My Inquiry
My Account
Analog Devices Inc. LTC3547EDDB-1#TRPBF
- Part No.:
- LTC3547EDDB-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3547EDDB-1#TRPBF.pdf
- Description:
- IC REG BUCK 1.2/1.8V 300MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,085
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3547EDDB-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 supports 100% duty cycle for low-dropout operation in Li-ion–powered portable electronics.
For engineers reviewing the LTC3547EDDB-1#TRPBF datasheet, LTC3547EDDB-1#TRPBF pinout, LTC3547EDDB-1#TRPBF application, or LTC3547EDDB-1#TRPBF equivalent, key selection criteria include fixed dual-output voltage configuration, 2.25MHz constant-frequency operation, <1µA shutdown current, internal compensation for ceramic capacitors, and independent soft-start per channel.
Technical Context
The LTC3547EDDB-1#TRPBF implements a current-mode control architecture with synchronized 2.25MHz switching across both channels. Each regulator uses an internal 0.6V reference and fixed resistor divider to set its output - 1.8V on Channel 1 (VFB1), 1.2V on Channel 2 (VFB2) - eliminating external feedback components. The device integrates P-channel and N-channel MOSFETs with typical RDS(ON) of 0.8Ω (top) and 0.75Ω (bottom) at 3.6V.
Burst Mode® operation engages automatically below ~60mA load per channel, reducing quiescent current to 40µA (both channels active) and maintaining low ripple (20mVP-P). Short-circuit protection forces extended bottom-switch conduction to limit peak inductor current, while thermal shutdown activates above ~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 (2.7–4.2V) and USB 5V rails without external regulation. |
| Output Voltages | Fixed 1.8V (CH1) and 1.2V (CH2) - eliminates external feedback resistors and simplifies layout for dual-core processors or memory I/O. |
| Max Output Current | 300mA per channel - sufficient for powering DSP cores, RF transceivers, or FPGA I/O banks in compact portable systems. |
| Switching Frequency | 2.25MHz (±25%) - enables use of sub-5mm surface-mount inductors (e.g., 4.7µH) and small ceramic capacitors (e.g., 4.7µF). |
| Quiescent Current | 40µA (both channels active) - extends battery runtime in always-on subsystems such as real-time clocks or sensor interfaces. |
| Shutdown Current | <1µA - ensures negligible drain during deep sleep modes in handheld devices. |
| Efficiency Peak | 96% at 300mA, VIN = 3.6V, VOUT = 1.8V - minimizes thermal load and maximizes energy utilization in thermally constrained enclosures. |
| 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
8-lead plastic DFN (3mm × 2mm, 0.75mm height) with exposed GND pad (Pin 9). Requires soldering of exposed pad to PCB thermal plane for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Internally connected to fixed 1.8V divider; must be tied directly to VOUT1 - no external resistors required. |
| RUN1 (Pin 2) | Channel 1 enable control | Logic-high (>0.4V) enables CH1; logic-low (<0.4V) places CH1 in shutdown with <1µA current draw. |
| VIN (Pin 3) | Main power input | Supplies both regulators; requires local 4.7µF ceramic decoupling capacitor placed within 2mm of Pin 3 and GND. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor L1; swings between VIN and GND; high di/dt node requiring short, wide trace routing. |
| GND (Pin 5) | Power and signal ground | Common return for CIN, COUT, and exposed pad; must be solid copper pour with multiple vias to inner ground plane. |
| SW2 (Pin 6) | Channel 2 switch node | Connects to inductor L2; electrically isolated from SW1 but shares same VIN and GND references. |
| RUN2 (Pin 7) | Channel 2 enable control | Independent enable for CH2; allows staggered startup or selective power gating of subsystems. |
| VFB2 (Pin 8) | Channel 2 feedback input | Internally connected to fixed 1.2V divider; must be tied directly to VOUT2 - no external components needed. |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-output configuration | Eliminates four external feedback resistors and two compensation capacitors - reduces BOM count and board area by >15% vs adjustable version. |
