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Analog Devices Inc. LTC3548AIDD#TRPBF
- Part No.:
- LTC3548AIDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3548AIDD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,832
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Product details
Overview
LTC3548AIDD#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down DC/DC regulator IC designed for low-power portable systems. It delivers 400mA and 800mA at 2.5V and 1.8V respectively, operates from 2.5V–5.5V input, switches at 2.25MHz, and integrates 0.35Ω P-channel and 0.30Ω N-channel MOSFETs - enabling compact, high-efficiency power conversion in space-constrained applications like digital cameras and cellular handsets.
For engineers reviewing the LTC3548AIDD#TRPBF datasheet, LTC3548AIDD#TRPBF pinout, LTC3548AIDD#TRPBF application, or LTC3548AIDD#TRPBF equivalent, key selection considerations include its dual-output burst-mode efficiency (40μA quiescent current), 100% duty-cycle dropout operation, externally synchronizable 2.25MHz oscillator, Power-On Reset (POR) output, and support for optional soft-start via RUN/SS pins.
Technical Context
The LTC3548AIDD#TRPBF employs a constant-frequency current-mode control architecture with shared 2.25MHz clocking across both channels, ensuring phase-aligned switching and predictable EMI behavior. Its dual independent feedback loops use 0.6V reference voltage with ±0.5% line regulation and ±0.5% load regulation, while overvoltage/undervoltage comparators feed a common-drain POR output with ±8.5% trip threshold and 65,536-cycle release delay.
Operation supports two user-selectable light-load modes via MODE/SYNC pin: Burst Mode® (maximizing efficiency at <1mA loads, IQ = 40μA) and pulse-skipping mode (minimizing output ripple <35mVP-P). In dropout, the P-channel top switch remains fully on (100% duty cycle), and shutdown draws <1μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, and 3.3V/5V rail inputs without external LDO pre-regulation. |
| Switching Frequency | 2.25MHz (typ) - enables use of sub-3mm-height inductors (e.g., 2.2μH/4.7μH) and 10μF ceramic capacitors for ultra-compact layouts. |
| Output Current Capability | Channel 1: 400mA; Channel 2: 800mA - defined by peak switch limits of 0.7A and 1.2A with internal 0.35Ω/0.30Ω RDS(ON). |
| Feedback Reference Voltage | 0.6V (±0.012V over –40°C to 125°C) - sets output range from 0.6V to 5V using external resistor dividers; enables precise low-voltage core supply generation. |
| Quiescent Current | 40μA (Burst Mode®, both channels active) - extends battery runtime in always-on subsystems such as modem standby or sensor wake logic. |
| Shutdown Current | <1μA - ensures negligible drain during system sleep or transport storage; meets stringent OEM battery shelf-life requirements. |
| Power-On Reset Threshold | ±8.5% output deviation - provides deterministic system initialization timing; POR release delayed by ~29ms (pulse-skipping) or variable burst intervals (Burst Mode®). |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = PGND). Thermally enhanced layout requires soldering the exposed pad directly to PCB ground plane for θJA = 45°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistor divider on VOUT1; 0.6V reference sets output voltage; 30nA input bias minimizes divider current loss. |
| RUN/SS1 (Pin 2) | Channel 1 enable & soft-start control | Pull ≥1.5V to enable; pull ≤0.3V to shut down; RC network on this pin controls startup slew rate and inrush limiting. |
| VIN (Pin 3) | Main power input | Supplies both regulators; requires local 10μF ceramic decoupling adjacent to pin to suppress high-frequency switching noise. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; high di/dt demands short, low-inductance PCB trace routing. |
| NC (Pin 5) | No-connect terminal | Internally unconnected; recommended to tie to GND on PCB for EMI shielding and thermal conduction. |
| MODE/SYNC (Pin 6) | Mode selection & external sync input | Tie to VIN for Burst Mode®; tie to GND for pulse-skipping; apply external 2.25MHz clock for synchronization across multiple LTC3548AIDD#TRPBF devices. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1; must be routed separately to avoid crosstalk-induced instability between channels. |
| POR (Pin 8) | Power-On Reset open-drain output | Pulls low when either VOUT1 or VOUT2 deviates >±8.5%; releases after fixed clock cycles only when both outputs are in regulation. |
| RUN/SS2 (Pin 9) | Channel 2 enable & soft-start control | Independent control of second regulator; allows staggered power-up sequencing or dynamic channel disable for power gating. |
