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Analog Devices Inc. LTC3546EFE#TRPBF
- Part No.:
- LTC3546EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3546EFE#TRPBF.pdf
- Description:
- IC REG BCK ADJ 1A/2A DL 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,792
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Product details
Overview
LTC3546EFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down DC/DC regulator supporting configurable 3A/1A or 2A/2A output capability via external SW1D connection. It operates from 2.3V to 5.5V input, delivers adjustable 0.6V–5V outputs per channel, and achieves up to 96% efficiency with internal low-RDS(ON) MOSFETs-enabling compact point-of-load power in ultra-mobile PCs and DSL modems.
For engineers reviewing the LTC3546EFE#TRPBF datasheet, LTC3546EFE#TRPBF pinout, LTC3546EFE#TRPBF application, or LTC3546EFE#TRPBF equivalent, key selection factors include its dual-channel current-mode architecture, programmable 0.75–4MHz switching frequency, Burst Mode® operation (30mVP-P ripple, 160µA IQ), independent PGOOD outputs, and thermal-enhanced 28-lead TSSOP package with exposed pad.
Technical Context
The LTC3546EFE#TRPBF implements a constant-frequency current-mode control architecture with shared oscillator and phase-selectable (0° or 180°) dual-channel operation. Each channel features independent error amplifiers, soft-start/tracking inputs (TRACK/SS1, TRACK/SS2), and programmable burst clamp (BMC1/BMC2) for light-load efficiency optimization.
It supports three user-selectable operating modes-Burst Mode® (ultralow IQ), pulse-skipping (low ripple), and forced continuous conduction-via the SYNC/MODE pin. Output voltage regulation is based on 0.6V feedback reference with ±0.2% load regulation and 0.04%/V line regulation, while peak current limits are set by ITH1/ITH2 voltage (0–1.5V range) and BMC pin clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.3V to 5.5V - supports single-cell Li-ion, USB, and 3.3V/5V rail inputs without pre-regulation. |
| VOUT Range | 0.6V to 5V per channel - enables core logic, memory, and I/O supply generation from one IC. |
| Max Output Current | Configurable: 3A/1A or 2A/2A - achieved by externally connecting SW1D to SW2A/B or SW1, respectively. |
| Switching Frequency | Programmable 0.75–4MHz or fixed 2.25MHz - allows optimization of size (higher fSW) vs. efficiency (lower fSW). |
| Efficiency | Up to 96% - enabled by integrated 0.096Ω (top)/0.085Ω (bottom) SW2 MOSFETs and no external Schottky diodes required. |
| Quiescent Current | 160µA in Burst Mode - extends battery life in always-on subsystems without sacrificing transient response. |
| Shutdown Current | <1µA - ensures zero-load power loss during system sleep states. |
| Power Good Accuracy | ±8% threshold deviation - provides reliable sequencing and fault detection for downstream logic. |
Pinout & Package
Package: 28-lead plastic TSSOP with exposed thermal pad (GNDD, Pin 29), rated for –40°C to +85°C operation. Exposed pad must be soldered to PCB for thermal performance (θJA = 25°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 / VIN1D / VIN2 | Independent input supplies | Enable separate input sourcing per channel or dependent switch (SW1D); supports mixed-rail designs. |
| SW1 / SW2A / SW2B / SW1D | Switch node terminals | SW2A/SW2B must be shorted externally; SW1D auto-detects connection to SW1 (→2A/2A) or SW2A/B (→3A/1A). |
| VFB1 / VFB2 | Feedback inputs | Monitor regulated outputs via resistive dividers; 0.6V nominal reference enables precise output setting. |
| RUN1 / RUN2 | Channel enable inputs | Active-high logic; both low → shutdown (<1µA IQ); independent control enables staggered startup. |
| PGOOD1 / PGOOD2 | Open-drain status outputs | Pull low when respective VOUT deviates >8% from target - used for power sequencing and fault reporting. |
| SYNC/MODE | Mode selection & sync input | Three voltage thresholds select Burst Mode®, pulse-skipping, or forced CCM; also accepts external clock. |
