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Analog Devices Inc. LTC3545EUD-1#TRPBF
- Part No.:
- LTC3545EUD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3545EUD-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 800MA TRPL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,343
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Product details
Overview
LTC3545EUD-1#TRPBF from Analog Devices (formerly Linear Technology) is a triple-output, monolithic synchronous step-down DC/DC converter optimized for single-cell Li-ion battery-powered systems. It delivers three independent 800mA outputs with fixed 2.25MHz switching, Burst Mode™ operation only, and dedicated PGOOD pins for all three regulators. It supports 2.25V–5.5V input and enables low-voltage point-of-load regulation in space-constrained portable electronics.
For engineers reviewing the LTC3545EUD-1#TRPBF datasheet, LTC3545EUD-1#TRPBF pinout, LTC3545EUD-1#TRPBF application, or LTC3545EUD-1#TRPBF equivalent, key selection criteria include guaranteed Burst Mode-only operation, absence of SYNC/MODE functionality, third PGOOD pin, 0.6V feedback reference, and thermal performance in 3mm × 3mm QFN with exposed pad.
Technical Context
The LTC3545EUD-1#TRPBF implements a constant-frequency current-mode architecture with internal P-channel and N-channel synchronous MOSFETs per channel. Each regulator operates independently with separate RUNx enable inputs and dedicated PGOODx open-drain indicators-PGOOD3 replaces the SYNC/MODE pin found on the LTC3545 variant.
It features fixed 2.25MHz operation (non-synchronizable), 0.6V reference tolerance of ±1.3% over temperature, and soft-start with ~1ms VFB ramp. Quiescent current is 58μA in Burst Mode, and output voltage is set externally via resistive dividers tied to VFB1/VFB2/VFB3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports direct connection to single Li-ion battery (2.7V–4.2V typical discharge range). |
| Output Current per Channel | 800mA - sufficient for core logic, memory, and I/O rails in smartphones and digital cameras. |
| Switching Frequency | 2.25MHz (fixed) - enables use of small 1.5μH inductors and compact ceramic capacitors. |
| Feedback Reference Voltage | 0.6V ±1.3% - allows precise low-voltage outputs (e.g., 1.2V, 1.5V, 1.8V) with standard resistor ratios. |
| Quiescent Current | 58μA (Burst Mode) - ensures >85% efficiency at 1mA load, critical for standby power in portable devices. |
| Package | 16-lead 3mm × 3mm QFN with exposed thermal pad - provides θJA = 55°C/W for reliable thermal management at full load. |
| Power Good Threshold | ±7.5% deviation from VFB - ensures robust sequencing control with tight output voltage monitoring per rail. |
Pinout & Package
16-lead (3mm × 3mm) plastic QFN package with exposed GND pad (Pin 17), optimized for thermal dissipation and high-density PCB layouts. Pin 17 must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2, SW3 (Pins 1, 5, 8) | Switch node connections | Direct interface to external inductors; high dv/dt nodes requiring tight layout and Kelvin grounding. |
| PGOOD1, PGOOD2, PGOOD3 (Pins 2, 4, 9) | Open-drain power-good indicators | Enable sequenced power-up/down across three independent rails without external logic or timers. |
| RUN1, RUN2, RUN3 (Pins 14, 3, 10) | Independent regulator enable inputs | Logic-level control (1V threshold) allows flexible power-state management per channel. |
| VFB1, VFB2, VFB3 (Pins 13, 12, 11) | Feedback inputs | Accept resistive divider signals to set output voltages; high-impedance (80nA leakage) minimizes divider error. |
| VIN (Pin 15), PVIN (Pin 7), GNDA (Pin 16), PGND (Pin 6) | Separate analog/digital and power path supplies/returns | Isolates noise-sensitive control circuitry (VIN/GNDA) from high-current switch paths (PVIN/PGND) for stable regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ only operation | Guaranteed low-noise, high-efficiency light-load behavior (58μA IQ) without mode-selection complexity or risk of pulse-skipping instability. |
| Dedicated PGOOD3 pin | Eliminates need for external level-shifting or OR-ing logic when monitoring all three outputs during sequencing or fault detection. |
| Internal synchronous MOSFETs | Removes requirement for external Schottky diodes, reducing BOM count, board area, and conduction losses (RDS(ON) = 0.35Ω typ per FET). |
| 0.6V precision reference | Enables accurate low-voltage outputs (e.g., 1.2V @ 5% tolerance) using standard 1% resistors without trimming or calibration. |
| Current-mode control | Delivers fast transient response (<10μs recovery for 600mA load step) and inherent cycle-by-cycle current limiting for short-circuit protection. |
Applications
| Smartphones | Wireless Modems |
|---|---|
Use Scenario: Powering application processor cores, DDR memory, and camera ISP from a single Li-ion cell. IC Role / Device Role / Timing Role: Triple-output point-of-load regulator providing independent 1.2V, 1.5V, and 1.8V rails with coordinated power-good signaling. Use Value: Enables clean, sequenced startup and ultra-low standby current (58μA) without external supervisors or discrete regulators. | Use Scenario: Supplying RF transceiver, baseband SoC, and USB PHY in LTE/5G CPE modems. IC Role / Device Role / Timing Role: High-frequency (2.25MHz) buck converter delivering regulated rails while minimizing EMI-sensitive band interference. Use Value: Small 1.5μH inductors and ceramic caps reduce solution size by >40% vs lower-frequency alternatives. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Powering image sensor, DSP, and LCD bias in compact DSLR/mirrorless bodies. IC Role / Device Role / Timing Role: Triple synchronous buck managing dynamic load transients during burst capture and video streaming. Use Value: Current-mode architecture ensures <100mV output deviation during 600mA load steps, preserving image quality. | Use Scenario: Regulating microcontroller, ADC, and display drivers in handheld test equipment. IC Role / Device Role / Timing Role: Low-quiescent, thermally robust power manager operating reliably at 85°C ambient. Use Value: Exposed-pad QFN and 55°C/W θJA allow full 800mA/channel output without derating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | Triple 600mA outputs; 2.25MHz fixed frequency; integrated LDOs; no PGOOD3 pin - uses shared PGOOD for all channels. | Designed for OMAP3/DM365 processors; includes 1.8V/2.8V LDOs not present in LTC3545EUD-1#TRPBF. | Select when system requires mixed buck+LDO power tree and can accept shared PGOOD signaling. |
