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Analog Devices Inc. LTC3548EDD-2#TRPBF
- Part No.:
- LTC3548EDD-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3548EDD-2#TRPBF.pdf
- Description:
- IC REG BCK BST ADJ/0.6V DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,538
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Product details
Overview
LTC3548EDD-2#TRPBF from Analog Devices (formerly Linear Technology) is a dual synchronous step-down DC/DC regulator with fixed 1.8V/800mA and adjustable 0.6V–VIN outputs, operating at 2.25MHz from 2.5V–5.5V input. It integrates 0.35Ω P-channel and 0.30Ω N-channel MOSFETs, delivers up to 95% efficiency, and supports Burst Mode® and pulse-skipping operation for portable power management in space-constrained applications.
For engineers reviewing the LTC3548EDD-2#TRPBF datasheet, LTC3548EDD-2#TRPBF pinout, LTC3548EDD-2#TRPBF application, or LTC3548EDD-2#TRPBF equivalent, key selection criteria include dual-channel output flexibility, 40μA quiescent current (both channels), 10-Lead 3mm × 3mm DFN package with exposed thermal pad, and integrated Power-On Reset (POR) with –8.5% threshold and 117ms delay.
Technical Context
The LTC3548EDD-2#TRPBF employs a constant-frequency current-mode architecture with shared 2.25MHz clock and in-phase channel operation. Its dual-loop control uses internal 0.6V reference for Channel 2 feedback and fixed resistive divider for Channel 1, enabling precise regulation across load and line variations.
Burst Mode® and pulse-skipping modes are selected via MODE/SYNC pin voltage level, directly altering switching behavior without external components. In dropout, both channels sustain 100% duty cycle with continuous P-channel MOSFET conduction, while POR asserts low when either output falls below –8.5% of regulation and releases after 262,144 clock cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion, Li-polymer, and multi-cell alkaline/NiMH battery inputs without pre-regulation. |
| Channel 1 Output | Fixed 1.8V ±1.8% at 800mA - internally set, eliminating external feedback resistors for core logic rail generation. |
| Channel 2 Output | Adjustable 0.6V to VIN via external resistor divider - enables custom I/O or analog supply voltages with 0.6V reference accuracy. |
| Switching Frequency | 2.25MHz ±25% - enables use of sub-3mm-height inductors (e.g., 2.2μH) and 10μF ceramic capacitors for ultra-thin PCB designs. |
| Quiescent Current | 40μA (both channels active) - extends battery runtime in always-on subsystems such as real-time clocks or sensor wake-up circuits. |
| Shutdown Current | <1μA - meets stringent energy harvesting and long-term storage requirements where leakage must be minimized. |
| Power-On Reset | –8.5% threshold, 117ms delay (pulse-skipping mode) - provides deterministic system initialization timing for microcontrollers and FPGAs. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN with exposed thermal pad (Pin 11 = GND). Requires soldering exposed pad to PCB ground plane for thermal performance (θJA = 40°C/W, θJC = 3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB2 (Pin 10) | Channel 2 feedback input | Receives 0.6V reference-comparison voltage from external resistor divider; sets adjustable output voltage. |
| RUN2 (Pin 9) | Channel 2 enable control | Active-high logic input; must be driven to VIN or GND - floating causes undefined regulator state. |
| POR (Pin 8) | Open-drain power-on reset output | Pulls low if either output is out of regulation; releases high after 262,144 clock cycles once both are stable. |
| SW2 (Pin 7) | Channel 2 switch node | Connects to inductor; swings between VIN and GND - requires low-inductance layout to minimize EMI. |
| MODE/SYNC (Pin 6) | Mode selection & sync input | Tie to VIN for Burst Mode® (high efficiency), GND for pulse-skipping (low ripple); accepts 2.25MHz external clock. |
| SW1 (Pin 4) | Channel 1 switch node | Connects to Channel 1 inductor; identical switching behavior to SW2 but optimized for 800mA load. |
| GND (Pin 5) | Signal ground reference | Not internally connected - must be tied to PCB ground plane adjacent to exposed pad for noise immunity. |
