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Analog Devices Inc. LTC3548EMSE#TRPBF
- Part No.:
- LTC3548EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3548EMSE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,503
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Product details
Overview
LTC3548EMSE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down DC/DC regulator designed for low-power portable electronics. 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 switching frequency, 0.35Ω internal P-channel MOSFET RDS(ON), and supports adjustable output voltages from 0.6V to 5V - used in digital camera power rails and cellular phone baseband supplies.
For engineers reviewing the LTC3548EMSE#TRPBF datasheet, LTC3548EMSE#TRPBF pinout, LTC3548EMSE#TRPBF application, or LTC3548EMSE#TRPBF equivalent, key selection criteria include dual-output burst-mode efficiency at light load, 40μA quiescent current, 100% duty-cycle dropout operation, and MSOP-10 thermal performance with exposed pad grounding.
Technical Context
The LTC3548EMSE#TRPBF implements a constant-frequency current-mode control architecture with shared 2.25MHz oscillator across both channels, enabling precise in-phase switching and fast transient response. Each channel uses internal synchronous P-channel/N-channel MOSFETs with 0.35Ω/0.30Ω RDS(ON), eliminating external Schottky diodes while supporting peak switch currents of 0.7A (Ch1) and 1.2A (Ch2).
Its MODE/SYNC pin provides user-selectable Burst Mode® (for ≤40μA IQ and >95% light-load efficiency) or pulse-skipping mode (for low-noise operation), and enables external synchronization. The device integrates a power-on reset (POR) output with –8.5% undervoltage detection and 117ms timeout, plus independent RUN1/RUN2 enable inputs for sequencing.
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 system rails without pre-regulation. |
| Switching Frequency | 2.25MHz (typ) - enables use of sub-3mm-height inductors and 10μF ceramic output capacitors. |
| Output Current Capability | Channel 1: 400mA; Channel 2: 800mA - defined by internal switch current limits (0.7A/1.2A peak) and thermal design in MSOP-10. |
| Feedback Reference Voltage | 0.600V ±12mV (–40°C to 85°C) - sets output voltage via external resistor divider; enables 0.6V–5V adjustment range. |
| Quiescent Current | 40μA (typ, both channels active) - extends battery runtime in always-on subsystems like modem standby or sensor wake logic. |
| Shutdown Current | <1μA - meets ultra-low leakage requirements for long-term storage or deep-sleep modes. |
| Dropout Operation | 100% duty cycle - maintains regulation down to VIN = VOUT + IOUT × RDS(ON); critical for end-of-battery-life operation. |
Pinout & Package
Package: 10-Lead Plastic MSOP with exposed thermal pad (Pin 11 = PGND). Requires soldering exposed pad to PCB ground plane for thermal and electrical performance (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider; regulates VOUT1 to 0.6V reference; high-impedance (30nA bias). |
| RUN1 (Pin 2) | Channel 1 enable control | Active-high: drive ≥1.5V to enable; ≤0.3V to shut down; must not float. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling to GND. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; high dv/dt node requiring tight layout. |
| GND (Pin 5) | Analog ground reference | Not internally connected; must be tied to PCB ground plane near VIN and SW pins. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tie to VIN for Burst Mode; to GND for pulse-skipping; apply external 2.25MHz clock for synchronization. |
| SW2 (Pin 7) | Channel 2 switch node | Same function as SW1 but for second regulator; share same ground return path. |
| POR (Pin 8) | Power-on reset open-drain output | Pulls low if either VOUT drops >8.5% below target; releases after 117ms in regulation. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable for second channel; identical electrical behavior to RUN1. |
| VFB2 (Pin 10) | Channel 2 feedback input | Identical to VFB1; enables independent output voltage setting for dual-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Reduces quiescent current to 40μA while maintaining >90% efficiency at 1mA load - extends battery life in intermittent-use devices. |
| Synchronous rectification | Eliminates external Schottky diodes using integrated 0.35Ω P-MOS and 0.30Ω N-MOS switches - reduces BOM count and improves thermal performance. |
| 100% duty-cycle dropout | Enables regulation down to VIN − VOUT ≈ 0.35Ω × IOUT - sustains operation during brownout conditions in portable systems. |
| Integrated POR with timeout | Provides system-level reset signal synchronized to both outputs' regulation status - eliminates need for external supervisor IC in space-constrained designs. |
| Externally synchronizable oscillator | Accepts 2.25MHz external clock on MODE/SYNC pin to eliminate beat frequencies in multi-regulator systems - critical for EMI-sensitive RF modules. |
Applications
| Digital Camera Core Power | Cellular Phone Baseband Supply |
|---|---|
Use Scenario: Powers image sensor interface, ISP core, and memory controller in compact digital cameras with single Li-ion cell input. IC Role / Device Role / Timing Role: Dual-output regulator delivering 1.8V/2.5V simultaneously with independent enable control and sequencing. Use Value: 2.25MHz switching allows <1mm-height inductors and small 10μF ceramic caps - essential for thin camera modules. | Use Scenario: Supplies baseband processor (1.2V) and RF transceiver (2.8V) in GSM/UMTS handsets operating from 3.4–4.2V battery. IC Role / Device Role / Timing Role: High-efficiency dual buck converter with Burst Mode for standby and pulse-skipping for active call mode. Use Value: 40μA quiescent current extends talk time; 100% duty cycle maintains regulation down to 2.9V battery voltage. |
| Portable Media Player Audio Codec | Wireless Modem Interface Rail |
