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Analog Devices Inc. LTC3548IDD#PBF
- Part No.:
- LTC3548IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3548IDD#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,625
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Product details
Overview
LTC3548IDD#PBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down DC/DC regulator designed for low-power portable systems. It operates from 2.5V to 5.5V input, delivers up to 400mA on Channel 1 and 800mA on Channel 2, features 2.25MHz fixed-frequency switching, and integrates 0.35Ω P-channel and 0.30Ω N-channel MOSFETs - enabling compact 3mm × 3mm DFN designs for battery-powered digital cameras and cellular handsets.
For engineers reviewing the LTC3548IDD#PBF datasheet, LTC3548IDD#PBF pinout, LTC3548IDD#PBF application, or LTC3548IDD#PBF equivalent, key selection considerations include its dual-output adjustable regulation (0.6V–5V), Burst Mode® vs pulse-skipping mode trade-offs, 40μA quiescent current, Power-On Reset (POR) output, and synchronization capability via MODE/SYNC pin - all critical for space-constrained, battery-life-sensitive designs.
Technical Context
The LTC3548IDD#PBF employs a constant-frequency current-mode control architecture with shared 2.25MHz oscillator across both channels, enabling precise timing alignment and simplified EMI filtering. Its dual independent feedback loops (VFB1/VFB2) each reference a trimmed 0.6V internal bandgap, supporting independent output voltage programming via external resistor dividers.
Operation includes three distinct low-power states: active continuous conduction mode (CCM), user-selectable Burst Mode® (for <1μA shutdown IQ and peak efficiency at light loads), and pulse-skipping mode (for ultra-low output ripple). The integrated POR circuit asserts an open-drain signal after 262,144 clock cycles (~117ms) once both outputs stabilize within –8.5% of regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, or triple-AA alkaline inputs without pre-regulation. |
| Switching Frequency | 2.25MHz (typical) - enables use of sub-3mm-height inductors and ≤10μF ceramic output capacitors. |
| Output Current Capability | Channel 1: 400mA; Channel 2: 800mA - defined by internal 0.7A/1.2A peak switch current limits. |
| Feedback Reference Voltage | 0.600V ±12mV (–40°C to 85°C) - sets output accuracy and enables 0.6V–5V adjustable range with standard resistor tolerances. |
| Quiescent Current | 40μA (typical, both channels active) - extends runtime in always-on subsystems like baseband processors or sensor hubs. |
| Shutdown Current | <1μA - meets stringent leakage requirements for long-term storage or deep-sleep modes. |
| Power-On Reset Threshold | –8.5% of VOUT - provides reliable system-level reset signaling when either output falls out of regulation. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN with exposed power ground pad (Pin 11), rated for –40°C to 85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 Feedback Input | Connects to resistor divider midpoint; regulates VOUT1 to 0.6V reference - determines output voltage via R1/R2 ratio. |
| RUN1 (Pin 2) | Channel 1 Enable Control | High = enable; low = shutdown - must be actively driven; floating causes undefined behavior. |
| VIN (Pin 3) | Main Power Input | Supplies both regulators; requires local 10μF ceramic decoupling to minimize high-frequency noise coupling. |
| SW1 (Pin 4) | Channel 1 Switch Node | Connects to inductor; swings between VIN and GND - layout must minimize loop area to reduce EMI. |
| GND (Pin 5) | Analog Ground Reference | Not internally connected; serves as shield and return path - must tie to PCB ground plane under IC. |
| MODE/SYNC (Pin 6) | Mode Selection & Sync Input | Ground = pulse-skipping; VIN = Burst Mode®; external clock = forced sync - also disables Burst Mode during sync. |
| SW2 (Pin 7) | Channel 2 Switch Node | Independent switch node for second buck stage - requires separate inductor and output filter. |
| POR (Pin 8) | Power-On Reset Output | Open-drain logic signal pulled low if either VOUT drops >8.5% - used to hold microcontroller in reset until stable. |
