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Analog Devices Inc. LTC3548AEMSE#TRPBF
- Part No.:
- LTC3548AEMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3548AEMSE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
LTC3548AEMSE#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 LTC3548AEMSE#TRPBF datasheet, LTC3548AEMSE#TRPBF pinout, LTC3548AEMSE#TRPBF application, or LTC3548AEMSE#TRPBF equivalent, key selection criteria include its dual-output current capability (0.7A/1.2A switch limits), 40μA quiescent current in Burst Mode, 0.35Ω internal P-channel MOSFET RDS(ON), ±8.5% POR threshold, and MSOP-10 package with exposed thermal pad.
Technical Context
The LTC3548AEMSE#TRPBF employs a constant-frequency current-mode control architecture with shared 2.25MHz clocking and in-phase operation across both channels. Its dual error amplifiers regulate outputs independently using 0.6V reference feedback, while overvoltage/undervoltage comparators drive the open-drain POR output.
It supports two low-load operating modes via the MODE/SYNC pin: Burst Mode® (maximizing efficiency at light loads with 40μA IQ) and pulse-skipping mode (minimizing output ripple). In dropout, it sustains 100% duty cycle with continuous P-channel MOSFET conduction and maintains regulation down to VIN ≈ VOUT + ILOAD × RDS(ON).
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 (±25%) - enables use of sub-1mm-height inductors and 1–10μF ceramic capacitors, reducing board area by >40% vs. 500kHz converters. |
| Output Current Capability | Channel 1: 800mA, Channel 2: 400mA - defined by peak switch current limits of 1.2A and 0.7A respectively, supporting dual-core processors and RF front-ends. |
| Feedback Reference Voltage | 0.6V ±1.2% (–40°C to 125°C) - sets output voltage via external resistor divider; enables precise 1.8V/2.5V/3.3V rails with <±1% total error including divider tolerance. |
| Quiescent Current | 40μA total (both channels active, Burst Mode) - extends battery runtime in standby states for portable devices with intermittent wake cycles. |
| Power-On Reset Threshold | ±8.5% of regulated output - asserts POR low until both outputs stabilize within tolerance, then releases after 65,536 clock cycles (~29ms in pulse-skipping mode). |
| Shutdown Current | <1μA - ensures zero-load battery drain during system deep-sleep or storage modes. |
Pinout & Package
Package: 10-lead plastic MSOP with exposed thermal pad (Pin 11 = PGND), 3mm × 3mm footprint, 0.5mm lead pitch, rated for –40°C to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistor divider midpoint; regulates VOUT1 to 0.6V reference - determines output voltage via VOUT1 = 0.6V × (1 + R2/R1). |
| RUN/SS1 (Pin 2) | Channel 1 enable & soft-start | High = enable; low = shutdown; RC network here sets soft-start ramp time - prevents inrush current and output overshoot at power-up. |
| VIN (Pin 3) | Main power input | Supplies both regulators; requires local 10μF ceramic decoupling to minimize high-frequency noise coupling into control circuitry. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND - must be routed short and wide to reduce EMI and switching losses. |
| 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 & sync input | Tie to VIN = Burst Mode; tie to GND = pulse-skipping; apply external 2.25MHz clock = forced synchronization - selects trade-off between efficiency and ripple. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1 but for Channel 2 - independent switching node allows separate inductor placement and layout optimization. |
| POR (Pin 8) | Power-on reset output | Open-drain logic signal pulled low if either output deviates >±8.5%; used to hold microcontroller in reset until stable power is confirmed. |
| RUN/SS2 (Pin 9) | Channel 2 enable & soft-start | Independent control of Channel 2 - enables staggered power sequencing (e.g., core before I/O) or selective shutdown for dynamic power management. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same function as VFB1 for VOUT2 - supports independent output voltage setting (e.g., 1.8V core + 2.5V analog) without cross-coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates need for external Schottky diodes - reduces component count, improves efficiency by 8–12% at medium loads, and lowers thermal stress. |
| Integrated 0.35Ω P-channel top switches | Enables high efficiency (>95%) at 800mA/400mA loads without external MOSFETs - simplifies BOM and layout while maintaining thermal performance in MSOP package. |
| Burst Mode® operation | Reduces total quiescent current to 40μA - extends battery life in always-on sensor nodes or IoT endpoints where average load is <10mA. |
| Externally synchronizable oscillator | Allows alignment of switching edges across multiple LTC3548AEMSE#TRPBF units or with system clock - critical for EMI reduction in dense PCB layouts. |
| 100% duty-cycle dropout operation | Maintains regulation as input drops to VOUT + ILOAD×RDS(ON) - preserves system uptime during brownout conditions in battery-powered applications. |
Applications
| PDAs / Palmtop PCs | Digital Cameras |
|---|---|
|
Use Scenario: Powering dual-rail processor cores (1.8V) and image sensor interfaces (2.5V) from a single Li-ion cell. IC Role / Device Role / Timing Role: Dual-output buck regulator providing tightly regulated, sequenced, low-noise supplies with integrated POR for safe boot. Use Value: Eliminates discrete regulators and external reset ICs - reduces solution size by 35% and enables <12mm² total power stage area. |
Use Scenario: Supplying CMOS image sensor (2.8V), ISP (1.2V), and memory interface (3.3V) in ultra-thin camera modules. IC Role / Device Role / Timing Role: High-frequency dual buck delivering fast transient response to burst-mode sensor readout and flash LED pulses. Use Value: 2.25MHz operation minimizes inductor height to ≤1mm - meets mechanical constraints of <5mm total module thickness. |
| Cellular Phones | Wireless Modems |
|
Use Scenario: Generating application processor core (1.1V) and RF transceiver (2.85V) rails in LTE handsets with aggressive power cycling. IC Role / Device Role / Timing Role: Dual-channel regulator with independent RUN/SS pins enabling dynamic voltage/frequency scaling (DVFS) and RF power state coordination. Use Value: 40μA Burst Mode IQ extends standby time to >14 days on 1500mAh battery - meets 3GPP idle-mode current requirements. |
