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Analog Devices Inc. LTC3547EDDB#TRMPBF
- Part No.:
- LTC3547EDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3547EDDB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA DL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,297
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Product details
Overview
LTC3547EDDB#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 2.5V–5.5V input, features 2.25MHz fixed-frequency operation, 0.6V feedback reference, and 100% duty-cycle low-dropout mode - enabling extended battery life in space-constrained applications such as digital still cameras and wireless modems.
For engineers reviewing the LTC3547EDDB#TRMPBF datasheet, LTC3547EDDB#TRMPBF pinout, LTC3547EDDB#TRMPBF application, or LTC3547EDDB#TRMPBF equivalent, key selection criteria include dual independent enable control (RUN1/RUN2), internal compensation for ceramic output capacitors, Burst Mode® operation with ≤20mVP-P ripple, <1µA shutdown current, and thermal performance in the 3mm × 2mm DFN-8 package with exposed pad.
Technical Context
The LTC3547EDDB#TRMPBF employs a constant-frequency current-mode architecture with synchronized in-phase switching across both channels at 2.25MHz. Each regulator uses an internal 0.6V reference and error amplifier to regulate output voltage via external resistor dividers on VFB1/VFB2, supporting adjustable outputs down to 0.6V.
It integrates 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, enables 100% duty-cycle dropout operation, and incorporates independent soft-start (650µs), short-circuit protection, and automatic Burst Mode® for light-load efficiency optimization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion (2.7–4.2V) and USB 5V rails without external regulation. |
| Output Current per Channel | 300mA continuous - sufficient for core logic, I/O, and RF subsystems in portable devices. |
| Switching Frequency | 2.25MHz (typ) - enables use of compact 2.2–4.7µH inductors and 4.7µF ceramic capacitors. |
| Feedback Reference Voltage | 0.6V ±1% - allows precise low-voltage outputs (e.g., 1.2V, 1.8V, 2.5V) with standard resistor ratios. |
| Quiescent Current | 40µA (both channels active) - minimizes standby power loss in always-on subsystems. |
| Shutdown Current | <1µA - critical for long-term battery retention in sleep-mode applications. |
| Burst Mode Ripple | 20mVP-P - maintains signal integrity for noise-sensitive analog or RF circuitry. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
Package: 8-lead 3mm × 2mm DFN (0.75mm height) with exposed GND pad (Pin 9), requiring PCB soldering for thermal and electrical integrity. θJA = 76°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Regulator 1 feedback input | Connects to resistor divider from VOUT1; regulates output by holding at 0.6V reference. |
| RUN1 (Pin 2) | Regulator 1 enable control | High = active; low = shutdown; supports independent sequencing of dual outputs. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 4.7µF ceramic decoupling to GND (Pin 5). |
| SW1 (Pin 4) | Regulator 1 switch node | Connects to inductor L1; swings between VIN and GND; high di/dt node requiring tight layout. |
| GND (Pin 5) | Power and signal ground | Common return for CIN, COUT, and exposed pad; must be low-impedance plane. |
| SW2 (Pin 6) | Regulator 2 switch node | Connects to inductor L2; electrically identical to SW1 but independent channel. |
| RUN2 (Pin 7) | Regulator 2 enable control | Independent enable/disable control for second output; supports staggered startup. |
| VFB2 (Pin 8) | Regulator 2 feedback input | Same function as VFB1; enables independent output voltage setting for VOUT2. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent soft-start | 650µs ramp per channel - prevents inrush current into output capacitors during power-up. |
| Internal compensation | Stable with all-ceramic COUT - eliminates need for ESR-based compensation networks. |
| Current-mode control | Fast line/load transient response - reduces output deviation during CPU or RF burst loads. |
| 100% duty-cycle operation | Supports dropout down to VOUT + RDS(ON)·IOUT - extends usable battery range near end-of-discharge. |
| Short-circuit protection | Automatic frequency reduction during fault - limits power dissipation without latch-off. |
| Low-noise Burst Mode® | 20mVP-P ripple at light load - avoids audible noise and interference with sensitive analog circuits. |
Applications
| Digital Still Camera Power Management | Wireless Modem Core Supply |
|---|---|
Use Scenario: Dual-rail power for image sensor (1.8V) and baseband processor (2.5V) in compact camera modules. IC Role / Device Role / Timing Role: Primary dual-output buck regulator providing independently enabled, low-noise, high-efficiency DC/DC conversion. Use Value: Enables simultaneous operation of mixed-voltage subsystems within 6mm² board area while maintaining >90% efficiency at 10–100mA loads. |
Use Scenario: Powering LTE/5G modem SoC cores and RF front-end ICs from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-channel step-down regulator delivering stable 1.2V and 1.8V rails with fast transient response to burst data traffic. Use Value: Supports dynamic voltage scaling and deep-sleep modes with <1µA shutdown current, extending talk time by >15% vs. discrete solutions. |
| Portable Media Player Audio Subsystem | PDA/Palmtop System-on-Module |
Use Scenario: Clean, low-ripple power for DAC, headphone amp, and audio codec in battery-powered players. IC Role / Device Role / Timing Role: Low-noise dual buck supplying 1.2V digital core and 1.8V analog/IO rails with Burst Mode® active below 20mA. Use Value: Achieves ≤20mVP-P output ripple in Burst Mode®, eliminating audible switching noise in audio playback path. |
