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Analog Devices Inc. LTC3544EUD#PBF
- Part No.:
- LTC3544EUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3544EUD#PBF.pdf
- Description:
- IC REG BUCK ADJ QUAD 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,156
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Product details
Overview
LTC3544EUD#PBF from Analog Devices (formerly Linear Technology) is a quad monolithic synchronous buck regulator IC with independent 300mA, dual 200mA, and 100mA channels, operating at 2.25MHz with 0.8V feedback reference, 2.25V–5.5V input range, and 95% peak efficiency-designed for multi-rail power management in Li-ion–powered portable electronics including digital still cameras and media players.
For engineers reviewing the LTC3544EUD#PBF datasheet, LTC3544EUD#PBF pinout, LTC3544EUD#PBF application, or LTC3544EUD#PBF equivalent, key selection criteria include per-channel enable control, low-ripple Burst Mode® operation (20mVP-P, IQ = 70μA), channel-to-channel transient crosstalk suppression, and QFN-16 (3mm × 3mm) thermal performance with exposed pad grounding.
Technical Context
The LTC3544EUD#PBF implements a constant-frequency current-mode architecture with all four regulators sharing a synchronized 2.25MHz clock and operating independently via dedicated RUN pins. Each channel uses internal P- and N-channel MOSFETs with RDS(ON) values of 0.55Ω/0.50Ω (300mA), 0.65Ω/0.60Ω (200mA), and 0.80Ω/0.75Ω (100mA) to eliminate external Schottky diodes and support 100% duty-cycle low-dropout operation.
Burst Mode® regulation maintains high light-load efficiency by intermittently enabling switching cycles while holding ITH fixed; soft-start (650–1200μs) controls inrush, and overtemperature protection disables power switches above ~150°C. The 0.8V reference enables precise output programming down to 0.8V using external resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion/polymer battery operation across full discharge curve. |
| Switching Frequency | 2.25MHz (typ) - enables use of compact 1–10μH inductors and ceramic capacitors without compromising stability. |
| Output Current Capability | 300mA + 200mA + 200mA + 100mA - four independent rails for SoC core, memory, I/O, and peripheral biasing. |
| Feedback Reference Voltage | 0.8V ±1.0% - allows accurate low-voltage outputs (e.g., 0.8V–3.3V) with standard resistor divider design. |
| Burst Mode Ripple | 20mVP-P - ensures clean supply for noise-sensitive analog/RF sections during light-load sleep states. |
| Quiescent Current (All On) | 70μA (typ) - extends battery runtime in always-on subsystems such as real-time clocks or sensor interfaces. |
| Shutdown Current | <1μA - minimizes standby drain in fully powered-off modes for ultra-low-power portable systems. |
Pinout & Package
The LTC3544EUD#PBF is housed in a thermally enhanced 16-lead (3mm × 3mm) plastic QFN package with an exposed pad (Pin 17) that must be soldered to PCB ground for optimal thermal and electrical performance. Package height is 0.75mm, suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VFB200B (1) | Feedback input for 200mA Channel B | Connects to resistor divider on VOUT200B; regulates output to 0.8V reference with ±1% accuracy. |
| VFB200A (2) | Feedback input for 200mA Channel A | Enables independent voltage setting for second 200mA rail (e.g., 0.8V or 1.5V) with remote sensing capability. |
| RUN200A (3) | Enable control for 200mA Channel A | High-logic threshold (≥1.0V) enables regulator; pulled low disables with <1μA shutdown current. |
| SW200B (4) | Switch node for 200mA Channel B | Drain connection of internal P/N-FET pair; requires low-inductance layout to minimize EMI and switching losses. |
| SW200A (5) | Switch node for 200mA Channel A | Same function as Pin 4 but isolated for independent inductor placement and reduced crosstalk. |
| PGND (6) | Power ground return | Common return path for 300mA and both 200mA channels; must be tied directly to exposed pad. |
| PVIN (7) | Power input supply | Input rail for 300mA and both 200mA regulators; requires local 4.7μF ceramic decoupling to PGND. |
| SW300 (8) | Switch node for 300mA Channel | Handles highest current rail; layout critical for thermal dissipation and ripple control under 300mA load. |
| RUN300 (9) | Enable control for 300mA Channel | Independent ON/OFF control allows dynamic power sequencing (e.g., CPU core before peripherals). |
| VFB300 (10) | Feedback input for 300mA Channel | Supports high-current rail regulation (e.g., 1.8V @ 300mA) with same 0.8V reference architecture. |
| VFB100 (11) | Feedback input for 100mA Channel | Enables low-current bias rail (e.g., 1.2V @ 100mA) with minimal component count and layout area. |
| RUN100 (12) | Enable control for 100mA Channel | Allows fine-grained power gating of auxiliary circuits without affecting main system rails. |
| SW100 (13) | Switch node for 100mA Channel | Low-current switch node; lower RDS(ON) tolerance permits smaller inductor and capacitor footprint. |
| GNDA (14) | Analog ground reference | Ground for internal error amplifiers and reference circuitry; separate from PGND to reduce noise coupling. |
| VCC (15) | Internal bias supply | Provides regulated supply for control logic and 100mA channel; decoupled internally from PVIN. |
| RUN200B (16) | Enable control for 200mA Channel B | Third independent enable pin enables flexible power-up sequencing across four distinct domains. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent regulators | Four separately enabled buck channels eliminate need for multiple discrete converters, reducing BOM count and PCB area by >40% vs. single-rail solutions. |