| Internal compensation | Stable with all-ceramic output capacitors (≥4.7µF, X5R/X7R); removes need for ESR-based loop stabilization and avoids tantalum reliability concerns. |
| Independent soft-start | 650µs ramp time per channel - prevents inrush current into large output capacitance and avoids input rail collapse during simultaneous startup. |
| 100% duty-cycle operation | Maintains regulation down to VIN – VOUT ≈ 150mV at 300mA (based on RDS(ON) = 0.9Ω @ 2.7V) - extends usable battery life in deep discharge conditions. |
| Burst Mode® with low ripple | 20mVP-P output ripple at light loads - meets noise-sensitive analog supply requirements (e.g., ADC reference, PLL VCO) without adding post-regulation LDOs. |
| Short-circuit foldback | Reduces switching frequency under overload - limits average power dissipation and prevents thermal runaway during sustained fault conditions. |
Applications
| Mobile Baseband Processor Power | Digital Camera Sensor Core Supply |
|---|---|
Use Scenario: Powers ARM Cortex-A series application processor cores and DDR I/O in smartphones and tablets. IC Role / Device Role / Timing Role: Dual-output buck regulator delivering 1.8V (core logic) and 1.2V (memory interface) with independent enable control for dynamic voltage scaling. Use Value: Enables fast, low-noise power sequencing and eliminates need for discrete LDOs - reduces total solution size by 30% and improves system-level efficiency by 8% over LDO-based designs. | Use Scenario: Supplies image sensor digital core and analog front-end in compact digital still cameras and action cams. IC Role / Device Role / Timing Role: Provides tightly regulated, low-ripple 1.8V and 1.2V rails synchronized to sensor frame timing to minimize clock-induced noise coupling. Use Value: Burst Mode® operation maintains <20mVP-P ripple during standby while drawing only 40µA - extends battery life by >4 hours per charge in intermittent capture mode. |
| Wireless Modem RF Front-End Bias | Portable Media Player Audio Codec Supply |
Use Scenario: Powers LTE/Wi-Fi transceiver ICs including PA drivers, LNA, and synthesizer blocks in USB-powered modems. IC Role / Device Role / Timing Role: Delivers clean, low-noise 1.8V (digital control) and 1.2V (RF bias) with independent RUN pins for rapid RF section power cycling. Use Value: 2.25MHz switching moves noise spectrum above sensitive IF bands; internal compensation ensures stability with small 4.7µF ceramic caps - eliminates EMI filtering components. | Use Scenario: Supplies stereo audio codec and headphone amplifier in flash-based MP3 players and Bluetooth earbuds. IC Role / Device Role / Timing Role: Generates ultra-low-noise 1.8V (digital logic) and 1.2V (analog bias) with <1µA shutdown current to preserve battery during playback pauses. Use Value: 96% peak efficiency at 300mA reduces thermal load in sealed plastic enclosures; 100% duty cycle sustains operation until battery drops to 2.6V - adds ~12 minutes of playback time. |
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-channel, 300mA, 1.8V fixed output; no second output; 3MHz switching; 2.05V–6.5V input range. | Requires separate regulator for 1.2V rail; higher input voltage ceiling suits wider-input industrial systems. | Select when only one regulated rail is needed and higher input voltage tolerance is critical. |
| RT8059NGQW | Dual-channel, 600mA per channel, adjustable outputs; 2.5V–5.5V input; 2.4MHz switching; requires external feedback resistors. | Supports custom voltage combinations (e.g., 1.5V/1.0V) but increases component count and layout complexity. | Select when flexible output voltage pairing is required and board space permits additional resistors/caps. |
Compared with TPS62231DRYT and RT8059NGQW, the LTC3547EDDB-1#TRPBF uniquely combines fixed dual outputs (1.8V/1.2V), zero-external-feedback design, and Burst Mode® ripple performance - making it optimal for space-constrained, battery-operated consumer devices where BOM simplicity and light-load efficiency are prioritized.