| VFB2 (Pin 10) | Channel 2 feedback input | Functionally identical to VFB1; enables independent output voltage programming (e.g., 1.8V + 2.5V) with separate resistor networks. |
| Exposed Pad (Pin 11) | Power ground (PGND) | Mandatory solder connection to PCB ground plane; serves as primary return path for high-current switch nodes and improves thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck topology | Eliminates external Schottky diodes; achieves up to 95% efficiency at full load with integrated 0.35Ω/0.30Ω MOSFETs. |
| Burst Mode® operation | Reduces light-load IQ to 40μA while maintaining regulation - critical for battery-powered devices with intermittent processing bursts. |
| 100% duty-cycle dropout | Enables seamless transition to linear pass-through when VIN approaches VOUT, avoiding sudden output collapse during brownout conditions. |
| Externally synchronizable oscillator | Prevents beat frequencies in multi-rail systems; allows alignment with system clock or other switching regulators to simplify EMI filtering. |
| Independent RUN/SS pins per channel | Supports flexible power sequencing (e.g., VDD_IO before VDD_CORE), dynamic power gating, and fault-isolated shutdown without affecting the other regulator. |
Applications
| Digital Camera Core Power | Cellular Phone Baseband Supply |
|---|---|
Use Scenario: Powers image sensor interface (1.8V) and ISP core (2.5V) in compact camera modules where board area is constrained to <100mm². IC Role / Device Role / Timing Role: Dual-output DC/DC regulator providing tightly regulated, low-noise supplies with independent soft-start to prevent sensor reset glitches during power-up. Use Value: 2.25MHz switching enables use of 2.2μH/4.7μH shielded inductors under 1mm height, reducing total solution volume by >40% vs. 500kHz alternatives. | Use Scenario: Supplies application processor I/O (1.8V) and memory interface (2.5V) in LTE smartphones operating from single-cell Li-ion battery (3.0V–4.2V). IC Role / Device Role / Timing Role: High-efficiency dual buck converter delivering stable rails across wide input range while minimizing heat buildup near sensitive RF sections. Use Value: Burst Mode® extends talk time by 18% at 100μA load vs. pulse-skipping; 40μA quiescent current preserves battery charge during idle screen-off states. |
| Wireless Modem Data Path | PDA System-on-Chip Power |
Use Scenario: Generates clean 1.8V and 2.5V rails for Wi-Fi/BT baseband ICs and RF transceivers in DSL/cable modems requiring low EMI emissions. IC Role / Device Role / Timing Role: Synchronized dual regulator suppressing switching noise harmonics through coordinated 2.25MHz clocking and phase-aligned operation. Use Value: External MODE/SYNC pin allows locking to system master clock, eliminating heterodyne interference in adjacent 2.4GHz/5GHz bands. | Use Scenario: Powers ARM-based SoC with split-core/memory domains in handheld PDAs where thermal envelope limits passive cooling options. IC Role / Device Role / Timing Role: Dual synchronous buck with 100% duty-cycle dropout maintains VDD_CORE at 1.2V even as battery discharges from 4.2V to 3.0V. Use Value: Integrated 0.35Ω/0.30Ω MOSFETs reduce conduction losses by 35% vs. discrete solutions, lowering junction temperature rise by 12°C at 800mA load. |
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 |
|---|---|---|---|
| TPS62125DSCR | Single-output, 3MHz fixed-frequency buck; no POR, no MODE/SYNC, lower max IOUT (300mA); 0.45Ω RDS(ON). | Requires two separate ICs for dual-rail generation; lacks power-good signaling and synchronized operation. | Select only if single-rail simplicity and smaller footprint outweigh need for dual regulation and system-level coordination features. |
| MAX17504ATP+T | Dual-output, 400kHz–2.2MHz adjustable frequency; higher quiescent current (120μA); no Burst Mode®, no POR; 0.025Ω/0.018Ω RDS(ON). | Better thermal performance at high load but inferior light-load efficiency; no built-in reset function for microcontroller boot sequencing. | Prefer for high-current industrial applications where continuous-mode stability matters more than battery life or deterministic reset timing. |
Compared with TPS62125DSCR and MAX17504ATP+T, the LTC3548AIDD#TRPBF uniquely combines dual independent regulation, Burst Mode® efficiency, POR signaling, and external synchronization in a 3mm × 3mm DFN - making it optimal for battery-powered consumer electronics requiring coordinated, low-noise, low-quiescent power delivery.
