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Analog Devices Inc. LTC3544EUD#TRPBF
- Part No.:
- LTC3544EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3544EUD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,095
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Product details
Overview
LTC3544EUD#TRPBF from Analog Devices (formerly Linear Technology) is a quad monolithic synchronous step-down DC/DC regulator IC with independent 300mA, 200mA, 200mA, and 100mA channels, operating at 2.25MHz constant frequency, supporting 2.25V–5.5V input for single Li-ion/polymer battery systems in portable media players and digital still cameras.
For engineers reviewing the LTC3544EUD#TRPBF datasheet, LTC3544EUD#TRPBF pinout, LTC3544EUD#TRPBF application, or LTC3544EUD#TRPBF equivalent, key selection criteria include channel independence, 0.8V feedback reference enabling sub-1.2V outputs, Burst Mode® operation delivering 20mVP-P ripple with 70μA quiescent current (all channels active), and 16-lead 3mm × 3mm QFN package with exposed thermal pad.
Technical Context
The LTC3544EUD#TRPBF uses a constant-frequency current-mode control architecture with all four regulators sharing a synchronized 2.25MHz clock and operating in-phase. Each channel features independent RUN pins, internal P-channel and N-channel synchronous MOSFETs, and a precision 0.8V feedback reference.
It implements low-ripple Burst Mode® operation below ~10% load to minimize switching losses, achieves 100% duty-cycle dropout operation for extended battery runtime, and integrates overtemperature protection with junction shutdown at ~150°C. Channel-to-channel transient crosstalk is minimized via separate power paths and dedicated ground pins (PGND and GNDA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports direct connection to single-cell Li-ion/polymer batteries across full discharge curve. |
| Switching Frequency | 2.25MHz (typ) - enables use of compact 1–10μH surface-mount inductors and ceramic capacitors. |
| Output Current per Channel | 300mA / 200mA / 200mA / 100mA - independent regulation with separate RUN controls and dedicated switch nodes. |
| Feedback Reference Voltage | 0.8V ±1.0% - allows precise programming of output voltages down to 0.8V using external resistor dividers. |
| Burst Mode Quiescent Current | 70μA (all channels active) - extends battery life in standby or light-load states without sacrificing regulation accuracy. |
| Peak Efficiency | 95% - achieved at medium loads due to synchronous rectification and low RDS(ON) P/N-FETs (0.55Ω/0.50Ω for 300mA channel). |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial and portable consumer environments with thermal shutdown at ~150°C. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with 0.75mm profile and exposed thermal pad (Pin 17, GND), RoHS-compliant lead-free finish, tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB200B (1) | Feedback input for 200mA Channel B | Connects to resistive divider on VOUT200B; regulates output by comparing to 0.8V internal reference. |
| VFB200A (2) | Feedback input for 200mA Channel A | Independent feedback path enabling precise voltage setting for second 200mA rail (e.g., 0.8V core supply). |
| RUN200A (3) | Enable control for 200mA Channel A | Logic-high (>1.0V) enables regulator; logic-low (<0.3V) forces shutdown drawing <1μA total supply current. |
| SW200B (4) | Switch node for 200mA Channel B | Drain connection of internal P/N-MOSFET pair; requires external inductor and ceramic capacitor to ground. |
| SW200A (5) | Switch node for 200mA Channel A | Dedicated high-frequency switching node-separate from other channels to prevent coupling and ensure stability. |
| PGND (6) | Power ground return | Common return for 300mA and both 200mA channels; must be low-inductance connection to PCB ground plane. |
| PVIN (7) | Power input supply | Input supply for 300mA and both 200mA regulators; requires local 4.7μF+ ceramic decoupling to PGND. |
| SW300 (8) | Switch node for 300mA Channel | High-current switch node (up to 600mA peak); routed separately to minimize EMI and thermal coupling. |
| RUN300 (9) | Enable control for 300mA Channel | Independent enable allows sequencing-e.g., powering main processor rail after auxiliary supplies are stable. |
| VFB300 (10) | Feedback input for 300mA Channel | Supports high-current rails (e.g., 1.8V I/O); tolerates ±0.1V line/load regulation error over full input range. |
| VFB100 (11) | Feedback input for 100mA Channel | Enables low-noise analog or sensor supply (e.g., 1.2V) with minimal interaction due to GNDA isolation. |
| RUN100 (12) | Enable control for 100mA Channel | Allows independent power gating of low-current peripherals without affecting other regulators. |
| SW100 (13) | Switch node for 100mA Channel | Optimized for low-RDS(ON) (0.80Ω P-FET) and light-load efficiency; routed away from noisy digital sections. |
| GNDA (14) | Analog/control ground | Separate ground for 100mA channel and internal reference circuitry-reduces noise coupling into sensitive feedback paths. |
