My Inquiry
My Account
Analog Devices Inc. LTC3547BEDDB#TRMPBF
- Part No.:
- LTC3547BEDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3547BEDDB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA DL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:215
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3547BEDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a dual-channel, monolithic, synchronous step-down DC/DC converter optimized for portable Li-ion and USB-powered systems. It delivers up to 300mA per channel across an input range of 2.5V–5.5V, features 2.25MHz fixed-frequency operation, 0.6V feedback reference, and 100% duty cycle low-dropout capability - enabling extended battery runtime in space-constrained applications like digital cameras and media players.
For engineers reviewing the LTC3547BEDDB#TRMPBF datasheet, LTC3547BEDDB#TRMPBF pinout, LTC3547BEDDB#TRMPBF application, or LTC3547BEDDB#TRMPBF equivalent, key selection criteria include dual independent enable control (RUN1/RUN2), internal compensation for ceramic output capacitors, ±1% output voltage accuracy over temperature, thermal shutdown protection, and compatibility with compact 3mm × 2mm DFN-8 packaging.
Technical Context
The LTC3547BEDDB#TRMPBF employs a constant-frequency current-mode control architecture with synchronized in-phase switching across both channels. Each regulator integrates matched P-channel high-side and N-channel low-side MOSFETs with typical RDS(ON) of 0.8Ω (top) and 0.75Ω (bottom) at VIN = 3.6V, supporting peak switch currents up to 550mA per channel.
It operates with independent soft-start (≈650μs ramp time), pulse-skip mode at light loads, and short-circuit protection via extended bottom-switch conduction. The 0.6V reference enables precise output setting down to 1.2V (e.g., VOUT2 = 1.2V in LTC3547B-1 variant), while internal compensation eliminates external loop components when using ceramic COUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion polymer (2.7–4.2V) and USB 5V bus without external LDO pre-regulation. |
| Output Current per Channel | 300mA continuous - sufficient for powering core logic, memory, and I/O rails 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. |
| Feedback Reference Voltage | 0.6V ±1% - allows accurate low-voltage outputs (e.g., 1.2V, 1.8V, 2.5V) with standard resistor dividers. |
| Shutdown Quiescent Current | <1μA - minimizes battery drain during system sleep modes in always-on portable electronics. |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
| Efficiency (Typ.) | 96% at VIN = 3.6V, VOUT = 1.8V, IOUT = 100mA - reduces thermal load and extends runtime in thermally constrained enclosures. |
Pinout & Package
Package: 8-lead, 3mm × 2mm, 0.75mm profile plastic DFN (DDB) with 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 | Monitors output voltage via external resistor divider; regulated to 0.6V for precision output setting. |
| RUN1 (Pin 2) | Regulator 1 enable control | Logic-high (>0.4V) enables Channel 1; logic-low disables with <1μA leakage - supports independent power sequencing. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 4.7μF ceramic decoupling to GND (Pin 5) to suppress high-frequency switching noise. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; must be routed with minimal loop area to reduce EMI. |
| GND (Pin 5) | Power and signal ground | Common return for CIN, COUT, and exposed pad; critical for stability and thermal dissipation. |
| SW2 (Pin 6) | Channel 2 switch node | Independent switch node for second buck stage; requires separate inductor and output capacitor. |
| RUN2 (Pin 7) | Regulator 2 enable control | Functionally identical to RUN1 - enables independent control of Channel 2 for flexible power management. |
| VFB2 (Pin 8) | Regulator 2 feedback input | Identical function to VFB1; allows independent output voltage programming for dual-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables dropout mode when VIN ≈ VOUT, preserving regulation down to ~2.7V input for 2.5V output - critical for battery end-of-life operation. |
| Internal compensation | Eliminates need for external compensation network when using ceramic output capacitors - simplifies layout and reduces BOM count. |
| Independent soft-start | Each channel ramps output over ~650μs to limit inrush current into large output capacitance - prevents input rail collapse during power-up. |
| Short-circuit protection | Forces extended bottom-FET conduction during overload to safely discharge inductor energy - avoids thermal runaway without external circuitry. |
| No external Schottky diodes | Synchronous rectification with integrated N-channel MOSFET replaces lossy diodes - improves efficiency by 5–10% vs. asynchronous designs. |
Applications
| Digital Still Camera Power Management | Wireless Modem Baseband Supply |
|---|---|
Use Scenario: Dual-rail power for image sensor (1.8V) and processor core (2.5V) in compact camera modules. IC Role / Device Role / Timing Role: Primary dual-output DC/DC regulator delivering tightly regulated, low-noise supplies with independent enable control. Use Value: 2.25MHz switching enables ultra-small magnetics; 96% efficiency at 100mA reduces heat in sealed optical housings. |
Use Scenario: Powering baseband IC and RF transceiver in DSL/wireless modems with USB or Li-ion input. IC Role / Device Role / Timing Role: Dual synchronous buck converter supplying 1.2V (core) and 1.8V (I/O) rails from shared 3.3–5V source. Use Value: Independent RUN pins allow staggered startup to meet inrush limits; 1μA shutdown current preserves standby battery life. |