Availability
LTC3547EDDB-1#TRPBF is available at Aetrix Electronics and suitable for mobile baseband power, digital camera sensor supplies, wireless modem RF biasing, portable media player audio codecs, and handheld medical diagnostics requiring stable component supply and long-term production continuity.
Supply support for LTC3547EDDB-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3547EDDB-1#TRPBF belongs to Linear's µPower synchronous buck regulator family, engineered specifically for ultra-low-power, space-constrained portable electronics requiring dual independent regulated rails with minimal external components.
FAQ
What are the fixed output voltages of the LTC3547EDDB-1#TRPBF?
The LTC3547EDDB-1#TRPBF provides fixed output voltages of 1.8V on Channel 1 (VFB1) and 1.2V on Channel 2 (VFB2). These values are set by internal resistor dividers, so no external feedback components are required - VFB1 and VFB2 must be connected directly to their respective output nodes. This configuration is explicitly defined in Table 2 of the LTC3547 datasheet and distinguishes the -1 variant from the adjustable LTC3547EDDB.
Does the LTC3547EDDB-1#TRPBF require external compensation components?
No, the LTC3547EDDB-1#TRPBF is internally compensated and designed to operate stably with ceramic output capacitors ≥4.7µF (X5R or X7R dielectric). Unlike adjustable regulators that rely on output capacitor ESR for loop stability, this device uses a fully integrated compensation network - eliminating the need for external RC networks, feedforward capacitors, or ESR-tuned tantalums. This is confirmed in the Features section and Applications Information of the official datasheet.
What is the maximum continuous output current per channel for the LTC3547EDDB-1#TRPBF?
The LTC3547EDDB-1#TRPBF delivers up to 300mA continuous output current per channel across the full input voltage range (2.5V to 5.5V) and operating temperature range (–40°C to 85°C). This rating is validated under thermal conditions with proper PCB layout - including soldering the exposed pad to a thermal plane - and is specified in the Absolute Maximum Ratings and Electrical Characteristics tables of the datasheet.
How does Burst Mode® operation affect output ripple on the LTC3547EDDB-1#TRPBF?
In Burst Mode®, the LTC3547EDDB-1#TRPBF maintains output ripple at ≤20mVP-P (measured at VOUT = 1.5V with 4.7µF output capacitor), significantly lower than typical burst-mode regulators. This low ripple is achieved through controlled burst timing and precise sleep-threshold regulation, enabling direct use in noise-sensitive analog circuits like ADC references or PLL VCO supplies without post-filtering. The value is specified in the Electrical Characteristics table under VBURST.
Can the LTC3547EDDB-1#TRPBF operate in 100% duty cycle mode, and what is its dropout behavior?
Yes, the LTC3547EDDB-1#TRPBF supports 100% duty cycle operation, allowing regulation down to VIN – VOUT ≈ 150mV at 300mA (based on RDS(ON) ≈ 0.9Ω at 2.7V). In dropout, the P-channel top switch remains continuously on, and output voltage equals VIN minus conduction losses across the internal MOSFET and inductor DCR. This behavior extends usable battery life in deep-discharge states and is documented in the Dropout Operation section of the datasheet.
LTC3547EDDB-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)
LTC3547EDDB-1#TRPBF FAQ
1.How can I place an order for LTC3547EDDB-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3547EDDB-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 LTC3547EDDB-1#TRPBF reliable?
The price and inventory of LTC3547EDDB-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 LTC3547EDDB-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3547EDDB-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3547EDDB-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3547EDDB-1#TRPBF?
LTC3547EDDB-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3547EDDB-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 LTC3547EDDB-1#TRPBF?
For technical support, including LTC3547EDDB-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3547EDDB-1#TRPBF requirements.
6.How does Aetrix verify that LTC3547EDDB-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3547EDDB-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 LTC3547EDDB-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3547EDDB-1#TRPBF?
All LTC3547EDDB-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3547EDDB-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 LTC3547EDDB-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3547EDDB-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3547EDDB-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…
