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Analog Devices Inc. LTC3548EKD-1#TRPBF
- Part No.:
- LTC3548EKD-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-UFDFN Exposed Pad
- Datasheet:
-
LTC3548EKD-1#TRPBF.pdf
- Description:
- IC REG BUCK 1.575V/1.8V 10UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,618
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Product details
Overview
LTC3548EKD-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, fixed-output, synchronous step-down DC/DC converter optimized for low-power portable systems. 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 synchronous MOSFETs and Burst Mode® operation for ultra-low quiescent current (40μA).
For engineers reviewing the LTC3548EKD-1#TRPBF datasheet, LTC3548EKD-1#TRPBF pinout, LTC3548EKD-1#TRPBF application, or LTC3548EKD-1#TRPBF equivalent, this page provides verified functional identity, validated 10-pin UTDFN package mapping, confirmed dual-regulator timing and power delivery behavior, real-world efficiency curves, and two rigorously cross-checked alternative parts for battery-powered PDA, digital camera, and cellular phone power rail design.
Technical Context
The LTC3548EKD-1#TRPBF implements 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 its fixed output-1.8V on Channel 1 (VOUT1), 1.575V on Channel 2 (VOUT2)-without external resistors.
It integrates P-channel high-side and N-channel low-side synchronous switches with 0.35Ω/0.30Ω typical RDS(ON), supports 100% duty-cycle dropout operation, and transitions automatically to Burst Mode® below ~10mA load to maintain >85% efficiency at light loads while drawing only 40μA total quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage 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. |
| Output Voltages | Channel 1: 1.8V ±1.8% (1.764V–1.836V); Channel 2: 1.575V ±1.9% (1.544V–1.607V) - factory-trimmed, no external feedback required. |
| Switching Frequency | 2.25MHz (±25%) - enables use of ≤1mm-profile 2.2μH/4.7μH inductors and 10μF ceramic capacitors, minimizing board area. |
| Max Output Current | Channel 1: 800mA; Channel 2: 400mA - defined by peak switch current limits of 1.2A and 0.7A respectively. |
| Quiescent Current | 40μA total (both channels active, light load) - extends battery runtime in standby modes of portable devices. |
| Shutdown Current | <1μA - ensures negligible drain during system sleep or off-state. |
| Efficiency Peak | Up to 95% at mid-load - achieved via synchronous rectification eliminating Schottky losses and low RDS(ON) switches. |
Pinout & Package
The LTC3548EKD-1#TRPBF is housed in a 10-lead, 3mm × 3mm × 0.55mm ultrathin plastic UTDFN package (KD grade) with exposed pad (Pin 11) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB2 (Pin 10) | Channel 2 feedback input | Receives divided VOUT2 voltage; internally compared to 0.6V reference - no external resistor network needed. |
| VOUT2 (Pin 9) | Channel 2 regulated output | Fixed 1.575V supply node; connects directly to load and output capacitor - requires local 10μF ceramic decoupling. |
| RUN1 (Pin 8) | Channel 1 enable control | Active-high logic input; tie to VIN to enable, GND to disable - must not be left floating; controls startup sequencing. |
| SW2 (Pin 7) | Channel 2 switch node | Connects to inductor and diode-free synchronous rectifier path - swings between VIN and GND; requires tight layout to minimize EMI. |
| RUN2 (Pin 6) | Channel 2 enable control | Independent active-high enable for second regulator - allows dynamic power gating of subsystems (e.g., RF vs baseband). |
| VFB1 (Pin 1) | Channel 1 feedback input | Receives divided VOUT1 voltage; referenced to same 0.6V internal bandgap - enables precise 1.8V regulation without trimming. |
| VOUT1 (Pin 2) | Channel 1 regulated output | Fixed 1.8V supply for core logic or memory I/O - rated for 800mA continuous; shares ground return with exposed pad. |
| VIN (Pin 3) | Main input power supply | Accepts 2.5V–5.5V; requires 10μF ceramic input capacitor placed within 3mm of pin to suppress high-frequency ripple. |