| VCC (15) | Internal bias supply | Provides regulated supply for control logic and error amplifiers; powered from PVIN but isolated for stability. |
| RUN200B (16) | Enable control for 200mA Channel B | Third independent enable pin-supports flexible power sequencing across four distinct voltage domains. |
| Exposed Pad (17) | Thermal & electrical ground | Must be soldered to PCB thermal pad for junction-to-board thermal resistance (θJA = 68°C/W) and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent synchronous buck regulators | Four fully isolated DC/DC channels with separate RUN, SW, VFB, and ground connections-enables multi-rail power sequencing without external logic. |
| 2.25MHz fixed-frequency operation | Eliminates external frequency-setting components and allows consistent EMI filtering; supports ultra-small 1–10μH inductors and low-ESR ceramic caps. |
| Low-ripple Burst Mode® | Maintains tight output regulation (±1%) while reducing quiescent current to 70μA and limiting output ripple to 20mVP-P at light loads. |
| 0.8V precision feedback reference | Enables accurate generation of sub-1.2V outputs (e.g., 0.8V, 1.0V) critical for modern low-voltage processors and FPGAs using standard resistor dividers. |
| 100% duty-cycle dropout mode | Extends usable battery life by maintaining regulation down to VIN ≈ VOUT, with only P-FET RDS(ON) and inductor DCR determining minimum dropout voltage. |
| Channel-to-channel transient isolation | Minimizes crosstalk during load transients-e.g., a 300mA step on VOUT300 induces <0.5% disturbance on VOUT100 due to separate power/ground paths and layout-aware pinout. |
Applications
| Digital Still Camera Power System | Portable Media Player SoC Supply |
|---|---|
Use Scenario: Simultaneous powering of image sensor (1.8V/300mA), ISP core (0.8V/200mA), memory interface (1.5V/200mA), and audio codec (1.2V/100mA) from single Li-ion cell. IC Role / Device Role / Timing Role: Quad-output PMIC providing independently sequenced, low-noise, high-efficiency DC rails with fast transient response to burst capture events. Use Value: Eliminates need for four discrete buck converters-reducing board area by >40%, component count by 12+, and system-level EMI through synchronized 2.25MHz switching. | Use Scenario: Powering application processor (1.2V/200mA), GPU (0.9V/200mA), DDR memory (1.8V/300mA), and audio subsystem (3.3V via LDO fed from 300mA rail) in handheld video player. IC Role / Device Role / Timing Role: Primary multi-rail DC/DC controller with programmable enable timing to meet SoC power-up sequence requirements (e.g., core before I/O). Use Value: Achieves >92% efficiency at 500mA total load while maintaining <20mV ripple on all rails-extending playback time by 18 minutes per charge vs. linear regulators. |
| Wireless DSL Modem Baseband | Personal Information Appliance MCU System |
Use Scenario: Generating 1.8V/300mA for baseband ASIC, 1.2V/100mA for RF transceiver bias, 0.8V/200mA for DSP core, and 1.5V/200mA for USB PHY in compact broadband modem. IC Role / Device Role / Timing Role: Integrated power management IC delivering tightly regulated, low-crosstalk supplies for mixed-signal baseband processing under dynamic traffic loads. Use Value: Reduces conducted emissions by 12dB compared to discrete solutions due to phase-aligned switching and optimized pinout-simplifying FCC/CE compliance testing. | Use Scenario: Powering ARM Cortex-M7 MCU (1.2V/200mA), touch controller (3.3V via LDO), display driver (1.8V/300mA), and BLE radio (1.1V/100mA) in smart organizer device. IC Role / Device Role / Timing Role: Single-chip quad buck regulator enabling independent sleep/wake control per subsystem to minimize system-wide quiescent current. Use Value: Enables <1.5μA system deep-sleep current (via individual RUN pin control) while retaining fast wake-up (<100μs) from any interrupt source. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | Triple 0.6A/0.6A/0.3A buck + dual LDO; 2.5–5.5V input; 2.25MHz switching; no Burst Mode; higher IQ (120μA) | Integrated LDOs simplify analog rail generation but lack fourth buck channel; less suitable for 4-rail digital systems | Select when needing integrated LDOs and lower channel count; avoid when requiring four independent high-efficiency bucks. |
| ISL9305IRTNZ-T | Quad 0.6A/0.6A/0.3A/0.3A buck; 2.5–5.5V input; 3MHz switching; 25μA IQ (all on); no 100% dropout | Higher switching frequency enables smaller passives but reduced dropout capability limits low-VIN operation | Select for space-constrained designs prioritizing ultra-low IQ and smallest possible inductors; avoid for Li-ion systems requiring full 2.25V–5.5V range support. |
Compared with TPS65023RSBR and ISL9305IRTNZ-T, the LTC3544EUD#TRPBF uniquely delivers four independent synchronous bucks with true 100% duty-cycle operation, 0.8V reference, and Burst Mode®-making it optimal for battery-powered systems demanding maximum runtime, minimal ripple, and flexible multi-rail sequencing.
