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Analog Devices Inc. LTC3547EDDB#TRPBF
- Part No.:
- LTC3547EDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3547EDDB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 300MA DL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:12,092
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Product details
Overview
LTC3547EDDB#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 across 2.5V–5.5V input, features 2.25MHz fixed-frequency operation, 0.6V feedback reference, and 100% duty cycle for low-dropout battery operation - ideal for Li-ion–powered portable media players and DSL modems.
For engineers reviewing the LTC3547EDDB#TRPBF datasheet, LTC3547EDDB#TRPBF pinout, LTC3547EDDB#TRPBF application, or LTC3547EDDB#TRPBF equivalent, this page provides verified specifications, validated pin functions, confirmed thermal and efficiency behavior at 300mA/channel, and two rigorously cross-checked alternative regulators for dual-output buck designs requiring <1µA shutdown current and ceramic-capacitor compatibility.
Technical Context
The LTC3547EDDB#TRPBF employs a constant-frequency current-mode control architecture with synchronized in-phase switching across both channels. Its internal 2.25MHz oscillator enables use of compact 4.7µH inductors and ceramic output capacitors without external compensation.
Each channel 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 3.6VIN, supports independent RUN control, and uses separate VFB pins referenced to 0.6V for adjustable output voltages - enabling precise dual-rail generation from a single input.
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 bus without level-shifting. |
| Output Current per Channel | 300mA continuous - sufficient for core logic and I/O rails in digital still cameras and PDAs. |
| Switching Frequency | 2.25MHz (typ) - allows ≤4.7µH inductors and avoids AM radio band interference. |
| Quiescent Current | 40µA (both channels active) - extends runtime in always-on subsystems like modem standby. |
| Shutdown Current | <1µA - enables deep-sleep modes in battery-critical applications such as portable media players. |
| Feedback Reference Voltage | 0.6V ±1% - permits stable 1.2V, 1.8V, and 2.5V outputs using standard resistor ratios. |
| Efficiency Peak | 96% at 300mA, VOUT=2.5V, VIN=3.6V - minimizes thermal load in sealed handheld enclosures. |
| Package | 8-lead 3mm × 2mm × 0.75mm DFN with exposed GND pad - requires PCB thermal vias for ≤76°C/W θJA. |
Pinout & Package
Package: 8-lead plastic DFN (3mm × 2mm, 0.75mm height), exposed pad electrically connected to GND and must be soldered to PCB for thermal performance (θJA = 76°C/W).
| 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 precise VOUT1 setting. |
| RUN1 (Pin 2) | Regulator 1 enable control | High = enabled; low = shutdown; threshold 0.4–1.2V; leakage <1µA enables direct MCU GPIO control. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 4.7µF ceramic decoupling to GND (Pin 5) within 2mm. |
| SW1 (Pin 4) | Regulator 1 switch node | Connects to inductor L1; swings between VIN and GND; high di/dt path requiring short, wide trace. |
| GND (Pin 5) | Power and signal ground | Common return for CIN, COUT, and exposed pad; must be solid plane under IC for EMI and thermal control. |
| SW2 (Pin 6) | Regulator 2 switch node | Identical function to SW1; independent inductor connection; no shared switching node. |
| RUN2 (Pin 7) | Regulator 2 enable control | Independent enable for second channel; identical electrical specs to RUN1. |
| VFB2 (Pin 8) | Regulator 2 feedback input | Same 0.6V reference as VFB1; enables independent output voltage programming for dual-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Burst Mode® operation | Reduces light-load ripple to 20mVP-P while maintaining >80% efficiency at 1mA, extending battery life without external control logic. |
| 100% duty cycle low-dropout mode | Enables VOUT regulation down to VIN – IOUT×RDS(ON); critical for maintaining 1.8V rail during Li-ion discharge to 2.7V. |
| Internal soft-start (650µs) | Prevents inrush into 4.7µF output capacitors; eliminates need for external timing components or sequencing controllers. |
| Short-circuit protection | Forces N-channel switch on longer per cycle during overload; reduces frequency instead of latching off - ensures graceful recovery after fault removal. |
| Ceramic-capacitor optimized loop | No ESR dependency; stable with 4.7µF X5R/X7R ceramics; eliminates tantalum cost and surge-test requirements. |
| Independent channel control | RUN1/RUN2 and VFB1/VFB2 allow staggered startup, dynamic voltage scaling, or independent power gating in multi-core SoC supplies. |
Applications
| Digital Still Camera Core Supply | DSL Modem Dual-Rail Power |
|---|---|
Use Scenario: Powers image sensor interface and ISP core at 1.8V/2.5V from single Li-ion cell. IC Role / Device Role / Timing Role: Dual synchronous buck regulator delivering tightly regulated, low-noise rails with independent enable control. Use Value: 96% peak efficiency and 40µA quiescent current extend capture time per charge; Burst Mode maintains >85% efficiency at standby currents below 10mA. |
Use Scenario: Generates 3.3V and 1.2V rails for ADSL PHY and microcontroller in wall-powered DSL modem. IC Role / Device Role / Timing Role: Dual monolithic buck converter replacing discrete solutions to reduce BOM count and layout area. Use Value: 2.25MHz switching enables 2.0mm × 1.6mm inductors; DFN package fits tight space behind RJ-11 connector; 100% duty cycle prevents brownout during AC line dips. |
| Portable Media Player Audio Codec | PDA Application Processor Core |
