My Inquiry
My Account
Analog Devices Inc. LTC3547BEDDB-1#TRPBF
- Part No.:
- LTC3547BEDDB-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3547BEDDB-1#TRPBF.pdf
- Description:
- IC REG BUCK 1.2/1.8V 300MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,055
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3547BEDDB-1#TRPBF 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#TRPBF datasheet, LTC3547BEDDB-1#TRPBF pinout, LTC3547BEDDB-1#TRPBF application, or LTC3547BEDDB-1#TRPBF 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 space-constrained 0.75mm-profile layouts.
Technical Context
The LTC3547BEDDB-1#TRPBF 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 control, short-circuit protection via extended bottom-switch conduction, and pulse-skipping mode at light loads. The device is internally compensated and requires no external loop components when using ceramic output capacitors.
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 | 1.8V (Ch1) / 1.2V (Ch2) - factory-fixed via internal resistor dividers; eliminates external feedback resistors and layout sensitivity. |
| Max Output Current | 300mA per channel - sufficient for powering core logic, memory I/O, and low-power DSPs in handheld devices. |
| Switching Frequency | 2.25MHz (typ) - enables use of sub-5mm surface-mount inductors (e.g., 4.7μH) and low-ESR ceramic capacitors for minimal footprint. |
| Efficiency | Up to 96% - achieved at mid-load (e.g., 100mA) with VIN = 3.6V, VOUT = 1.8V; reduces thermal load in sealed enclosures. |
| Shutdown Current | <1μA - preserves battery life during system sleep modes in always-on sensor or communication subsystems. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9), 0.75mm profile, RoHS-compliant, lead-free finish. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Regulator 1 feedback input | Internally connected to 1.8V divider; must be tied directly to VOUT1 for regulation - no external resistors required. |
| RUN1 (Pin 2) | Regulator 1 enable | Logic-high (>0.4V) enables Channel 1; logic-low (<0.1V) forces shutdown with <1μA quiescent draw. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 4.7μF ceramic decoupling to GND (Pin 5) with minimal trace inductance. |
| 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 low-impedance copper pour under DFN body. |
| SW2 (Pin 6) | Channel 2 switch node | Connects to inductor L2; electrically identical to SW1 but isolated for independent layout routing. |
| RUN2 (Pin 7) | Regulator 2 enable | Independent control of Channel 2; allows staggered power-up or dynamic rail sequencing in multi-voltage systems. |
| VFB2 (Pin 8) | Regulator 2 feedback input | Internally connected to 1.2V divider; direct connection to VOUT2 required - no external components. |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-output configuration | Eliminates external feedback resistors and layout-dependent voltage drift - ensures ±1.2% output accuracy over temperature and line. |
| 100% duty-cycle operation | Enables dropout down to VOUT + ILOAD×RDS(ON), extending usable battery range in deep-discharge states (e.g., 2.7V input → 1.8V output). |
| Internal soft-start (650μs) | Prevents inrush into large output capacitors during power-up; avoids input voltage sag and false brownout detection in host systems. |
| Ceramic-capacitor compatibility | No ESR dependency for stability - allows use of low-profile, high-RMS-current X5R/X7R ceramics (e.g., 10μF/6.3V) without phase-margin risk. |
| Short-circuit foldback | Reduces switching frequency and limits peak inductor current during output shorts - prevents thermal runaway without external current-sense circuitry. |
Applications
| Mobile Baseband Power | Digital Camera Core Supply |
|---|---|
Use Scenario: Powering ARM-based application processors and LPDDR memory I/O in smartphones. IC Role / Device Role / Timing Role: Dual-rail point-of-load regulator delivering 1.8V for memory interface and 1.2V for CPU core, synchronized to minimize beat-frequency noise. Use Value: 2.25MHz switching avoids AM radio band interference; fixed outputs eliminate calibration overhead in high-volume manufacturing. |
Use Scenario: Supplying image sensor analog front-end and ISP digital core in compact digital still cameras. IC Role / Device Role / Timing Role: Independent dual-channel buck converter enabling simultaneous 1.8V sensor bias and 1.2V digital logic rail with fast transient response. Use Value: Pulse-skipping mode maintains >85% efficiency at standby currents <1mA, extending battery life during viewfinder operation. |
| Wireless Modem RF SoC | Portable Media Player Audio Codec |
Use Scenario: Providing clean, low-noise power to LTE/Wi-Fi RF transceivers and baseband ICs in USB-powered modems. IC Role / Device Role / Timing Role: Dual-output regulator with independent RUN controls enabling RF section power gating while keeping baseband active. Use Value: 96% peak efficiency minimizes self-heating near sensitive RF sections; 0.75mm DFN fits within tight board area constraints. |
