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Analog Devices Inc. LTC3548IMSE#PBF
- Part No.:
- LTC3548IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3548IMSE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:204
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Product details
Overview
LTC3548IMSE#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, integrated 0.35Ω P-channel and 0.30Ω N-channel MOSFETs, and supports adjustable output voltages from 0.6V to 5V per channel - used in digital cameras and cellular phones for efficient dual-rail power conversion.
For engineers reviewing the LTC3548IMSE#PBF datasheet, LTC3548IMSE#PBF pinout, LTC3548IMSE#PBF application, or LTC3548IMSE#PBF 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, and thermal performance in the 10-lead MSOP package with exposed PGND pad.
Technical Context
The LTC3548IMSE#PBF employs a constant-frequency current-mode control architecture with shared 2.25MHz oscillator across both channels, enabling precise timing alignment and reduced EMI. Each channel uses internal P-channel high-side and N-channel low-side synchronous switches, eliminating external Schottky diodes and supporting 100% duty-cycle dropout operation.
Its dual-loop design includes independent feedback paths (VFB1/VFB2 referenced to 0.6V), programmable mode selection (Burst Mode® for ≤40μA quiescent current or pulse-skipping for low-noise light-load operation), and an open-drain POR output triggered by –8.5% output undervoltage with 117ms delay after regulation recovery.
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 (typ) - enables use of sub-3mm height inductors and compact 10μF ceramic output capacitors. |
| 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%) - sets output voltage via external resistor divider; enables 0.6V–5V adjustment range per channel. |
| Quiescent Current | 40μA (typ) - total supply current in active mode with both channels enabled and no load. |
| Shutdown Current | <1μA - minimizes battery drain during system sleep states. |
| Power-On Reset Threshold | –8.5% of VOUT - asserts POR low when either output falls below regulation; 117ms timeout after recovery. |
Pinout & Package
Package: 10-lead plastic MSOP with exposed power ground (PGND) pad (Pin 11), 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; requires <5μA bias current. |
| 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 PGND. |
| 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 tie to PCB ground plane for noise immunity and stability. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | VIN = Burst Mode®; GND = pulse-skipping; external clock = forced pulse-skipping + synchronization. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1; independent inductor connection required. |
| POR (Pin 8) | Power-On Reset output | Open-drain; pulled low if either VOUT drops >8.5% below target; releases after 117ms in regulation. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable/disable; identical logic to RUN1; supports staggered power sequencing. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same electrical specs as VFB1; enables independent output voltage programming. |
| Exposed Pad (Pin 11) | Power Ground (PGND) | Mandatory solder connection to PCB ground plane; critical for thermal dissipation (θJA = 45°C/W) and EMI reduction. |
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 quiescent current to 40μA while maintaining regulation; ideal for battery-powered standby states. |
| 100% duty-cycle dropout | Enables VOUT ≈ VIN – ILOAD × RDS(ON); sustains output during brownout without external circuitry. |
| Externally synchronizable oscillator | Accepts 2.25MHz external clock on MODE/SYNC pin; eliminates beat frequencies in multi-regulator systems. |
| Power-On Reset with timeout | Provides system-level reset signal synchronized to power rail stability; avoids premature MCU boot before VDD is valid. |
Applications
| Digital Camera Core & I/O Rails | Cellular Phone Baseband & RF Supply |
|---|---|
Use Scenario: Powers image sensor core (1.2V), ISP (1.8V), and SDIO interface (2.8V) from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-output synchronous buck regulator delivering tightly regulated, low-noise supplies with independent enable sequencing. Use Value: Enables simultaneous activation of sensor and processor subsystems while minimizing board area via 2.25MHz switching and 3mm × 3mm DFN/MSOP footprint. | Use Scenario: Supplies baseband processor (1.3V) and PA bias rail (3.3V) in GSM/UMTS handsets with dynamic load profiles. IC Role / Device Role / Timing Role: Dual-channel DC/DC converter with Burst Mode® for ultra-low IQ during idle and pulse-skipping for clean RF supply during transmission bursts. Use Value: Extends talk time by 12–18% versus discrete solutions due to 40μA quiescent current and synchronous rectification efficiency. |
| Portable Media Player Audio & DSP | Wireless Modem Dual-VDD System |
