My Inquiry
My Account
Analog Devices Inc. LTC3547BEDDB-1#TRMPBF
- Part No.:
- LTC3547BEDDB-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3547BEDDB-1#TRMPBF.pdf
- Description:
- IC REG BUCK 1.2/1.8V 300MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,579
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3547BEDDB-1#TRMPBF from Analog Devices (formerly Linear Technology) is a dual-channel, monolithic synchronous step-down DC/DC regulator in an 8-lead 3mm × 2mm DFN package. It delivers up to 300mA per channel with fixed output voltages of 1.8V (Channel 1) and 1.2V (Channel 2), operates from 2.5V to 5.5V input, achieves up to 96% efficiency, and features 2.25MHz constant-frequency current-mode control for compact Li-ion–powered portable electronics.
For engineers reviewing the LTC3547BEDDB-1#TRMPBF datasheet, LTC3547BEDDB-1#TRMPBF pinout, LTC3547BEDDB-1#TRMPBF application, or LTC3547BEDDB-1#TRMPBF equivalent, key selection criteria include fixed dual-output voltage assignment, 100% duty-cycle low-dropout operation, internal compensation for ceramic capacitors, independent soft-start per channel, and thermal performance in ultra-thin DFN packages.
Technical Context
The LTC3547BEDDB-1#TRMPBF implements two identical current-mode synchronous buck regulators sharing a 2.25MHz oscillator and operating in-phase. Each channel uses internal P-channel and N-channel MOSFETs with RDS(ON) of 0.8Ω (top) and 0.75Ω (bottom) at VIN = 3.6V, and regulates via a 0.6V reference with internal resistor dividers set for 1.8V and 1.2V outputs.
It supports ultralow quiescent current (<1μA in shutdown), independent RUN1/RUN2 enable inputs, short-circuit protection via extended bottom-switch conduction, and pulse-skipping mode below ~10mA load to maintain light-load efficiency - all without external compensation components.
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 without external regulation. |
| Output Voltages | Fixed 1.8V (CH1) and 1.2V (CH2) - eliminates external feedback resistors and layout sensitivity for space-constrained designs. |
| Max Output Current | 300mA per channel - sufficient for powering core logic, memory I/O, and low-power peripherals in portable systems. |
| Switching Frequency | 2.25MHz (typ) - enables use of sub-5mm surface-mount inductors (e.g., 4.7μH) and small ceramic capacitors (e.g., 4.7μF). |
| Efficiency | Up to 96% at 300mA - achieved via synchronous rectification, low RDS(ON) switches, and optimized gate drive. |
| Shutdown Current | <1μA - extends battery life during system sleep modes in always-on portable devices. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
| Package | 8-lead 3mm × 2mm × 0.75mm DFN with exposed pad - provides low thermal resistance (θJA = 76°C/W) when soldered to PCB ground plane. |
Pinout & Package
Package: 8-lead plastic DFN (3mm × 2mm, 0.75mm height) with exposed GND pad (Pin 9), RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Internally connected to 1.8V divider; must be tied directly to VOUT1 - no external resistors required. |
| RUN1 (Pin 2) | Channel 1 enable input | Logic-high (>0.4V) enables CH1; logic-low (<0.1V) places CH1 in ultralow-IQ shutdown. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 4.7μF ceramic decoupling to GND (Pin 5) with minimal trace length. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor L1; swings between VIN and GND; high di/dt node requiring tight loop area with L1 and COUT1. |
| GND (Pin 5) | Power and signal ground | Common return for CIN, COUT, and exposed pad; must be solidly connected to PCB ground plane. |
| SW2 (Pin 6) | Channel 2 switch node | Connects to inductor L2; functionally identical to SW1 but isolated for independent layout routing. |
| RUN2 (Pin 7) | Channel 2 enable input | Independent control of CH2; allows staggered startup or dynamic power gating of subsystems. |