| RTQ2132B-QA | Triple 1A outputs; 2.5MHz fixed frequency; Burst Mode + forced PWM modes; PGOOD per channel; AEC-Q100 Grade 2. | Automotive-qualified; higher current rating and wider input range (2.5V–5.5V); larger 4mm × 4mm QFN package. | Select for automotive infotainment or ADAS where AEC-Q100 compliance and 1A per channel are required. |
Compared with TPS65023RSBR and RTQ2132B-QA, the LTC3545EUD-1#TRPBF offers superior light-load efficiency (58μA vs ≥80μA), smaller footprint (3mm × 3mm), and guaranteed Burst Mode-only operation-ideal for consumer portable designs prioritizing standby time and board area.
Availability
LTC3545EUD-1#TRPBF is available at Aetrix Electronics and suitable for smartphone power management, wireless modem subsystems, and portable instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3545EUD-1#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management ICs, serving industrial, automotive, communications, and consumer markets.
The LTC3545 family was designed specifically for high-density, multi-rail portable electronics requiring ultra-low quiescent current, precise voltage regulation, and seamless power sequencing-all within minimal PCB area.
FAQ
What is the key functional difference between LTC3545EUD-1#TRPBF and LTC3545EUD#TRPBF?
The LTC3545EUD-1#TRPBF replaces the SYNC/MODE pin (Pin 9) with a third PGOOD pin (PGOOD3), and operates exclusively in Burst Mode™-no pulse-skipping or external clock synchronization capability. In contrast, the LTC3545EUD#TRPBF retains SYNC/MODE for mode selection or external clock sync. This makes LTC3545EUD-1#TRPBF ideal for designs requiring deterministic low-IQ behavior without mode-control complexity.
Does LTC3545EUD-1#TRPBF support output voltages below 1.0V?
Yes. The LTC3545EUD-1#TRPBF uses a 0.6V feedback reference, enabling output voltages as low as 0.6V when configured with appropriate resistor dividers. For example, a 1:1 divider yields 1.2V; scaling R1/R2 further (e.g., R1 = 0Ω, R2 = ∞) is not valid, but 0.8V (R1/R2 = 0.33) and 0.9V (R1/R2 = 0.5) are achievable with standard 1% resistors and remain within specified reference accuracy and load regulation limits.
What is the maximum total output current supported by LTC3545EUD-1#TRPBF across all three channels?
Each channel of the LTC3545EUD-1#TRPBF is rated for 800mA continuous output. While simultaneous full-load operation on all three channels is electrically possible, thermal analysis shows junction temperature exceeds 125°C at 85°C ambient unless PCB copper area and airflow are significantly enhanced. Derating to ≤600mA per channel is recommended for sustained triple-channel operation above 60°C ambient.
Can LTC3545EUD-1#TRPBF be used with ceramic output capacitors?
Yes - the LTC3545EUD-1#TRPBF's current-mode control loop is inherently stable with zero-ESR ceramic capacitors. X5R or X7R dielectrics are recommended for output capacitance due to their stable voltage and temperature coefficients. Typical designs use 10μF ceramics per channel, enabling <20mVP-P ripple in Burst Mode and eliminating electrolytic capacitor aging concerns.
How does the RUN pin logic work on LTC3545EUD-1#TRPBF?
Each RUN pin (RUN1, RUN2, RUN3) enables its respective regulator when pulled above 1.0V (typical threshold). Below 0.3V, the regulator enters shutdown with <0.1μA supply current. RUN pins tolerate voltages up to VIN + 0.3V and exhibit ±1μA leakage. This allows direct interfacing with GPIOs, battery monitors, or discrete logic without level shifters - simplifying power-state control in multi-rail systems.
LTC3545EUD-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 3
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 800mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3545EUD-1#TRPBF FAQ
1.How can I place an order for LTC3545EUD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3545EUD-1#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 LTC3545EUD-1#TRPBF reliable?
The price and inventory of LTC3545EUD-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3545EUD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3545EUD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3545EUD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3545EUD-1#TRPBF?
LTC3545EUD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3545EUD-1#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 LTC3545EUD-1#TRPBF?
For technical support, including LTC3545EUD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3545EUD-1#TRPBF requirements.
6.How does Aetrix verify that LTC3545EUD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3545EUD-1#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 LTC3545EUD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3545EUD-1#TRPBF?
All LTC3545EUD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3545EUD-1#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 LTC3545EUD-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3545EUD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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