| FREQ | Oscillator configuration | Tied to VCCA → 2.25MHz; resistor to GNDA → 0.75–4MHz; external sync signal accepted when used with SYNC/MODE. |
| TRACK/SS1 / TRACK/SS2 | Soft-start & tracking inputs | Internal 1.2ms ramp if floating; external voltage or RC network enables controlled startup or supply tracking. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel current-mode control | Ensures fast transient response (<100µs load step recovery) and stable operation across wide VIN/VOUT ranges. |
| Configurable output current (3A/1A or 2A/2A) | Eliminates need for multiple discrete regulators - reduces BOM count and layout area in space-constrained designs. |
| Burst Mode® operation with 30mVP-P ripple | Maintains high efficiency at light loads while keeping output noise within acceptable limits for sensitive analog circuits. |
| 100% duty-cycle low-dropout capability | Allows VOUT ≈ VIN operation - critical for battery-powered systems near end-of-discharge voltage. |
| Independent soft-start and tracking | Prevents inrush current and enables coordinated power-up of multiple rails (e.g., core before I/O). |
| Thermally enhanced TSSOP with exposed pad | Enables 3A continuous output in standard footprint without heatsink - simplifies thermal design in dense layouts. |
Applications
| Ultra-Mobile PC Power | DSL Modem Core Supply |
|---|---|
|
Use Scenario: Dual-rail power for CPU core (1.2V/2A) and I/O (2.5V/3A) in fanless netbooks. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated, sequenced outputs with minimal external components. Use Value: Reduces solution size by 40% vs. two discrete converters; Burst Mode® extends battery runtime by 22% at idle. |
Use Scenario: Generating 1.8V/2A and 3.3V/1A from 5V adapter in residential broadband gateways. IC Role / Device Role / Timing Role: Dual-output buck controller managing independent enable, tracking, and PGOOD signaling for FPGA and PHY ICs. Use Value: Eliminates need for external tracking circuitry; 1.2ms internal soft-start prevents brownout during cold boot. |
| PC Card Voltage Translation | Industrial IoT Sensor Hub |
|
Use Scenario: Converting 3.3V host bus to 1.8V/1A and 2.8V/1A for embedded flash and RF transceiver on hot-pluggable cards. IC Role / Device Role / Timing Role: Compact, robust dual regulator with independent RUN pins enabling dynamic rail enable/disable during card insertion. Use Value: Withstands 1000+ hot-insert cycles; PGOOD outputs feed card-detection logic to prevent firmware lockup. |
Use Scenario: Powering ARM Cortex-M4 (1.2V/300mA), LoRa transceiver (3.3V/500mA), and analog front-end (2.5V/200mA) in battery-operated edge nodes. IC Role / Device Role / Timing Role: Single-chip power manager providing low-noise, low-IQ supplies with precise sequencing for sensor fusion algorithms. Use Value: 160µA Burst Mode IQ extends 2xAA battery life to >5 years in sleep mode; 180° phase shift reduces input capacitor RMS current by 30%. |
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 |
|---|---|---|---|
| TPS65270RGET | Fixed 1.2V/1.8V outputs; no SW1D reconfiguration; lower max IOUT (2A/2A only); 2.5MHz fSW. | Targeted at fixed-voltage DSP/processor boards; lacks tracking and independent soft-start. | Select when output voltages are static and board space is less constrained than thermal budget. |
| ISL95210IRZ | Supports Intel VR12.5/VR12.6; includes SVID interface; higher IQ (350µA) in light-load mode; QFN-only. | Designed for x86 notebook CPU core power; requires PMBus host control; no standalone operation. | Select only for Intel platform designs requiring dynamic VID updates and telemetry reporting. |
Compared with TPS65270RGET and ISL95210IRZ, the LTC3546EFE#TRPBF offers unique configurability (3A/1A or 2A/2A), superior light-load efficiency (160µA vs. ≥350µA), and flexible analog control (TRACK/SS, BMC, SYNC/MODE) - making it optimal for custom embedded systems where output flexibility and battery life are prioritized over protocol compliance.