Use Scenario: Compact power solution for legacy PDA mainboard integrating ARM CPU, LCD controller, and USB PHY. IC Role / Device Role / Timing Role: Dual adjustable buck replacing multiple discrete regulators to reduce BOM count and PCB area. Use Value: Reduces total power solution footprint by 40% vs. dual-SOIC buck converters while maintaining full thermal derating at 85°C ambient. |
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; 3MHz switching; 0.6V ref; no dual output or independent RUN pins. | Requires two devices for dual-rail designs; lacks independent enable/soft-start per channel. | Choose when only one regulated rail is needed and board space permits dual ICs. |
| RT8059NGQW | Dual 600mA buck; 1.5MHz; 0.6V ref; integrated compensation; but no Burst Mode® or 100% duty cycle. | Higher current per channel but larger 3mm × 3mm QFN; less efficient below 5mA due to fixed-frequency operation. | Prefer when higher output current or lower cost is prioritized over ultra-low IQ and light-load efficiency. |
Compared with TPS62231DRYT and RT8059NGQW, the LTC3547EDDB#TRMPBF uniquely combines dual independent regulation, sub-1µA shutdown, Burst Mode® with low ripple, and 100% duty-cycle operation in a 3mm × 2mm footprint - making it optimal for battery-constrained dual-rail portable systems where size, efficiency, and noise performance are co-prioritized.
Availability
LTC3547EDDB#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 RoHS-compliant packaging.
Supply support for LTC3547EDDB#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 precision power management portfolio, known for high-efficiency, low-noise, and thermally robust DC/DC solutions targeting portable and industrial applications.
The LTC3547EDDB#TRMPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for space- and battery-life-constrained portable electronics requiring dual independent, low-quiescent-current power rails.
FAQ
What is the maximum continuous output current per channel for the LTC3547EDDB#TRMPBF?
The LTC3547EDDB#TRMPBF delivers up to 300mA continuous output current per channel under typical conditions (VIN = 3V, TA = 25°C). This rating holds across the full operating temperature range (–40°C to +85°C) and input voltage range (2.5V to 5.5V), provided thermal design meets θJA ≤ 76°C/W with proper PCB copper and exposed pad soldering. Derating applies above 85°C ambient.
Does the LTC3547EDDB#TRMPBF support independent enable control for each output?
Yes, the LTC3547EDDB#TRMPBF provides fully independent enable control via RUN1 (Pin 2) and RUN2 (Pin 7). Driving either pin high enables its respective regulator; pulling it low places that channel in shutdown with <1µA quiescent current. This allows flexible power sequencing, dynamic rail disabling, and system-level power gating without affecting the other channel.
Can the LTC3547EDDB#TRMPBF operate with ceramic output capacitors only?
Yes, the LTC3547EDDB#TRMPBF is internally compensated and explicitly designed to be stable with all-ceramic output capacitor networks. Its current-mode control architecture does not rely on capacitor ESR for loop stability, enabling use of low-ESR, high-capacitance X5R/X7R ceramics (e.g., 4.7µF) to minimize output ripple and board area - unlike older voltage-mode buck regulators.
What is the purpose of the exposed pad (Pin 9) on the LTC3547EDDB#TRMPBF DFN package?
The exposed pad (Pin 9) on the LTC3547EDDB#TRMPBF is electrically connected to GND and serves dual thermal and electrical functions. It must be soldered to a dedicated PCB thermal pad with ≥4 thermal vias to achieve the specified θJA = 76°C/W. Failure to connect it compromises thermal performance, risks junction temperature exceedance, and may degrade long-term reliability under sustained 300mA loads.
How does Burst Mode® operation improve efficiency in the LTC3547EDDB#TRMPBF?
Burst Mode® operation in the LTC3547EDDB#TRMPBF reduces switching losses at light loads (<10mA) by intermittently activating the power stage while keeping the error amplifier and bias circuits active. Each burst delivers energy to maintain regulation, then enters a low-power sleep interval - achieving >85% efficiency at 100µA load versus <60% in forced continuous mode, with output ripple held to ≤20mVP-P for noise-sensitive applications.
LTC3547EDDB#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)
LTC3547EDDB#TRMPBF FAQ
1.How can I place an order for LTC3547EDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3547EDDB#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 LTC3547EDDB#TRMPBF reliable?
The price and inventory of LTC3547EDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3547EDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3547EDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3547EDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3547EDDB#TRMPBF?
LTC3547EDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3547EDDB#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 LTC3547EDDB#TRMPBF?
For technical support, including LTC3547EDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3547EDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC3547EDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3547EDDB#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 LTC3547EDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3547EDDB#TRMPBF?
All LTC3547EDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3547EDDB#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 LTC3547EDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3547EDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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