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Analog Devices Inc. LTC3548AIMSE#PBF
- Part No.:
- LTC3548AIMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3548AIMSE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,462
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Product details
Overview
LTC3548AIMSE#PBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down DC/DC regulator IC with independent 400mA and 800mA output channels, operating from 2.5V–5.5V input and delivering adjustable 0.6V–5V outputs at 2.25MHz switching frequency. It integrates 0.35Ω P-channel and 0.30Ω N-channel MOSFETs, supports Burst Mode® and pulse-skipping operation, and features power-on reset (POR), external synchronization, and soft-start capability - deployed in space-constrained portable electronics requiring high efficiency and low quiescent current.
For engineers reviewing the LTC3548AIMSE#PBF datasheet, LTC3548AIMSE#PBF pinout, LTC3548AIMSE#PBF application, or LTC3548AIMSE#PBF equivalent, key selection considerations include its dual-channel current rating asymmetry (400mA/800mA), 10-lead MSOP package with exposed pad, 40μA quiescent current in active mode, ±8.5% POR threshold, and mode-selectable light-load behavior - all critical for battery-powered PDA, digital camera, and cellular phone power architectures.
Technical Context
The LTC3548AIMSE#PBF employs a constant-frequency current-mode control architecture with shared 2.25MHz oscillator across both channels, enabling precise phase alignment and predictable EMI profiles. Its dual-loop design uses separate VFB1/VFB2 inputs with 0.6V reference and independent RUN/SS1/RUN/SS2 enable/soft-start pins to support staggered startup and independent channel shutdown.
Operation includes three distinct low-power states: continuous conduction mode (CCM), pulse-skipping mode (low ripple, fixed frequency down to light loads), and Burst Mode® (intermittent switching, 40μA IQ, higher ripple). The MODE/SYNC pin serves dual function - selecting mode or accepting external clock up to 2.25MHz - while the POR pin provides open-drain reset assertion when either output deviates >±8.5% from regulation, with 65,536-cycle (≈29ms) release delay in pulse-skipping mode.
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-2mm-height inductors and 10μF ceramic capacitors for ultra-compact layouts. |
| Output Current Capability | Channel 1: 400mA; Channel 2: 800mA - asymmetric rating allows optimized power delivery for core vs I/O rails. |
| Feedback Reference Voltage | 0.6V ±1.2% (–40°C to 125°C) - sets output via external resistor divider; enables 0.6V–5V adjustment range. |
| Quiescent Current | 40μA (active, Burst Mode®) - extends battery runtime in standby; <1μA in shutdown. |
| Power-On Reset Threshold | ±8.5% output deviation - ensures system-level reset only when both outputs are stably regulated. |
| Internal Switch RDS(ON) | P-channel: 0.35Ω; N-channel: 0.30Ω - eliminates need for external Schottky diodes and improves full-load efficiency to 95%. |
Pinout & Package
Package: 10-lead plastic MSOP with exposed thermal pad (Pin 11 = PGND), 3mm × 3mm footprint, 1.1mm max height - thermally enhanced for high-density portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB1 (Pin 1) | Channel 1 feedback input | Connects to resistive divider; regulates VOUT1 to 0.6V reference; 30nA input bias minimizes divider current loss. |
| RUN/SS1 (Pin 2) | Channel 1 enable & soft-start | High = enable; low = shutdown; RC network on this pin controls ramp rate of VOUT1 during startup. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling to minimize high-frequency noise injection. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to inductor; swings between VIN and GND; layout must minimize loop area to reduce EMI. |
| NC (Pin 5) | No connect | Internally unconnected; recommended to tie to GND on PCB for shielding and thermal conduction. |
| MODE/SYNC (Pin 6) | Mode select / sync input | Tied to VIN = Burst Mode®; tied to GND = pulse-skipping; driven by external 2.25MHz clock = synchronized operation. |
| SW2 (Pin 7) | Channel 2 switch node | Independent switch node for second inductor; identical electrical behavior to SW1. |
| POR (Pin 8) | Power-on reset output | Open-drain; pulled low if either VOUT1 or VOUT2 is out of ±8.5% regulation; releases after 65,536 clock cycles. |
