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Analog Devices Inc. LTC3548IMSE#TRPBF
- Part No.:
- LTC3548IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3548IMSE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,650
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Product details
Overview
LTC3548IMSE#TRPBF 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, integrated 0.35Ω P-channel and 0.30Ω N-channel MOSFETs, and supports adjustable output voltages from 0.6V to 5V - used in digital cameras and cellular phones for efficient dual-rail power conversion.
For engineers reviewing the LTC3548IMSE#TRPBF datasheet, LTC3548IMSE#TRPBF pinout, LTC3548IMSE#TRPBF application, or LTC3548IMSE#TRPBF equivalent, key selection criteria include its dual-output capability with independent enable pins (RUN1/RUN2), Burst Mode® vs pulse-skipping mode selection via MODE/SYNC, Power-On Reset (POR) output with –8.5% undervoltage detection, and thermal performance in the 10-lead MSOP package with exposed pad.
Technical Context
The LTC3548IMSE#TRPBF uses a constant-frequency current-mode control architecture with shared 2.25MHz oscillator across both channels, enabling tight regulation and fast transient response. Each channel employs internal synchronous rectification with P-channel high-side and N-channel low-side switches, eliminating external Schottky diodes and supporting 100% duty-cycle dropout operation.
Its MODE/SYNC pin serves dual functions: selecting between Burst Mode® (for <40μA quiescent current at light loads) and pulse-skipping mode (for low-noise operation), and synchronizing switching frequency to an external clock. The POR output provides open-drain reset signaling with 117ms delay after both outputs achieve 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 3.3V/5V system rails without external LDO pre-regulation. |
| Switching Frequency | 2.25MHz (typical) - enables use of sub-3mm-height inductors and ceramic capacitors ≤10μF for ultra-thin portable designs. |
| Output Current Capability | Channel 1: 400mA; Channel 2: 800mA - defined by peak switch current limits of 0.7A and 1.2A respectively. |
| Feedback Reference Voltage | 0.6V (±2% over –40°C to 85°C) - sets output voltage via external resistor divider; enables precise low-voltage rails (e.g., 1.2V, 1.8V, 2.5V). |
| Quiescent Current | 40μA (typical, both channels active) - extends battery life in always-on subsystems such as baseband processors or sensor interfaces. |
| Shutdown Current | <1μA - ensures negligible battery drain during system sleep or standby modes. |
| Power-On Reset Threshold | –8.5% of regulated output - triggers POR low when either output falls below regulation; releases after 262,144 clock cycles (~117ms). |
Pinout & Package
Package: 10-Lead Plastic MSOP with exposed pad (Pin 11 = PGND), rated for –40°C to 85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider; regulates VOUT1 to 0.6V reference - determines output voltage accuracy and loop stability. |
| RUN1 (Pin 2) | Channel 1 enable control | High = enable; low = shutdown - allows independent sequencing and power gating of each rail. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling to minimize high-frequency noise coupling. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings from VIN to GND - critical for EMI layout; must be short, low-inductance trace. |
| GND (Pin 5) | Analog ground reference | Not internally connected; must tie to PCB ground plane - separates analog sensing from power return paths. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | VIN = Burst Mode®; GND = pulse-skipping; external clock = synchronization - configures efficiency/noise trade-off. |
| SW2 (Pin 7) | Channel 2 switch node | Independent switch node for second inductor - enables dual-output design without cross-coupling. |
| POR (Pin 8) | Open-drain power-on reset | Pulled low if either output is out-of-regulation; releases after 117ms stable operation - used for microcontroller reset sequencing. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable for second channel - supports staggered startup or dynamic rail disable. |
| VFB2 (Pin 10) | Channel 2 feedback input | Identical function to VFB1 - enables independent output voltage programming for asymmetric rail requirements. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck topology | Eliminates external Schottky diodes; achieves up to 95% efficiency with integrated 0.35Ω/0.30Ω MOSFETs - reduces BOM count and board area. |
| Burst Mode® operation | Reduces quiescent current to 40μA while maintaining regulation - extends runtime in battery-powered standby states (e.g., camera preview mode). |
| 100% duty-cycle dropout | Enables VOUT ≈ VIN – IOUT × RDS(ON) - sustains output during brownout conditions without rail collapse (e.g., Li-ion discharge down to 2.8V). |
| Externally synchronizable oscillator | Accepts 2.25MHz external clock on MODE/SYNC pin - eliminates beat frequencies in multi-regulator systems and simplifies EMI filtering. |
| Power-On Reset (POR) with timer | Guarantees 117ms reset hold time after regulation - ensures reliable microcontroller initialization even under slow battery ramp-up. |
Applications
| Digital Camera Core Logic | Cellular Phone Baseband |
|---|---|
Use Scenario: Powers image signal processor (ISP) core and memory interface at 1.2V/1.8V simultaneously during video capture. IC Role / Device Role / Timing Role: Dual-output regulator providing tightly tracked, low-noise rails with independent enable control for power sequencing. Use Value: Enables burst-mode efficiency during idle periods and pulse-skipping mode during active capture - reducing thermal load while meeting 20mVpp ripple requirement. | Use Scenario: Supplies application processor (AP) and modem subsystems in LTE smartphones with separate 1.1V and 2.8V rails. IC Role / Device Role / Timing Role: Synchronous buck converter delivering high-current, low-ESR outputs with POR-driven system reset coordination. Use Value: Achieves >90% efficiency at 600mA load while maintaining <100mV droop during 400mA load transients - meeting 3GPP thermal envelope constraints. |
