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Analog Devices Inc. LTC3545EUD#TRPBF
- Part No.:
- LTC3545EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3545EUD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 800MA TRPL 16QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3545EUD#TRPBF from Analog Devices (formerly Linear Technology) is a triple-channel monolithic synchronous step-down DC/DC regulator IC designed for single-cell Li-ion battery-powered systems. It delivers three independent 800mA outputs with 2.25MHz fixed-frequency operation, 0.6V feedback reference, and selectable low-ripple pulse-skip or high-efficiency Burst Mode™ operation - enabling compact power delivery in space-constrained portable electronics.
For engineers reviewing the LTC3545EUD#TRPBF datasheet, LTC3545EUD#TRPBF pinout, LTC3545EUD#TRPBF application, or LTC3545EUD#TRPBF equivalent, key selection criteria include input voltage range (2.25V–5.5V), per-channel PGOOD monitoring, external clock synchronization capability (1MHz–3MHz), and thermal performance in 3mm × 3mm QFN with exposed pad.
Technical Context
The LTC3545EUD#TRPBF implements constant-frequency current-mode control across three independent buck regulators, each with internal P-channel and N-channel synchronous MOSFETs. Its architecture supports independent RUNx enable inputs and dedicated PGOODx open-drain indicators for precise power-on sequencing in multi-rail systems.
It operates in either pulse-skip mode (low output ripple, higher quiescent current) or Burst Mode™ (58μA IQ, higher light-load efficiency), selected via the SYNC/MODE pin. The 0.6V reference enables output voltages as low as 0.6V, and the 2.25MHz switching frequency allows use of small 1.5μH inductors and ceramic capacitors.
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) without pre-regulation. |
| Output Current per Channel | 800mA - sufficient for core logic, memory, and I/O rails in smartphones and digital cameras. |
| Switching Frequency | 2.25MHz (internal) or 1MHz–3MHz (externally synchronized) - enables <3mm inductor height and reduces EMI fundamental frequency. |
| Feedback Reference Voltage | 0.6V ±12mV - allows precise low-voltage regulation (e.g., 1.2V, 1.5V, 1.8V) using standard resistor dividers. |
| Quiescent Current (Burst Mode) | 58μA - extends battery runtime during standby/sleep states in always-on portable devices. |
| Efficiency (Typical) | Up to 95% at full load - minimizes thermal stress and PCB area in thermally constrained handheld enclosures. |
| Power Good Threshold | ±7.5% deviation from VFB - provides reliable rail validation for FPGA/CPU power sequencing with margin. |
Pinout & Package
Package: 16-lead 3mm × 3mm plastic QFN with exposed thermal pad (Pin 17 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1, SW2, SW3 (Pins 1, 5, 8) | Switch node connections | Direct interface to external inductors; must be routed with short, low-inductance paths to minimize switching noise and EMI. |
| PGOOD1, PGOOD2, PGOOD3 (Pins 2, 4, 9) | Open-drain power-good indicators | Enable hardware-controlled sequencing - e.g., assert PGOOD1 before enabling RUN2 to ensure stable VOUT1 prior to powering downstream rails. |
| RUN1, RUN2, RUN3 (Pins 14, 3, 10) | Independent regulator enable inputs | Logic-high (>1V) activates corresponding channel; allows dynamic power gating per subsystem (e.g., disable camera ISP rail when idle). |
| VFB1, VFB2, VFB3 (Pins 13, 12, 11) | Feedback inputs | Connect to resistor divider from output; 0.6V reference sets VOUT = 0.6V × (1 + R1/R2); supports remote sensing for improved load regulation. |
| VIN (Pin 15), PVIN (Pin 7), GNDA (Pin 16), PGND (Pin 6) | Separate analog/digital and power path supplies/grounds | GNDA/PVIN decoupling isolates control circuitry noise from high-current switch paths - critical for stability in multi-output configurations. |
| SYNC/MODE (Pin 9) | Mode select & external sync input | Pulled low → Burst Mode™; pulled high → pulse-skip mode; driven by 1–3MHz clock → synchronized PWM operation for EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Triple 800mA synchronous buck channels | Eliminates need for three discrete converters - reduces BOM count, layout area, and design validation effort in multi-rail applications. |
| 2.25MHz constant-frequency operation | Enables use of 1.5μH inductors (e.g., Würth WE-TPC 744031) and 10μF ceramic output caps - achieves <10mm² per channel footprint. |
| Low-ripple Burst Mode™ (≤20mVP-P) | Maintains clean supply for noise-sensitive analog/RF sections (e.g., camera sensor ADCs) while delivering 58μA IQ for >1-week battery standby. |
| Independent RUNx and PGOODx pins | Supports flexible power-up/down sequencing without external logic - simplifies compliance with processor/fPGA power requirements (e.g., VDDIO before VDDCORE). |
| 0.6V feedback reference with ±2% tolerance | Permits accurate 1.2V/1.5V/1.8V generation using standard 1% resistors - avoids costly precision dividers or external references. |
Applications
| Smartphones | Wireless Modems |
|---|---|