| VIN (Pin 3) | Main input power supply | Supplies both regulators; requires local 10μF ceramic decoupling capacitor placed within 3mm. |
| RUN1 (Pin 2) | Channel 1 enable control | Active-high logic input; independent enable/disable of fixed-output channel without affecting Channel 2. |
| VOUT1 (Pin 1) | Channel 1 output voltage sense | Internal resistive divider output - used only for feedback path; not intended as power delivery terminal. |
Key Features
| Feature | Design Value |
|---|---|
| No external Schottky diodes required | Integrated 0.35Ω P-channel and 0.30Ω N-channel synchronous MOSFETs eliminate conduction losses and board area for discrete rectification. |
| Low-noise pulse-skipping mode | Enables constant 2.25MHz switching down to light loads - maintains tight output voltage ripple (<10mVp-p) for RF and audio subsystems. |
| High-efficiency Burst Mode® | Reduces quiescent current to 40μA while maintaining regulation - achieves >85% efficiency at 1mA load on Channel 1. |
| 100% duty-cycle dropout operation | Allows uninterrupted output during brownout conditions - VOUT tracks VIN minus RDS(ON) × ILOAD with no shutdown gap. |
| Thermally enhanced DFN package | 3mm × 3mm footprint with exposed GND pad delivers 3°C/W junction-to-case thermal resistance - supports 1.2W dissipation in 4-layer board layouts. |
Applications
| Digital Cameras | Cellular Phones |
|---|---|
Use Scenario: Dual-rail power for CMOS image sensor (1.8V digital core) and analog front-end (adjustable 2.5V/2.8V). IC Role / Device Role / Timing Role: Primary dual-output buck regulator managing battery-to-rail conversion with dynamic load response. Use Value: 2.25MHz switching allows use of 2.2μH inductors ≤1.2mm height, meeting strict camera module Z-height constraints. | Use Scenario: Simultaneous powering of application processor core (1.8V) and memory interface (adjustable 1.2V–1.5V). IC Role / Device Role / Timing Role: Compact dual-channel PMIC delivering regulated supplies with independent enable control per rail. Use Value: 40μA quiescent current extends standby time between cellular network handshakes without compromising wake-up latency. |
| Portable Media Players | Wireless Modems |
Use Scenario: Supplying DSP core (1.8V) and audio DAC/ADC (adjustable 3.3V) from single Li-ion cell. IC Role / Device Role / Timing Role: High-efficiency dual buck converter supporting burst-mode playback and low-ripple audio playback modes. Use Value: MODE/SYNC pin enables seamless transition between Burst Mode® (long battery life) and pulse-skipping (clean audio output) via firmware control. | Use Scenario: Powering baseband processor (1.8V) and RF transceiver (adjustable 2.5V) in DSL/wireless CPE devices. IC Role / Device Role / Timing Role: Dual-output regulator with POR output coordinating system-level reset sequencing for modem firmware boot. Use Value: Integrated –8.5% POR threshold and 117ms delay ensure reliable MCU initialization before RF calibration begins. |
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 1.8V/1.2V dual outputs; 2.25MHz switching; 24μA IQ; no POR output; 6-pin WSON package. | Lacks adjustable second output and Power-On Reset - unsuitable for systems requiring custom voltage rails or deterministic reset timing. | Select when fixed dual-rail generation suffices and board space is constrained to <2.5mm² footprint. |
| MAX8646ETE+ | Fixed 1.8V/1.5V dual outputs; 3MHz switching; 30μA IQ; integrated LDO for third rail; 16-pin TQFN package. | Higher pin count and fixed outputs limit flexibility; includes LDO but no POR - adds complexity for simple dual-buck needs. | Prefer when third low-noise supply is required alongside dual bucks, and thermal budget allows larger package. |
Compared with TPS62400DRVR and MAX8646ETE+, the LTC3548EDD-2#TRPBF uniquely combines adjustable second output, integrated POR, and 40μA dual-channel quiescent current in a 3mm × 3mm DFN - making it optimal for compact, battery-powered systems demanding flexible rail generation and robust power sequencing.
