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Analog Devices Inc. LTC3546IFE#TRPBF
- Part No.:
- LTC3546IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3546IFE#TRPBF.pdf
- Description:
- IC REG BCK ADJ 1A/2A DL 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,620
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Product details
Overview
LTC3546IFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down DC/DC regulator with configurable 3A/1A or 2A/2A output capability, operating from 2.3V to 5.5V input and delivering adjustable outputs from 0.6V to 5V per channel. It integrates low-RDS(ON) internal MOSFETs (0.096Ω top/0.085Ω bottom for Channel 2), supports 2.25MHz fixed or 0.75–4MHz adjustable switching frequency, and features independent power-good signals, tracking/soft-start, and Burst Mode® operation for high light-load efficiency in point-of-load applications.
For engineers reviewing the LTC3546IFE#TRPBF datasheet, LTC3546IFE#TRPBF pinout, LTC3546IFE#TRPBF application, or LTC3546IFE#TRPBF equivalent, key selection criteria include its dual-channel current-mode architecture, SW1D-dependent configuration flexibility, thermal performance in the 28-lead TSSOP package (θJA = 25°C/W), and support for 100% duty-cycle low-dropout operation - all critical for compact, high-efficiency power management in space-constrained embedded systems.
Technical Context
The LTC3546IFE#TRPBF employs a constant-frequency current-mode control architecture with shared oscillator and phase-selectable (in-phase or 180° out-of-phase) switching for EMI reduction. Each channel uses an error amplifier (2.5MHz GBW) comparing VFB to a 0.6V reference, with ITH pins setting peak inductor current (e.g., ILIM2 = 2.8–3.2A typical for SW2A/B).
Its configurable topology relies on external connection of SW1D to either SW1 (enabling 2A/2A) or SW2A/SW2B (enabling 3A/1A), with auto-detection logic and dedicated BMC pins (BMC1/BMC2) for externally setting Burst Mode clamp thresholds between 0V and 0.6V. The device supports three user-selectable light-load modes: Burst Mode (30mVP-P ripple, IQ = 160µA), pulse-skipping, and forced continuous conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.3V to 5.5V - supports single-cell Li-ion, USB, and intermediate bus rails without pre-regulation. |
| VOUT Range | 0.6V to 5V per channel - enables core voltage scaling for modern processors and FPGAs. |
| Switching Frequency | 2.25MHz fixed or 0.75–4MHz adjustable - allows optimization of size vs. efficiency; 2.25MHz enables ultra-small 0.56µH/1.22µH inductors. |
| Peak Output Current | Configurable: 3A/1A or 2A/2A - achieved via SW1D routing; eliminates need for discrete current-sharing circuitry. |
| Efficiency | Up to 96% - enabled by integrated 0.096Ω/0.085Ω RDS(ON) switches and no external Schottky diodes required. |
| Light-Load IQ | 160µA in Burst Mode - extends battery life in always-on subsystems without sacrificing transient response. |
| Shutdown Current | <1µA - ensures minimal standby drain in portable and IoT devices during deep sleep. |
Pinout & Package
Package: 28-lead plastic TSSOP (FE package), thermally enhanced with exposed pad (Pin 29 = GNDD) requiring PCB soldering for rated thermal performance (θJA = 25°C/W). Operating junction temperature range: –40°C to 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 / VIN2 / VIN1D | Independent input supply rails | Enable separate sourcing for each channel (e.g., VIN1 for 1A path, VIN2 for 2A path, VIN1D for dependent switch) - improves PSRR and fault isolation. |
| SW1 / SW2A / SW2B / SW1D | Switch node terminals | SW2A/SW2B must be shorted externally; SW1D connects to SW1 (2A/2A) or SW2A/B (3A/1A); defines current capability and layout routing constraints. |
| VFB1 / VFB2 | Feedback inputs | Monitor regulated outputs via resistive dividers; 0.6V nominal reference enables precise output setting with <±0.2% load regulation. |
| BMC1 / BMC2 | Burst Mode clamp controls | Set Burst Mode activation threshold (0–0.6V); tie to GND to disable Burst Mode - direct control over light-load noise/efficiency trade-off. |
| TRACK/SS1 / TRACK/SS2 | Tracking/soft-start inputs | Support external voltage ramp tracking (e.g., for power sequencing) or capacitor-based soft-start (>1.2ms ramp time required). |
| PGOOD1 / PGOOD2 | Power-good open-drain outputs | Assert low when output deviates >–8% from target - enables system-level power sequencing and fault monitoring. |
| RUN1 / RUN2 | Channel enable inputs | Active-high logic; both low = shutdown (<1µA IQ) - provides independent channel control and system-level power gating. |
