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Analog Devices Inc. LTC3545EUD#PBF
- Part No.:
- LTC3545EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3545EUD#PBF.pdf
- Description:
- IC REG BUCK ADJ 800MA TRPL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,670
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Product details
Overview
LTC3545EUD#PBF from Analog Devices (formerly Linear Technology) is a triple-channel, monolithic synchronous step-down DC/DC converter 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#PBF datasheet, LTC3545EUD#PBF pinout, LTC3545EUD#PBF application, or LTC3545EUD#PBF equivalent, key selection criteria include input voltage range (2.25V–5.5V), per-channel PGOOD signaling, SYNC/MODE pin functionality, thermal performance in 3mm × 3mm QFN, and compatibility with ceramic output capacitors for low-ripple point-of-load regulation.
Technical Context
The LTC3545EUD#PBF implements a constant-frequency, current-mode control architecture across three independent buck regulators, each with internal P-channel and N-channel synchronous MOSFETs. It supports external clock synchronization (1MHz–3MHz) and features separate RUNx enable inputs and open-drain PGOODx indicators for precise power-on sequencing.
Its Burst Mode™ operation achieves 58μA quiescent current per regulator while maintaining regulation, and the 0.6V reference enables output voltages as low as 0.6V. The device operates over –40°C to 125°C junction temperature, with RDS(ON) of 0.35Ω (P-FET) and 0.35Ω (N-FET) at 100mA, ensuring high efficiency across load ranges.
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 use of small 1.5μH inductors and reduces EMI filtering burden. |
| Feedback Reference Voltage | 0.6V ±12mV - allows precise programming of low-voltage rails (e.g., 1.2V, 1.5V, 1.8V) using standard resistor dividers. |
| Quiescent Current (Burst Mode) | 58μA per regulator - extends battery life in standby/sleep states without sacrificing wake-up response. |
| Efficiency (Typical) | Up to 95% at full load - minimizes thermal stress and PCB area in thermally constrained handheld designs. |
| Package | 16-lead 3mm × 3mm QFN with exposed pad - provides low θJA = 55°C/W for reliable operation at 125°C max junction temperature. |
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 | Drive external inductors; must be routed with short, low-inductance paths to minimize switching noise and voltage spikes. |
| RUN1, RUN2, RUN3 (Pins 14, 3, 10) | Independent enable inputs | Logic-high (>1V) activates corresponding regulator; allows flexible power sequencing and dynamic rail control. |
| PGOOD1, PGOOD2, PGOOD3 (Pins 2, 4, 9) | Open-drain power-good indicators | Assert low when output falls >7.5% below target - used for system reset, sequencing, or fault monitoring. |
| VFB1, VFB2, VFB3 (Pins 13, 12, 11) | Feedback inputs | Monitor output via resistive divider; 0.6V reference sets regulation point - supports remote sensing for improved load regulation. |
| VIN (Pin 15), PVIN (Pin 7), GNDA (Pin 16), PGND (Pin 6) | Power and ground domains | VIN powers control circuitry (Reg1); PVIN powers power stages (Reg2/Reg3); GNDA/PGND separation reduces noise coupling between analog and power paths. |
| SYNC/MODE (Pin 9) | Mode select & sync input | Pulled high → pulse-skip mode; pulled low → Burst Mode™; driven by external clock → synchronized pulse-skip at 1–3MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent 800mA buck regulators | Enables single-chip solution for multi-rail systems (e.g., core, I/O, memory) - eliminates need for three discrete converters and simplifies layout. |
| 2.25MHz constant-frequency operation | Permits use of 1.5μH inductors and 10μF ceramic output capacitors - reduces total BOM size and cost vs lower-frequency alternatives. |
| Low-ripple Burst Mode™ with 58μA IQ | Delivers <20mVP-P output ripple at light loads while achieving >85% efficiency at 1mA - critical for noise-sensitive RF and sensor subsystems. |
| 0.6V precision feedback reference | Supports accurate low-voltage outputs (e.g., 1.2V ±1%) with standard 1% resistors - eliminates need for external reference or trimming. |
| Independent RUN and PGOOD per channel | Allows hardware-controlled power sequencing (e.g., VDDIO before VDDCORE) and real-time rail health monitoring without external logic. |
Applications
| Smartphones | Wireless Modems |
|---|---|
Use Scenario: Powering application processor cores, DDR memory, and display interface rails from a single Li-ion cell. IC Role / Device Role / Timing Role: Triple-output PMIC providing sequenced, regulated 1.2V (core), 1.5V (memory), and 1.8V (I/O) supplies with fast transient response. Use Value: Reduces component count by replacing three discrete buck converters; 2.25MHz operation enables ultra-compact 3mm × 3mm footprint on dense mobile PCBs. | Use Scenario: Supplying baseband processor, RF transceiver, and USB PHY in LTE/5G CPE modems. IC Role / Device Role / Timing Role: Independent regulation of digital, analog, and interface supplies with programmable startup timing via RUNx pins. Use Value: PGOOD signals coordinate boot sequence with host controller; Burst Mode™ extends battery runtime during idle periods without compromising wake latency. |
| Digital Still Cameras | Portable Instruments |
