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Analog Devices Inc. LTC3545IUD-1#TRPBF
- Part No.:
- LTC3545IUD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3545IUD-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 800MA TRPL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LTC3545IUD-1#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 fixed 2.25MHz switching frequency, Burst Mode® operation only, and dedicated PGOOD pins for all three channels. It supports 2.25V–5.5V input and enables low-voltage point-of-load regulation in space-constrained portable electronics.
For engineers reviewing the LTC3545IUD-1#TRPBF datasheet, LTC3545IUD-1#TRPBF pinout, LTC3545IUD-1#TRPBF application, or LTC3545IUD-1#TRPBF equivalent, key selection criteria include its guaranteed –40°C to 125°C operating junction temperature range, 0.6V feedback reference enabling sub-1V outputs, 58μA quiescent current in Burst Mode, and absence of SYNC/MODE functionality - replaced by PGOOD3.
Technical Context
The LTC3545IUD-1#TRPBF implements a constant-frequency, current-mode control architecture with internal P-channel and N-channel synchronous MOSFETs per channel. Each regulator operates independently with dedicated RUNx enable inputs and PGOODx open-drain indicators, enabling precise power-on sequencing across three rails.
Unlike the LTC3545 variant, the LTC3545IUD-1#TRPBF permanently disables external frequency synchronization and pulse-skip mode - it operates exclusively in Burst Mode® to maximize light-load efficiency. Its 0.6V reference voltage, ±1.2% accuracy over temperature, and 1.3A peak switch current limit support stable regulation under dynamic load steps up to 600mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - compatible with single Li-ion (2.7–4.2V typical) and regulated 3.3V/5V supplies. |
| Output Current per Channel | 800mA continuous - supports core logic, memory, and I/O rails in compact portable devices. |
| Switching Frequency | 2.25MHz fixed - enables use of small 1.5μH inductors and ceramic capacitors for minimal board area. |
| Quiescent Current | 58μA (Burst Mode) - extends battery life in standby/sleep states without compromising wake-up response. |
| Feedback Reference Voltage | 0.6V ±1.2% - allows precise programming of output voltages down to 0.6V using standard resistor dividers. |
| Power Good Threshold | ±7.5% deviation from VFB - ensures reliable rail monitoring and sequencing control with hysteresis. |
| Junction Temperature Range | –40°C to 125°C (guaranteed) - suitable for industrial and automotive-adjacent embedded applications. |
Pinout & Package
16-lead 3mm × 3mm plastic QFN package 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 connection points to external inductors; carry high di/dt switching currents - require tight layout and local PGND return. |
| PGOOD1, PGOOD2, PGOOD3 (Pins 2, 4, 9) | Open-drain power-good indicators | Assert low when respective VFB falls >7.5% below 0.6V - used for sequenced enable/disable of downstream circuitry. |
| RUN1, RUN2, RUN3 (Pins 14, 3, 10) | Independent regulator enable inputs | Logic-high (>1V) enables corresponding channel; logic-low (<0.3V) forces shutdown with <0.1μA leakage. |
| VFB1, VFB2, VFB3 (Pins 13, 12, 11) | Feedback inputs | Monitor output voltage via resistive divider; 80nA max leakage preserves accuracy in high-impedance networks. |
| VIN (Pin 15) | Control circuit supply | Powers internal bias, reference, and logic - must be decoupled with ≥10μF ceramic capacitor near pin. |
| GNDA (Pin 16) | Analog ground reference | Return path for internal reference and error amplifiers - separate from PGND to minimize noise coupling. |
| PVIN (Pin 7) | Power path supply for Reg2/Reg3 | Supplies gate drive and power switches for channels 2 and 3 - requires ≥4.7μF ceramic decoupling to PGND. |
| PGND (Pin 6) | Power ground for Reg2/Reg3 | Low-impedance return for high-current switch paths - must be connected directly to exposed pad and power planes. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation only | Guarantees 58μA IQ and >85% efficiency at 1mA load - eliminates need for external mode-selection logic. |
| Three independent PGOOD outputs | Enables deterministic, staggered power-up of multi-rail SoC subsystems without external supervisors. |
| 0.6V precision reference | Supports accurate low-voltage outputs (e.g., 0.8V, 1.05V, 1.2V) with <0.5% total error including line/load/temp drift. |
| Internal synchronous MOSFETs | Eliminates external Schottky diodes and reduces conduction losses - RDS(ON) ≤0.35Ω (P/N-FET) at 25°C. |
| Current-mode control | Delivers fast transient response (<10μs recovery from 0→600mA step) and inherent cycle-by-cycle current limiting. |
Applications
| Smartphone Core Power | DSL Modem PHY Supply |
|---|---|
Use Scenario: Powering application processor cores, GPU, and DDR memory I/O in ultra-thin smartphones with single-cell Li-ion battery. IC Role / Device Role / Timing Role: Triple-output PMIC providing independent, sequenced 1.05V CPU, 1.2V GPU, and 1.8V memory I/O rails. Use Value: 2.25MHz switching enables 1.5μH inductors and 10μF ceramic caps per rail - reducing total solution size by >40% vs lower-frequency alternatives. |
Use Scenario: Generating isolated analog and digital supply rails for DSL line driver and receiver ICs in residential gateways. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering 3.3V analog, 2.5V digital, and 1.8V interface rails with independent enable/control. Use Value: Three dedicated PGOOD pins simplify compliance with ITU-T G.992.1 power sequencing requirements and reduce BOM count vs discrete regulators. |
| Digital Still Camera Sensor Bias | Portable Medical Instrument PoL |