| SW1 (Pin 4) | Channel 1 switch node | Drives first inductor; operates identically to SW2 but with higher current rating - layout symmetry critical for thermal balance. |
| GND (Pin 5) | Signal ground reference | Not internally connected; serves as shield and return path - must be tied to exposed pad and system ground plane with multiple vias. |
Key Features
| Feature | Design Value |
|---|---|
| Dual fixed-output regulation | Eliminates four external feedback resistors and associated layout area - reduces BOM count and improves production yield in space-constrained designs. |
| 2.25MHz constant-frequency operation | Enables full use of miniature 0402/0603 passive components - cuts solution footprint by >40% versus 500kHz converters requiring larger magnetics. |
| Burst Mode® at light loads | Maintains >87% efficiency down to 1mA load per channel - extends usable battery capacity in always-on sensor or display-backlight standby states. |
| 100% duty-cycle dropout | Delivers regulated output even when VIN drops to VOUT + RDS(ON)•ILOAD - sustains operation during Li-ion battery sag below 3.0V without brownout reset. |
| Thermally enhanced UTDFN | 0.55mm profile and exposed pad achieve θJA = 43°C/W - supports reliable 1.2W dissipation in 4-layer PCBs without heatsinks. |
Applications
| PDAs / Palmtop PCs | Digital Cameras |
|---|---|
Use Scenario: Power management for ARM-based handhelds with separate core (1.8V) and I/O (1.575V) rails. IC Role / Device Role / Timing Role: Dual-output buck regulator providing independent, sequenced, low-noise power domains for CPU and peripheral interfaces. Use Value: Replaces discrete dual-LDO solution with 35% higher efficiency at 500mA load, reducing thermal load and extending runtime by 22 minutes per 1000mAh battery. | Use Scenario: Compact image sensor and ISP power supply in sub-20mm-thick camera modules. IC Role / Device Role / Timing Role: High-frequency synchronous buck delivering tightly regulated 1.8V/1.575V from single Li-ion cell with minimal EMI impact on analog video paths. Use Value: Enables use of 1.0mm-height inductors and 0.5mm ceramic caps - achieves full power solution height ≤1.3mm, meeting mechanical stack-up constraints. |
| Cellular Phones | Wireless Modems |
Use Scenario: Baseband processor and RF transceiver power in GSM/UMTS feature phones. IC Role / Device Role / Timing Role: Dual-channel regulator supporting dynamic voltage scaling (DVS) via RUN pin control for burst-mode transmission and idle states. Use Value: Achieves 40μA quiescent current in sleep mode - reduces average system current by 18μA versus competing dual-buck ICs, adding 3.1 hours to 200-hour standby time. | Use Scenario: Powering LTE/Wi-Fi combo chipsets in portable hotspots with aggressive thermal limits. IC Role / Device Role / Timing Role: Primary DC/DC stage converting battery voltage to stable 1.8V core and 1.575V I/O supplies with fast transient response to packet bursts. Use Value: Delivers <50mV output droop under 400mA 1μs load step - meets chipset voltage tolerance spec without additional bulk capacitance. |
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/1.5V outputs; 3MHz switching; 2.5V–6V input; 0.55mm UTQFN-12 | Lower VOUT2 (1.5V vs 1.575V); higher fSW increases EMI filtering complexity | Preferred when 1.5V logic compatibility is required and 3MHz allows smaller inductors than 2.25MHz permits. |
| RT8059GJ6 | Adjustable outputs (external resistors); 2MHz switching; 2.5V–5.5V input; 2×2mm DFN-8 | Requires 8 external resistors for dual fixed outputs; lower pin count but higher BOM cost and layout area | Chosen when output voltage flexibility across product variants justifies added design effort and component count. |
Compared with TPS62400DRVR and RT8059GJ6, the LTC3548EKD-1#TRPBF offers tighter factory-trimmed output accuracy (±1.8% vs ±2.5%), lower quiescent current (40μA vs 65μA), and integrated feedback dividers - reducing total solution size by 19% and simplifying qualification for high-volume portable designs.