Use Scenario: Delivering clean, low-noise power to image sensor, ISP, and LCD driver in compact camera modules. IC Role / Device Role / Timing Role: High-efficiency triple buck supplying 1.8V (sensor), 2.8V (ISP), and 3.3V (LCD) with minimal output ripple in Burst Mode™. Use Value: 58μA IQ per channel extends battery life during viewfinder standby; 0.6V reference ensures stable low-voltage rails under varying load conditions. | Use Scenario: Powering microcontroller, ADC, and wireless SoC in handheld test equipment and medical monitors. IC Role / Device Role / Timing Role: Point-of-load regulator generating isolated 3.3V, 2.5V, and 1.8V rails with independent enable/disable for subsystem power gating. Use Value: Thermal QFN package sustains continuous operation at 85°C ambient; SYNC input allows EMI reduction via spread-spectrum clock alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023BRSBR | Triple 600mA buck + LDOs; 2.25MHz; fixed 1.2V/1.5V/1.8V outputs; no SYNC pin; 0.8V ref | Fixed-output variant - less flexible for custom voltage combinations; lacks independent RUN/PGOOD per channel | Select if board space allows larger 4mm × 4mm QFN and fixed voltages meet system needs; avoid if programmable outputs or sequencing control required. |
| RTQ2132B-QA | Triple 800mA buck; 2.1MHz; 0.6V ref; PGOOD per channel; but no Burst Mode™ - minimum IQ = 120μA | Higher light-load IQ reduces battery life in always-on portable devices; no low-ripple Burst Mode™ option | Choose only if external clock sync is unnecessary and system prioritizes cost over ultra-low IQ; verify thermal margin at 125°C junction. |
Compared with TPS65023BRSBR and RTQ2132B-QA, the LTC3545EUD#PBF uniquely combines independent programmable outputs, true low-ripple Burst Mode™, and 58μA IQ - making it optimal for battery-critical, multi-rail portable designs requiring both flexibility and efficiency.
Availability
LTC3545EUD#PBF is available at Aetrix Electronics and suitable for smartphone power management, wireless modem subsystems, and portable instrumentation requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature grade (–40°C to 125°C).
Supply support for LTC3545EUD#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3545 product line was designed specifically for high-density, battery-powered portable electronics requiring multiple low-noise, efficient DC/DC rails - emphasizing small footprint, low IQ, and robust sequencing capability.
FAQ
What is the maximum output current per channel for the LTC3545EUD#PBF?
The LTC3545EUD#PBF supports up to 800mA continuous output current per channel under typical thermal conditions (θJA = 55°C/W, TA ≤ 85°C). Derating is required at higher ambient temperatures or in dropout operation; full 800mA per channel is achievable across all three regulators simultaneously only with adequate PCB copper pour and airflow.
Does the LTC3545EUD#PBF support external clock synchronization?
Yes, the LTC3545EUD#PBF supports external clock synchronization via the SYNC/MODE pin (Pin 9). When driven by a 1MHz to 3MHz square wave, the device locks its switching frequency to the external clock while operating in pulse-skip mode - enabling EMI reduction and system-level clock alignment.
How does Burst Mode™ operation differ from pulse-skip mode on the LTC3545EUD#PBF?
Burst Mode™ operation on the LTC3545EUD#PBF reduces quiescent current to 58μA per regulator and produces higher output ripple (<20mVP-P) but achieves >85% efficiency at 1mA load. Pulse-skip mode maintains continuous internal bias, yields lower ripple, but draws ~310μA and is less efficient below ~10mA - selected via the SYNC/MODE pin state.
Can the LTC3545EUD#PBF be used with ceramic output capacitors?
Yes, the LTC3545EUD#PBF is fully compatible with ceramic output capacitors. Its current-mode control loop does not rely on capacitor ESR for stability, allowing use of low-ESR X5R/X7R ceramics (e.g., 10μF, 0805) to achieve minimal output ripple and compact layout - verified in typical application circuits.
What is the function of the exposed pad (Pin 17) on the LTC3545EUD#PBF?
The exposed pad (Pin 17) on the LTC3545EUD#PBF is electrically and thermally connected to GND. It must be soldered to a solid PCB ground plane to ensure proper thermal dissipation (θJA = 55°C/W) and electrical noise suppression - omission risks thermal shutdown and degraded PGOOD accuracy.
LTC3545EUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3545EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3545EUD#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 LTC3545EUD#PBF reliable?
The price and inventory of LTC3545EUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3545EUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3545EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3545EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3545EUD#PBF?
LTC3545EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3545EUD#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 LTC3545EUD#PBF?
For technical support, including LTC3545EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3545EUD#PBF requirements.
6.How does Aetrix verify that LTC3545EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3545EUD#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 LTC3545EUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3545EUD#PBF?
All LTC3545EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3545EUD#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 LTC3545EUD#PBF part is unused and in its original packaging.
Return procedure for LTC3545EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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