Use Scenario: Generates 1.2V for audio codec DSP and 3.3V for NAND flash interface in MP3 players. IC Role / Device Role / Timing Role: Dual-output regulator with independent RUN pins enabling staggered power-up to avoid inrush current peaks. Use Value: Prevents brownout on shared battery rail during simultaneous codec initialization and flash access via controlled sequencing. | Use Scenario: Powers WLAN MAC (1.8V) and RF transceiver (2.5V) in 802.11b/g modules with strict EMI limits. IC Role / Device Role / Timing Role: High-frequency (2.25MHz) synchronous buck with MODE/SYNC pin enabling external clock synchronization to avoid band interference. Use Value: Reduces conducted EMI by 8–10dB through deterministic switching edge alignment with host system clock. |
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 | Fixed 1.2V/1.8V outputs; 2.25MHz switching; 600mA/600mA rating; no POR output. | Lacks programmable VOUT and Power-On Reset - unsuitable where flexible rail generation or system reset coordination is required. | Select when fixed dual-rail outputs suffice and board space is constrained (2mm × 2mm WSON). |
| RT8059NGQW | Adjustable dual outputs; 1.5MHz switching; 600mA/600mA; integrated soft-start; no MODE/SYNC pin. | Missing Burst Mode® and external synchronization - less optimal for ultra-low-IQ battery standby or EMI-sensitive RF designs. | Prefer for cost-sensitive industrial IoT nodes where 1.5MHz operation meets size/EMI targets and IQ <100μA is acceptable. |
Compared with TPS62400DRVR and RT8059NGQW, the LTC3548IMSE#PBF provides unique flexibility in output voltage programming, true dual-channel independence (separate RUN/POR), and selectable light-load modes - making it optimal for portable consumer electronics demanding both efficiency and design adaptability.
Availability
LTC3548IMSE#PBF is available at Aetrix Electronics and suitable for digital cameras, cellular phones, and portable media players requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LTC3548IMSE#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 acquired Linear Technology in 2017 and maintains its precision analog and power management product lines with full datasheet, simulation model, and application support.
The LTC3548IMSE#PBF belongs to Linear's high-frequency synchronous buck regulator family, engineered specifically for space-constrained, battery-powered portable devices needing dual independent power rails with minimal quiescent current.
FAQ
What is the maximum output current per channel for the LTC3548IMSE#PBF?
The LTC3548IMSE#PBF supports up to 400mA on Channel 1 and 800mA on Channel 2, determined by internal peak current limits of 0.7A and 1.2A respectively. These values assume proper thermal management using the exposed PGND pad and recommended PCB copper area per Linear's layout guidelines. Derating applies above 60°C ambient.
Does the LTC3548IMSE#PBF require external Schottky diodes?
No, the LTC3548IMSE#PBF does not require external Schottky diodes. It integrates synchronous P-channel high-side and N-channel low-side MOSFETs with typical RDS(ON) of 0.35Ω and 0.30Ω, enabling high-efficiency operation without external rectification components.
How does the MODE/SYNC pin affect LTC3548IMSE#PBF operation?
The MODE/SYNC pin on the LTC3548IMSE#PBF selects between Burst Mode® (tie to VIN) for ultra-low IQ or pulse-skipping mode (tie to GND) for low-noise light-load operation. When driven by an external 2.25MHz clock, it forces pulse-skipping mode and synchronizes switching edges - critical for EMI control in dense PCB layouts.
What is the purpose of the POR pin on the LTC3548IMSE#PBF?
The POR (Power-On Reset) pin on the LTC3548IMSE#PBF is an open-drain output that pulls low when either output voltage falls more than 8.5% below its regulated value. After both channels recover, it releases after ~117ms (262,144 clock cycles), providing a reliable system reset signal coordinated with power rail stability.
Can the LTC3548IMSE#PBF operate with input voltage below 2.5V?
No, the LTC3548IMSE#PBF has a specified minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this threshold risks undervoltage lockout activation or unstable regulation; the device shuts down when VIN drops below ~1.65V.
LTC3548IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LTC3548IMSE#PBF FAQ
1.How can I place an order for LTC3548IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548IMSE#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 LTC3548IMSE#PBF reliable?
The price and inventory of LTC3548IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3548IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3548IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548IMSE#PBF?
LTC3548IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548IMSE#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 LTC3548IMSE#PBF?
For technical support, including LTC3548IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548IMSE#PBF requirements.
6.How does Aetrix verify that LTC3548IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3548IMSE#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 LTC3548IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3548IMSE#PBF?
All LTC3548IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548IMSE#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 LTC3548IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3548IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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