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Analog Devices Inc. LTC3547BEDDB#TRPBF
- Part No.:
- LTC3547BEDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3547BEDDB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA DL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,892
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Product details
Overview
LTC3547BEDDB#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, monolithic, synchronous step-down DC/DC converter in an 8-lead 3mm × 2mm DFN package. It delivers up to 300mA per channel across 2.5V–5.5V input, features 2.25MHz fixed-frequency operation, 0.6V feedback reference, and 100% duty cycle for low-dropout battery operation - ideal for Li-ion-powered portable media players and digital still cameras.
For engineers reviewing the LTC3547BEDDB#TRPBF datasheet, LTC3547BEDDB#TRPBF pinout, LTC3547BEDDB#TRPBF application, or LTC3547BEDDB#TRPBF equivalent, key selection criteria include dual independent enable (RUN1/RUN2), internal compensation for ceramic output capacitors, ±1.2% VFB regulation accuracy over temperature, ultralow 1μA shutdown current, and thermal performance validated for –40°C to 85°C operation.
Technical Context
The LTC3547BEDDB#TRPBF employs constant-frequency current-mode control with synchronized in-phase switching at 2.25MHz. Each channel uses independent P-channel high-side and N-channel low-side MOSFETs with RDS(ON) of 0.8Ω (top) and 0.75Ω (bottom) at VIN = 3.6V, enabling fast transient response and stable regulation under load steps from 0mA to 300mA.
It integrates soft-start (650μs ramp time), short-circuit protection via extended bottom-switch conduction, and dropout operation down to VIN – VOUT ≈ IOUT × RDS(ON). Feedback pins (VFB1/VFB2) regulate to 0.6V with ±1.2% total error over –40°C to 85°C, supporting adjustable outputs via external resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion polymer and USB 5V bus without pre-regulation. |
| Output Current per Channel | 300mA continuous - sufficient for core logic rails in portable media players and DSL modems. |
| Switching Frequency | 2.25MHz (±25%) - enables use of 4.7μH inductors and compact 4.7μF ceramic output capacitors. |
| Feedback Reference Voltage | 0.6V ±1.2% - allows precise low-voltage outputs (e.g., 1.2V, 1.8V, 2.5V) with minimal divider current. |
| Shutdown Supply Current | <1μA - extends battery life during system sleep in cellular telephones and PDAs. |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
| Peak Switch Current Limit | 550mA per channel - provides robust short-circuit protection without external current sensing. |
Pinout & Package
Package: 8-lead 3mm × 2mm plastic DFN (DDB), 0.75mm profile, exposed pad (Pin 9) electrically connected to GND and required to be soldered to PCB for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Regulator 1 feedback input | Connects to resistor divider on VOUT1; regulates to 0.6V reference for adjustable output voltage. |
| RUN1 (Pin 2) | Regulator 1 enable control | High ≥1.2V enables channel 1; low ≤0.4V disables with <1μA leakage current. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 4.7μF ceramic decoupling to GND (Pin 5). |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor L1; swings between VIN and GND; requires tight layout to minimize EMI. |
| GND (Pin 5) | Power and signal ground | Common return for CIN, COUT, and exposed pad; must be low-impedance plane. |
| SW2 (Pin 6) | Channel 2 switch node | Independent switch node for second regulator; routed separately from SW1 to avoid crosstalk. |
| RUN2 (Pin 7) | Regulator 2 enable control | Functionally identical to RUN1; enables independent power sequencing of dual rails. |
| VFB2 (Pin 8) | Regulator 2 feedback input | Identical to VFB1; supports independent output voltage setting for VOUT2. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent soft-start | 650μs typical ramp time per channel - prevents inrush current into output capacitors during power-up. |
| Internal compensation | Stable with all-ceramic output capacitors - eliminates need for ESR-based compensation networks. |
| 100% duty-cycle operation | Enables dropout mode down to VIN – VOUT ≈ 240mV @ 300mA - maximizes usable battery voltage range. |
| No external Schottky diodes | Synchronous rectification with integrated N-channel MOSFET - improves efficiency by ~5% vs. diode-based buck. |
| Short-circuit protection | Automatic frequency reduction and bottom-FET extension - limits peak current and prevents thermal runaway. |
Applications
| Portable Media Players | Digital Still Cameras |
|---|---|
Use Scenario: Dual-rail power for image sensor (1.8V) and baseband processor (2.5V) in compact handheld devices. IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing independently enabled, low-noise, high-efficiency DC/DC conversion. Use Value: 96% peak efficiency at 300mA reduces thermal load in sealed enclosures; 2.25MHz switching avoids audible noise in audio subsystems. |
Use Scenario: Powering CMOS image sensor (1.2V) and ISP (1.8V) with fast transient response during burst capture. IC Role / Device Role / Timing Role: Dual monolithic buck converter delivering tightly regulated, low-ripple supplies with independent RUN control. Use Value: Independent soft-start prevents supply interaction during camera wake-up; 0.6V reference enables accurate low-voltage rail generation. |
| Wireless Modems | PDAs / Palmtop PCs |