Availability
LTC3548AIDD#TRPBF is available at Aetrix Electronics and suitable for digital cameras, cellular phones, and wireless modems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC3548AIDD#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 precision instrumentation, communications, and industrial markets.
The LTC3548A series was developed specifically for space-constrained portable electronics needing dual, high-frequency, low-quiescent synchronous buck regulation with integrated power-good signaling and flexible light-load optimization.
FAQ
What is the maximum supported input voltage for the LTC3548AIDD#TRPBF?
The LTC3548AIDD#TRPBF has an absolute maximum VIN rating of 6V, but its specified operating input voltage range is 2.5V to 5.5V. Operation above 5.5V risks permanent damage, and below 2.5V triggers undervoltage lockout. The device shuts down cleanly when VIN drops below ~1.65V to prevent unstable regulation. Always maintain input within 2.5V–5.5V for reliable LTC3548AIDD#TRPBF operation across temperature.
Does the LTC3548AIDD#TRPBF support independent voltage setting for each output?
Yes, the LTC3548AIDD#TRPBF supports fully independent output voltage programming via separate feedback resistive dividers on VFB1 and VFB2. Each channel uses the same 0.6V internal reference, so VOUT1 = 0.6V × (1 + R2/R1) and VOUT2 = 0.6V × (1 + R4/R3). The datasheet confirms operation from 0.6V to 5V per channel, and typical applications show 1.8V/2.5V and 2.5V/1.8V configurations. This independence is maintained across all operating modes including Burst Mode® and pulse-skipping.
How does the POR (Power-On Reset) function work on the LTC3548AIDD#TRPBF?
The POR pin on the LTC3548AIDD#TRPBF is an open-drain output that pulls low whenever either VOUT1 or VOUT2 deviates beyond ±8.5% of its setpoint. Once both outputs stabilize within regulation, a 65,536-cycle timer starts - releasing POR after ~29ms in pulse-skipping mode. In Burst Mode®, the delay varies with burst interval length. The LTC3548AIDD#TRPBF POR is not internally debounced; external RC filtering may be added if system-level noise immunity is required.
Can the LTC3548AIDD#TRPBF be synchronized to an external clock source?
Yes, the MODE/SYNC pin of the LTC3548AIDD#TRPBF accepts an external 2.25MHz square-wave clock signal to synchronize switching across multiple devices. When driven externally, the LTC3548AIDD#TRPBF automatically enters pulse-skipping mode and aligns its top-switch turn-on edge to the rising edge of the applied clock. This eliminates beat frequencies and simplifies EMI filter design in multi-rail systems - a capability confirmed in the "Mode Selection and Frequency Synchronization" section of the official datasheet.
What thermal considerations apply to the LTC3548AIDD#TRPBF in high-current operation?
The LTC3548AIDD#TRPBF has θJA = 45°C/W and θJC = 10°C/W when the exposed pad (Pin 11) is soldered to a solid PCB ground plane. At 800mA output, conduction losses from the 0.30Ω bottom switch generate ~192mW, raising junction temperature by ~8.6°C above ambient. Full thermal derating requires verifying power dissipation using actual RDS(ON) values (which increase with temperature) and ensuring board copper area meets Linear Technology's recommended layout guidelines for the 3mm × 3mm DFN package.
LTC3548AIDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3548AIDD#TRPBF FAQ
1.How can I place an order for LTC3548AIDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548AIDD#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 LTC3548AIDD#TRPBF reliable?
The price and inventory of LTC3548AIDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3548AIDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3548AIDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548AIDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548AIDD#TRPBF?
LTC3548AIDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548AIDD#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 LTC3548AIDD#TRPBF?
For technical support, including LTC3548AIDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548AIDD#TRPBF requirements.
6.How does Aetrix verify that LTC3548AIDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3548AIDD#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 LTC3548AIDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3548AIDD#TRPBF?
All LTC3548AIDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548AIDD#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 LTC3548AIDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3548AIDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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