My Inquiry
My Account
Analog Devices Inc. LTC3548EDD-1#PBF
- Part No.:
- LTC3548EDD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3548EDD-1#PBF.pdf
- Description:
- IC REG BUCK 1.575V/1.8V DL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,105
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3548EDD-1#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, fixed-output, synchronous step-down DC/DC converter optimized for low-power portable applications. It delivers 1.8V at up to 800mA and 1.575V at up to 400mA from a 2.5V–5.5V input, operating at a constant 2.25MHz switching frequency with internal 0.35Ω/0.30Ω MOSFETs and Burst Mode® operation for ultra-low quiescent current (40μA).
For engineers reviewing the LTC3548EDD-1#PBF datasheet, LTC3548EDD-1#PBF pinout, LTC3548EDD-1#PBF application, or LTC3548EDD-1#PBF equivalent, key selection considerations include its dual fixed-output architecture, 3mm × 3mm DFN-10 package with exposed thermal pad, 100% duty-cycle dropout capability, and compatibility with ceramic capacitors and low-profile inductors ≤1mm height.
Technical Context
The LTC3548EDD-1#PBF employs a constant-frequency, current-mode control architecture with synchronized in-phase operation across both channels. Each channel uses an internal 0.6V reference and resistive feedback divider to regulate output voltage without external resistors.
It integrates P-channel high-side and N-channel low-side synchronous power switches (RDS(ON) = 0.35Ω / 0.30Ω), supports independent enable (RUN1/RUN2) control, and features undervoltage lockout (~1.65V), short-circuit protection, and thermal shutdown at ~150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.5V to 5.5V - supports single-cell Li-ion (2.8V–4.2V) and regulated 3.3V/5V rails without external LDO pre-regulation. |
| VOUT1 / VOUT2 | Fixed 1.8V / 1.575V - eliminates external feedback resistors; precision trimmed to ±2% over –40°C to 85°C. |
| Switching Frequency | 2.25MHz (±25%) - enables use of sub-3mm-height inductors and 10μF ceramic input/output capacitors. |
| Max Output Current | 800mA (Ch1) / 400mA (Ch2) - defined by peak switch current limits of 1.2A / 0.7A and thermal design margin in DFN package. |
| IQ (Active) | 40μA total - enables >1-week battery runtime in standby mode for handheld devices drawing microampere loads. |
| IQ (Shutdown) | <1μA - ensures negligible battery drain during system sleep or power-off states. |
| Efficiency Peak | 95% - achieved at mid-load (e.g., 400mA @ 1.8V, VIN=3.6V), minimizing thermal rise in compact enclosures. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN (DD package), 0.75mm nominal height, exposed thermal pad (Pin 11) soldered to PCB ground plane for optimal thermal performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB2 (Pin 10) | Channel 2 feedback input | Receives divided output voltage; internally referenced to 0.6V - no external resistor network required. |
| VOUT2 (Pin 9) | Channel 2 output sense node | Internal resistive divider tap for VFB2 - must be routed with low-impedance, noise-immune trace. |
| RUN1 (Pin 8) | Channel 1 enable control | Logic-high (≥1.5V) enables regulator 1; logic-low (≤0.3V) forces shutdown - requires active drive, not floating. |
| SW2 (Pin 7) | Channel 2 switch node | Connects to inductor; swings between VIN and GND - requires tight layout with minimal loop area to reduce EMI. |
| RUN2 (Pin 6) | Channel 2 enable control | Independent enable for second regulator - allows staggered power-up or dynamic channel disabling. |
| VOUT1 (Pin 2) | Channel 1 output sense node | Internal resistive divider tap for VFB1 - shared ground reference critical for cross-regulator stability. |
| VIN (Pin 3) | Main power input | Supplies both channels; requires local 10μF ceramic decoupling directly at pin with short, wide traces. |
| GND (Pin 5) | Signal ground reference | Not internally connected - must be tied to PCB ground plane and exposed pad for noise immunity and thermal conduction. |
| Exposed Pad (Pin 11) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane; primary path for heat dissipation and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-output regulation | Eliminates four external feedback resistors and associated layout area; reduces BOM count and calibration risk. |
| 2.25MHz constant-frequency operation | Enables full ceramic capacitor designs with <1mm component height - critical for ultra-thin mobile form factors. |
| Burst Mode® at light load | Reduces IQ to 40μA while maintaining output regulation - extends battery life without sacrificing transient response. |
| 100% duty-cycle dropout | Maintains regulation down to VIN ≈ VOUT + IOUT×RDS(ON) - preserves system operation during battery voltage sag. |
| Integrated synchronous MOSFETs | 0.35Ω (high-side) / 0.30Ω (low-side) RDS(ON) - eliminates Schottky diode losses and board space, improving efficiency by 5–10% vs. asynchronous designs. |
Applications
| PDAs / Palmtop PCs | Digital Cameras |
|---|---|
Use Scenario: Powering core logic (1.8V) and image sensor interface (1.575V) from a single Li-ion cell in a handheld organizer with <12mm profile. IC Role / Device Role / Timing Role: Dual-output buck regulator providing tightly regulated, low-noise supply rails with independent enable control for subsystem power sequencing. Use Value: Enables simultaneous 800mA/400mA delivery in 3mm × 3mm footprint - reduces PCB area by 40% vs. discrete dual-regulator solutions. | Use Scenario: Supplying CMOS image sensor (1.575V) and baseband processor (1.8V) in a compact point-and-shoot camera with burst capture mode. IC Role / Device Role / Timing Role: High-efficiency, fast-transient DC/DC converter supporting rapid load steps during auto-focus and flash charging cycles. Use Value: 2.25MHz switching minimizes output ripple (<20mV) and enables ceramic capacitor use - eliminates audible coil whine during video recording. |
| Cellular Phones | Portable Media Players |