Use Scenario: Generating 1.8V RF transceiver and 3.3V baseband rails from single Li-ion cell in compact modem modules. IC Role / Device Role / Timing Role: Dual step-down regulator with wide 2.5V–5.5V input range and low quiescent current for always-on connectivity. Use Value: 1μA shutdown current preserves battery during idle; 8-lead DFN footprint saves board space in mini-PCIe and M.2 form factors. |
Use Scenario: Powering ARM application processor core (1.2V) and I/O (1.8V) in legacy palmtop systems with constrained PCB area. IC Role / Device Role / Timing Role: Compact dual buck IC replacing discrete solutions to meet strict height (<0.75mm) and thermal requirements. Use Value: Exposed-pad DFN package achieves θJA = 76°C/W - maintains junction temperature below 125°C at full load in 70°C ambient. |
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 |
|---|---|---|---|
| TPS62231DRYT | Single-output 300mA buck; 3MHz switching; 0.6V reference; no dual-channel capability. | Requires two separate ICs to replicate dual-rail functionality - increases BOM count and layout area. | Select only when single-rail design suffices or when higher 3MHz frequency justifies added complexity. |
| MAX17504ATP+T | Dual 600mA buck; 400kHz–2.2MHz programmable frequency; external compensation; larger 16-pin TQFN. | Higher current and flexibility but requires external loop compensation components and occupies >2× PCB area. | Prefer for high-current or frequency-tunable designs where layout space and component count are secondary concerns. |
Compared with TPS62231DRYT and MAX17504ATP+T, the LTC3547BEDDB#TRPBF uniquely delivers dual 300mA channels in a space-constrained 3mm × 2mm DFN with zero external compensation - optimizing for minimal footprint, lowest component count, and guaranteed stability in portable Li-ion applications.
Availability
LTC3547BEDDB#TRPBF is available at Aetrix Electronics and suitable for portable media players, digital still cameras, and wireless modems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3547BEDDB#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 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3547B belongs to Linear's monolithic synchronous buck regulator family, designed specifically for space- and efficiency-critical portable electronics powered by single-cell Li-ion or USB sources.
FAQ
What is the maximum output current per channel for the LTC3547BEDDB#TRPBF?
The LTC3547BEDDB#TRPBF delivers up to 300mA continuous output current per channel across its full operating temperature range (–40°C to +85°C), verified under VIN = 3V and typical PCB thermal conditions. Peak current limit is 550mA per channel, providing headroom for transient loads without foldback.
Does the LTC3547BEDDB#TRPBF require external compensation components?
No, the LTC3547BEDDB#TRPBF is internally compensated and fully stable with ceramic output capacitors - no external Type II or Type III compensation network is needed. This simplifies design and eliminates tuning effort while maintaining phase margin >45° across load and input variations.
What is the shutdown current specification for the LTC3547BEDDB#TRPBF?
The LTC3547BEDDB#TRPBF draws less than 1μA total supply current in shutdown mode (RUN1 = RUN2 = GND, VIN = 5.5V), enabling multi-week battery standby in portable systems. This ultra-low IQ is guaranteed over the full –40°C to +85°C temperature range.
Can the LTC3547BEDDB#TRPBF operate in dropout mode, and what is the minimum input-to-output voltage difference?
Yes, the LTC3547BEDDB#TRPBF supports 100% duty-cycle operation for dropout mode. At 300mA load and 2.7V input, the typical VIN–VOUT drop is ~240mV due to RDS(ON) of the P-channel switch, extending usable battery life down to ~2.75V for a 2.5V output rail.
What package type and thermal characteristics does the LTC3547BEDDB#TRPBF use?
The LTC3547BEDDB#TRPBF uses an 8-lead 3mm × 2mm plastic DFN (DDB) package with exposed GND pad. Its thermal resistance is θJA = 76°C/W when properly soldered to a 1-in² 2-oz copper pad, enabling reliable operation at full 300mA/channel load in 70°C ambient without forced airflow.
LTC3547BEDDB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN 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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 300mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC3547BEDDB#TRPBF FAQ
1.How can I place an order for LTC3547BEDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3547BEDDB#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 LTC3547BEDDB#TRPBF reliable?
The price and inventory of LTC3547BEDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3547BEDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3547BEDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3547BEDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3547BEDDB#TRPBF?
LTC3547BEDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3547BEDDB#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 LTC3547BEDDB#TRPBF?
For technical support, including LTC3547BEDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3547BEDDB#TRPBF requirements.
6.How does Aetrix verify that LTC3547BEDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3547BEDDB#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 LTC3547BEDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3547BEDDB#TRPBF?
All LTC3547BEDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3547BEDDB#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 LTC3547BEDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC3547BEDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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