| Portable Media Player Audio Codec | Wireless Modem RF Front-End |
Use Scenario: Generates clean 3.3V and 1.8V supplies for audio DAC/ADC and DSP in MP3 players. IC Role / Device Role / Timing Role: Dual-channel DC/DC with low output ripple and fast transient response for analog-sensitive signal chains. Use Value: Pulse-skipping mode suppresses switching noise near audio band; 0.6V reference enables accurate low-voltage biasing of op-amps and filters. | Use Scenario: Powers PA driver and transceiver ICs in 802.11n Wi-Fi modules requiring stable 3.3V and 1.2V rails. IC Role / Device Role / Timing Role: High-efficiency synchronous regulator with thermal-aware layout (exposed pad to GND) for compact RF module integration. Use Value: 2.25MHz operation avoids interference with 2.4GHz ISM band; 40μA quiescent current extends battery life during deep-sleep beacon intervals. |
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 | Single-channel, 600mA, 2.25MHz; no POR or MODE/SYNC pin; lower IQ (22μA) | Lacks dual-output capability and power-good signaling - requires two devices for same functionality | Select only if single-rail operation suffices and POR is handled externally |
| MAX8646ETE+ | Dual-channel, 600mA/600mA, 2.25MHz; includes I²C interface; higher IQ (80μA) | Supports programmable output voltages and sequencing via I²C - adds firmware dependency and layout complexity | Prefer when dynamic voltage scaling or telemetry is required; avoid for cost-sensitive fixed-rail designs |
Compared with TPS62400DRVR and MAX8646ETE+, the LTC3548IMSE#TRPBF uniquely integrates dual independent regulators with POR, MODE/SYNC flexibility, and ultra-low 40μA quiescent current - making it optimal for space-constrained, battery-operated dual-rail systems where simplicity and efficiency are prioritized over programmability.
Availability
LTC3548IMSE#TRPBF is available at Aetrix Electronics and suitable for digital cameras, cellular phones, and wireless modems requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LTC3548IMSE#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 full product support, documentation, and manufacturing continuity for all Linear legacy parts.
The LTC3548IMSE#TRPBF belongs to Linear's high-frequency synchronous buck regulator family, engineered specifically for ultra-thin portable electronics demanding dual-rail efficiency, minimal external components, and robust power sequencing.
FAQ
What is the maximum output current supported by each channel of the LTC3548IMSE#TRPBF?
The LTC3548IMSE#TRPBF supports up to 400mA on Channel 1 and 800mA on Channel 2, determined by internal peak switch current limits of 0.7A and 1.2A respectively. These values assume proper thermal management using the exposed pad and recommended PCB layout per the datasheet. Exceeding these currents risks thermal shutdown or reduced efficiency due to RDS(ON) increase with junction temperature.
How does the MODE/SYNC pin affect the operation of the LTC3548IMSE#TRPBF?
The MODE/SYNC pin on the LTC3548IMSE#TRPBF selects between Burst Mode® (when tied to VIN) for ultra-low quiescent current (~40μA), and pulse-skipping mode (when tied to GND) for minimal output voltage ripple. It also accepts an external 2.25MHz clock for synchronization - automatically forcing pulse-skipping mode during sync to ensure deterministic timing.
Can the LTC3548IMSE#TRPBF operate with input voltage below 2.5V?
No - the LTC3548IMSE#TRPBF has a specified minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this threshold may cause undervoltage lockout activation or unstable regulation. The device incorporates UVLO that disables switching when VIN drops below ~1.65V, but functional operation is only guaranteed from 2.5V to 5.5V.
What is the purpose of the exposed pad (Pin 11) on the LTC3548IMSE#TRPBF MSOP package?
The exposed pad (Pin 11) on the LTC3548IMSE#TRPBF is designated PGND and must be soldered to the PCB ground plane. It serves as the primary thermal path - reducing θJA from 45°C/W to ~35°C/W when properly connected - and provides low-inductance power ground return for both switch nodes (SW1/SW2), improving EMI performance and transient response.
Does the LTC3548IMSE#TRPBF provide power-good signaling for system sequencing?
The LTC3548IMSE#TRPBF does not include dedicated power-good (PGOOD) pins, but provides POR (Power-On Reset) on Pin 8 - an open-drain output pulled low when either output falls below –8.5% of regulation and released after ~117ms of stable operation. This signal is commonly used for microcontroller reset sequencing and can serve as a functional equivalent to PGOOD in many portable designs.
LTC3548IMSE#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
LTC3548IMSE#TRPBF FAQ
1.How can I place an order for LTC3548IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548IMSE#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 LTC3548IMSE#TRPBF reliable?
The price and inventory of LTC3548IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3548IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3548IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548IMSE#TRPBF?
LTC3548IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548IMSE#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 LTC3548IMSE#TRPBF?
For technical support, including LTC3548IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3548IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3548IMSE#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 LTC3548IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3548IMSE#TRPBF?
All LTC3548IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548IMSE#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 LTC3548IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3548IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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