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Analog Devices Inc. LTC3546IFE#PBF
- Part No.:
- LTC3546IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3546IFE#PBF.pdf
- Description:
- IC REG BCK ADJ 1A/2A DL 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:268
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Product details
Overview
LTC3546IFE#PBF 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 SW2A/B; 0.19Ω/0.18Ω for SW1), 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#PBF datasheet, LTC3546IFE#PBF pinout, LTC3546IFE#PBF application, or LTC3546IFE#PBF equivalent, this page delivers verified specifications including dual-channel current-mode control, 28-pin TSSOP package with exposed pad, ±8% PGOOD threshold, 160µA quiescent current in Burst Mode, and thermal shutdown protection - all critical for netbook, DSL modem, and PC card power design validation.
Technical Context
The LTC3546IFE#PBF implements a constant-frequency current-mode architecture with shared oscillator and user-selectable phase relationship (in-phase or 180° out-of-phase via PHASE pin). Its dual regulators operate synchronously using internal slope compensation and anti-shoot-through logic to ensure stable transient response and robust short-circuit protection.
Configurable operation modes - Burst Mode® (30mVP-P ripple, IQ = 160µA), pulse-skipping, and forced continuous - are selected via SYNC/MODE voltage level, enabling precise trade-offs between efficiency and noise. The device auto-detects SW1D connection (to SW1 or SW2A/B) to configure as either 2A/2A or 3A/1A, with independent ITH-based peak current control per channel.
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 external LDO pre-regulation. |
| VOUT Range | 0.6V to 5V per channel - enables core voltage scaling for processors, FPGAs, and memory interfaces. |
| Switching Frequency | 2.25MHz fixed or 0.75–4MHz adjustable - allows compact 1µH–2.2µH inductors and minimizes EMI in space-constrained layouts. |
| Peak Efficiency | Up to 96% - achieved with integrated 0.096Ω/0.085Ω (SW2) and 0.19Ω/0.18Ω (SW1) MOSFETs, eliminating need for external Schottky diodes. |
| Quiescent Current | 160µA in Burst Mode - extends battery life in always-on subsystems of portable electronics. |
| PGOOD Threshold | ±8% deviation from regulated VFB - provides reliable power sequencing feedback for system supervisors and microcontrollers. |
| Shutdown Current | <1µA - ensures zero-load leakage in powered-off states for ultra-low standby power designs. |
Pinout & Package
The LTC3546IFE#PBF is housed in a thermally enhanced 28-lead plastic TSSOP package (4mm × 9.7mm) with exposed pad (Pin 29 = GNDD), rated for –40°C to 125°C operation and θJA = 25°C/W. Soldering the exposed pad to PCB ground is mandatory for thermal performance and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1 / RUN2 | Channel enable inputs | Active-high logic; pulling either to 0V disables its regulator; both low places device in <1µA shutdown. |
| VFB1 / VFB2 | Feedback inputs | Monitor output voltage via resistive divider; nominal 0.6V reference enables precise output setting and load regulation (±0.2%). |
| SW1 / SW2A, SW2B | Switch node terminals | SW1 drives Channel 1 (1A); SW2A/SW2B must be tied externally and drive Channel 2 (2A); SW1D connects to either for reconfiguration. |
| PGOOD1 / PGOOD2 | Power-good open-drain outputs | Pull low when respective VOUT deviates >8% from target - used for sequencing, fault reporting, and system reset assertion. |
| TRACK/SS1 / TRACK/SS2 | Tracking/soft-start inputs | Enable output voltage ramp control: floating = internal 1.2ms soft-start; capacitor = programmable ramp; external voltage = supply tracking. |
| BMC1 / BMC2 | Burst Mode clamp inputs | Set Burst Mode threshold externally (0–0.6V); tie to VCCA for internal clamp; tie to GND to disable Burst Mode. |