| VFB2 (Pin 8) | Channel 2 feedback input | Internally connected to 1.2V divider; must be tied directly to VOUT2 - no external resistors required. |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-output configuration | Eliminates external feedback networks for 1.8V/1.2V rails - reduces BOM count, layout area, and tuning risk in space-limited designs. |
| 100% duty-cycle operation | Enables dropout regulation down to VIN – VOUT ≈ 100mV at 300mA - critical for maximizing runtime near end-of-battery discharge. |
| Internal compensation | Stable with all-ceramic output capacitors (≥4.7μF X5R/X7R); removes need for ESR-dependent tantalum or polymer caps. |
| Independent soft-start | ~650μs ramp time per channel - prevents inrush current on individual rails during sequenced power-up. |
| Short-circuit protection | Automatic frequency reduction and bottom-FET extension during overload - avoids thermal runaway without external circuitry. |
| Ultralow shutdown IQ | <1μA total device current - enables multi-week shelf life in battery-backed IoT sensors and wearables. |
Applications
| Mobile Baseband Power | Digital Camera Core Logic |
|---|---|
|
Use Scenario: Dual-rail power for 3G/4G baseband processors requiring 1.8V I/O and 1.2V core voltage in smartphones. IC Role / Device Role / Timing Role: Primary dual-output buck regulator delivering regulated, sequenced, low-noise DC power to SoC domains. Use Value: Fixed outputs eliminate trimming overhead; 2.25MHz switching avoids AM radio band interference; DFN footprint saves board area in <10mm² camera modules. |
Use Scenario: Power management for CMOS image sensor interface and ISP processing in compact digital still cameras. IC Role / Device Role / Timing Role: Dual synchronous buck supplying clean 1.8V (sensor I/O) and 1.2V (ISP core) with independent enable control. Use Value: Independent RUN pins allow sensor wake-up before ISP activation; 96% peak efficiency minimizes thermal impact on optical alignment. |
| USB-Powered Modem | Portable Media Player SoC |
|
Use Scenario: Compact power solution for LTE/Wi-Fi modems drawing 250mA on each rail from 5V USB input. IC Role / Device Role / Timing Role: Dual buck converter stepping 5V USB down to 1.8V (PHY) and 1.2V (MAC processor) with low EMI. Use Value: 2.25MHz operation enables tiny 2.0×1.6mm inductors; internal compensation ensures stability with low-ESR ceramic caps across temperature. |
Use Scenario: Powering audio codec, flash memory, and display controller in battery-operated MP3/MP4 players. IC Role / Device Role / Timing Role: Dual-output regulator supporting 1.8V memory I/O and 1.2V DSP core with low quiescent current in standby. Use Value: <1μA shutdown current extends playback time between charges; 100% duty cycle maintains output during battery sag to 2.7V. |
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 |
|---|---|---|---|
| TPS62231DRYT | Single 1.8V output (not dual); 3MHz switching; 300mA rating; 2.05V–6.5V input range. | Requires two separate ICs to replicate dual-rail functionality; higher fSW demands tighter layout control. | Select only if 1.8V-only rail is sufficient and board space allows duplication; not a functional replacement for LTC3547BEDDB-1#TRMPBF's integrated dual fixed outputs. |
| RT8059NGQW | Dual adjustable outputs (not fixed); 2.5MHz; 600mA per channel; 2.5V–5.5V input; requires external feedback resistors. | Supports flexible voltage assignment but adds BOM cost, layout complexity, and calibration uncertainty vs. factory-trimmed fixed outputs. | Choose when system requires non-standard voltages (e.g., 1.5V/1.0V); avoid if 1.8V/1.2V is mandatory and space/efficiency are constrained. |
Compared with TPS62231DRYT and RT8059NGQW, the LTC3547BEDDB-1#TRMPBF uniquely integrates factory-set 1.8V/1.2V outputs in one DFN package with no external resistors, enabling smaller footprint, faster design-in, and guaranteed output accuracy - making it optimal for high-volume portable electronics where dual-rail simplicity and reliability are prioritized.
