My Inquiry
My Account
Analog Devices Inc. LTC3547BIDDB#TRMPBF
- Part No.:
- LTC3547BIDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3547BIDDB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA DL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:279
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3547BIDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a dual-channel, 2.25MHz synchronous step-down DC/DC converter in an 8-lead 3mm × 2mm DFN package. It delivers up to 300mA per channel with 0.6V feedback reference, 2.5V–5.5V input range, and 100% duty cycle for low-dropout operation-designed for Li-ion-powered portable electronics requiring compact, high-efficiency dual-rail regulation.
For engineers reviewing the LTC3547BIDDB#TRMPBF datasheet, LTC3547BIDDB#TRMPBF pinout, LTC3547BIDDB#TRMPBF application, or LTC3547BIDDB#TRMPBF equivalent, key selection criteria include guaranteed –40°C to 125°C operation, independent soft-start per channel, internal compensation for ceramic output capacitors, and absence of external Schottky diodes.
Technical Context
The LTC3547BIDDB#TRMPBF employs constant-frequency current-mode control with synchronized 2.25MHz switching across both channels. Each regulator uses P-channel high-side and N-channel low-side MOSFETs with typical RDS(ON) of 0.8Ω (top) and 0.75Ω (bottom) at 3.6V input, enabling efficient operation down to 0.6V output via external resistor dividers.
It features independent RUN pins (RUN1/RUN2), separate VFB inputs (VFB1/VFB2), and integrated short-circuit protection that reduces switching frequency during fault conditions. The device supports pulse-skip mode at light loads and includes overtemperature shutdown at ~150°C junction temperature.
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 5V supply rails |
| Output Current per Channel | 300mA continuous - sufficient for core logic and I/O rails in handheld devices |
| Switching Frequency | 2.25MHz (typ) - enables use of sub-5mm surface-mount inductors and compact ceramic capacitors |
| Feedback Reference Voltage | 0.6V ±1.7% - allows precise low-voltage outputs (e.g., 1.2V, 1.8V) with standard resistor ratios |
| Shutdown Quiescent Current | <1μA - extends battery life during system sleep modes |
| Operating Temperature Range | –40°C to +125°C - qualified for industrial and extended-temperature embedded applications |
| Efficiency (Typical) | 96% at 300mA, VIN=3.6V, VOUT=1.8V - minimizes thermal load in space-constrained PCB layouts |
Pinout & Package
Package: 8-lead 3mm × 2mm plastic DFN (0.75mm height), exposed pad (Pin 9) electrically connected to GND and required to be soldered to PCB for thermal performance.
| 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 | Pull to VIN to activate Channel 1; pull to GND to disable with <1μA leakage |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 4.7μF ceramic decoupling to GND |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; high dv/dt node requiring tight layout |
| GND (Pin 5) | Power and signal ground | Return path for CIN, COUT, and exposed pad; must be low-impedance plane |
| SW2 (Pin 6) | Channel 2 switch node | Independent switch node for second buck stage; identical electrical behavior to SW1 |
| RUN2 (Pin 7) | Regulator 2 enable control | Independent enable for Channel 2; no cross-talk with RUN1 |
| VFB2 (Pin 8) | Regulator 2 feedback input | Separate feedback path for VOUT2; enables independent voltage programming |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables dropout regulation down to VOUT = VIN − IOUT×RDS(ON), critical for battery end-of-life support |
| Internal compensation | Eliminates need for external compensation components when using ceramic output capacitors |
| Independent soft-start | Each channel ramps output over ~650μs to limit inrush current into output capacitance |
| No external Schottky diodes | Synchronous rectification reduces conduction losses and eliminates diode forward voltage drop |
| Short-circuit protection | Reduces switching frequency during output short, limiting peak current and thermal stress |
Applications
| Mobile Baseband Processor Power | Digital Camera Core Logic Supply |
|---|---|
Use Scenario: Dual-rail power for application processor (1.2V core) and I/O interface (1.8V) in smartphone mainboard. IC Role / Device Role / Timing Role: Primary dual-output buck regulator delivering stable, low-noise DC rails with independent enable control. Use Value: Enables simultaneous power sequencing and independent rail shutdown to meet dynamic power management requirements. | Use Scenario: Powering image sensor interface and JPEG encoder ASIC in compact digital still camera. IC Role / Device Role / Timing Role: Compact dual-step-down converter supplying 1.8V and 2.5V from single Li-ion cell. Use Value: 3mm × 2mm footprint and 0.75mm height allow integration in ultra-thin camera modules without thermal derating. |
| Wireless Modem RF Front-End Bias | Industrial Handheld Terminal Display Backlight Driver Support |