Availability
LTC3544EUD#TRPBF is available at Aetrix Electronics and suitable for digital still cameras, portable media players, wireless DSL modems, and personal information appliances requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC3544EUD#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio with rigorous qualification standards and long-term product roadmaps.
The LTC3544EUD#TRPBF belongs to Linear's high-efficiency monolithic DC/DC regulator family, designed specifically for space-constrained, battery-operated portable electronics requiring multiple low-noise, independently controlled power rails.
FAQ
What is the maximum output current capability of each channel on the LTC3544EUD#TRPBF?
The LTC3544EUD#TRPBF provides four independent output channels with rated currents of 300mA (SW300), 200mA (SW200A), 200mA (SW200B), and 100mA (SW100). Peak switch current limits are 600mA, 400mA, 400mA, and 200mA respectively. These values are validated across –40°C to +85°C and reflect DC capability-not pulsed or short-term surge ratings. The LTC3544EUD#TRPBF datasheet specifies RDS(ON) and thermal derating curves to ensure reliable operation at full rated load.
Does the LTC3544EUD#TRPBF support output voltages below 1.0V?
Yes, the LTC3544EUD#TRPBF supports output voltages as low as 0.8V due to its precision 0.8V internal feedback reference. Using an external resistor divider (e.g., R1 = 100kΩ, R2 = 100kΩ), users can set VOUT = 0.8V × (1 + R1/R2) = 1.6V; to achieve 0.9V, use R1 = 12.5kΩ and R2 = 100kΩ. The LTC3544EUD#TRPBF maintains ±1% regulation accuracy across line, load, and temperature for outputs ≥0.8V, confirmed in the Electrical Characteristics table.
How does Burst Mode® operation affect output ripple and efficiency on the LTC3544EUD#TRPBF?
Burst Mode® on the LTC3544EUD#TRPBF reduces quiescent current to 70μA (all channels active) while limiting output ripple to 20mVP-P-measured under light-load conditions (e.g., 10mA per channel). Efficiency rises sharply below 10% load versus continuous mode, reaching >85% at 1mA load on the 300mA channel (VIN = 3.6V, VOUT = 1.8V). This behavior is intrinsic to the LTC3544EUD#TRPBF architecture and requires no external configuration.
Can the LTC3544EUD#TRPBF operate with a 2.25V input supply?
Yes, the LTC3544EUD#TRPBF is fully specified from 2.25V to 5.5V input. At 2.25V, it supports 100% duty-cycle operation for outputs ≤2.25V (e.g., 1.8V, 1.5V, 1.2V, 0.8V), maintaining regulation until VIN drops below VOUT + (ILOAD × RDS(ON)). The LTC3544EUD#TRPBF datasheet confirms undervoltage lockout release at 2.25V (min) and validates performance down to this rail in Typical Performance Characteristics graphs.
What thermal design considerations apply to the LTC3544EUD#TRPBF in high-ambient environments?
The LTC3544EUD#TRPBF uses a 3mm × 3mm QFN package with θJA = 68°C/W. To maintain TJ < 125°C at +85°C ambient, total power dissipation must stay below 147mW (calculated as (125–85)/68). At full 800mA load (300+200+200+100), measured dissipation is ~138mW-well within limit-provided the exposed pad (Pin 17) is soldered to ≥1cm² copper area. The LTC3544EUD#TRPBF integrates overtemperature protection that disables switches if junction exceeds ~150°C.
LTC3544EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 4
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 100mA, 200mA(2), 300mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3544EUD#TRPBF FAQ
1.How can I place an order for LTC3544EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3544EUD#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 LTC3544EUD#TRPBF reliable?
The price and inventory of LTC3544EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3544EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3544EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3544EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3544EUD#TRPBF?
LTC3544EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3544EUD#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 LTC3544EUD#TRPBF?
For technical support, including LTC3544EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3544EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3544EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3544EUD#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 LTC3544EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3544EUD#TRPBF?
All LTC3544EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3544EUD#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 LTC3544EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3544EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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