Availability
LTC3548EKD-1#TRPBF is available at Aetrix Electronics and suitable for PDAs/palmtop PCs, digital cameras, cellular phones, wireless modems, and portable media players requiring stable component supply with guaranteed long-term manufacturability and consistent electrical performance.
Supply support for LTC3548EKD-1#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 LTC3548EKD-1#TRPBF belongs to Linear's µPower synchronous buck regulator family, designed specifically for space- and battery-constrained portable electronics where ultra-low IQ, fixed dual-rail generation, and minimal external components are mandatory.
FAQ
What is the maximum junction temperature specification for the LTC3548EKD-1#TRPBF?
The absolute maximum junction temperature for the LTC3548EKD-1#TRPBF is 125°C, with thermal shutdown activating near 150°C. Its UTDFN package has θJA = 43°C/W on a 4-layer PCB. At 800mA/400mA load with 3.6V input and 70°C ambient, calculated TJ is 83.6°C - well within safe operating range. Derating is recommended above 85°C ambient.
Does the LTC3548EKD-1#TRPBF require external feedback resistors to set its output voltages?
No, the LTC3548EKD-1#TRPBF does not require external feedback resistors. Its 1.8V and 1.575V outputs are factory-trimmed and internally generated using precision resistive dividers referenced to a 0.6V bandgap - VFB1 and VFB2 pins connect directly to VOUT1 and VOUT2, eliminating four external components and associated layout sensitivity.
How does Burst Mode® operation improve light-load efficiency in the LTC3548EKD-1#TRPBF?
Burst Mode® in the LTC3548EKD-1#TRPBF reduces switching losses by disabling the main control loop when output voltage reaches regulation, then pulsing the power switches only as needed to maintain VOUT. This cuts total quiescent current to 40μA and maintains >85% efficiency at 1mA load - critical for extending battery life in standby states of cellular phones and PDAs where the LTC3548EKD-1#TRPBF operates most frequently.
Can the LTC3548EKD-1#TRPBF operate with input voltage below 2.5V?
No, the LTC3548EKD-1#TRPBF has a specified minimum input voltage of 2.5V per Absolute Maximum Ratings and Electrical Characteristics tables. Below this, undervoltage lockout disables operation to prevent unstable regulation. While dropout mode supports 100% duty cycle down to VOUT + ILOAD•RDS(ON), the device will not start or sustain regulation if VIN falls below 2.5V - a hard limit enforced by internal UVLO circuitry.
What is the purpose of the exposed pad (Pin 11) on the LTC3548EKD-1#TRPBF UTDFN package?
The exposed pad (Pin 11) on the LTC3548EKD-1#TRPBF is electrically and thermally connected to GND. It must be soldered to a dedicated PCB ground plane using ≥4 thermal vias to achieve the specified θJA = 43°C/W and ensure reliable operation at full load. Leaving it unconnected degrades thermal performance by >25°C and risks premature thermal shutdown during sustained 800mA/400mA operation.
LTC3548EKD-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-UTDFN (3x3)
LTC3548EKD-1#TRPBF FAQ
1.How can I place an order for LTC3548EKD-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3548EKD-1#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 LTC3548EKD-1#TRPBF reliable?
The price and inventory of LTC3548EKD-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3548EKD-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3548EKD-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3548EKD-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3548EKD-1#TRPBF?
LTC3548EKD-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3548EKD-1#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 LTC3548EKD-1#TRPBF?
For technical support, including LTC3548EKD-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3548EKD-1#TRPBF requirements.
6.How does Aetrix verify that LTC3548EKD-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3548EKD-1#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 LTC3548EKD-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3548EKD-1#TRPBF?
All LTC3548EKD-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3548EKD-1#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 LTC3548EKD-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3548EKD-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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