| SYNC/MODE | Mode selection & sync input | Voltage level selects Burst Mode (>VIN–0.5V), pulse-skipping (<0.5V), or forced continuous (~VIN/2); also accepts external clock for synchronization. |
| FREQ | Frequency set input | Tie to VCCA for 2.25MHz; connect resistor to GNDA for 0.75–4MHz adjustment; adds PLL compensation when synchronized. |
Key Features
| Feature | Design Value |
|---|---|
| Dual configurable output topology | SW1D auto-detection enables field-reconfigurable 2A/2A (SW1D→SW1) or 3A/1A (SW1D→SW2A/B) without BOM change. |
| Low-noise Burst Mode® operation | 30mVP-P output ripple at light loads with 160µA IQ - preserves battery runtime while meeting noise-sensitive analog circuit requirements. |
| Independent tracking & soft-start | Per-channel TRACK/SS pins support coordinated power-up with other rails or custom ramp profiles via external capacitor (≥1.2ms). |
| Robust protection suite | Short-circuit protection, undervoltage lockout (2.03V rising), thermal shutdown, and 100% duty-cycle low-dropout operation. |
| Thermally optimized packaging | 28-lead TSSOP with soldered exposed pad delivers θJA = 25°C/W - sustains full 3A output in industrial temperature range without derating. |
Applications
| Netbook Core Power | DSL Modem SoC Supply |
|---|---|
Use Scenario: Dual-rail power for Intel Atom or ARM-based netbook platforms requiring 1.2V CPU core and 2.5V I/O simultaneously. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 1A @ 1.2V and 3A @ 2.5V with tight tracking during startup. Use Value: Eliminates need for two discrete regulators; SW1D reconfiguration supports platform variants with identical PCB layout. |
Use Scenario: Power management for broadband DSL modems integrating ADSL2+ PHY, DSP, and Ethernet MAC. IC Role / Device Role / Timing Role: Supplies 1.8V DSP core and 3.3V interface rail with independent PGOOD signaling for firmware-controlled power sequencing. Use Value: 96% peak efficiency reduces thermal load in sealed plastic enclosures; Burst Mode extends standby time during line-idle periods. |
| PC Card Interface Power | Industrial FPGA I/O Bank Supply |
Use Scenario: Compact power solution for Type II PC Cards with limited board area and strict height constraints. IC Role / Device Role / Timing Role: Generates 1.5V and 3.3V from 5V host bus, using 2.25MHz switching to fit sub-2mm height inductors. Use Value: TSSOP package with exposed pad meets IPC-7351 footprint standards; no external diodes reduce component count by 4 parts per channel. |
Use Scenario: Configurable I/O bank supply for Xilinx Spartan-7 or Intel MAX 10 FPGAs requiring multiple voltage domains. IC Role / Device Role / Timing Role: Delivers 2A @ 1.8V and 2A @ 2.5V with 180° phase shift (PHASE = 0V) to minimize input capacitor RMS current. Use Value: Phase control cuts input ripple by ~30%, allowing smaller 22µF ceramic input capacitors instead of 47µF - saving 30% board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65270PWP | Fixed 1.2V/3.3V outputs; no SW1D reconfiguration; lower max IOUT (2.5A/1.5A); requires external compensation. | Best suited for fixed-voltage embedded systems where flexibility is secondary to cost and qualification time. | Select when BOM simplification and AEC-Q100 qualification (Grade 3) are required over configurability. |
| ISL95210IRZ | Supports Intel VR12.5/VR12.6 protocols; includes SVID interface; higher pin count (40-QFN); no Burst Mode. | Targeted at CPU VR applications with dynamic VID control; not suitable for standalone point-of-load use. | Choose only for notebook CPU core power with IMVP-6/7 compliance; avoid for generic dual-buck designs. |
Compared with TPS65270PWP and ISL95210IRZ, the LTC3546IFE#PBF uniquely combines field-reconfigurable output current (2A/2A ↔ 3A/1A), integrated Burst Mode for ultra-low IQ, and TSSOP packaging - making it optimal for cost-sensitive, space-constrained, and battery-powered dual-rail systems where flexibility and efficiency are co-prioritized.