| FREQ / SYNC/MODE | Frequency configuration & mode selection | FREQ sets oscillator (VIN = 2.25MHz, resistor = 0.75–4MHz); SYNC/MODE selects Burst/Pulse-Skipping/Forced Continuous or accepts external clock. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel current-mode control | Ensures fast line/load transient response (<100µs recovery) and stable operation across wide input/output ranges without external compensation. |
| Configurable 3A/1A or 2A/2A output | Eliminates need for two separate regulators or complex current-sharing circuits - reduces BOM count and PCB area in multi-rail systems. |
| Integrated low-RDS(ON) MOSFETs | 0.096Ω/0.085Ω (SW2A/B) and 0.19Ω/0.18Ω (SW1) reduce conduction losses and thermal stress - enables 3A output without external heatsinking. |
| Burst Mode® with 30mVP-P ripple | Maintains high efficiency at microamp loads while limiting output voltage excursion - ideal for always-on sensor nodes and real-time clocks. |
| 100% duty-cycle low-dropout operation | Allows VOUT to track VIN closely (e.g., 3.3V out from 3.6V in) - preserves headroom in battery-powered systems nearing end-of-life. |
| Independent tracking/soft-start & power-good | Enables precise power sequencing (e.g., FPGA core before I/O) and system-level fault detection - critical for reliable boot-up in industrial controllers. |
Applications
| Mobile Computing Power | DSL/Modem Point-of-Load |
|---|---|
|
Use Scenario: Dual-rail power for ultra-mobile PC CPU core (1.2V/1A) and DDR memory interface (2.5V/3A) from single 3.6V Li-ion battery. IC Role / Device Role / Timing Role: Primary dual-output buck regulator with SW1D connected to SW2A/B to configure 3A/1A output; provides tightly regulated, sequenced supplies with PGOOD feedback to host controller. Use Value: Eliminates discrete 3A converter and saves >25mm² PCB area versus two monolithic solutions; 96% peak efficiency extends battery runtime by 12% vs. legacy controllers. |
Use Scenario: Compact power solution for DSL modem SoC requiring 1.8V/2A digital core and 3.3V/1A analog PHY from 5V adapter input. IC Role / Device Role / Timing Role: Dual buck regulator with SW1D connected to SW1 to achieve 2A/2A configuration; TRACK/SS1 and TRACK/SS2 synchronized to ensure controlled power-up sequence. Use Value: Reduces component count by 40% vs. discrete regulators; 2.25MHz operation enables use of 0.56µH inductors, cutting solution height to <1.2mm. |
| Industrial Sensor Hub | Embedded Wireless Gateway |
|
Use Scenario: Power management for low-power sensor fusion hub with ARM Cortex-M4 (1.2V/300mA) and RF transceiver (3.3V/500mA) operating from 3.7V LiPo. IC Role / Device Role / Timing Role: Dual buck regulator in Burst Mode; RUN1/RUN2 independently controlled to gate power to subsystems; PGOOD1/PGOOD2 feed MCU GPIOs for health monitoring. Use Value: 160µA quiescent current in Burst Mode extends 1000mAh battery life to >18 months in sleep mode; ±0.2% load regulation ensures ADC reference stability. |
Use Scenario: Power delivery for Wi-Fi 6 gateway SoC with 1.1V/2A CPU, 1.8V/1A memory, and 3.3V/500mA peripherals from 5V USB-C PD source. IC Role / Device Role / Timing Role: Dual buck regulator with FREQ set to 1.5MHz (143kΩ to GNDA) balancing efficiency and EMI; PHASE pin set for 180° out-of-phase switching to reduce input ripple. Use Value: 0.75–4MHz frequency adjustability allows EMI compliance across multiple board layouts; 100% duty cycle supports brownout operation down to 3.3V input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65270PWPR | Fixed 1.2V/3.3V dual outputs; no SW1D configurability; lower max IOUT (2A/2A only); 2.2MHz fixed frequency. | Best suited for fixed-voltage applications like set-top boxes; lacks adjustable VOUT and Burst Mode flexibility. | Select when board space is constrained and output voltages are static - avoids external feedback resistors but sacrifices design adaptability. |
| ISL95210IRZ | Supports 3-phase interleaving; higher max VIN (24V); requires external MOSFETs; no integrated Burst Mode. | Targeted at high-input industrial supplies (e.g., 12V/24V PoL); not suitable for sub-6V battery-powered designs. | Choose for 12–24V input systems needing >5A total output; avoid for 3–5V battery rails due to lack of low-VIN optimization and higher BOM cost. |
Compared with TPS65270PWPR and ISL95210IRZ, the LTC3546IFE#TRPBF uniquely combines configurable current allocation (3A/1A or 2A/2A), 2.3–5.5V input compatibility, integrated Burst Mode, and 0.6V programmable outputs - making it the only option capable of meeting dynamic multi-rail requirements in ultra-portable and battery-critical applications without external components or layout compromises.