Use Scenario: Generates clean 1.8V analog supply and 3.3V I/O rail for audio codec in MP3 players with flash storage. IC Role / Device Role / Timing Role: Dual-channel regulator with low-noise pulse-skipping mode selected via MODE/SYNC pin for analog section. Use Value: <100mV output ripple at full load ensures SNR >95dB in audio DAC paths without additional LDO post-regulation. | Use Scenario: Provides 1.8V logic and 3.3V USB PHY supply in 802.11b/g wireless modems powered from 5V USB or battery. IC Role / Device Role / Timing Role: Synchronous buck regulator with POR output used to hold modem in reset until both rails stabilize. Use Value: Integrated POR eliminates discrete reset IC; exposed-pad MSOP package supports 1.5W continuous dissipation at 70°C ambient. |
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 |
|---|---|---|---|
| TPS62400DRVR | 2.25MHz switching, 600mA/600mA dual output, 22μA IQ, no integrated POR, DSBGA-16 package | Lacks power-on reset output; lower max output current per channel; smaller footprint but higher thermal resistance | Select when POR is implemented externally and board area is constrained more than thermal budget. |
| MAX8646ETE+ | 3MHz switching, 600mA/600mA dual output, 30μA IQ, integrated I2C interface, TQFN-16 package | Requires I2C configuration; higher switching frequency increases EMI risk; no MODE pin for manual burst/pulse selection | Select when dynamic voltage scaling or remote enable/disable via I2C is required over manual pin control. |
Compared with TPS62400DRVR and MAX8646ETE+, the LTC3548EMSE#TRPBF offers unique integration of POR, manual MODE/SYNC selection, and robust 400mA/800mA asymmetric current capability in thermally enhanced MSOP - making it optimal for cost-sensitive, space-constrained portable designs needing deterministic reset behavior and simple analog control.
Availability
LTC3548EMSE#TRPBF is available at Aetrix Electronics and suitable for digital camera power management, cellular phone baseband supplies, and portable media player audio codec rails requiring stable component supply across production lifecycles.
Supply support for LTC3548EMSE#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 and maintains its precision analog and power management product lines with full datasheet, simulation model, and application support.
The LTC3548EMSE#TRPBF belongs to Linear's high-frequency synchronous buck regulator family, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, small solution size, and dual-rail flexibility.
FAQ
What is the maximum output current supported by each channel of the LTC3548EMSE#TRPBF?
The LTC3548EMSE#TRPBF supports up to 400mA on Channel 1 and 800mA on Channel 2 under typical thermal conditions in the MSOP-10 package. These values derive from the internal peak switch current limits of 0.7A (Ch1) and 1.2A (Ch2), combined with thermal limits (θJA = 45°C/W) and recommended PCB layout with exposed pad grounding. Derating is required above 70°C ambient temperature.
How does the MODE/SYNC pin affect the operation of the LTC3548EMSE#TRPBF?
The MODE/SYNC pin on the LTC3548EMSE#TRPBF selects between Burst Mode® (tie to VIN) for ultra-low IQ and high light-load efficiency, or pulse-skipping mode (tie to GND) for minimal output voltage ripple. When driven by an external 2.25MHz clock, it forces pulse-skipping mode and synchronizes both channels to the external source - preventing beat frequencies in multi-regulator systems.
Can the LTC3548EMSE#TRPBF operate with only one channel enabled?
Yes, the LTC3548EMSE#TRPBF supports independent channel control: pulling RUN1 low disables Channel 1 while Channel 2 remains active, and vice versa. When one channel is disabled, its associated feedback and switch nodes enter high-impedance states, and the POR output goes low - ensuring system reset unless both channels are regulated and enabled.
What is the purpose of the exposed pad (Pin 11) on the LTC3548EMSE#TRPBF MSOP package?
The exposed pad (Pin 11) on the LTC3548EMSE#TRPBF is designated PGND and must be soldered to a large PCB ground plane. It serves as the primary thermal path (θJC = 10°C/W) and low-inductance power ground return for both switch nodes and internal MOSFET sources - critical for achieving rated current, minimizing EMI, and maintaining stability in high-frequency operation.
Does the LTC3548EMSE#TRPBF require external compensation components?
No, the LTC3548EMSE#TRPBF features fully internal compensation - no external RC networks are needed for loop stability. Its current-mode architecture with built-in slope compensation and optimized error amplifier response enables stable operation with standard ceramic output capacitors (10μF typical) and inductors (2.2μH–4.7μH), simplifying design and reducing bill-of-materials cost.
LTC3548EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3548EMSE#TRPBF FAQ
1.How can I place an order for LTC3548EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548EMSE#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 LTC3548EMSE#TRPBF reliable?
The price and inventory of LTC3548EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3548EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3548EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548EMSE#TRPBF?
LTC3548EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548EMSE#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 LTC3548EMSE#TRPBF?
For technical support, including LTC3548EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3548EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3548EMSE#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 LTC3548EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3548EMSE#TRPBF?
All LTC3548EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548EMSE#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 LTC3548EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3548EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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