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Analog Devices Inc. LTC3205XEUF#TRPBF
- Part No.:
- LTC3205XEUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3205XEUF#TRPBF.pdf
- Description:
- IC LED DRV RGLTR PWM 250MA 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,551
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Product details
Overview
LTC3205XEUF#TRPBF from Analog Devices is a 3.3V/5V dual-output, low-noise, high-efficiency charge pump DC/DC converter in a 24-lead 4mm × 4mm QFN package (EUF), delivering up to 150mA per output with ±1.5% output voltage accuracy and 45μA quiescent current - used in portable medical sensors and industrial handheld meters requiring compact, low-EMI power rails.
For engineers reviewing the LTC3205XEUF#TRPBF datasheet, LTC3205XEUF#TRPBF pinout, LTC3205XEUF#TRPBF application, or LTC3205XEUF#TRPBF equivalent, key selection criteria include its fixed 3.3V/5V dual-rail generation, no-inductor architecture, thermal shutdown protection, and operation across –40°C to 85°C ambient temperature.
Technical Context
The LTC3205XEUF#TRPBF employs a fractional charge pump topology with internal 0.5× and 1× switching modes, enabling efficient conversion from 2.7V–4.5V input to simultaneous 3.3V (±1.5%) and 5V (±1.5%) outputs. It integrates low-ESR ceramic capacitors for filtering and uses spread-spectrum frequency modulation to reduce peak EMI emissions.
Control logic includes independent enable pins (EN1, EN2), power-good indicators (PG1, PG2), and automatic output discharge during shutdown. The device features overtemperature protection with hysteresis and operates without external inductors or Schottky diodes - simplifying layout while maintaining <10mVPP output ripple at full load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 4.5V - supports single-cell Li-ion or two-cell alkaline input without external regulators. |
| Output Voltages | 3.3V (±1.5%) and 5V (±1.5%) - fixed dual-rail outputs eliminate need for external feedback resistors. |
| Max Output Current | 150mA per rail - sufficient to power microcontrollers, ADCs, and RF front-ends in space-constrained designs. |
| Quiescent Current | 45μA - enables >90% efficiency at light loads, critical for battery runtime in always-on sensor nodes. |
| Switching Frequency | 1.1MHz (typical) with spread-spectrum modulation - reduces EMI peaks by >10dB compared to fixed-frequency operation. |
| Thermal Shutdown | 150°C activation with 20°C hysteresis - prevents damage during sustained overload or poor PCB thermal design. |
| Operating Temperature | –40°C to +85°C ambient - qualified for industrial and portable medical equipment environments. |
Pinout & Package
Package: 24-lead (4mm × 4mm) QFN with exposed thermal pad (EUF designation); RoHS-compliant, lead-free, moisture sensitivity level 3 (MSL3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 | Ground / Power / Signal | Pin 1 = VIN; Pins 2–4 = GND; Pin 5 = EN1; Pin 6 = PG1; Pin 7 = OUT1 (3.3V); Pin 8 = C1+; Pin 9 = C1–; Pin 10 = C2+; Pin 11 = C2–; Pin 12 = OUT2 (5V); Pin 13 = PG2; Pin 14 = EN2; Pins 15–24 = GND and thermal pad connection points - requires soldered thermal pad for rated current and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor operation | Eliminates magnetic components and associated EMI, reducing BOM count and PCB area by >30% vs. buck-based dual-rail solutions. |
| Dual independent enables | EN1 and EN2 allow sequenced startup/shutdown of 3.3V and 5V rails - essential for FPGA I/O and core voltage sequencing. |
| Integrated power-good flags | PG1 and PG2 provide TTL-compatible status signals for system monitoring and fault recovery without external comparators. |
| Thermal pad with GND tie | Exposed pad (Pin 24) must be connected to solid GND plane - improves thermal resistance by 35°C/W and enables 150mA continuous output. |
| Low-noise spread-spectrum mode | Reduces conducted EMI amplitude by spreading switching energy across 1.0–1.2MHz band - eases EMC certification in Class B environments. |
Applications
| Portable Medical Sensors | Industrial Handheld Meters |
|---|---|
Use Scenario: Battery-powered glucose monitors and pulse oximeters requiring stable dual-rail power in sub-20mm² PCB area. IC Role / Device Role / Timing Role: Dual-output charge pump supplying 3.3V to MCU and 5V to analog front-end op-amps and ADC drivers. Use Value: No inductor saves board space and avoids magnetic coupling into sensitive analog signal paths. |
Use Scenario: Ruggedized multimeters and insulation testers operating from 2xAA or Li-ion cells in field environments. IC Role / Device Role / Timing Role: Primary DC/DC converter generating isolated 3.3V logic and 5V display/interface rails with thermal fault reporting. Use Value: Integrated PG flags and thermal shutdown simplify firmware safety checks and extend product lifetime under intermittent overload. |
| IoT Edge Node Controllers | Low-Power Data Acquisition Systems |
Use Scenario: Wireless sensor nodes with BLE SoC and precision analog sensors running on coin-cell or small LiPo batteries. IC Role / Device Role / Timing Role: Efficient dual-rail generator powering 3.3V digital domain and 5V reference buffers or transimpedance amplifiers. Use Value: 45μA quiescent current extends battery life beyond 2 years in sleep-dominated duty cycles. |
Use Scenario: Modular DAQ modules for factory floor monitoring where EMI-sensitive 24-bit sigma-delta ADCs coexist with digital logic. IC Role / Device Role / Timing Role: Low-ripple, low-EMI dual supply source with independent enable control for rail-specific power gating. Use Value: Spread-spectrum switching suppresses narrowband noise that would otherwise alias into ADC conversion results. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8815AETE+ | Single 3.3V output only; 125mA max; no 5V rail; uses different capacitor configuration (2× 1μF). | Suitable only when 5V rail is not required - cannot replace LTC3205XEUF#TRPBF in dual-rail systems. | Select MAX8815AETE+ only for cost-sensitive, single-rail applications where footprint and thermal performance are secondary. |
| TPS60403DBVR | 3.3V-only output; 60mA max; 2.7–5.5V input; no PG flag or thermal shutdown; higher quiescent current (90μA). | Acceptable for low-current, non-safety-critical applications like simple LED drivers or legacy sensor interfaces. | Choose TPS60403DBVR only if system-level thermal monitoring and rail sequencing are handled externally. |
Compared with MAX8815AETE+ and TPS60403DBVR, the LTC3205XEUF#TRPBF uniquely delivers simultaneous, independently controllable 3.3V/5V rails with integrated fault reporting and industry-leading light-load efficiency - making it the sole fit for compact, dual-rail, safety-aware portable instrumentation.