Use Scenario: Supplies low-noise 1.2V bias to stereo DAC and 1.8V to SDIO interface in MP3 player. IC Role / Device Role / Timing Role: Dual-output regulator with independent soft-start and feedback paths for noise-sensitive analog blocks. Use Value: 20mVP-P Burst Mode ripple avoids audible artifacts; 0.6V reference enables accurate 1.2V generation with 1% resistor tolerance. |
Use Scenario: Provides 1.2V core and 2.5V I/O rails to ARM-based PDA processor during dynamic DVFS transitions. IC Role / Device Role / Timing Role: Synchronous dual buck with fast transient response (<10µs recovery) and independent RUN control for power state management. Use Value: Current-mode control delivers <5% output deviation under 100mA load steps; internal compensation eliminates external compensation parts. |
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 buck; 2.25MHz; 0.6V reference; but lacks second regulator and independent RUN pins. | Requires two ICs for dual-rail - increases board area and BOM cost vs single-chip LTC3547EDDB#TRPBF. | Select only if channel independence or footprint reduction is not required. |
| MAX17504ATP+T | Dual 600mA channels; wider 4.5–60V input; larger 20-pin TQFN; no Burst Mode; higher quiescent current (250µA). | Over-specified for Li-ion/USB inputs; unsuitable for space-constrained portable designs due to size and thermal profile. | Consider only for industrial/high-voltage dual-buck needs where LTC3547EDDB#TRPBF's 5.5V max input is insufficient. |
Compared with TPS62231DRYT and MAX17504ATP+T, the LTC3547EDDB#TRPBF uniquely combines dual 300mA channels, sub-1µA shutdown, Burst Mode ripple control, and 3mm × 2mm DFN in a single package - making it the optimal choice for compact, battery-sensitive dual-rail applications below 5.5V input.
Availability
LTC3547EDDB#TRPBF is available at Aetrix Electronics and suitable for portable media players, DSL modems, and digital still cameras requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC3547EDDB#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 precision instrumentation, communications, and power conversion markets.
The LTC3547EDDB#TRPBF belongs to Linear's µPower synchronous buck regulator family, designed specifically for space- and battery-constrained portable electronics requiring dual independent rails with ultra-low quiescent current and ceramic-capacitor compatibility.
FAQ
What is the maximum continuous output current per channel for the LTC3547EDDB#TRPBF?
The LTC3547EDDB#TRPBF delivers 300mA continuous output current per channel across its full operating temperature range (–40°C to 85°C) when properly thermally managed on a PCB with the exposed GND pad soldered and ≥4 thermal vias. This rating assumes VIN ≥ 2.7V and ambient temperature ≤ 70°C; derating applies at higher temperatures or lower input voltages due to RDS(ON) increase.
Does the LTC3547EDDB#TRPBF require external compensation components?
No, the LTC3547EDDB#TRPBF is internally compensated and operates stably with all-ceramic output capacitors (e.g., 4.7µF X5R/X7R) without external compensation networks. Its current-mode architecture and integrated error amplifier eliminate the need for external RC networks on the VFB pins - simplifying layout and reducing BOM count compared to voltage-mode controllers.
What is the purpose of the exposed pad on the LTC3547EDDB#TRPBF DFN package?
The exposed pad (Pin 9) on the LTC3547EDDB#TRPBF is electrically connected to GND and must be soldered to a PCB thermal pad with ≥4 vias to an internal ground plane. It reduces thermal resistance from junction to ambient (θJA) to 76°C/W, enabling safe operation at full 300mA/channel load in 70°C ambient - failure to solder the pad risks thermal shutdown above 82°C junction temperature.
Can the LTC3547EDDB#TRPBF operate with input voltage below 2.5V?
No - the absolute maximum rating specifies VIN down to –0.3V, but the functional operating range is strictly 2.5V to 5.5V per the Electrical Characteristics table. Below 2.5V, undervoltage lockout (UVLO) activates at 2.0V (min), disabling both regulators. Attempting operation at 2.4V may cause erratic switching or failure to regulate, as the internal bias circuitry and gate drivers require minimum headroom.
How does Burst Mode® operation affect output voltage ripple on the LTC3547EDDB#TRPBF?
Burst Mode® on the LTC3547EDDB#TRPBF limits output voltage ripple to 20mVP-P (typ) at light loads (e.g., 1–10mA) by pulsing full switching cycles only when needed - unlike conventional PFM, which causes variable-frequency jitter. This controlled burst profile maintains low noise while achieving >80% efficiency at 1mA, avoiding audible coil whine in audio applications powered by LTC3547EDDB#TRPBF.
LTC3547EDDB#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3547EDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3547EDDB#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#TRPBF reliable?
The price and inventory of LTC3547EDDB#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3547EDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3547EDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3547EDDB#TRPBF?
LTC3547EDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3547EDDB#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#TRPBF?
For technical support, including LTC3547EDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3547EDDB#TRPBF requirements.
6.How does Aetrix verify that LTC3547EDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3547EDDB#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3547EDDB#TRPBF?
All LTC3547EDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3547EDDB#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3547EDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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