Availability
LTC3548EDD-2#TRPBF is available at Aetrix Electronics and suitable for portable media players, cellular handsets, digital cameras, and wireless modems requiring stable component supply with guaranteed long-term manufacturability and consistent electrical specifications.
Supply support for LTC3548EDD-2#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, communications, and industrial markets.
The LTC3548EDD-2#TRPBF belongs to Linear's µPower synchronous buck regulator family, designed specifically for ultra-low-power portable electronics where battery life, board area, and power sequencing reliability are critical design constraints.
FAQ
What is the maximum output current capability of each channel in the LTC3548EDD-2#TRPBF?
The LTC3548EDD-2#TRPBF delivers up to 800mA from its fixed 1.8V Channel 1 and up to 400mA from its adjustable Channel 2. These limits are enforced by internal peak current thresholds of 1.2A (Channel 1) and 0.7A (Channel 2), verified across the –40°C to 85°C operating temperature range. Derating is required above 70°C ambient due to thermal constraints of the 3mm × 3mm DFN package.
How does the MODE/SYNC pin affect operation of the LTC3548EDD-2#TRPBF?
The MODE/SYNC pin on the LTC3548EDD-2#TRPBF serves three functions: tying it to VIN enables Burst Mode® for highest light-load efficiency; grounding it selects pulse-skipping mode for lowest output ripple; applying a 2.25MHz external clock synchronizes switching and forces pulse-skipping mode. The pin must never be left floating, as that causes undefined regulator behavior per the Absolute Maximum Ratings table.
Can the LTC3548EDD-2#TRPBF operate with input voltage below 2.5V?
No - the LTC3548EDD-2#TRPBF has a specified minimum input voltage of 2.5V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this level risks failure to regulate or erratic behavior, as the internal undervoltage lockout circuit disables the device when VIN drops near 1.65V. For sub-2.5V operation, consider the LTC3549 (1.8V–5.5V input) or similar alternatives.
What is the purpose of the exposed pad (Pin 11) on the LTC3548EDD-2#TRPBF DFN package?
The exposed pad (Pin 11) on the LTC3548EDD-2#TRPBF is electrically and thermally connected to GND. It must be soldered to a dedicated PCB ground plane to achieve the specified θJA = 40°C/W and θJC = 3°C/W thermal performance. Leaving it unconnected degrades thermal resistance by >5× and risks junction temperature exceedance under 400mA+ loads.
Does the LTC3548EDD-2#TRPBF support external synchronization of its switching frequency?
Yes - the LTC3548EDD-2#TRPBF supports external synchronization via the MODE/SYNC pin (Pin 6). When a 2.25MHz square wave is applied, the internal oscillator locks to that frequency and automatically enters pulse-skipping mode. This feature enables EMI reduction through frequency dithering or alignment with system clocks, and is validated in the Typical Performance Characteristics section (Figure G05).
LTC3548EDD-2#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 (Fixed)
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V (1.8V)
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 700mA, 1.2A
- 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-2#TRPBF FAQ
1.How can I place an order for LTC3548EDD-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548EDD-2#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-2#TRPBF reliable?
The price and inventory of LTC3548EDD-2#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-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3548EDD-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548EDD-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548EDD-2#TRPBF?
LTC3548EDD-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548EDD-2#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-2#TRPBF?
For technical support, including LTC3548EDD-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548EDD-2#TRPBF requirements.
6.How does Aetrix verify that LTC3548EDD-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3548EDD-2#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-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3548EDD-2#TRPBF?
All LTC3548EDD-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548EDD-2#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-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC3548EDD-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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