| RUN/SS2 (Pin 9) | Channel 2 enable & soft-start | Functionally identical to RUN/SS1 but for VOUT2; supports independent sequencing or fault isolation. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same 0.6V reference as VFB1; enables independent output voltage setting for dual-rail systems. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent synchronous buck regulators | Enables compact dual-rail power supply (e.g., 1.8V core + 2.5V I/O) without external diodes or discrete controllers. |
| User-selectable light-load operation | Burst Mode® (40μA IQ) or pulse-skipping (low ripple) - selectable per system noise vs battery life trade-off. |
| Integrated 0.35Ω/0.30Ω MOSFETs | Eliminates external Schottky diodes and reduces BOM count; achieves >90% efficiency at 100mA load. |
| Power-on reset with ±8.5% accuracy | Provides reliable system-level reset signaling without external supervisor IC; supports daisy-chained reset timing. |
| External frequency synchronization | Allows multiple LTC3548AIMSE#PBF devices or other converters to operate at same frequency, easing EMI filtering. |
Applications
| PDAs and Palmtop PCs | Digital Cameras |
|---|---|
Use Scenario: Power management for ARM-based handheld computing with separate core (1.2V) and memory/I/O (2.5V or 3.3V) rails. IC Role / Device Role / Timing Role: Dual-output synchronous buck regulator providing sequenced, low-noise, high-efficiency DC/DC conversion with integrated POR for system boot integrity. Use Value: Reduces solution size by eliminating two discrete regulators and external reset IC; 40μA Burst Mode® IQ extends standby time beyond 72 hours on single Li-ion cell. |
Use Scenario: Compact image sensor and processor power in consumer-grade digital cameras with flash LED support. IC Role / Device Role / Timing Role: Supplies 1.8V digital core and 2.5V analog sensor rails simultaneously; POR ensures clean boot before image capture initialization. Use Value: 2.25MHz operation enables use of 2.2μH/4.7μH shielded inductors under 1.2mm height; supports rapid wake-from-sleep response required for burst-mode photography. |
| Cellular Phones | Wireless Modems |
Use Scenario: Baseband processor and RF transceiver power in 3G/4G feature phones with tight thermal and height constraints. IC Role / Device Role / Timing Role: Delivers 1.2V/1.8V dual rails with independent RUN/SS control for dynamic power gating; MODE/SYNC pin enables EMI reduction via frequency alignment with baseband clock. Use Value: 100% duty-cycle dropout operation maintains regulation down to VIN = VOUT + ILOAD×RDS(ON), critical during Li-ion battery sag below 3.2V. |
Use Scenario: Powering LTE/Wi-Fi SoC and external PA in portable broadband modems operating from USB or battery. IC Role / Device Role / Timing Role: Provides stable 1.1V core and 3.3V interface rails; POR output drives modem's reset line to ensure firmware reload after brownout recovery. Use Value: Pulse-skipping mode option suppresses output ripple below 35mVP-P at light loads - essential for sensitive RF front-end stability during idle periods. |
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 |
|---|---|---|---|
| TPS62150ARGTR | Single-output 1A buck; no dual-channel capability; 2.5V–6V input; 3MHz switching; no POR or MODE/SYNC pin. | Requires two units for dual-rail designs; lacks integrated reset and mode selection; smaller 16-pin QFN (3×3mm). | Select when only one regulated rail is needed and highest possible switching frequency (3MHz) is prioritized over integration. |
| MAX17504ATP+T | Dual-output (2A/2A); 4.5V–36V input; 400kHz–2.2MHz programmable frequency; no integrated POR; larger 20-pin TQFN. | Targets industrial/high-voltage apps; lacks Burst Mode®; higher minimum input limits use in Li-ion systems without LDO pre-bias. | Select for wide-input industrial applications where 2.5V–5.5V range is insufficient and higher current per channel is required. |
Compared with TPS62150ARGTR and MAX17504ATP+T, the LTC3548AIMSE#PBF uniquely delivers matched dual-channel integration, ±8.5% POR, and user-selectable light-load modes in a 10-lead MSOP - making it optimal for space- and battery-life-constrained portable electronics where dual low-voltage rails and system-level reset coordination are mandatory.
