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Analog Devices Inc. LTC3548EDD#TRPBF
- Part No.:
- LTC3548EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3548EDD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,357
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Product details
Overview
LTC3548EDD#TRPBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down DC/DC regulator IC designed for low-power portable systems. It delivers 400mA and 800mA per channel from a 2.5V–5.5V input, operates at a fixed 2.25MHz switching frequency, features internal 0.35Ω P-channel/N-channel MOSFETs, and supports adjustable output voltages from 0.6V to 5V - used in digital cameras and cellular phones for compact, high-efficiency power conversion.
For engineers reviewing the LTC3548EDD#TRPBF datasheet, LTC3548EDD#TRPBF pinout, LTC3548EDD#TRPBF application, or LTC3548EDD#TRPBF equivalent, key selection criteria include its dual-channel 2.25MHz constant-frequency operation, Burst Mode® vs pulse-skipping mode selection via MODE/SYNC, integrated power switches eliminating external Schottky diodes, 40μA quiescent current, and 10-lead 3mm × 3mm DFN package with exposed PGND pad.
Technical Context
The LTC3548EDD#TRPBF employs a current-mode, constant-frequency architecture with shared 2.25MHz clock driving two independent synchronous buck regulators. Each channel uses internal P-channel high-side and N-channel low-side MOSFETs (RDS(ON) = 0.35Ω / 0.30Ω), enabling 100% duty-cycle dropout operation and eliminating external diodes.
Its MODE/SYNC pin provides user-selectable low-noise pulse-skipping mode or high-efficiency Burst Mode® operation, while the POR pin delivers a synchronized open-drain reset signal with 117ms delay after regulation is achieved. Feedback is referenced to a precise 0.6V bandgap voltage with ±12mV tolerance over –40°C to 85°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 system rails without external LDO pre-regulation. |
| Switching Frequency | 2.25MHz (typ) - enables use of sub-3mm-height inductors and ≤10μF ceramic capacitors for ultra-thin portable designs. |
| 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 ±12mV (–40°C to 85°C) - sets output voltage via external resistor divider; enables 0.6V–5V adjustment with <0.5% line/load regulation error. |
| Quiescent Current | 40μA (active), <1μA (shutdown) - extends battery runtime in always-on subsystems like real-time clocks or sensor interfaces. |
| Efficiency Peak | 95% - achieved at mid-load with 3.3V input → 1.8V output, reducing thermal load in thermally constrained DFN packages. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed power ground pad (Pin 11), rated for –40°C to +85°C ambient operation. 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 resistive divider output; regulates VOUT1 to 0.6V reference - determines output voltage accuracy and loop stability. |
| RUN1 (Pin 2) | Channel 1 enable control | High = active; low = shutdown - allows independent sequencing or power gating of first regulator. |
| 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 - critical for EMI layout; must be short, low-inductance trace. |
| GND (Pin 5) | Analog ground reference | Separate from PGND pad; connects to quiet analog ground plane - isolates feedback and oscillator noise. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Pull to VIN = Burst Mode®; pull to GND = pulse-skipping; apply external 2.25MHz clock = synchronization - configures light-load behavior and timing coordination. |
| SW2 (Pin 7) | Channel 2 switch node | Identical function to SW1 but for second regulator - requires independent inductor and layout isolation to prevent cross-talk. |
| POR (Pin 8) | Power-on reset output | Open-drain; asserts low if either VOUT drops >8.5% below target - provides system-level reset timing with 117ms delay after regulation. |
| RUN2 (Pin 9) | Channel 2 enable control | Independent enable for second regulator - supports staggered startup or dynamic power management. |
| VFB2 (Pin 10) | Channel 2 feedback input | Same function as VFB1 for VOUT2 - enables dual independent output programming (e.g., 1.8V + 2.5V). |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck topology | Eliminates external Schottky diodes and reduces BOM count/cost while improving efficiency by ~5–8% over asynchronous designs. |
| Burst Mode® operation | Reduces quiescent current to 40μA and maintains >80% efficiency down to 100μA load - ideal for standby or sleep modes in battery-powered devices. |
| 100% duty-cycle dropout | Enables VOUT ≈ VIN − ILOAD×RDS(ON) during brownout - preserves functionality when input voltage sags near output level. |
| Externally synchronizable oscillator | Accepts 2.25MHz external clock on MODE/SYNC pin to eliminate beat frequencies in multi-rail systems - critical for EMI-sensitive RF or audio applications. |
| Integrated power-on reset | Provides deterministic system initialization with 117ms timeout - removes need for discrete reset IC and simplifies power sequencing. |
Applications
| PDAs / Palmtop PCs | Digital Cameras |
|---|---|
Use Scenario: Powering core logic (1.8V) and image sensor interface (2.5V) from single Li-ion cell in handheld computing device. IC Role / Device Role / Timing Role: Dual-output step-down regulator providing independently enabled, low-noise, high-efficiency DC rails with coordinated reset signaling. Use Value: Reduces component count versus two discrete regulators; Burst Mode® extends battery life during idle periods without compromising transient response during wake-up. | Use Scenario: Supplying processor core (1.2V), memory I/O (1.8V), and CCD/CMOS sensor bias (2.8V) in compact camera module. IC Role / Device Role / Timing Role: Dual synchronous buck converter delivering tightly regulated, low-ripple outputs with fast load-step recovery for burst capture sequences. Use Value: 2.25MHz operation enables use of 2.2μH/4.7μH shielded inductors under 1mm height - meets strict Z-height constraints in slim camera bodies. |