Use Scenario: Powering stereo audio DAC/ADC and headphone amplifier in flash-based media players. IC Role / Device Role / Timing Role: Low-noise dual buck supplying 1.8V for digital audio processing and 1.2V for analog bias, with soft-start preventing pop/click on playback start. Use Value: Internal compensation eliminates need for external compensation networks - reduces BOM count and layout sensitivity to EMI. |
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 |
|---|---|---|---|
| TPS62260DRVR | Single-channel, adjustable 0.6–5.5V output; 3MHz switching; 300mA rating; requires external feedback resistors. | Lacks dual fixed outputs - needs two separate ICs or additional sequencing logic for 1.8V/1.2V rails. | Select when design requires programmable outputs or higher frequency than 2.25MHz. |
| RT8059GJ6 | Dual-channel, adjustable outputs; 2.5MHz; 600mA per channel; external compensation required for ceramic caps. | Higher current capability but larger 2mm × 2mm QFN-12 package; no factory-fixed voltage option. | Select when higher output current or flexible voltage assignment outweighs board area and BOM simplicity. |
Compared with TPS62260DRVR and RT8059GJ6, the LTC3547BEDDB-1#TRPBF provides guaranteed dual fixed outputs in the smallest footprint (3mm × 2mm), eliminates external feedback components, and offers superior light-load efficiency via integrated pulse-skipping - making it optimal for cost-sensitive, space-constrained dual-rail portable designs.
Availability
LTC3547BEDDB-1#TRPBF is available at Aetrix Electronics and suitable for mobile baseband power, digital camera core supply, wireless modem RF SoC, and portable media player audio codec applications requiring stable component supply across production lifecycles.
Supply support for LTC3547BEDDB-1#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LTC3547B family was designed specifically for ultra-compact, high-efficiency dual-rail power conversion in battery-powered portable electronics - emphasizing low quiescent current, fixed-output simplicity, and robust thermal performance in miniature DFN packages.
FAQ
What are the fixed output voltages of the LTC3547BEDDB-1#TRPBF?
The LTC3547BEDDB-1#TRPBF 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 for regulation.
Does the LTC3547BEDDB-1#TRPBF require external compensation components?
No. The LTC3547BEDDB-1#TRPBF is internally compensated and fully stable with ceramic output capacitors. This eliminates external compensation networks, reduces BOM count, and removes layout sensitivity to ESR-related phase margin issues - a key advantage over many adjustable dual-buck controllers.
What is the maximum junction temperature and thermal resistance of the LTC3547BEDDB-1#TRPBF?
The LTC3547BEDDB-1#TRPBF has a maximum junction temperature of 125°C and a typical θJA of 76°C/W when properly soldered to a 4-layer PCB with the exposed pad connected to a solid ground plane. At 300mA per channel in dropout (VIN = 2.7V), calculated junction temperature remains ~82°C at 70°C ambient - well within safe operating limits.
Can the LTC3547BEDDB-1#TRPBF operate with only one channel enabled?
Yes. The LTC3547BEDDB-1#TRPBF supports independent channel control via RUN1 and RUN2 pins. Either channel can be disabled (drawing <1μA) while the other remains active - enabling dynamic power rail management, such as powering memory while shutting down the processor core in low-power states.
What type of inductors are recommended for use with the LTC3547BEDDB-1#TRPBF?
Shielded surface-mount inductors with 4.7μH nominal value, ≥700mA saturation current, and low DCR (e.g., Panasonic ELT5KT4R7M or Sumida CDRH2D18/LD) are recommended. These provide optimal ripple current (~120mA at 300mA load), minimal EMI radiation, and reliable operation at 2.25MHz without core saturation.
LTC3547BEDDB-1#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3547BEDDB-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3547BEDDB-1#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-1#TRPBF reliable?
The price and inventory of LTC3547BEDDB-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3547BEDDB-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3547BEDDB-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3547BEDDB-1#TRPBF?
LTC3547BEDDB-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3547BEDDB-1#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-1#TRPBF?
For technical support, including LTC3547BEDDB-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3547BEDDB-1#TRPBF requirements.
6.How does Aetrix verify that LTC3547BEDDB-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3547BEDDB-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3547BEDDB-1#TRPBF?
All LTC3547BEDDB-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3547BEDDB-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3547BEDDB-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3547BEDDB-1#TRPBF 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…