| Portable Media Player SoC Core | PDA/Palmtop System-on-Chip |
Use Scenario: Regulating CPU core (1.2V) and memory interface (1.8V) in battery-powered audio/video players. IC Role / Device Role / Timing Role: High-efficiency dual buck regulator with ceramic-capacitor compatibility for low-profile PCBs. Use Value: 0.6V reference and internal compensation support stable 1.2V output with <±1% accuracy over –40°C to 85°C. |
Use Scenario: Generating multiple low-voltage rails (e.g., 2.5V logic, 1.8V I/O) from single Li-ion cell in legacy PDA platforms. IC Role / Device Role / Timing Role: Compact dual-step-down regulator replacing discrete solutions to save board area and cost. Use Value: 3mm × 2mm DFN package fits tight spacing constraints; 100% duty cycle maintains regulation as battery discharges to 2.7V. |
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-channel 300mA buck; 3.6MHz switching; 0.6V ref; same 2mm × 2mm DFN-8 package but no dual output. | Requires two units for dual-rail design - increases layout area and component count. | Select only if independent optimization of each rail's frequency or feedback network is required. |
| RT8059GJ6 | Dual 600mA buck; 1.5MHz; 0.6V ref; 2mm × 2mm DFN-6 package; no RUN pins; lower quiescent current (0.5μA). | Lacks independent enable control and has reduced thermal margin due to smaller package and higher current density. | Preferable for higher-current, space-constrained apps where sequencing is handled externally. |
Compared with TPS62231DRYT and RT8059GJ6, the LTC3547BEDDB#TRMPBF uniquely provides true dual-channel integration with independent RUN control, 2.25MHz operation for smallest passive size, and guaranteed 300mA per channel in a thermally robust 3mm × 2mm DFN - making it optimal for compact, battery-sensitive dual-rail systems.
Availability
LTC3547BEDDB#TRMPBF is available at Aetrix Electronics and suitable for digital still cameras, wireless modems, and portable media players requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3547BEDDB#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LTC3547B series was designed specifically for space- and efficiency-critical portable electronics, delivering dual synchronous buck conversion with minimal external components and industry-leading light-load efficiency in ultra-compact packages.
FAQ
What is the maximum continuous output current per channel for the LTC3547BEDDB#TRMPBF?
The LTC3547BEDDB#TRMPBF delivers up to 300mA continuous output current per channel under typical conditions (VIN = 3V, TA = 25°C). This rating is maintained across the full operating temperature range (–40°C to +85°C) with proper PCB thermal design, including soldering the exposed pad to a thermal plane.
Does the LTC3547BEDDB#TRMPBF require external compensation components?
No - the LTC3547BEDDB#TRMPBF is internally compensated and fully stable with ceramic output capacitors. External compensation is unnecessary unless custom transient response tuning is required; the device is optimized for 4.7μF–10μF X5R/X7R ceramics on each output.
Can the LTC3547BEDDB#TRMPBF operate with a 2.5V input supply?
Yes - the LTC3547BEDDB#TRMPBF supports input voltages from 2.5V to 5.5V. At 2.5V input, it maintains regulation down to ~1.2V output via 100% duty cycle operation, though efficiency decreases due to higher RDS(ON) of the P-channel switch at low VIN.
What is the purpose of the RUN1 and RUN2 pins on the LTC3547BEDDB#TRMPBF?
RUN1 and RUN2 provide independent enable/disable control for each buck channel. Driving either pin high (≥0.4V) activates its respective regulator; pulling it low disables that channel with <1μA shutdown current - enabling flexible power sequencing and dynamic rail management in multi-voltage systems.
Is the LTC3547BEDDB#TRMPBF pin-compatible with other variants like LTC3547B-1?
Yes - all LTC3547B variants (including LTC3547BEDDB#TRMPBF and LTC3547BEDDB-1#TRMPBF) share identical pinout, package, and electrical interface. The -1 suffix denotes factory-trimmed fixed outputs (1.8V/1.2V), while the base part is adjustable via external resistors on VFB1/VFB2.
LTC3547BEDDB#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):
- 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#TRMPBF FAQ
1.How can I place an order for LTC3547BEDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3547BEDDB#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#TRMPBF reliable?
The price and inventory of LTC3547BEDDB#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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3547BEDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3547BEDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3547BEDDB#TRMPBF?
LTC3547BEDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3547BEDDB#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#TRMPBF?
For technical support, including LTC3547BEDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3547BEDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC3547BEDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3547BEDDB#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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3547BEDDB#TRMPBF?
All LTC3547BEDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3547BEDDB#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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3547BEDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3547BEDDB#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…
