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Analog Devices Inc. LTC3546EFE#PBF
- Part No.:
- LTC3546EFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3546EFE#PBF.pdf
- Description:
- IC REG BCK ADJ 1A/2A DL 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,336
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Product details
Overview
LTC3546EFE#PBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down DC/DC regulator IC supporting configurable 3A/1A or 2A/2A output configurations. It operates from 2.3V to 5.5V input, delivers adjustable outputs from 0.6V to 5V per channel, and achieves up to 96% efficiency in Burst Mode. It is used in point-of-load power conversion for ultra-mobile PCs and DSL modems.
For engineers reviewing the LTC3546EFE#PBF datasheet, LTC3546EFE#PBF pinout, LTC3546EFE#PBF application, or LTC3546EFE#PBF equivalent, key selection criteria include dual-channel current-mode control, programmable switching frequency (0.75–4 MHz), independent tracking/soft-start, low-quiescent-current Burst Mode (160 µA), and thermal-enhanced 28-lead TSSOP packaging with exposed pad.
Technical Context
The LTC3546EFE#PBF implements a constant-frequency, current-mode architecture with shared oscillator and phase-selectable (0° or 180°) dual-channel operation. Each channel features independent error amplifiers, peak-current limiting via ITH pins, and auto-detecting dependent switch (SW1D) routing to SW1 or SW2A/B for reconfigurable output capability.
It supports three user-selectable light-load modes-Burst Mode (30 mVP-P ripple, 160 µA IQ), pulse-skipping, and forced continuous-with mode selection via SYNC/MODE voltage thresholds. Internal low RDS(ON) MOSFETs (0.096 Ω top / 0.085 Ω bottom for SW2A/B; 0.19 Ω / 0.18 Ω for SW1) eliminate external Schottky diodes and enable 100% duty-cycle low-dropout operation.
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 rail generation with external resistor dividers. |
| Switching Frequency | 0.75 MHz to 4 MHz - adjustable via FREQ pin resistor or sync to external clock; 2.25 MHz default reduces external component size. |
| Peak Output Current | Configurable: 3A/1A or 2A/2A - achieved by externally connecting SW1D to SW2A/B or SW1, respectively. |
| Efficiency | Up to 96% - measured at mid-load under Burst Mode, enabling high thermal efficiency in space-constrained designs. |
| IQ (Burst Mode) | 160 µA - minimizes standby power loss in battery-powered systems with infrequent load activity. |
| Shutdown Current | <1 µA - ensures negligible battery drain during system sleep or off-state. |
Pinout & Package
The LTC3546EFE#PBF is housed in a thermally enhanced 28-lead plastic TSSOP package (4 mm × 5 mm footprint) with exposed pad (Pin 29 = GNDD) that must be soldered to PCB for rated thermal performance (θJA = 25°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2, VIN1D | Independent input supply rails | Enable separate sourcing for each 1A/2A channel and dependent switch; supports mixed-rail input architectures. |
| SW1, SW2A/SW2B, SW1D | Switch node terminals | SW1D auto-detects connection to SW1 (→ 2A/2A) or SW2A/B (→ 3A/1A); SW2A/SW2B must be shorted externally. |
| VFB1/VFB2 | Feedback inputs | Monitor regulated output via resistive divider; nominal 0.6 V reference enables precise output setting and tracking. |
| TRACK/SS1/SS2 | Tracking/soft-start control | Supports internal soft-start (1.2 ms), external ramp, or supply tracking - critical for sequencing-sensitive SoCs/FPGAs. |
| BMC1/BMC2 | Burst Mode clamp control | Set Burst Mode threshold externally (0–0.6 V) or tie to VCCA for internal clamp; tie to GND to disable Burst Mode. |
| SYNC/MODE | Mode selection & clock sync | Voltage-controlled selection of Burst Mode (>VIN–0.5 V), pulse-skipping (<0.5 V), or forced continuous (VIN/2); also accepts external sync clock. |
| PGOOD1/PGOOD2 | Power-good status outputs | Open-drain signals pulled low when output deviates >8% below regulation - used for system power sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel current-mode control | Provides fast transient response and stable regulation across varying line/load conditions without external compensation. |
| Configurable output topology | SW1D auto-detection enables field-reconfigurable 2A/2A or 3A/1A operation - reduces BOM count and design variants. |
| 100% duty-cycle capability | Allows dropout-free operation down to VOUT ≈ VIN, essential for battery-powered systems near end-of-discharge. |
| Low-noise Burst Mode | 30 mVP-P output ripple at light loads preserves signal integrity in noise-sensitive analog/RF subsystems. |
| Thermally optimized TSSOP | Exposed pad and low θJA (25°C/W) sustain full 3A output in compact layouts without heatsinks or airflow. |
Applications
| Mobile Computing Power | DSL/Modem Point-of-Load |
|---|---|
Use Scenario: Powering CPU cores and DDR memory in ultra-mobile PCs with strict thermal and size constraints. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator delivering 1.2 V @ 1 A and 2.5 V @ 3 A with coordinated soft-start and power-good signaling. Use Value: Configurable 3A/1A output eliminates need for discrete secondary regulators, reducing board area and component count. | Use Scenario: Generating isolated 3.3 V and 1.8 V rails for ADSL PHY and digital baseband in residential gateways. IC Role / Device Role / Timing Role: Dual-output DC/DC converter with independent tracking and phase control to minimize input ripple and EMI. Use Value: 180° phase shift between channels cuts input capacitor RMS current by ~30%, lowering required capacitance and cost. |
| PC Card Power Management | Industrial Embedded Control |