Use Scenario: Generating application processor core (1.8V) and memory I/O (1.575V) rails in a GSM/UMTS handset with aggressive thermal constraints. IC Role / Device Role / Timing Role: Thermally enhanced dual buck regulator delivering stable outputs under RF-induced load transients and ambient temperatures up to 85°C. Use Value: Exposed pad thermal design achieves <85°C junction temp at full load in 70°C ambient - avoids thermal throttling during call duration. | Use Scenario: Powering audio DAC (1.575V) and SoC core (1.8V) in an MP3 player with 100-hour battery life target. IC Role / Device Role / Timing Role: Ultra-low-quiescent-current regulator enabling extended standby via independent RUN pin control and Burst Mode® operation. Use Value: 40μA total IQ extends battery life by 3.2 days per 100mAh capacity - verified across –40°C to 85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62400DRVR | Fixed 1.8V/1.5V outputs; 2.25MHz switching; 0.45Ω/0.55Ω RDS(ON); 65μA IQ | Lower max current (600mA/300mA); higher RDS(ON) increases dropout loss at 400mA+ loads | Select when lower cost is prioritized over peak efficiency and thermal margin. |
| MAX1724EUT+T | Adjustable outputs (requires external resistors); 2.4MHz; 0.3Ω/0.25Ω RDS(ON); 25μA IQ | Requires 4 external resistors; lacks independent RUN pins; smaller 2mm × 2mm TDFN package | Select when board space is critical and adjustable voltages are needed for future design reuse. |
Compared with LTC3548EDD-1#PBF, the TPS62400DRVR offers lower cost but reduced current capability and higher quiescent current, while the MAX1724EUT+T saves board area and cuts IQ further but adds BOM complexity and removes fixed-voltage convenience.
Availability
LTC3548EDD-1#PBF is available at Aetrix Electronics and suitable for portable media players, digital cameras, and cellular handsets requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LTC3548EDD-1#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The LTC3548-1 belongs to Linear's high-frequency synchronous buck regulator product line, designed specifically for space-constrained, battery-powered portable electronics demanding dual fixed outputs, ultra-low IQ, and minimal external components.
FAQ
What is the maximum input voltage rating for the LTC3548EDD-1#PBF?
The LTC3548EDD-1#PBF has an absolute maximum input voltage rating of 6V. Operation above 5.5V violates the recommended operating conditions and may cause permanent damage. The device is specified for continuous operation from 2.5V to 5.5V, making it ideal for single-cell Li-ion (2.8V–4.2V) and regulated 3.3V systems. Exceeding 6V on VIN, even momentarily, risks latch-up or gate oxide failure in the integrated MOSFETs.
Does the LTC3548EDD-1#PBF require external feedback resistors?
No, the LTC3548EDD-1#PBF does not require external feedback resistors. Its outputs are factory-trimmed fixed voltages: 1.8V for Channel 1 and 1.575V for Channel 2. Internal resistive dividers set the feedback ratio, with VFB1 and VFB2 pins referenced to a precise 0.6V internal bandgap. This eliminates four external resistors, reduces layout sensitivity, and ensures consistent output accuracy across temperature and unit-to-unit variation.
How does Burst Mode® operation improve efficiency in the LTC3548EDD-1#PBF?
Burst Mode® operation in the LTC3548EDD-1#PBF reduces quiescent current to 40μA by disabling the main control loop during light loads and pulsing the power switches only when output voltage droop exceeds regulation limits. This eliminates continuous switching losses dominated by MOSFET gate charge, significantly extending battery life in standby modes. Unlike pulse-skipping, Burst Mode® maintains tight output voltage regulation and fast wake-up response - critical for always-on portable devices.
What is the thermal performance of the LTC3548EDD-1#PBF in its DFN package?
The LTC3548EDD-1#PBF in the 3mm × 3mm DFN package has a junction-to-ambient thermal resistance (θJA) of 40°C/W when mounted on a standard 4-layer PCB with the exposed pad fully soldered to a solid ground plane. At full load (800mA/400mA) and 70°C ambient, calculated junction temperature remains below 85°C - well within the 125°C maximum. Thermal derating is required only near dropout (VIN ≈ VOUT) where RDS(ON) rises and conduction losses dominate.
Can the LTC3548EDD-1#PBF operate with ceramic input and output capacitors only?
Yes, the LTC3548EDD-1#PBF is fully compatible with all-ceramic capacitor designs. Its current-mode control architecture and internal compensation are optimized for low-ESR ceramics. The typical application uses 10μF X5R/X7R ceramic capacitors for CIN, COUT1, and COUT2. However, care must be taken to avoid instability: use only X5R/X7R dielectrics, place 0.1μF high-frequency bypass caps close to VIN/GND, and avoid long input traces from wall adapters to prevent ringing-induced damage.
LTC3548EDD-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.575V, 1.8V
- Voltage - Output (Max):
- -
- 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-1#PBF FAQ
1.How can I place an order for LTC3548EDD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548EDD-1#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 LTC3548EDD-1#PBF reliable?
The price and inventory of LTC3548EDD-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3548EDD-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3548EDD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548EDD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548EDD-1#PBF?
LTC3548EDD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548EDD-1#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 LTC3548EDD-1#PBF?
For technical support, including LTC3548EDD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548EDD-1#PBF requirements.
6.How does Aetrix verify that LTC3548EDD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3548EDD-1#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 LTC3548EDD-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3548EDD-1#PBF?
All LTC3548EDD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548EDD-1#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 LTC3548EDD-1#PBF part is unused and in its original packaging.
Return procedure for LTC3548EDD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3548EDD-1#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
