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Analog Devices Inc. LTC3548EMSE#PBF
- Part No.:
- LTC3548EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3548EMSE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:874
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Product details
Overview
LTC3548EMSE#PBF from Analog Devices (formerly Linear Technology) is a dual-channel synchronous step-down DC/DC regulator designed for low-power portable systems. It delivers 400mA and 800mA per channel, operates from 2.5V to 5.5V input, maintains constant 2.25MHz switching frequency, and supports adjustable output voltages from 0.6V to 5V - enabling compact power solutions in space-constrained PDA, digital camera, and cellular phone designs.
For engineers reviewing the LTC3548EMSE#PBF datasheet, LTC3548EMSE#PBF pinout, LTC3548EMSE#PBF application, or LTC3548EMSE#PBF equivalent, key selection criteria include verified 0.35Ω internal P-channel MOSFET RDS(ON), confirmed 40μA quiescent current in active mode, validated Burst Mode® operation with <1μA shutdown current, and documented 10-lead MSOP package thermal performance (θJA = 45°C/W).
Technical Context
The LTC3548EMSE#PBF employs a constant-frequency current-mode control architecture with shared 2.25MHz oscillator across both channels, enabling precise in-phase switching and stable transient response. Its dual independent error amplifiers compare VFB1/VFB2 against a 0.6V reference to regulate each output, while integrated anti-shoot-through logic prevents cross-conduction in the synchronous P/N-MOSFET power stages.
Operation includes user-selectable Burst Mode® (low-noise pulse-skipping disabled) and pulse-skipping mode via MODE/SYNC pin, with automatic transition at light loads. The device supports 100% duty-cycle dropout, delivers Power-On Reset (POR) with –8.5% undervoltage detection and 117ms delay, and features internal 0.35Ω top switch and 0.30Ω bottom switch with guaranteed on-resistance over temperature.
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 external LDO pre-regulation. |
| Switching Frequency | 2.25MHz (typical) - enables use of sub-3mm-height inductors (e.g., 2.2μH) and ≤10μF ceramic output capacitors. |
| Output Current Capability | Channel 1: 800mA; Channel 2: 400mA - defined by peak switch current limits of 1.2A and 0.7A respectively. |
| Feedback Reference Voltage | 0.6V (±2% over –40°C to 85°C) - sets output voltage via external resistor divider; enables 0.6V–5V programmability with <0.5% line regulation. |
| Quiescent Current | 40μA (typical, both channels active) - extends battery runtime in always-on subsystems such as real-time clocks or sensor interfaces. |
| Shutdown Current | <1μA - meets ultra-low-power requirements for standby modes in portable media players and wireless modems. |
| Thermal Resistance | θJA = 45°C/W (MSOP package) - requires minimal PCB copper area for thermal management in handheld enclosures. |
Pinout & Package
10-lead plastic MSOP package (LTC3548EMSE#PBF) with exposed pad (Pin 11) connected to PGND; requires soldering to 4-layer PCB ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider output; regulates VOUT1 to 0.6V × (1 + R2/R1); input bias current ≤30nA minimizes divider power loss. |
| RUN1 (Pin 2) | Channel 1 enable control | Logic-high (≥1.5V) enables regulator; logic-low (≤0.3V) forces shutdown; must not be left floating. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling; absolute max = 6V. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; high dv/dt node requiring short, low-inductance layout. |
| GND (Pin 5) | Analog ground reference | Not internally connected; must tie to PCB ground plane near VIN and SW pins for noise immunity. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tie to VIN for Burst Mode®; tie to GND for pulse-skipping; apply external 2.25MHz clock for synchronization. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1; independent inductor connection required. |
| POR (Pin 8) | Power-On Reset open-drain output | Pulls low if either VOUT drops >8.5% below regulation; releases after 262,144 cycles (~117ms) when both outputs are stable. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable/disable control identical to RUN1; allows staggered power-up sequencing. |
| VFB2 (Pin 10) | Channel 2 feedback input | Functionally identical to VFB1; supports independent output voltage programming. |
Key Features
| Feature | Design Value |
|---|---|
| No external Schottky diodes required | Integrated synchronous rectification with 0.35Ω P-MOSFET and 0.30Ω N-MOSFET reduces conduction losses and board area. |
| Burst Mode® operation | Delivers up to 95% efficiency at 1mA load by gating full switching cycles - critical for battery life in standby states. |
| Low-output-ripple pulse-skipping mode | Maintains 2.25MHz switching down to light loads, minimizing EMI-sensitive applications like RF front-ends and audio codecs. |
| 100% duty-cycle dropout | Enables VOUT ≈ VIN – ILOAD×RDS(ON) during brownout; preserves functionality as input voltage sags toward output level. |
| Power-On Reset with programmable delay | Open-drain POR asserts reset until both outputs stabilize within ±8.5%, then holds for fixed 117ms - ensures reliable microcontroller boot. |
Applications
| PDAs / Palmtop PCs | Digital Cameras |
|---|---|
Use Scenario: Dual-rail power for ARM-based application processor (1.8V core) and image sensor interface (2.5V I/O). IC Role / Device Role / Timing Role: Primary dual-output buck regulator supplying core and I/O domains with independent enable control and synchronized switching. Use Value: 2.25MHz operation allows 2.2μH inductors and 10μF ceramic caps, reducing solution height to ≤1mm - essential for thin clamshell form factors. |
Use Scenario: Powering CMOS image sensor (1.2V analog), ISP (1.5V core), and SD card interface (2.8V) from single Li-ion cell. IC Role / Device Role / Timing Role: Dual synchronous buck delivering tightly regulated, low-noise supplies with independent POR monitoring per rail. Use Value: Burst Mode® extends battery life during preview mode (light load), while pulse-skipping mode ensures clean power during video capture (low ripple). |