Use Scenario: Providing regulated 1.2 V and 3.3 V from variable 3.6–5.5 V host bus in hot-pluggable PC Cards. IC Role / Device Role / Timing Role: Dual buck regulator with undervoltage lockout (2.03 V) and shutdown current <1 µA for safe insertion/removal. Use Value: Integrated PGOOD outputs enable automatic reset assertion and sequenced enable/disable during card hot-swap events. | Use Scenario: Supplying FPGA I/O banks and core logic in fanless industrial controllers operating from 24 V DC-DC intermediate bus. IC Role / Device Role / Timing Role: Point-of-load regulator converting 5 V intermediate rail to 1.2 V @ 2 A and 2.5 V @ 2 A with robust thermal management. Use Value: Exposed-pad TSSOP package sustains full load at 85°C ambient without derating - eliminates need for thermal vias or copper pours. |
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 |
|---|---|---|---|
| TPS54290RGER | Fixed 2A/2A dual output; no SW1D reconfiguration; 2.2–6 V input; 0.6–5.5 V output; integrated FETs; 300 kHz–2 MHz freq. | Less flexible output current allocation; lacks Burst Mode; higher IQ (250 µA active) but includes Eco-mode. | Select when fixed 2A/2A is sufficient and lower BOM cost outweighs configurability. |
| MP2491DD-LF-Z | Single 3A buck; no second channel; 4.5–26 V input; 0.8–15 V output; external compensation; 300 kHz–2.2 MHz freq. | Requires two separate ICs for dual-rail support; higher input voltage range suits 12 V intermediate bus systems. | Select when designing for wide-input industrial supplies and dual-rail needs can be met with discrete solutions. |
Compared with TPS54290RGER and MP2491DD-LF-Z, the LTC3546EFE#PBF uniquely supports on-the-fly 3A/1A or 2A/2A reconfiguration via SW1D routing, delivers superior light-load efficiency (160 µA vs. ≥250 µA), and integrates dual-channel tracking/sequencing - making it optimal for space- and battery-constrained portable electronics.
Availability
LTC3546EFE#PBF is available at Aetrix Electronics and suitable for netbooks, wireless modems, and point-of-load DC/DC conversion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3546EFE#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3546EFE#PBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC converters, engineered specifically for compact, high-density power delivery in portable and embedded systems where thermal performance and configuration flexibility are critical.
FAQ
What is the maximum supported switching frequency for the LTC3546EFE#PBF?
The LTC3546EFE#PBF supports a programmable switching frequency from 0.75 MHz to 4 MHz. When the FREQ pin is tied to VIN, it operates at a fixed 2.25 MHz. A resistor from FREQ to GNDA sets the frequency within the adjustable range; for example, a 143 kΩ resistor yields 1.5 MHz. External synchronization via the SYNC/MODE pin also supports frequencies within this band.
How does the LTC3546EFE#PBF achieve 3A/1A versus 2A/2A output configuration?
The LTC3546EFE#PBF achieves 3A/1A or 2A/2A output by externally connecting the SW1D pin to either SW2A/SW2B (for 3A/1A) or SW1 (for 2A/2A). Internal auto-detection circuitry identifies the connection and adjusts peak current limits accordingly: ILIM2+1D = 3.75–4.8 A (3A mode) or ILIM1+1D = 2.5–3.2 A (2A mode), while maintaining independent regulation per channel.
Does the LTC3546EFE#PBF require external Schottky diodes?
No, the LTC3546EFE#PBF does not require external Schottky diodes. It integrates synchronous N-channel and P-channel MOSFETs with low RDS(ON) (e.g., 0.096 Ω top / 0.085 Ω bottom for SW2A/B), enabling high-efficiency synchronous rectification and eliminating conduction losses and associated diode footprint/cost.
What is the purpose of the PHASE pin on the LTC3546EFE#PBF?
The PHASE pin on the LTC3546EFE#PBF selects the relative switching timing between Channel 1 and Channel 2. When pulled high, both channels switch in-phase; when grounded, they operate 180° out-of-phase. This reduces input capacitor RMS current and input ripple, improving EMI performance and allowing smaller input bulk capacitance in multi-rail systems.
Can the LTC3546EFE#PBF operate with only one channel enabled?
Yes, the LTC3546EFE#PBF supports independent channel enable/disable via RUN1 and RUN2 pins. Pulling RUN1 low disables Channel 1 while Channel 2 remains active (and vice versa). In half-active mode, quiescent current drops to 400–800 µA. Both RUN pins low places the device in shutdown with <1 µA supply current, preserving battery life.
LTC3546EFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3546EFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3546EFE#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 LTC3546EFE#PBF reliable?
The price and inventory of LTC3546EFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3546EFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3546EFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3546EFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3546EFE#PBF?
LTC3546EFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3546EFE#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 LTC3546EFE#PBF?
For technical support, including LTC3546EFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3546EFE#PBF requirements.
6.How does Aetrix verify that LTC3546EFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3546EFE#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 LTC3546EFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3546EFE#PBF?
All LTC3546EFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3546EFE#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 LTC3546EFE#PBF part is unused and in its original packaging.
Return procedure for LTC3546EFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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