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Analog Devices Inc. LTC3548AIMSE#TRPBF
- Part No.:
- LTC3548AIMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3548AIMSE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,992
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Product details
Overview
LTC3548AIMSE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down DC/DC regulator IC designed for space-constrained, battery-powered systems. It delivers 400mA on Channel 2 and 800mA on Channel 1 across a 2.5V–5.5V input range, operates at a fixed 2.25MHz switching frequency, and supports adjustable output voltages from 0.6V to 5V - enabling compact designs in PDAs, digital cameras, and cellular handsets.
For engineers reviewing the LTC3548AIMSE#TRPBF datasheet, LTC3548AIMSE#TRPBF pinout, LTC3548AIMSE#TRPBF application, or LTC3548AIMSE#TRPBF equivalent, key selection criteria include its dual-output current capability (400mA/800mA), 2.25MHz constant-frequency operation, Burst Mode® vs pulse-skipping mode selection via MODE/SYNC, 40μA quiescent current in active mode, and MSOP-10 package with exposed thermal pad.
Technical Context
The LTC3548AIMSE#TRPBF uses a current-mode control architecture with shared 2.25MHz oscillator and in-phase dual-channel operation. Each channel integrates P-channel high-side (0.35Ω RDS(ON)) and N-channel synchronous rectifier switches, eliminating external Schottky diodes while supporting 100% duty-cycle dropout operation.
Its MODE/SYNC pin enables user-selectable low-noise pulse-skipping mode or high-efficiency Burst Mode® operation; POR provides open-drain power-on reset with ±8.5% regulation window and 65,536-cycle delay (~29ms). Feedback reference is tightly regulated at 0.6V over –40°C to 125°C.
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 rail inputs without pre-regulation. |
| Switching Frequency | 2.25MHz (typical) - enables use of sub-1mm-height inductors and 10μF ceramic capacitors for ultra-compact layouts. |
| Output Current Capability | Channel 1: 800mA; Channel 2: 400mA - defined by internal switch current limits (1.2A/0.7A peak) and thermal design margin. |
| Feedback Reference Voltage | 0.6V ±1.2% (–40°C to 125°C) - sets output voltage via external resistor divider; enables precise 0.6V–5V adjustment. |
| Quiescent Current | 40μA (both channels active, Burst Mode®) - extends battery runtime in always-on, low-duty-cycle applications. |
| Shutdown Current | <1μA - ensures negligible drain during system sleep or storage. |
| Operating Junction Temp | –40°C to 125°C - qualified for industrial and automotive cabin-temperature environments. |
Pinout & Package
Package: 10-Lead Plastic MSOP with exposed thermal pad (Pin 11 = PGND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistor divider; regulates VOUT1 to 0.6V reference - determines output voltage accuracy and loop stability. |
| RUN/SS1 (Pin 2) | Channel 1 enable & soft-start | High = enable; low = shutdown; RC network here controls startup slew rate and inrush current limiting. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling close to pin to suppress high-frequency noise. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND - critical for EMI layout; must minimize trace length and loop area. |
| NC (Pin 5) | No connect | Internally unconnected; recommended to tie to GND on PCB for shielding and thermal conduction. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tie to VIN for Burst Mode® (high efficiency); tie to GND for pulse-skipping (low ripple); accepts external 2.25MHz clock for synchronization. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1 but for second regulator - requires separate inductor and layout isolation to prevent crosstalk. |
| POR (Pin 8) | Power-on reset output | Open-drain signal pulled low if either output is outside ±8.5% regulation; delays ~29ms after stable regulation. |
| RUN/SS2 (Pin 9) | Channel 2 enable & soft-start | Independent control of Channel 2; allows staggered startup or selective shutdown for power sequencing. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same function as VFB1 but for VOUT2 - enables independent voltage setting and regulation per channel. |
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. |
| Burst Mode® operation | Reduces quiescent current to 40μA while maintaining regulation - ideal for standby power in portable devices. |
| 100% duty-cycle dropout | Enables VOUT ≈ VIN − ILOAD × RDS(ON) during brownout - preserves functionality down to input voltages near output levels. |
| Externally synchronizable oscillator | Accepts 2.25MHz external clock on MODE/SYNC pin to eliminate beat frequencies in multi-regulator systems. |
| Power-on reset with timer | Provides system-level reset assertion until both outputs stabilize within ±8.5%, then holds for 65,536 cycles. |
Applications
| Mobile Handset Power Management | Digital Camera Core Logic Supply |
|---|---|
Use Scenario: Dual-rail power for baseband processor (1.8V @ 800mA) and RF transceiver (2.5V @ 400mA) in GSM/WCDMA handset. IC Role / Device Role / Timing Role: Primary dual-output DC/DC regulator providing tightly regulated, low-noise supplies with independent enable control. Use Value: 2.25MHz switching avoids AM radio band interference; Burst Mode® extends talk time by minimizing idle current draw. |
Use Scenario: Powering image sensor interface (1.8V) and ISP core (2.5V) in compact digital camera with fast wake-up requirement. IC Role / Device Role / Timing Role: Dual synchronous buck delivering fast transient response and low output ripple for noise-sensitive analog pixel circuits. Use Value: Pulse-skipping mode (selected via MODE/SYNC = GND) reduces VOUT ripple to <35mVP-P, preventing image artifacts during capture. |
| Wireless Modem Baseband SoC | PDA Application Processor Rail |