Use Scenario: Powering application processor cores, memory interfaces, and baseband ICs from a single Li-ion cell. IC Role / Device Role / Timing Role: Triple-output PMIC providing independently sequenced, low-noise 1.2V (core), 1.5V (GPU), and 1.8V (I/O) rails. Use Value: Enables compact, thermally efficient power architecture with no external diodes or timing controllers - reducing bill-of-materials cost by ~$0.35 per unit. | Use Scenario: Supplying RF transceiver, baseband processor, and USB PHY in LTE/5G CPE modems. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 1.1V (RF LNA), 1.8V (baseband), and 3.3V (USB) from 3.6V nominal battery. Use Value: Synchronized 2.25MHz operation minimizes beat frequencies with cellular bands; Burst Mode™ extends battery life during idle data sessions. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Powering CMOS image sensor, ISP, and LCD driver in compact point-and-shoot cameras. IC Role / Device Role / Timing Role: High-efficiency triple regulator generating 1.2V (sensor digital), 1.8V (ISP), and 2.8V (LCD backlight driver) with fast transient response. Use Value: 850–1100μs soft-start prevents mechanical shutter jitter during power-up; PGOOD sequencing ensures sensor initialization completes before ISP activation. | Use Scenario: Providing isolated, low-noise rails for precision ADCs, microcontrollers, and display drivers in handheld test equipment. IC Role / Device Role / Timing Role: Central power management IC delivering 3.3V (MCU), 2.5V (ADC reference), and 1.8V (digital logic) with tight load regulation (<0.5%). Use Value: 0.6V reference and ±7.5% PGOOD threshold support metrology-grade accuracy; QFN package enables conformal coating for field-deployable ruggedness. |
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 | Fixed 1.2V/1.5V/1.8V outputs; no adjustable feedback; lower max input (5.5V); 2.25MHz not supported. | Targeted at OMAP/ARM-based tablets; lacks independent RUN/PGOOD per channel. | Select only if fixed outputs match system needs and sequencing simplicity outweighs flexibility. |
| MAX8646ETE+ | Higher IQ (120μA in skip mode); 3MHz max sync; no Burst Mode™; 16-pin TQFN same footprint. | Better for high-frequency EMI-sensitive designs; less suitable for ultra-low-power battery standby. | Prefer when 3MHz synchronization is mandatory and >58μA IQ is acceptable for application duty cycle. |
Compared with TPS65023RSBR and MAX8646ETE+, the LTC3545EUD#TRPBF offers uniquely configurable outputs, true independent channel control, and industry-leading 58μA Burst Mode™ IQ - making it optimal for next-generation portable devices requiring both miniaturization and extended battery life.
Availability
LTC3545EUD#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 guaranteed RoHS-compliant sourcing.
Supply support for LTC3545EUD#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 and maintains its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification standards.
The LTC3545EUD#TRPBF belongs to Linear's high-density synchronous buck regulator product line, engineered specifically for battery-powered portable electronics demanding ultra-small footprints, multi-rail sequencing, and nanoscale quiescent current.
FAQ
What is the maximum junction temperature specification for the LTC3545EUD#TRPBF?
The LTC3545EUD#TRPBF has a maximum operating junction temperature of 125°C. Its thermal resistance θJA is 68°C/W in the 3mm × 3mm QFN package. To maintain reliability, the exposed pad (Pin 17) must be soldered to a PCB ground plane; failure to do so may cause TJ to exceed 125°C under full 800mA load per channel at 85°C ambient.
Can the LTC3545EUD#TRPBF operate with input voltage below 2.25V?
No - the LTC3545EUD#TRPBF has an absolute minimum input voltage of 2.25V per Absolute Maximum Ratings. Operation below this level risks undervoltage lockout activation (VUVLO = 1.8V to 2.25V) and unregulated output. For sub-2.25V battery applications, consider the LTC3545-1 variant with identical pinout but Burst Mode™ only, or evaluate boost-buck architectures.
How does the SYNC/MODE pin function on the LTC3545EUD#TRPBF?
On the LTC3545EUD#TRPBF, the SYNC/MODE pin (Pin 9) serves dual functions: pulled low (<0.3V) enables Burst Mode™; pulled high (>1V) enables pulse-skip mode; driven by a 1MHz–3MHz external clock synchronizes switching frequency to that source. This pin is absent on the LTC3545-1 variant, which defaults to Burst Mode™ only.
What is the recommended output capacitor ESR for stable operation of the LTC3545EUD#TRPBF?
The LTC3545EUD#TRPBF does not require output capacitor ESR for loop stability - its current-mode control architecture supports zero-ESR ceramic capacitors. Typical designs use 10μF X5R/X7R ceramics (e.g., 0805 or 1206 case) with ≤10mΩ ESR. Lower ESR reduces output ripple (ΔVOUT ≈ ΔIL × ESR + ΔIL/(8 × f × COUT)) and improves transient response.
Does the LTC3545EUD#TRPBF support forced continuous conduction mode (FCCM)?
No - the LTC3545EUD#TRPBF does not support forced continuous conduction mode. It operates exclusively in pulse-skip mode (for low ripple) or Burst Mode™ (for high light-load efficiency), both of which inherently enter discontinuous conduction mode at light loads. FCCM is unavailable; designers requiring CCM must select alternatives like the LTC3546 or TPS62130.
LTC3545EUD#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#TRPBF FAQ
1.How can I place an order for LTC3545EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3545EUD#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#TRPBF reliable?
The price and inventory of LTC3545EUD#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3545EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3545EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3545EUD#TRPBF?
LTC3545EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3545EUD#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#TRPBF?
For technical support, including LTC3545EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3545EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3545EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3545EUD#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3545EUD#TRPBF?
All LTC3545EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3545EUD#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3545EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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