Availability
LTC3548AIMSE#PBF is available at Aetrix Electronics and suitable for PDAs, digital cameras, and cellular phones requiring stable component supply, long-lifecycle availability, and guaranteed RoHS-compliant packaging.
Supply support for LTC3548AIMSE#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 full technical support, documentation, and product continuity for the LTC® portfolio of high-performance power management ICs.
The LTC3548AIMSE#PBF belongs to Linear Technology's precision dual-output DC/DC converter family, designed specifically for battery-powered portable electronics demanding high efficiency, minimal board area, and robust power sequencing capabilities.
FAQ
What is the maximum junction temperature rating for the LTC3548AIMSE#PBF?
The LTC3548AIMSE#PBF has a maximum junction temperature (TJMAX) of 125°C, with thermal resistance θJA = 45°C/W and θJC = 10°C/W. This rating applies across its specified –40°C to 125°C operating junction temperature range, and the exposed pad (Pin 11) must be soldered to PCB ground for effective thermal dissipation. Designers should verify board-level thermal performance using the formula TJ = TA + (PD × θJA) under worst-case load conditions.
Does the LTC3548AIMSE#PBF support independent voltage setting for each output channel?
Yes, the LTC3548AIMSE#PBF supports fully independent voltage setting via separate feedback networks: VFB1 (Pin 1) controls VOUT1 and VFB2 (Pin 10) controls VOUT2, each referenced to an internal 0.6V precision bandgap. Using standard resistor dividers, outputs can be set independently from 0.6V to 5V - for example, 1.2V on Channel 1 and 2.8V on Channel 2 - without cross-regulation impact, as confirmed in the Electrical Characteristics table and Typical Application schematic.
How does the MODE/SYNC pin affect operation of the LTC3548AIMSE#PBF?
The MODE/SYNC pin (Pin 6) serves two mutually exclusive functions: when DC-biased to VIN, it enables Burst Mode® operation for lowest quiescent current (40μA); when tied to GND, it selects pulse-skipping mode for minimal output ripple (<35mVP-P). When driven by an external 2.25MHz clock, it forces pulse-skipping mode and synchronizes both channels to the external source - preventing beat frequencies in multi-converter systems.
What is the purpose and behavior of the POR pin on the LTC3548AIMSE#PBF?
The POR (Power-On Reset) pin (Pin 8) is an open-drain output that remains low whenever either VOUT1 or VOUT2 deviates by more than ±8.5% from its target voltage. Once both outputs are within regulation, a 65,536-cycle timer starts; POR goes high after ≈29ms in pulse-skipping mode. In Burst Mode®, the delay extends due to intermittent clocking - a known behavior documented in the Applications Information section to prevent premature system release.
Can the LTC3548AIMSE#PBF operate with input voltage below 2.5V?
No, the LTC3548AIMSE#PBF has a specified minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. An undervoltage lockout circuit disables operation below ≈1.65V to prevent instability, but the device is not characterized or guaranteed for operation between 1.65V and 2.5V. Attempting to operate below 2.5V may result in failure to regulate, erratic POR behavior, or undefined switching - consistent with Linear Technology's published specifications for the LTC3548A family.
LTC3548AIMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3548AIMSE#PBF FAQ
1.How can I place an order for LTC3548AIMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548AIMSE#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 LTC3548AIMSE#PBF reliable?
The price and inventory of LTC3548AIMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3548AIMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3548AIMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548AIMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548AIMSE#PBF?
LTC3548AIMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548AIMSE#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 LTC3548AIMSE#PBF?
For technical support, including LTC3548AIMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548AIMSE#PBF requirements.
6.How does Aetrix verify that LTC3548AIMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3548AIMSE#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 LTC3548AIMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3548AIMSE#PBF?
All LTC3548AIMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548AIMSE#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 LTC3548AIMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3548AIMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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