452EUF#TRPBF application, or LTC3452EUF#TRPBF equivalent, key selection criteria include its 1MHz constant-frequency operation, thermally enhanced 20-lead QFN package, dual enable architecture (ENL/ENH), ISETL/ISETH current programming, and integrated overtemperature and UVLO protection - all critical for compact, high-efficiency LED backlight and flash designs.
Technical Context
The LTC3452EUF#TRPBF employs a proprietary four-switch buck-boost topology that dynamically selects between buck, boost, or buck-boost mode based on VIN vs. VOUT and the highest forward voltage LED in either bank. Its main error amplifier closes the regulation loop on the LED requiring the largest forward drop at programmed current, minimizing VOUT and maximizing power efficiency.
It features dual independent current-setting amplifiers (256× gain for MAIN bank, 768× for CAMERA bank), exponential PWM brightness control only on ENL (for MAIN), hard-wired on/off control via ENH (for CAMERA), and safety error amplifier takeover at ~4.5V to prevent VOUT runaway during LED open-circuit faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports full Li-Ion battery discharge curve without external LDO or pre-regulator. |
| Main Bank Output Current | 5 × 20mA max - drives five parallel white LEDs for display backlight with <2.5% matching. |
| Camera Bank Output Current | 200mA continuous (or 300mA pulsed) - enables high-intensity flash illumination with independent ENH control. |
| Switching Frequency | 1MHz (±10%) - allows use of small 4.7µH inductor and reduces EMI filtering burden. |
| Shutdown Current | 6.5µA typical - minimizes battery drain in standby mode for portable applications. |
| Package | 20-lead (4mm × 4mm) QFN, 0.75mm height - thermally enhanced with exposed pad soldered to PCB ground. |
| Protection Features | Open/shorted LED detection, overtemperature shutdown (130°C), undervoltage lockout (~2.0V rising), forward/reverse current limiting. |
Pinout & Package
20-lead (4mm × 4mm) plastic QFN package with exposed thermal pad (Pin 21 = GND). Pin pitch: 0.5mm. Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Signal input supply | 2.7V–5.5V logic and gate drive supply; bypass with ≥2.2µF ceramic to GND. |
| ENL (2) | MAIN bank enable & PWM input | Active-high; accepts 10–50kHz PWM for exponential brightness control of 5×20mA bank. |
| ISETL (3) | MAIN bank current reference | Resistor-to-GND sets max per-LED current: ILEDLx|MAX = 256 × (0.8V / RISETL). |
| LEDL1–LEDL5 (4–8) | MAIN bank current sinks | Low-dropout (130mV @ 20mA) current sources; unused pins connect to VOUT. |
| GND (9, 11) | Signal ground | Must tie to PGND (18) and exposed pad (21); forms analog reference for error amps. |
| LEDH1, LEDH2 (10, 12) | CAMERA bank current sinks | Low-dropout (250mV @ 100mA) current sources; unused pins connect to VOUT. |
| ISETH (13) | CAMERA bank current reference | Resistor-to-GND sets max per-LED current: ILEDHx = 768 × (0.8V / RISETH). |
| ENH (14) | CAMERA bank enable | Active-high digital on/off control; no PWM support - intended for flash strobe timing. |
| VC (15) | Error amplifier compensation | Internal transconductance amp output; requires ≥0.1µF ceramic capacitor to GND for loop stability. |
| VOUT (16) | Buck-boost regulated output | Common rail for all LEDs; bypass with ≥4.7µF ceramic capacitor to GND. |
| SW2 (17) | Switch node (C/D) | Connects to one end of external 4.7µH inductor; internal NMOS C / PMOS D switching node. |
| PGND (18) | Power ground | High-current return path for switches; must tie to GND (9, 11) and exposed pad (21). |
| SW1 (19) | Switch node (A/B) | Connects to other end of external 4.7µH inductor; internal PMOS A / NMOS B switching node. |
| PVIN (20) | Power input supply | High-current VIN path; must be shorted to VIN (Pin 1) on PCB. |
| Exposed Pad (21) | Thermal & electrical ground | Internally connected to GND; must be soldered to large PCB copper area for θJA = 40°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LED banks | MAIN (5×20mA) and CAMERA (2×100mA or 1×200mA) driven from single inductor and VOUT rail. |
| Exponential PWM brightness control | ENL pin implements 7-step binary exponential scaling (1/128× to 128/128× IMAXL) for perceptually linear dimming. |
| Intelligent VOUT regulation | Regulates only to the highest-VF LED's forward voltage, minimizing dropout loss and maximizing system efficiency. |
| Integrated safety monitoring | Safety error amp clamps VOUT at ~4.5V if any LED opens, preventing destructive overvoltage on remaining LEDs. |
| Robust fault protection | Includes forward current limit (1600mA), reverse current limit (200mA), UVLO, and overtemperature shutdown (130°C). |
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 battery. IC Role / Device Role / Timing Role: Synchronous buck-boost LED driver providing regulated current and dynamic VOUT adjustment based on LED VF. Use Value: Enables >85% efficiency across full 2.7V–4.2V battery range while maintaining tight current matching (<2.5%) and low-profile 4mm × 4mm footprint. | Use Scenario: Delivering 200mA pulsed current to single high-brightness LED for camera flash in compact digital cameras. IC Role / Device Role / Timing Role: High-current LED current source controlled by dedicated ENH pin for precise flash duration timing. Use Value: Supports reliable 200mA torch mode and higher-pulse flash operation with built-in overtemperature and open-LED protection. |
| PDA Main Screen Illumination | Portable Media Player UI Lighting |