| Cellular Phones | Wireless Modems |
Use Scenario: Generating application processor core (1.0V) and RF transceiver (2.8V) supplies in LTE smartphone power tree. IC Role / Device Role / Timing Role: Dual-channel DC/DC regulator supporting dynamic voltage scaling and independent enable/disable for subsystem power gating. Use Value: Pulse-skipping mode minimizes output ripple during sensitive RF transmission phases; POR ensures clean boot before baseband initialization. | Use Scenario: Powering baseband SoC (1.8V) and Wi-Fi/BT radio (3.3V) in embedded M.2 or mini-PCIe wireless modules. IC Role / Device Role / Timing Role: Compact dual buck regulator with thermal-aware design for convection-cooled modem cards operating in extended temperature ranges. Use Value: Exposed PGND pad and 45°C/W θJA enable reliable 800mA operation at 85°C ambient - avoids derating or forced-air cooling. |
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; no adjustable feedback; lower max input (5.5V same); 2.25MHz same; 600mA/600mA rating. | Not suitable for custom voltage combinations; limited to predefined dual-rail configurations. | Select when standard 1.2V+1.8V is sufficient and board space favors 2mm × 2mm WSON. |
| MAX17504ATP+ | Higher current (1.2A/1.2A); wider input (4.5V–28V); 400kHz–2.2MHz programmable frequency; requires external MOSFETs. | Designed for industrial/high-voltage inputs; not pin-compatible; needs external power stage and compensation. | Select for higher-power or wide-input applications where discrete FET control and thermal flexibility are prioritized. |
Compared with TPS62400DRVR and MAX17504ATP+, the LTC3548EDD#TRPBF uniquely combines adjustable dual outputs, integrated FETs, 2.25MHz fixed frequency, and Burst Mode® in a 3mm × 3mm DFN - making it optimal for space-constrained, battery-operated consumer electronics requiring flexible rail generation and ultra-low IQ.
Availability
LTC3548EDD#TRPBF is available at Aetrix Electronics and suitable for digital cameras, cellular phones, and portable media players requiring stable component supply across production lifecycles.
Supply support for LTC3548EDD#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.
The LTC3548EDD#TRPBF belongs to Linear's µPower DC/DC converter family, engineered specifically for ultra-low-quiescent-current, high-frequency operation in battery-powered portable electronics.
FAQ
What is the maximum output current per channel for the LTC3548EDD#TRPBF?
The LTC3548EDD#TRPBF supports up to 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 assume proper thermal design with the exposed PGND pad soldered to a 4-layer PCB ground plane and operation within the –40°C to +85°C ambient range. Derating applies above 60°C ambient.
How does the MODE/SYNC pin affect LTC3548EDD#TRPBF operation?
The MODE/SYNC pin on the LTC3548EDD#TRPBF selects between Burst Mode® (pin tied to VIN) for highest light-load efficiency or pulse-skipping mode (pin tied to GND) for lowest output ripple. When driven by an external 2.25MHz clock, it forces pulse-skipping mode and synchronizes switching edges - preventing beat frequencies in multi-regulator systems.
Can LTC3548EDD#TRPBF operate with input voltage below 2.5V?
No - the LTC3548EDD#TRPBF has a guaranteed operating input voltage range of 2.5V to 5.5V. Below 2.5V, undervoltage lockout disables switching; the absolute minimum VIN is –0.3V, and maximum is 6V. Operation below 2.5V risks failure to regulate or erratic POR behavior and is outside specification.
What is the purpose of the exposed pad (Pin 11) on the LTC3548EDD#TRPBF DFN package?
The exposed pad (Pin 11) on the LTC3548EDD#TRPBF is designated PGND and must be soldered to the PCB's power ground plane. It serves dual functions: lowering thermal resistance (θJA = 45°C/W) to sustain full output current at elevated temperatures, and providing low-inductance return path for high-frequency switch currents - critical for EMI control and regulation stability.
Does LTC3548EDD#TRPBF support independent voltage programming for each channel?
Yes - the LTC3548EDD#TRPBF supports fully independent output voltage programming via separate feedback dividers connected to VFB1 and VFB2 pins. Each channel uses the same 0.6V internal reference, allowing outputs to be set anywhere from 0.6V to 5V using standard resistor ratios. No coupling or shared components are required between channels.
LTC3548EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3548EDD#TRPBF FAQ
1.How can I place an order for LTC3548EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548EDD#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 LTC3548EDD#TRPBF reliable?
The price and inventory of LTC3548EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3548EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3548EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548EDD#TRPBF?
LTC3548EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548EDD#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 LTC3548EDD#TRPBF?
For technical support, including LTC3548EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3548EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3548EDD#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 LTC3548EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3548EDD#TRPBF?
All LTC3548EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548EDD#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 LTC3548EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3548EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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