| RUN2 (Pin 9) | Channel 2 Enable Control | Functionally identical to RUN1 - allows independent sequencing or disable of second regulator. |
| VFB2 (Pin 10) | Channel 2 Feedback Input | Identical role to VFB1 - enables independent voltage setting for second output rail. |
| Exposed Pad (Pin 11) | Power Ground (PGND) | Mandatory solder connection to PCB ground plane - critical for thermal dissipation and noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Synchronous Buck Architecture | Eliminates external Schottky diodes; achieves >95% peak efficiency with integrated 0.35Ω/0.30Ω MOSFETs. |
| Burst Mode® Operation | Reduces quiescent current to 40μA while maintaining regulation - extends battery life in standby without sacrificing wake-up speed. |
| Externally Synchronizable Oscillator | Accepts 2.25MHz external clock on MODE/SYNC pin - eliminates beat frequencies in multi-rail systems and simplifies EMI compliance testing. |
| 100% Duty Cycle Dropout Support | Enables VOUT ≈ VIN − IOUT × RDS(ON) operation - maintains regulation down to input voltages near output level. |
| Integrated Power-On Reset (POR) | Provides system-level reset assertion with 117ms delay after regulation - replaces discrete reset ICs in space-constrained designs. |
Applications
| Digital Camera Core Power | Cellular Phone Baseband Supply |
|---|---|
Use Scenario: Dual-rail power for image sensor (1.8V) and ISP processor (2.5V) in compact handheld cameras. IC Role / Device Role / Timing Role: LTC3548IDD#PBF provides independently regulated, low-noise, high-efficiency DC/DC conversion with synchronized switching to minimize beat interference. Use Value: Enables use of tiny 2.2μH/4.7μH inductors and 10μF ceramic caps - reducing total solution footprint by >40% vs legacy solutions. | Use Scenario: Simultaneous 1.2V core and 2.8V RF transceiver supply in GSM/UMTS handsets with strict EMI limits. IC Role / Device Role / Timing Role: LTC3548IDD#PBF delivers tightly regulated outputs with externally synchronized 2.25MHz clocks to avoid band-specific interference. Use Value: Burst Mode® operation extends talk time by 18% over comparable 1.5MHz converters at 10mA load, per typical efficiency curves. |
| Portable Media Player Audio Codec | Wireless Modem Application Processor |
Use Scenario: Low-ripple 3.3V analog supply and 1.5V digital core for high-fidelity audio codec ICs. IC Role / Device Role / Timing Role: LTC3548IDD#PBF operates in pulse-skipping mode (MODE/SYNC = GND) to suppress switching noise in sensitive analog paths. Use Value: Achieves <20mVpp output ripple at 80mA load - meeting SNR requirements for 24-bit DACs without additional LDO post-regulation. | Use Scenario: Dual-core application processor (1.1V CPU + 1.8V I/O) in LTE/Wi-Fi modems requiring fast transient response. IC Role / Device Role / Timing Role: LTC3548IDD#PBF uses current-mode control and 2.25MHz frequency to deliver <50μs recovery from 100mA load steps. Use Value: Maintains <±1.5% output deviation during 200mA step transients - eliminating need for oversized output capacitance. |
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 |
|---|---|---|---|
| TPS62400DRCT | 2.25MHz switching, but only 600mA per channel; no integrated POR; 0.8V fixed reference (not 0.6V). | Lacks power-good signaling and tighter VREF - requires external reset IC and higher feedback resistors for 0.6V-based designs. | Choose when POR is unnecessary and cost is prioritized over design simplicity. |
| MAX17504ATP+T | Higher 4.5A per channel, 400kHz–2.2MHz programmable frequency; larger 20-pin TQFN; no Burst Mode®. | Designed for high-current industrial loads - over-specified size/power for portable battery applications. | Choose only for systems needing >800mA per rail and accepting larger board area and higher IQ. |
Compared with TPS62400DRCT and MAX17504ATP+T, the LTC3548IDD#PBF uniquely combines dual 400mA/800mA capability, integrated POR, 0.6V reference, and Burst Mode® in a 3mm × 3mm DFN - making it optimal for space- and battery-life-constrained portable electronics where system-level integration reduces BOM count.