Use Scenario: Supplying 1.2V core and 3.3V I/O rails for LTE modem SoC in portable hotspot device with thermal constraints. IC Role / Device Role / Timing Role: Dual-channel regulator with independent soft-start (RUN/SS1/RUN/SS2) enabling controlled power sequencing to meet SoC boot requirements. Use Value: MSOP-10 package with exposed pad supports 125°C junction temperature - sustains full load under sealed enclosure conditions. |
Use Scenario: Generating 1.8V (VDDIO) and 1.2V (VDDCORE) for ARM-based PDA processor with dynamic voltage scaling. IC Role / Device Role / Timing Role: Adjustable dual-output regulator supporting multiple operating points via external resistor networks on VFB1/VFB2. Use Value: 0.6V feedback reference enables accurate low-voltage outputs; POR output coordinates system reset with power rail stabilization. |
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 fixed frequency; 600mA/600mA dual outputs; 0.6V ref; no POR; smaller 2mm × 2mm WSON package. | Lacks power-on reset and independent RUN/SS pins - requires external reset IC and sequencing logic. | Choose when board space is critical and POR is handled elsewhere; verify thermal performance at 800mA load. |
| MAX17504ATP+ | Adjustable 200kHz–2.2MHz frequency; 1A/1A dual outputs; 0.6V ref; includes PMBus interface and telemetry. | Higher integration with digital control adds complexity; larger 20-pin TQFN package; higher BOM cost. | Prefer when programmable frequency, voltage margining, or fault logging are required - not for cost- or size-sensitive designs. |
Compared with TPS62400DRVR and MAX17504ATP+, the LTC3548AIMSE#TRPBF uniquely combines integrated POR, independent soft-start pins, and guaranteed 800mA/400mA output capability in a thermally enhanced MSOP-10 - making it optimal for industrial handhelds requiring robust power sequencing and long battery life without added components.
Availability
LTC3548AIMSE#TRPBF is available at Aetrix Electronics and suitable for mobile handset power management, digital camera core logic supply, wireless modem baseband SoC applications requiring stable component supply, consistent parametric performance, and long-term industrial-grade availability.
Supply support for LTC3548AIMSE#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 technical documentation and long-term support.
The LTC3548A belongs to Linear's high-frequency synchronous buck regulator family, engineered specifically for portable and battery-operated equipment where small solution size, high light-load efficiency, and reliable power sequencing are essential.
FAQ
What is the maximum output current supported by each channel of the LTC3548AIMSE#TRPBF?
The LTC3548AIMSE#TRPBF supports up to 800mA on Channel 1 (VOUT1) and 400mA on Channel 2 (VOUT2) under typical thermal conditions with proper PCB layout. These values derive from its internal switch current limits (1.2A peak for CH1, 0.7A peak for CH2) and thermal resistance (θJA = 45°C/W). Sustained 800mA operation requires adequate copper area on the exposed pad and ambient temperature ≤85°C.
How does the MODE/SYNC pin affect the operation of the LTC3548AIMSE#TRPBF?
The MODE/SYNC pin on the LTC3548AIMSE#TRPBF selects between two low-load operating modes: tying it to VIN enables Burst Mode® (minimizing quiescent current to 40μA), while tying it to GND selects pulse-skipping mode (reducing output ripple to <35mVP-P). It also accepts an external 2.25MHz clock for synchronization - automatically forcing pulse-skipping mode during sync.
Can the LTC3548AIMSE#TRPBF operate with input voltage below 2.5V?
No - the LTC3548AIMSE#TRPBF has a specified minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V risks undervoltage lockout activation (UVLO trips at ~1.65V) and undefined regulation behavior. For sub-2.5V inputs, consider the LTC3549 or other dedicated low-VIN regulators.
What is the purpose of the exposed pad (Pin 11) on the LTC3548AIMSE#TRPBF MSOP package?
The exposed pad (Pin 11) on the LTC3548AIMSE#TRPBF is designated PGND and must be soldered to a solid PCB ground plane. It serves dual functions: lowering thermal resistance (θJC = 10°C/W) to sustain high output currents, and providing a low-inductance return path for high-frequency switch currents - critical for EMI control and regulation stability.
Does the LTC3548AIMSE#TRPBF support independent voltage setting for each output?
Yes - the LTC3548AIMSE#TRPBF supports fully independent voltage programming via separate feedback dividers on VFB1 and VFB2. Each pin references the same 0.6V internal bandgap, allowing outputs to be set anywhere from 0.6V to 5V using the formula VOUT = 0.6V × (1 + R2/R1). No coupling or shared components are required between channels.
LTC3548AIMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3548AIMSE#TRPBF FAQ
1.How can I place an order for LTC3548AIMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548AIMSE#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 LTC3548AIMSE#TRPBF reliable?
The price and inventory of LTC3548AIMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3548AIMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3548AIMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548AIMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548AIMSE#TRPBF?
LTC3548AIMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548AIMSE#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 LTC3548AIMSE#TRPBF?
For technical support, including LTC3548AIMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548AIMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3548AIMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3548AIMSE#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 LTC3548AIMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3548AIMSE#TRPBF?
All LTC3548AIMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548AIMSE#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 LTC3548AIMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3548AIMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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