Availability
LTC3546IFE#TRPBF is available at Aetrix Electronics and suitable for mobile computing power, DSL/modem point-of-load conversion, industrial sensor hubs, and embedded wireless gateways requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term production continuity.
Supply support for LTC3546IFE#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC3546IFE#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, designed specifically for space-constrained, battery-sensitive applications demanding configurable multi-rail power with minimal external components and robust thermal performance.
FAQ
What is the maximum output current configuration supported by the LTC3546IFE#TRPBF?
The LTC3546IFE#TRPBF supports two configurable output current modes: 3A/1A (by connecting SW1D to SW2A/B) or 2A/2A (by connecting SW1D to SW1). Peak current limits are confirmed as ILIM2+1D = 3.75–4.8A (3A channel) and ILIM1+1D = 2.5–3.2A (2A channel) under specified conditions, enabling flexible power partitioning without external current-sharing circuitry.
How does the LTC3546IFE#TRPBF achieve high efficiency at light loads?
The LTC3546IFE#TRPBF achieves high light-load efficiency through Burst Mode® operation, which reduces quiescent current to 160µA and minimizes switching losses by intermittently activating the power switches only when needed. This mode delivers up to 96% peak efficiency and maintains 30mVP-P output ripple, making it ideal for battery-powered applications with variable or intermittent load profiles.
Can the LTC3546IFE#TRPBF operate with input voltage below 3V?
Yes, the LTC3546IFE#TRPBF operates from 2.3V to 5.5V input, making it compatible with single-cell Li-ion (2.7–4.2V), LiFePO4 (2.0–3.6V), and USB-powered systems. Its 100% duty-cycle capability allows VOUT to track VIN closely - for example, sustaining 3.3V output from a 3.4V input - critical for maintaining functionality as batteries discharge.
What is the role of the PHASE pin on the LTC3546IFE#TRPBF?
The PHASE pin on the LTC3546IFE#TRPBF selects the relative switching timing between Channel 1 and Channel 2: pulled high for in-phase operation (reducing output capacitor RMS current), or grounded for 180° out-of-phase operation (halving input capacitor ripple current). This feature directly impacts EMI profile and capacitor sizing - essential for meeting Class B emissions standards in compact enclosures.
Does the LTC3546IFE#TRPBF require external Schottky diodes?
No, the LTC3546IFE#TRPBF does not require external Schottky diodes. It integrates synchronous N-channel MOSFETs for the bottom switches (RDS(ON) = 0.085Ω typical for SW2A/B), eliminating reverse-recovery losses and improving efficiency by up to 8% compared to asynchronous designs - reducing thermal stress and simplifying layout.
LTC3546IFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 1A, 2A
- Frequency - Switching:
- 2.25MHz, 750kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LTC3546IFE#TRPBF FAQ
1.How can I place an order for LTC3546IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3546IFE#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 LTC3546IFE#TRPBF reliable?
The price and inventory of LTC3546IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3546IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3546IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3546IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3546IFE#TRPBF?
LTC3546IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3546IFE#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 LTC3546IFE#TRPBF?
For technical support, including LTC3546IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3546IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3546IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3546IFE#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 LTC3546IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3546IFE#TRPBF?
All LTC3546IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3546IFE#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 LTC3546IFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3546IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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