Availability
LTC3548IDD#PBF is available at Aetrix Electronics and suitable for digital camera power management, cellular phone baseband supplies, and portable media player audio subsystems requiring stable component supply across production lifecycles.
Supply support for LTC3548IDD#PBF 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.
The LTC3548IDD#PBF belongs to Linear's µPower DC/DC converter family, engineered specifically for ultra-low-quiescent-current, high-efficiency power conversion in battery-powered portable electronics - emphasizing small size, thermal robustness, and system-level integration.
FAQ
What is the maximum output current supported by each channel of the LTC3548IDD#PBF?
The LTC3548IDD#PBF supports up to 400mA on Channel 1 and 800mA on Channel 2 under typical conditions. These values derive from its internal peak switch current limits of 0.7A (Ch1) and 1.2A (Ch2), factoring in duty cycle, thermal derating, and inductor saturation. Actual achievable current depends on input/output voltage differential, ambient temperature, and PCB copper area - with full-rated output sustained only when junction temperature remains below 125°C.
How does the MODE/SYNC pin affect LTC3548IDD#PBF operation in Burst Mode® versus pulse-skipping mode?
When MODE/SYNC is tied to VIN, the LTC3548IDD#PBF enters Burst Mode®, minimizing quiescent current to 40μA by gating entire switching cycles - ideal for battery longevity but increasing output ripple. When MODE/SYNC is grounded, it operates in pulse-skipping mode, maintaining 2.25MHz switching down to light loads with lower ripple but higher IQ (~60μA). During external synchronization, pulse-skipping is enforced regardless of pin voltage.
Can the LTC3548IDD#PBF operate with input voltages below 2.5V?
No - the LTC3548IDD#PBF has a specified minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Below this, undervoltage lockout disables operation to prevent unstable regulation or erroneous POR behavior. The device incorporates an internal UVLO threshold of ~1.65V, but functional operation is not guaranteed below 2.5V, and performance parameters (efficiency, load regulation, etc.) are not characterized in that region.
What is the purpose and timing behavior of the POR pin on the LTC3548IDD#PBF?
The POR (Power-On Reset) pin on the LTC3548IDD#PBF is an open-drain output that pulls low whenever either regulated output falls more than 8.5% below its target voltage. Once both outputs remain within regulation for 262,144 oscillator cycles (~117ms at 2.25MHz), POR releases high. In Burst Mode®, this delay may extend significantly due to intermittent clocking - a known behavior documented in the Applications Information section.
Is the LTC3548IDD#PBF pin-compatible with other variants in the LTC3548 family, such as the MSOP-packaged versions?
Yes - the LTC3548IDD#PBF (10-lead DFN) shares identical pin numbering, function mapping, and electrical characteristics with the MSOP-packaged LTC3548IMSE#PBF and LTC3548EMSE#PBF. Both packages use the same 10-pin topology and expose PGND on the bottom pad (DFN) or Pin 11 (MSOP), allowing direct PCB footprint substitution where thermal and height constraints permit.
LTC3548IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Buck-Boost
- 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):
- 5V
- Current - Output:
- 400mA, 800mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3548IDD#PBF FAQ
1.How can I place an order for LTC3548IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548IDD#PBF 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 LTC3548IDD#PBF reliable?
The price and inventory of LTC3548IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3548IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3548IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548IDD#PBF?
LTC3548IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548IDD#PBF 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 LTC3548IDD#PBF?
For technical support, including LTC3548IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548IDD#PBF requirements.
6.How does Aetrix verify that LTC3548IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3548IDD#PBF 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 LTC3548IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3548IDD#PBF?
All LTC3548IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548IDD#PBF, 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 LTC3548IDD#PBF part is unused and in its original packaging.
Return procedure for LTC3548IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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