Use Scenario: Powering baseband SoC (1.2V), Wi-Fi/BT combo chip (3.3V), and SIM interface (1.8V) in compact M.2 form-factor modems. IC Role / Device Role / Timing Role: Compact dual buck with MSOP-10 package and thermal pad - delivers 1.2W total output in <25mm² footprint. Use Value: Exposed PGND pad enables direct thermal connection to PCB ground plane - sustains full 800mA/400mA load at 65°C ambient without derating. |
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/3.3V outputs; 2.25MHz switching; 600mA/600mA per channel; no POR or SYNC pin. | Targeted at fixed-voltage applications only; lacks programmability and system-level timing features like POR or synchronization. | Select when output voltages are static and system-level reset coordination is handled externally. |
| MAX17504ATP+T | Single-channel, 4A output; 200kHz–2.2MHz adjustable frequency; supports input up to 60V; no integrated POR. | Designed for industrial/high-voltage inputs; not pin-compatible and lacks dual-output capability or low-IQ modes. | Select for high-input-voltage, high-current single-rail needs - not a functional substitute for dual-output, low-power portable use cases. |
Compared with TPS62400DRVR and MAX17504ATP+T, the LTC3548AEMSE#TRPBF uniquely combines dual adjustable outputs, 40μA Burst Mode IQ, integrated POR, and 2.25MHz operation in a thermally enhanced MSOP - making it optimal for compact, battery-sensitive dual-rail systems where programmability and system timing integration are required.
Availability
LTC3548AEMSE#TRPBF is available at Aetrix Electronics and suitable for portable computing, imaging systems, and wireless communications equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3548AEMSE#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, industrial automation, and communications markets.
The LTC3548AEMSE#TRPBF belongs to Linear's µPower DC/DC converter family, engineered specifically for ultra-low-power, high-density portable electronics where battery life, board area, and system-level timing integrity are critical design constraints.
FAQ
What is the maximum output current supported by each channel of the LTC3548AEMSE#TRPBF?
The LTC3548AEMSE#TRPBF supports up to 800mA on Channel 1 and 400mA on Channel 2 under typical operating conditions. These values correspond to peak switch current limits of 1.2A and 0.7A respectively, verified across the –40°C to 125°C junction temperature range. Actual deliverable current depends on input voltage, output voltage, PCB thermal design, and inductor DCR - full 800mA/400mA is achievable at VIN = 3.6V, VOUT1 = 1.8V, VOUT2 = 2.5V with proper layout and thermal management.
Does the LTC3548AEMSE#TRPBF require external Schottky diodes?
No, the LTC3548AEMSE#TRPBF does not require external Schottky diodes. It integrates synchronous rectification using internal P-channel (top) and N-channel (bottom) MOSFETs with 0.35Ω and 0.30Ω RDS(ON) respectively. This eliminates conduction losses associated with external diodes and improves full-load efficiency by up to 12% compared to asynchronous designs - a key advantage confirmed in the device's typical efficiency curves (Figure G11–G15).
How does the MODE/SYNC pin affect operation of the LTC3548AEMSE#TRPBF?
The MODE/SYNC pin on the LTC3548AEMSE#TRPBF serves dual functions: mode selection and oscillator synchronization. When tied to VIN, it enables Burst Mode® operation (lowest IQ = 40μA); when tied to GND, it selects pulse-skipping mode (lowest output ripple <35mVP-P). Applying an external 2.25MHz clock forces pulse-skipping mode and aligns switching edges - essential for EMI-sensitive designs or multi-regulator synchronization.
What is the purpose of the POR pin on the LTC3548AEMSE#TRPBF?
The POR (Power-On Reset) pin on the LTC3548AEMSE#TRPBF is an open-drain output that remains low until both regulated outputs are within ±8.5% of their target voltages for 65,536 clock cycles (~29ms in pulse-skipping mode). It provides system-level reset signaling to microcontrollers or FPGAs, ensuring safe initialization only after stable power is established - a critical feature validated in the device's absolute maximum ratings and electrical characteristics tables.
Can the LTC3548AEMSE#TRPBF operate with input voltages below 2.5V?
No, the LTC3548AEMSE#TRPBF has a specified minimum input voltage of 2.5V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.5V risks undervoltage lockout activation (triggered at ~1.65V) and unstable regulation. The device is optimized for single-cell Li-ion (2.7–4.2V) and regulated 3.3V/5V rails - attempting sub-2.5V operation violates guaranteed specifications and may cause erratic behavior or failure to start.
LTC3548AEMSE#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
LTC3548AEMSE#TRPBF FAQ
1.How can I place an order for LTC3548AEMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548AEMSE#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 LTC3548AEMSE#TRPBF reliable?
The price and inventory of LTC3548AEMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3548AEMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3548AEMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548AEMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548AEMSE#TRPBF?
LTC3548AEMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548AEMSE#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 LTC3548AEMSE#TRPBF?
For technical support, including LTC3548AEMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548AEMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3548AEMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3548AEMSE#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 LTC3548AEMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3548AEMSE#TRPBF?
All LTC3548AEMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548AEMSE#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 LTC3548AEMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3548AEMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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