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Analog Devices Inc. LTC3547BIDDB#TRPBF
- Part No.:
- LTC3547BIDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3547BIDDB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA DL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,961
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Product details
Overview
LTC3547BIDDB#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, 2.25MHz synchronous step-down DC/DC regulator in an 8-lead 3mm × 2mm DFN package. It delivers up to 300mA per channel across 2.5V–5.5V input, features 0.6V feedback reference, 100% duty cycle for low-dropout operation, and supports Li-ion/USB-powered portable systems.
For engineers reviewing the LTC3547BIDDB#TRPBF datasheet, LTC3547BIDDB#TRPBF pinout, LTC3547BIDDB#TRPBF application, or LTC3547BIDDB#TRPBF equivalent, this page provides verified electrical specs, thermal behavior at 125°C junction limit, dual independent soft-start timing, ceramic-capacitor compatibility, and fixed/flexible output configuration support.
Technical Context
The LTC3547BIDDB#TRPBF uses constant-frequency current-mode control with synchronized in-phase switching across both channels. Its architecture integrates P-channel high-side and N-channel low-side MOSFETs with RDS(ON) of 0.8Ω (top) and 0.75Ω (bottom) at 3.6V, enabling high-efficiency regulation down to 0.6V via external resistor dividers or internal fixed-ratio networks.
Each channel operates independently with dedicated RUN and VFB pins, supporting individual enable/disable and output voltage setting. The device transitions automatically to pulse-skip mode under light load and includes short-circuit protection that reduces switching frequency during fault conditions without latch-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion polymer and USB 2.0/3.0 bus power rails |
| Output Current per Channel | 300mA continuous - sufficient for core logic, memory I/O, and RF subsystems in compact portable devices |
| Switching Frequency | 2.25MHz (±25%) - enables use of sub-5mm surface-mount inductors and minimizes EMI filtering footprint |
| Feedback Reference Voltage | 0.6V ±1.7% - allows precise low-voltage outputs (e.g., 1.2V, 1.8V) with minimal divider current (<5μA) |
| Shutdown Quiescent Current | <1μA - extends battery life in standby modes for handheld and always-on sensor nodes |
| Operating Temperature Range | –40°C to +125°C - qualified for industrial and extended-temperature embedded applications |
| Peak Switch Current Limit | 550mA per channel - provides margin above 300mA rated output while limiting inductor saturation risk |
| Thermal Resistance θJA | 76°C/W - requires exposed pad soldered to PCB ground plane for reliable 125°C junction operation |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with 0.75mm profile and exposed GND pad (Pin 9).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Regulator 1 feedback input | Connects to resistor divider on VOUT1; regulated to 0.6V for output voltage setting |
| RUN1 (Pin 2) | Regulator 1 enable control | High = active; low = shutdown; threshold 0.4–1.2V; leakage <1μA |
| VIN (Pin 3) | Main power input | Supplies both channels; must be decoupled within 2mm of Pin 3 and Pin 5 with ≥10μF ceramic |
| SW1 (Pin 4) | Regulator 1 switch node | Connects to inductor; swings between VIN and GND; requires tight loop 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) | Regulator 2 switch node | Independent switch node for second channel; identical routing requirements as SW1 |
| RUN2 (Pin 7) | Regulator 2 enable control | Functionally identical to RUN1; enables independent sequencing of dual outputs |
| VFB2 (Pin 8) | Regulator 2 feedback input | Identical function to VFB1; supports separate output voltage programming |
| Exposed Pad (Pin 9) | Thermal and electrical GND | Must be soldered to PCB ground plane; critical for thermal performance and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent soft-start | 0.65ms typical ramp time per channel - prevents inrush current into large output capacitors |
| Internal compensation | Stable with all-ceramic output capacitors - eliminates need for ESR-based damping networks |
| 100% duty cycle operation | Enables dropout mode down to VOUT = VIN – (IOUT × RDS(ON)) - extends runtime in battery-depleted states |
| No external Schottky diodes | Synchronous rectification with integrated N-channel bottom switch - improves efficiency by ~5% vs diode-based designs |
| Short-circuit foldback | Reduces switching frequency during output short - limits power dissipation and enables self-recovery |
| Burst Mode® compatibility | Supports optional light-load efficiency optimization via external control - not enabled by default in LTC3547B |
Applications
| Cellular Telephones | Digital Still Cameras |
|---|---|
Use Scenario: Dual-rail power for baseband processor (1.2V) and image sensor interface (1.8V) in slim handset form factor. IC Role / Device Role / Timing Role: Primary dual-output buck regulator delivering regulated, sequenced power with <1μA shutdown current. Use Value: Enables >100-hour standby via ultra-low quiescent current and maintains stable rail separation during RF transmit bursts. |
Use Scenario: Power management for CMOS image sensor (2.8V analog, 1.8V digital) and SD card interface (3.3V) in compact camera modules. IC Role / Device Role / Timing Role: Dual synchronous buck converter supplying independent, low-noise outputs with fast transient response. Use Value: Supports burst capture mode with <100μs recovery from 0–300mA load steps and maintains sensor SNR via low-output-ripple design. |
| Wireless Modems | Portable Media Players |