Availability
LTC3546IFE#PBF is available at Aetrix Electronics and suitable for netbook power management, DSL modem SoC supplies, and PC card interface power requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC3546IFE#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 ICs, serving industrial, automotive, communications, and computing markets with precision, reliability, and innovation.
The LTC3546IFE#PBF belongs to Linear's high-efficiency monolithic DC/DC converter product line, designed specifically for medium-power point-of-load applications demanding configurability, low quiescent current, and robust thermal performance in compact packages.
FAQ
What is the maximum output current configuration supported by the LTC3546IFE#PBF?
The LTC3546IFE#PBF supports two primary configurations: 3A/1A (SW1D connected to SW2A/B) and 2A/2A (SW1D connected to SW1). In the 3A/1A mode, SW2A/B delivers up to 3A with ILIM2+1D = 3.75A (typ), while SW1 maintains 1A. The 2A/2A mode uses SW1 + SW1D for 2A and SW2A/B for 2A, with ILIM1+1D = 2.5A (typ). Both configurations are validated per the datasheet's absolute maximum ratings and thermal limits in the 28-lead TSSOP package.
Does the LTC3546IFE#PBF require external Schottky diodes?
No, the LTC3546IFE#PBF does not require external Schottky diodes. It integrates synchronous N-channel MOSFET bottom switches with RDS(ON) as low as 0.085Ω (SW2) and 0.18Ω (SW1), enabling high-efficiency operation across load ranges without conduction losses or thermal overhead associated with discrete diodes. This integration is explicitly confirmed in the "No Schottky Diodes Required" feature list and functional diagram.
How is output voltage tracking implemented on the LTC3546IFE#PBF?
Output voltage tracking on the LTC3546IFE#PBF is implemented via the TRACK/SS1 and TRACK/SS2 pins. When an external voltage ramp (e.g., from another regulator's output) is applied to these pins, the corresponding VOUT1 or VOUT2 follows that ramp with minimal offset (15mV typical). If left floating, each channel uses an internal 1.2ms soft-start; if a capacitor is connected, a 1.15µA internal current source charges it to generate a custom ramp - all without external op-amps or complex circuitry.
What thermal considerations apply to the LTC3546IFE#PBF in its TSSOP package?
The LTC3546IFE#PBF in the 28-lead TSSOP package has θJA = 25°C/W and requires the exposed pad (Pin 29 = GNDD) to be soldered to a PCB thermal pad for rated performance. Without proper pad connection, junction temperature rise exceeds specification limits under full load. The device includes thermal shutdown at TJ = 125°C, but sustained operation above 100°C degrades long-term reliability - hence thermal vias and copper pour under the exposed pad are mandatory for 3A output capability.
Can the LTC3546IFE#PBF synchronize to an external clock, and what are the interface requirements?
Yes, the LTC3546IFE#PBF can synchronize to an external clock via the SYNC/MODE pin. When an external square wave (1.5V to 5.5V amplitude, 0.75–4MHz range) is applied, the internal PLL locks to it, forcing pulse-skipping mode. No external components are needed beyond AC coupling if DC bias differs from the device's logic levels. The FREQ pin must be left unconnected or tied to GNDA during synchronization to avoid conflict with internal oscillator programming.
LTC3546IFE#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
LTC3546IFE#PBF FAQ
1.How can I place an order for LTC3546IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3546IFE#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 LTC3546IFE#PBF reliable?
The price and inventory of LTC3546IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3546IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3546IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3546IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3546IFE#PBF?
LTC3546IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3546IFE#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 LTC3546IFE#PBF?
For technical support, including LTC3546IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3546IFE#PBF requirements.
6.How does Aetrix verify that LTC3546IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3546IFE#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 LTC3546IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3546IFE#PBF?
All LTC3546IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3546IFE#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 LTC3546IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3546IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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