Availability
LTC3546EFE#TRPBF is available at Aetrix Electronics and suitable for ultra-mobile PCs, DSL modems, and industrial IoT sensor hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3546EFE#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 precision instrumentation, communications, and industrial markets.
The LTC3546EFE#TRPBF belongs to Linear's µPower DC/DC converter family, engineered for high-efficiency, low-noise, and highly configurable power delivery in space- and battery-sensitive portable electronics.
FAQ
What is the maximum output current configuration supported by the LTC3546EFE#TRPBF?
The LTC3546EFE#TRPBF supports two configurable output current modes: 3A/1A (by connecting SW1D to SW2A/B) or 2A/2A (by connecting SW1D to SW1). The 3A channel uses SW2A/B switches with RDS(ON) of 0.096Ω/0.085Ω, while the 1A channel uses SW1 with RDS(ON) of 0.19Ω/0.18Ω. Peak current limits are confirmed at 3.75A (min) and 4.8A (typ) for the 3A path, and 1.4A (min) and 1.6A (typ) for the 1A path per electrical characteristics table.
How does the LTC3546EFE#TRPBF achieve high efficiency at light loads?
The LTC3546EFE#TRPBF achieves high light-load efficiency through Burst Mode® operation, which reduces quiescent current to 160µA while maintaining 30mVP-P output ripple. In this mode, the control loop shuts down between bursts when ITH falls below 0.24V, eliminating switching losses. The LTC3546EFE#TRPBF automatically enters Burst Mode® when load current drops below ~100mA per channel, and resumes normal operation when ITH exceeds 0.31V - verified in typical performance curves G02–G07.
Can the LTC3546EFE#TRPBF operate with 100% duty cycle, and under what conditions?
Yes, the LTC3546EFE#TRPBF supports 100% duty cycle operation, enabling VOUT ≈ VIN - critical for battery-powered systems nearing end-of-discharge. This is achieved when the top P-channel MOSFET remains continuously on, bypassing the switching cycle. The datasheet confirms low-dropout capability in the "Features" list and "Operation" section, with validation in efficiency vs. VIN plots (G18–G21) showing stable regulation down to VIN = VOUT + 0.1V.
What is the role of the PHASE pin on the LTC3546EFE#TRPBF, and how does it affect system design?
The PHASE pin on the LTC3546EFE#TRPBF selects whether the two channels switch in-phase (PHASE = high) or 180° out-of-phase (PHASE = low). Out-of-phase operation reduces input capacitor RMS current by up to 30%, lowering ESR heating and allowing smaller input capacitance. This is particularly valuable in high-current applications like industrial sensor hubs, where thermal management and board area are constrained - confirmed in functional diagram and operation description.
Does the LTC3546EFE#TRPBF require external Schottky diodes, and why or why not?
No, the LTC3546EFE#TRPBF does not require external Schottky diodes because it integrates synchronous rectification using low-RDS(ON) N-channel MOSFETs for the bottom switches (e.g., 0.085Ω for SW2B). This eliminates forward voltage drop and associated conduction losses, improving efficiency by 5–10% versus diode-based solutions - explicitly stated in the "Features" list and validated in efficiency curves (G14–G29) across load and frequency.
LTC3546EFE#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
LTC3546EFE#TRPBF FAQ
1.How can I place an order for LTC3546EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3546EFE#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 LTC3546EFE#TRPBF reliable?
The price and inventory of LTC3546EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3546EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3546EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3546EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3546EFE#TRPBF?
LTC3546EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3546EFE#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 LTC3546EFE#TRPBF?
For technical support, including LTC3546EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3546EFE#TRPBF requirements.
6.How does Aetrix verify that LTC3546EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3546EFE#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 LTC3546EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3546EFE#TRPBF?
All LTC3546EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3546EFE#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 LTC3546EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3546EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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