| Cellular Phones | Wireless Modems |
Use Scenario: Supplying baseband processor (1.2V), RF transceiver (2.8V), and memory (3.3V) in multi-band GSM/UMTS handsets. IC Role / Device Role / Timing Role: Dual buck converter with independent RUN pins enabling dynamic power gating of subsystems during sleep cycles. Use Value: 40μA quiescent current and <1μA shutdown minimize leakage during deep-sleep states - directly extending talk time and standby duration. |
Use Scenario: Powering LTE modem SoC (1.1V core), RF front-end (3.3V), and USB PHY (3.3V) in compact M.2 modules. IC Role / Device Role / Timing Role: Dual-step-down regulator supporting fast load transients from burst data transmission and maintaining POR integrity during voltage dips. Use Value: Current-mode control delivers <10μs recovery from 800mA load steps, preventing brownout resets during TCP/IP packet bursts. |
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 |
|---|---|---|---|
| TPS62125DSCR | Single-output, 3MHz fixed-frequency, 300mA max; no POR or MODE pin; smaller 6-pin WSON package. | Lacks dual-channel capability and power-good signaling - unsuitable for systems requiring independent rail control or reset coordination. | Select only for cost-sensitive single-rail applications where size is paramount and POR is handled externally. |
| MAX17504ATP+T | Dual-output, 400kHz–2.2MHz adjustable frequency, 1A/1A rating; requires external MOSFETs; no integrated POR. | Higher current but larger solution size due to external FETs and need for external reset IC; lacks Burst Mode® efficiency optimization. | Prefer for industrial applications needing higher current or wider input range (4.5V–60V), not portable battery-powered devices. |
Compared with LTC3548EMSE#PBF, TPS62125DSCR offers lower BOM count for single-rail use but cannot replace dual-rail functionality, while MAX17504ATP+T provides higher current headroom at the expense of efficiency, size, and integrated features - making LTC3548EMSE#PBF optimal for compact, battery-sensitive dual-rail designs.
Availability
LTC3548EMSE#PBF is available at Aetrix Electronics and suitable for PDA power management, digital camera subsystems, and cellular handset applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3548EMSE#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 legacy precision analog and power management product lines with full datasheet, simulation model, and application support.
The LTC3548 belongs to Linear's high-frequency synchronous buck regulator family, engineered specifically for space-constrained portable electronics demanding ultra-low quiescent current, integrated power sequencing, and minimal external component count.
FAQ
What is the maximum output current per channel for the LTC3548EMSE#PBF?
The LTC3548EMSE#PBF supports 800mA on Channel 1 and 400mA on Channel 2, defined by internal peak switch current limits of 1.2A and 0.7A respectively. These values are validated across the –40°C to 85°C operating temperature range and assume proper thermal design using the MSOP package's exposed pad.
Does the LTC3548EMSE#PBF require external Schottky diodes?
No, the LTC3548EMSE#PBF does not require external Schottky diodes. It integrates synchronous rectification with internal 0.35Ω P-channel and 0.30Ω N-channel MOSFETs per channel, eliminating reverse recovery losses and reducing total solution size and cost compared to asynchronous buck designs.
How does Burst Mode® operation improve efficiency in the LTC3548EMSE#PBF?
Burst Mode® operation in the LTC3548EMSE#PBF improves light-load efficiency by disabling full switching cycles when output demand is low, reducing gate charge losses. At 1mA load, this enables up to 95% efficiency - significantly higher than continuous PWM mode - while maintaining regulation via periodic burst pulses.
What is the function of the POR pin on the LTC3548EMSE#PBF?
The POR (Power-On Reset) pin on the LTC3548EMSE#PBF is an open-drain output that pulls low when either regulated output falls more than 8.5% below its target voltage. After both outputs stabilize, it releases after a fixed 117ms delay (262,144 clock cycles), providing a reliable reset signal for microcontrollers or FPGAs powered by LTC3548EMSE#PBF rails.
Can the LTC3548EMSE#PBF operate with input voltage below 2.5V?
No, the LTC3548EMSE#PBF has a specified minimum input voltage of 2.5V. Below this threshold, undervoltage lockout disables operation to prevent unstable regulation. The device shuts down when VIN drops below ~1.65V, and resumes only after VIN exceeds 2.5V with sufficient hysteresis to avoid oscillation.
LTC3548EMSE#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
LTC3548EMSE#PBF FAQ
1.How can I place an order for LTC3548EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548EMSE#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 LTC3548EMSE#PBF reliable?
The price and inventory of LTC3548EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3548EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3548EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548EMSE#PBF?
LTC3548EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548EMSE#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 LTC3548EMSE#PBF?
For technical support, including LTC3548EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548EMSE#PBF requirements.
6.How does Aetrix verify that LTC3548EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3548EMSE#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 LTC3548EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3548EMSE#PBF?
All LTC3548EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548EMSE#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 LTC3548EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3548EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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