Use Scenario: Powering monochrome or color TFT backlight in PDAs where space and battery life are constrained. IC Role / Device Role / Timing Role: Dual-bank driver enabling simultaneous MAIN backlight and status indicator control via separate ENL/ENH signals. Use Value: Eliminates need for separate boost converters; reduces BOM count and PCB area while supporting smooth PWM dimming. | Use Scenario: Illuminating front-panel buttons and OLED segments in portable audio/video players. IC Role / Device Role / Timing Role: Low-noise, constant-frequency (1MHz) LED driver minimizing interference with sensitive audio circuitry. Use Value: Delivers clean 20mA per segment with minimal conducted EMI due to synchronous switching and integrated soft-start. |
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 boost driver; no dual-bank architecture or CAMERA flash capability; 1.2MHz switching. | Only suitable for display backlight - cannot replace LTC3452EUF#TRPBF in flash-enabled designs. | Select only when flash functionality is unnecessary and board space allows separate flash IC. |
| MAX16822AETG+ | Linear LED driver (not switching); 4-channel, 30mA/channel; no buck-boost topology or high-current flash mode. | Lower efficiency, higher thermal load; limited to low-power indicator/backlight use cases. | Choose only for ultra-low-noise applications where efficiency and flash capability are secondary. |
Compared with TPS61165DRVR and MAX16822AETG+, the LTC3452EUF#TRPBF uniquely integrates MAIN + CAMERA dual-bank driving, 1MHz buck-boost conversion, and independent ENL/ENH control - making it the only direct solution for space-constrained portable devices requiring both display backlight and camera flash from a single IC.
Availability
LTC3452EUF#TRPBF is available at Aetrix Electronics and suitable for cell phone display backlight, digital camera flash, PDA illumination, portable media player UI lighting, and handheld medical device indicator applications requiring stable component supply and long-term production continuity.
Supply support for LTC3452EUF#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 precision instrumentation, communications, automotive, and industrial markets.
The LTC3452 product line was designed specifically for high-efficiency, dual-mode white LED driving in battery-powered portable electronics - emphasizing compact size, thermal robustness, and seamless integration of MAIN backlight and CAMERA flash functions.
FAQ
What is the maximum continuous output current capability of the LTC3452EUF#TRPBF?
The LTC3452EUF#TRPBF supports up to 425mA total continuous output current. This is distributed as 5 × 20mA (100mA) in the MAIN bank and up to 200mA in the CAMERA bank. The datasheet specifies 200mA continuous for LEDH1/LEDH2, with 300mA possible for single-LED operation under pulsed conditions - all within safe thermal limits when the exposed pad is properly soldered.
How does the LTC3452EUF#TRPBF regulate VOUT to maximize LED efficiency?
The LTC3452EUF#TRPBF monitors the forward voltage of all seven LED outputs and regulates VOUT only to the highest required VF at the programmed current. This "minimum sufficient VOUT" strategy minimizes dropout across the current sources, reducing power loss and improving overall efficiency - especially critical across the varying Li-Ion battery voltage range.
Can the LTC3452EUF#TRPBF drive more than five MAIN LEDs or more than two CAMERA LEDs?
Yes - multiple LEDLx or LEDHx pins can be paralleled to increase per-string current. For example, connecting LEDL1–LEDL5 together yields up to 100mA for a single high-brightness LED, and paralleling LEDH1+LEDH2 supports up to 200mA. The LTC3452EUF#TRPBF's current sources maintain matching even when paralleled, provided layout symmetry and thermal coupling are maintained.
What is the purpose of the VC pin on the LTC3452EUF#TRPBF, and what capacitor value is recommended?
The VC pin is the output of the main error amplifier and serves as the control node for the buck-boost regulation loop. A capacitor from VC to GND sets the dominant pole for loop stability. The datasheet recommends ≥0.1µF ceramic capacitance; typical designs use 0.1µF to 0.22µF. Lower values risk instability in boost mode; larger values reduce bandwidth and transient response speed.
Does the LTC3452EUF#TRPBF support analog brightness control, or is it PWM-only?
The LTC3452EUF#TRPBF supports both methods: PWM brightness control is implemented natively on the ENL pin for the MAIN bank (exponential scaling), while analog control is possible by injecting a variable voltage or current into the ISETL or ISETH pins - for example, using a DAC or potentiometer as shown in the Applications Information section of the datasheet.
LTC3452EUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN 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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3452EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3452EUF#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 LTC3452EUF#TRPBF reliable?
The price and inventory of LTC3452EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3452EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3452EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3452EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3452EUF#TRPBF?
LTC3452EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3452EUF#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 LTC3452EUF#TRPBF?
For technical support, including LTC3452EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3452EUF#TRPBF requirements.
6.How does Aetrix verify that LTC3452EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3452EUF#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 LTC3452EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3452EUF#TRPBF?
All LTC3452EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3452EUF#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 LTC3452EUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3452EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3452EUF#TRPBF Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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CL2N8-G
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