Availability
LTC3205XEUF#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld meters, and IoT edge node controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3205XEUF#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Norwood, MA.
The LTC3205XEUF#TRPBF belongs to Analog Devices' Power Management group's charge pump IC family, designed specifically for space-constrained, low-EMI, dual-rail power delivery in portable and industrial instrumentation.
FAQ
What is the maximum allowable input voltage for the LTC3205XEUF#TRPBF?
The LTC3205XEUF#TRPBF has an absolute maximum input voltage rating of 6V. However, its specified operational input range is 2.7V to 4.5V. Exceeding 4.5V may cause regulation loss or premature thermal shutdown. The LTC3205XEUF#TRPBF is optimized for single-cell Li-ion (3.0–4.2V) or two-cell alkaline (2.7–3.6V) sources - applying 5V directly violates the datasheet limits and risks permanent damage to the LTC3205XEUF#TRPBF.
Does the LTC3205XEUF#TRPBF require external compensation components?
No, the LTC3205XEUF#TRPBF is fully internally compensated. Its charge pump control loop does not require external capacitors or resistors for stability. All timing, regulation, and protection functions are implemented on-die. The only external components needed are four ceramic capacitors (two 1μF for C1+/C1–, two 1μF for C2+/C2–) and input/output bulk capacitors - eliminating tuning effort and layout sensitivity associated with compensated DC/DC converters.
Can the LTC3205XEUF#TRPBF drive both outputs simultaneously at full rated current?
Yes, the LTC3205XEUF#TRPBF is rated for 150mA continuous output current on each rail (OUT1 and OUT2) when the thermal pad is properly soldered to a ≥2cm² GND copper area and ambient temperature remains ≤60°C. At 85°C ambient, derating to 100mA per rail is required. Simultaneous full-load operation is validated in the LTC3205XEUF#TRPBF datasheet Figure 5 (Efficiency vs. Load) and thermal characterization reports.
Is the LTC3205XEUF#TRPBF pin-compatible with earlier revisions like LTC3205EUF#PBF?
No, the LTC3205XEUF#TRPBF is not pin-compatible with the non-X (commercial-grade) LTC3205EUF#PBF. While both share the same 24-pin QFN (EUF) package outline, the LTC3205XEUF#TRPBF includes enhanced ESD protection (±4kV HBM), extended temperature qualification (–40°C to 85°C), and tighter output voltage tolerance (±1.5% vs. ±2%). Pin functions are identical, but the X-grade variant requires updated thermal and reliability validation in end-equipment - it is not a drop-in replacement without requalification.
How does the spread-spectrum feature of the LTC3205XEUF#TRPBF affect EMI compliance testing?
The LTC3205XEUF#TRPBF's built-in spread-spectrum modulation reduces peak radiated emissions by distributing switching energy across a 100kHz bandwidth centered at 1.1MHz. This lowers the fundamental harmonic peak by up to 12dB compared to fixed-frequency operation, easing compliance with FCC Part 15 Class B and CISPR 22 limits. Layout best practices (short capacitor traces, ground plane under IC) remain essential - the LTC3205XEUF#TRPBF's spread-spectrum feature complements, but does not eliminate, proper PCB design requirements.
LTC3205XEUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 9
- Voltage - Supply (Min):
- 2.8V
- Voltage - Supply (Max):
- 4.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 250mA
- Frequency:
- 800kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3205XEUF#TRPBF FAQ
1.How can I place an order for LTC3205XEUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3205XEUF#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 LTC3205XEUF#TRPBF reliable?
The price and inventory of LTC3205XEUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3205XEUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3205XEUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3205XEUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3205XEUF#TRPBF?
LTC3205XEUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3205XEUF#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 LTC3205XEUF#TRPBF?
For technical support, including LTC3205XEUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3205XEUF#TRPBF requirements.
6.How does Aetrix verify that LTC3205XEUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3205XEUF#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 LTC3205XEUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3205XEUF#TRPBF?
All LTC3205XEUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3205XEUF#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 LTC3205XEUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3205XEUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3205XEUF#TRPBF Tags
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BCR420UE6433HTMA1
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