Use Scenario: Generating clean 1.2V and 1.8V supplies for LTE/Wi-Fi baseband ICs and transceivers in DSL/wireless modems. IC Role / Device Role / Timing Role: High PSRR dual regulator providing noise-isolated rails adjacent to sensitive RF circuitry. Use Value: 2.25MHz switching moves switching noise beyond RF receive bands, reducing conducted EMI filtering burden. | Use Scenario: Supporting LED driver IC bias rails (1.8V logic, 2.5V analog) in ruggedized industrial PDAs operating at –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Industrial-grade dual buck regulator with guaranteed 125°C junction rating and robust thermal design. Use Value: Extended temperature qualification ensures reliable startup and regulation under cold-start and high-ambient conditions. |
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 |
|---|---|---|---|
| TPS62400DRVR | 2.25MHz fixed-frequency, 600mA per channel, 2.5V–6V input, 0.6V reference; smaller 2mm × 2mm WSON package | Higher output current but lacks independent RUN pins and has different pinout | Select when higher current headroom is needed and board layout permits rework for non-pin-compatible footprint |
| MAX17504ATP+T | 2.2MHz, 4A per channel, 4.5V–28V input, 0.6V reference; requires external compensation and Schottky diodes | Designed for wide-input industrial systems-not suitable for Li-ion or USB-powered portable designs | Choose only for high-voltage, high-current applications where LTC3547BIDDB#TRMPBF's input range and size are insufficient |
Compared with TPS62400DRVR and MAX17504ATP+T, the LTC3547BIDDB#TRMPBF offers optimal balance of miniature size, dual independent control, and Li-ion compatibility-making it uniquely suited for space- and battery-constrained portable electronics where thermal and layout constraints dominate.
Availability
LTC3547BIDDB#TRMPBF is available at Aetrix Electronics and suitable for mobile computing, wireless communications, and industrial handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3547BIDDB#TRMPBF 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 legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LTC3547B series was designed specifically for dual-rail, battery-powered portable electronics-emphasizing ultra-small footprint, high efficiency at light loads, and seamless integration with ceramic capacitors and miniature inductors.
FAQ
What is the maximum junction temperature specification for the LTC3547BIDDB#TRMPBF?
The LTC3547BIDDB#TRMPBF has a maximum junction temperature of 125°C. Thermal shutdown activates at approximately 150°C to protect the device during overload or poor heatsinking conditions. The DFN package exhibits θJA ≈ 76°C/W when properly soldered to a 4-layer PCB with thermal vias under the exposed pad, enabling reliable operation up to 125°C ambient in typical applications.
Does the LTC3547BIDDB#TRMPBF require external compensation components?
No, the LTC3547BIDDB#TRMPBF is internally compensated and fully stable with ceramic output capacitors-no external compensation network is needed. This simplifies design and reduces bill-of-materials cost. However, optional feedback capacitors (CF1/CF2) may be added to improve transient response if required by specific load dynamics.
Can the LTC3547BIDDB#TRMPBF operate with a 2.5V input and 1.8V output at full 300mA load?
Yes, the LTC3547BIDDB#TRMPBF supports 2.5V input and 1.8V output at 300mA per channel. At this condition, the duty cycle approaches 72%, well within the 100% capability. Efficiency remains above 85% based on typical performance curves, and thermal rise stays within safe limits when using recommended PCB layout practices.
What is the purpose of the exposed pad (Pin 9) on the LTC3547BIDDB#TRMPBF DFN package?
The exposed pad (Pin 9) on the LTC3547BIDDB#TRMPBF is electrically connected to GND and serves as the primary thermal path from the die to the PCB. It must be soldered to a solid copper thermal pad with ≥4 thermal vias to ensure adequate heat dissipation and maintain junction temperature below 125°C under full-load operation.
How does the LTC3547BIDDB#TRMPBF handle light-load efficiency compared to burst-mode alternatives?
The LTC3547BIDDB#TRMPBF transitions to pulse-skip mode at light loads to reduce switching losses, but does not implement true Burst Mode® operation. As a result, light-load efficiency is lower than dedicated Burst Mode regulators like the LTC3547. For applications demanding highest efficiency below 1mA, consider the LTC3547 or evaluate adding external enable control to gate the RUN pins during idle periods.
LTC3547BIDDB#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC3547BIDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3547BIDDB#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC3547BIDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3547BIDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3547BIDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3547BIDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3547BIDDB#TRMPBF?
LTC3547BIDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3547BIDDB#TRMPBF 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#TRMPBF?
For technical support, including LTC3547BIDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3547BIDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC3547BIDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3547BIDDB#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3547BIDDB#TRMPBF?
All LTC3547BIDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3547BIDDB#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3547BIDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3547BIDDB#TRMPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