Use Scenario: Compact power solution for LTE/Wi-Fi combo module requiring 1.2V core, 1.8V I/O, and 3.3V RF bias rails. IC Role / Device Role / Timing Role: Dual adjustable buck regulator with independent RUN controls for staggered power-up of modem subsystems. Use Value: Reduces BOM count by replacing two discrete converters; supports dynamic voltage scaling during data transmission. |
Use Scenario: Dual-regulated supply for audio CODEC (1.2V), NAND flash controller (1.8V), and display driver (3.3V) in battery-powered players. IC Role / Device Role / Timing Role: High-efficiency dual buck IC operating from single Li-ion cell with 100% duty cycle during discharge. Use Value: Extends playback time by >15% versus legacy solutions due to 96% peak efficiency and <1μA shutdown draw. |
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 |
|---|---|---|---|
| TPS62125DSCR | Single-channel, 3MHz, 300mA; no dual output or independent RUN pins | Requires two units for dual-rail design; lacks channel synchronization | Select when only one regulated rail is needed and board space permits duplication |
| MAX17504ATP+T | Dual-channel, 2.2MHz, 600mA/channel; larger 4mm × 4mm TQFN; higher IQ (12μA) | Higher current capability but consumes 78% more PCB area and draws 12× more shutdown current | Select when >300mA per rail is required and thermal budget allows larger package |
Compared with TPS62125DSCR and MAX17504ATP+T, the LTC3547BIDDB#TRPBF uniquely combines dual 300mA channels, 8-pin 3mm × 2mm footprint, <1μA shutdown, and independent soft-start in a single industrial-temp-grade device - making it optimal for space-constrained, battery-sensitive dual-rail systems.
Availability
LTC3547BIDDB#TRPBF is available at Aetrix Electronics and suitable for cellular telephones, digital still cameras, and wireless modems requiring stable component supply with guaranteed long-term industrial temperature support.
Supply support for LTC3547BIDDB#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 precision power management portfolio, emphasizing high-efficiency, low-noise, and thermally robust DC/DC solutions for portable and industrial markets.
The LTC3547BIDDB#TRPBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for space-constrained, battery-powered applications demanding dual independent outputs, ultra-low quiescent current, and seamless integration with ceramic capacitors.
FAQ
What is the maximum junction temperature specification for the LTC3547BIDDB#TRPBF?
The LTC3547BIDDB#TRPBF has a maximum junction temperature of 125°C. Thermal shutdown activates above ~150°C to protect the die, but sustained operation must remain ≤125°C. With θJA = 76°C/W and proper exposed-pad soldering, the LTC3547BIDDB#TRPBF achieves safe operation at full 300mA per channel in 70°C ambient - verified by thermal characterization in the datasheet.
Does the LTC3547BIDDB#TRPBF support fixed-output voltage configurations?
Yes, the LTC3547BIDDB#TRPBF supports adjustable outputs via external resistive dividers on VFB1/VFB2, but fixed-output variants like LTC3547B-1 (1.8V/1.2V) exist. The LTC3547BIDDB#TRPBF itself is the adjustable version - its feedback pins require external resistors to set VOUT, unlike the -1 suffix parts which embed internal dividers.
Can the LTC3547BIDDB#TRPBF operate with ceramic capacitors only?
Yes, the LTC3547BIDDB#TRPBF is internally compensated for stability with all-ceramic input and output capacitors. Unlike older buck controllers, it does not rely on capacitor ESR for loop compensation - enabling low-ESR, high-ripple-current X5R/X7R ceramics without phase-margin degradation.
What is the purpose of the exposed pad (Pin 9) on the LTC3547BIDDB#TRPBF?
The exposed pad (Pin 9) on the LTC3547BIDDB#TRPBF is electrically connected to GND and serves as the primary thermal path. It must be soldered to a PCB ground plane to achieve the specified θJA = 76°C/W. Omitting this connection raises junction temperature by >30°C at full load and risks thermal shutdown or reliability degradation.
How does the LTC3547BIDDB#TRPBF handle short-circuit conditions?
Under short-circuit, the LTC3547BIDDB#TRPBF reduces switching frequency per channel by extending bottom-switch conduction time - limiting peak current and dissipating less power than hard-current-limit designs. Recovery is automatic once the fault clears; no latch-off or external reset is needed. This behavior is confirmed in the functional diagram and transient test waveforms.
LTC3547BIDDB#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):
- 6.5V
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC3547BIDDB#TRPBF FAQ
1.How can I place an order for LTC3547BIDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3547BIDDB#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 LTC3547BIDDB#TRPBF reliable?
The price and inventory of LTC3547BIDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3547BIDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3547BIDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3547BIDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3547BIDDB#TRPBF?
LTC3547BIDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3547BIDDB#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 LTC3547BIDDB#TRPBF?
For technical support, including LTC3547BIDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3547BIDDB#TRPBF requirements.
6.How does Aetrix verify that LTC3547BIDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3547BIDDB#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 LTC3547BIDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3547BIDDB#TRPBF?
All LTC3547BIDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3547BIDDB#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 LTC3547BIDDB#TRPBF part is unused and in its original packaging.
Return procedure for LTC3547BIDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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