Use Scenario: Supplying low-noise bias voltages to CMOS image sensor analog front-end, digital ISP, and flash LED drivers. IC Role / Device Role / Timing Role: High-efficiency triple buck delivering 2.8V sensor AVDD, 1.2V ISP core, and 3.3V LED driver rails with soft-start and fault monitoring. Use Value: Burst Mode® operation extends battery runtime during idle capture intervals while maintaining <20mVP-P ripple in active imaging mode. |
Use Scenario: Providing tightly regulated, low-EMI power to microcontroller, ADC, and wireless transceiver in handheld diagnostic devices. IC Role / Device Role / Timing Role: Point-of-load regulator generating 1.8V MCU core, 3.3V RF, and 5.0V display backlight rails from 3.6V Li-ion source. Use Value: Guaranteed –40°C to 125°C operation ensures reliability in sterilizable enclosures and ambient temperature excursions during field use. |
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 |
|---|---|---|---|
| LTC3545IUD#TRPBF | Includes SYNC/MODE pin for external clock sync or pulse-skip/Burst Mode selection; no PGOOD3. | Required where system-level clock synchronization or low-ripple active-mode operation is needed. | Select when design requires flexibility between Burst Mode and pulse-skip operation or external frequency alignment. |
| TPS65283-1RGER | Triple 1A buck with integrated LDO, I²C programmability, and thermal shutdown; 2.7–5.5V input; 2.2MHz default freq. | Preferred for designs needing digital configuration, higher current headroom, or mixed buck/LDO integration. | Choose when firmware-controlled voltage scaling, margining, or additional LDO rails are required alongside buck regulation. |
Compared with LTC3545IUD#TRPBF, the LTC3545IUD-1#TRPBF trades frequency flexibility and mode selection for guaranteed Burst Mode efficiency and full PGOOD coverage - making it optimal for battery-critical, fixed-frequency applications. The TPS65283-1RGER adds programmability and current headroom at the cost of higher complexity and larger footprint.
Availability
LTC3545IUD-1#TRPBF is available at Aetrix Electronics and suitable for smartphone power management, DSL modem PHY supplies, digital camera sensor biasing, portable medical instrument point-of-load regulation, and industrial handheld device power systems requiring stable component supply across extended temperature ranges.
Supply support for LTC3545IUD-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, Inc. (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 family was designed specifically for compact, high-efficiency multi-rail power conversion in battery-powered portable electronics - emphasizing low quiescent current, small solution size, and robust sequencing capability without external supervision.
FAQ
What distinguishes LTC3545IUD-1#TRPBF from LTC3545IUD#TRPBF?
The LTC3545IUD-1#TRPBF replaces the SYNC/MODE pin with a third PGOOD output (PGOOD3) and permanently configures Burst Mode® operation only. In contrast, the LTC3545IUD#TRPBF retains the SYNC/MODE pin for external clock synchronization or manual selection between Burst Mode and pulse-skip mode. Both share identical 3×800mA capability, 2.25MHz base frequency, and –40°C to 125°C rating.
Does LTC3545IUD-1#TRPBF support external frequency synchronization?
No. The LTC3545IUD-1#TRPBF does not support external frequency synchronization. Its switching frequency is fixed at 2.25MHz. The SYNC/MODE pin present on the LTC3545 variant is repurposed as PGOOD3 in the LTC3545-1 version, eliminating all external clock input capability.
What is the maximum output current per channel for LTC3545IUD-1#TRPBF?
The LTC3545IUD-1#TRPBF delivers up to 800mA continuous output current per channel under typical conditions (TA ≤ 85°C, adequate PCB copper, 2.25V–5.5V input). Peak switch current is rated at 1.3A, supporting transient loads. Derating is required at elevated ambient temperatures or in dropout conditions.
How does the PGOOD function work on LTC3545IUD-1#TRPBF?
Each PGOOD pin (PGOOD1, PGOOD2, PGOOD3) is an open-drain output that pulls low when its corresponding feedback voltage (VFBx) drops more than 7.5% below the 0.6V reference - indicating output undervoltage. An external pull-up resistor is required. All three PGOOD signals operate independently, enabling precise power sequencing across multiple rails.
Can LTC3545IUD-1#TRPBF generate output voltages below 1.0V?
Yes. The LTC3545IUD-1#TRPBF supports output voltages as low as 0.6V using the internal 0.6V feedback reference and an external resistor divider. For example, a 1.0V output is achieved with R1 = 681kΩ and R2 = 1MΩ (VOUT = 0.6V × (1 + R1/R2)). Layout care is required for stability at low VOUT due to noise sensitivity.
LTC3545IUD-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)
LTC3545IUD-1#TRPBF FAQ
1.How can I place an order for LTC3545IUD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3545IUD-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 LTC3545IUD-1#TRPBF reliable?
The price and inventory of LTC3545IUD-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 LTC3545IUD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3545IUD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3545IUD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3545IUD-1#TRPBF?
LTC3545IUD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3545IUD-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 LTC3545IUD-1#TRPBF?
For technical support, including LTC3545IUD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3545IUD-1#TRPBF requirements.
6.How does Aetrix verify that LTC3545IUD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3545IUD-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 LTC3545IUD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3545IUD-1#TRPBF?
All LTC3545IUD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3545IUD-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 LTC3545IUD-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3545IUD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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