Availability
LTC3547BEDDB-1#TRMPBF is available at Aetrix Electronics and suitable for mobile baseband power, digital camera core logic, USB-powered modem, and portable media player SoC applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for LTC3547BEDDB-1#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 continues its legacy of high-performance power management ICs with precision analog integration, robust reliability, and application-focused design.
The LTC3547B product line targets ultra-compact, high-efficiency dual-rail DC/DC conversion for battery-powered portable electronics - emphasizing fixed-output simplicity, minimal external components, and thermal efficiency in sub-3mm² packages.
FAQ
What are the fixed output voltages of the LTC3547BEDDB-1#TRMPBF?
The LTC3547BEDDB-1#TRMPBF has factory-trimmed fixed outputs: Channel 1 delivers 1.8V and Channel 2 delivers 1.2V. These values are set by internal resistor dividers - no external resistors are needed, and VFB1/VFB2 pins must be connected directly to their respective output nodes. The 0.6V internal reference ensures ±1.2% output accuracy over temperature and line conditions.
Does the LTC3547BEDDB-1#TRMPBF require external compensation components?
No, the LTC3547BEDDB-1#TRMPBF is fully internally compensated and stable with standard 4.7μF ceramic output capacitors (X5R/X7R dielectric). This eliminates external compensation networks, simplifies layout, and guarantees stability across operating conditions - unlike adjustable buck regulators that require careful RC network design for phase margin control.
What is the maximum continuous output current per channel for the LTC3547BEDDB-1#TRMPBF?
The LTC3547BEDDB-1#TRMPBF delivers up to 300mA continuous output current per channel under typical conditions (TA = 25°C, VIN = 3.6V). Derating applies above 85°C ambient or with poor PCB thermal coupling; full 300mA capability is maintained across the –40°C to +85°C industrial temperature range when the exposed pad is properly soldered to a thermal plane.
How does the LTC3547BEDDB-1#TRMPBF achieve low dropout operation?
The LTC3547BEDDB-1#TRMPBF achieves low dropout via 100% duty-cycle operation: when VIN approaches VOUT, the internal P-channel MOSFET remains continuously on, passing current with only RDS(ON)-based drop. At 300mA and 2.7V input, dropout voltage is ~270mV - extending usable battery life in Li-ion systems down to 2.5V cutoff.
Can the LTC3547BEDDB-1#TRMPBF be used with all-ceramic capacitor designs?
Yes - the LTC3547BEDDB-1#TRMPBF is specifically designed for all-ceramic capacitor operation. Its current-mode control and internal compensation ensure stability with low-ESR ceramic output capacitors (≥4.7μF, X5R/X7R), eliminating the need for tantalum or aluminum polymer caps and reducing solution size, cost, and failure risk in portable applications.
LTC3547BEDDB-1#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:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.2V, 1.8V
- Voltage - Output (Max):
- -
- 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-1#TRMPBF FAQ
1.How can I place an order for LTC3547BEDDB-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3547BEDDB-1#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 LTC3547BEDDB-1#TRMPBF reliable?
The price and inventory of LTC3547BEDDB-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3547BEDDB-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3547BEDDB-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3547BEDDB-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3547BEDDB-1#TRMPBF?
LTC3547BEDDB-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3547BEDDB-1#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 LTC3547BEDDB-1#TRMPBF?
For technical support, including LTC3547BEDDB-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3547BEDDB-1#TRMPBF requirements.
6.How does Aetrix verify that LTC3547BEDDB-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3547BEDDB-1#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 LTC3547BEDDB-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3547BEDDB-1#TRMPBF?
All LTC3547BEDDB-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3547BEDDB-1#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 LTC3547BEDDB-1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3547BEDDB-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3547BEDDB-1#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…