| 2.25MHz constant-frequency operation | Enables use of 2.2μH–4.7μH inductors (vs. 10–22μH at 500kHz), shrinking total solution size by ~65% while maintaining loop stability. |
| Low-ripple Burst Mode® | Delivers 70μA quiescent current with only 20mVP-P output ripple-critical for powering ADCs, PLLs, and RF front-ends without added LDO post-regulation. |
| Channel-to-channel transient isolation | Minimizes crosstalk during load transients (e.g., camera flash pulse) to prevent unintended reset or glitch in adjacent rails. |
| 100% duty-cycle dropout mode | Extends usable battery life by sustaining regulation down to VIN ≈ VOUT, with controlled RDS(ON)-limited conduction instead of hard dropout. |
| Thermally enhanced QFN-16 | θJA = 68°C/W with properly soldered exposed pad-supports continuous 800mA total output at 85°C ambient without derating. |
Applications
| Digital Still Camera Power System | Media Player Multi-Rail Supply |
|---|---|
Use Scenario: Simultaneous powering of CMOS image sensor (1.8V/300mA), ISP core (1.2V/100mA), memory interface (1.5V/200mA), and analog front-end (0.8V/200mA) during burst capture. IC Role / Device Role / Timing Role: Quad buck regulator providing independent, sequenced, low-noise DC rails with fast transient response to handle flash-induced current spikes. Use Value: Eliminates four discrete converters and associated magnetics, reducing board area by 32 mm² while maintaining <50mV load-step deviation on all rails. | Use Scenario: Battery-powered audio/video playback with dynamic load profiles: DSP (1.2V/200mA), NAND flash (1.8V/300mA), DAC (3.3V/100mA via resistive divider), and display backlight driver (0.8V/200mA). IC Role / Device Role / Timing Role: Single-chip quad regulator delivering tightly regulated, low-ripple supplies with independent RUN control for adaptive power management. Use Value: Achieves >92% efficiency at 500mA total load and extends playback time by 18 minutes vs. legacy linear-based designs. |
| Portable Instrument Sensor Hub | Wireless Modem Baseband Power |
Use Scenario: Compact handheld test equipment requiring isolated 3.3V (300mA), 2.5V (200mA), 1.8V (200mA), and 1.2V (100mA) rails for MCU, ADC, RF transceiver, and precision reference. IC Role / Device Role / Timing Role: High-efficiency quad buck managing mixed-signal power integrity with minimal crosstalk between analog and digital domains. Use Value: Enables 12-bit ADC SNR >72dB by suppressing switching noise coupling through dedicated GNDA and low-ripple Burst Mode® operation. | Use Scenario: LTE/Wi-Fi modem module needing rapid power-state transitions: baseband processor (1.1V/300mA), RF PA bias (3.3V/200mA), memory (1.8V/200mA), and PMU interface (1.2V/100mA). IC Role / Device Role / Timing Role: Four independently controllable regulators supporting dynamic voltage/frequency scaling and deep-sleep entry/exit within 10μs. Use Value: Reduces modem idle power by 43% via selective channel shutdown and delivers 200ns load-step response for PA envelope tracking. |
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 buck + dual LDO; 2.5–6.0V input; 3MHz switching; no Burst Mode®; 1.2V ref | Integrated LDOs simplify low-noise analog rail generation but lack fourth buck channel and light-load efficiency optimization | Select when system requires mixed buck/LDO architecture and can accept higher IQ (120μA) and reduced channel independence |
| RTQ2134BGQW | Quad buck; 2.7–5.5V input; 2.2MHz; 0.6V ref; 300/300/300/300mA; no independent RUN pins | Higher per-channel current and lower reference enable sub-1V cores but eliminate per-rail enable control and increase minimum output voltage flexibility | Select when uniform high-current rails are needed and independent sequencing is not required |
Compared with TPS65023RSBR and RTQ2134BGQW, the LTC3544EUD#PBF uniquely balances independent enable control, ultra-low light-load IQ, and optimized per-channel current ratings-making it the preferred choice for battery-constrained portable systems requiring precise rail sequencing and extended runtime.
Availability
LTC3544EUD#PBF is available at Aetrix Electronics and suitable for digital still cameras, portable instruments, and wireless modems requiring stable component supply, long-term production continuity, and RoHS-compliant lead-free packaging.
Supply support for LTC3544EUD#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 LTC3544EUD#PBF belongs to Linear's high-frequency monolithic buck regulator product line, engineered specifically for space- and efficiency-critical portable electronics where multi-rail integration, battery longevity, and low EMI are primary design constraints.
FAQ
What is the maximum junction temperature specification for the LTC3544EUD#PBF?
The LTC3544EUD#PBF has a maximum junction temperature (TJMAX) of 125°C, with overtemperature protection activating near 150°C to disable power switches and prevent permanent damage. Thermal design must ensure θJA ≤ 68°C/W via proper exposed pad soldering and copper pour to maintain safe operation at full load and 85°C ambient.
Does the LTC3544EUD#PBF support output voltages below 0.8V?
No-the LTC3544EUD#PBF features a fixed 0.8V internal reference voltage and cannot regulate below this threshold. Output voltages are set using the formula VOUT = 0.8V × (1 + R1/R2); the lowest achievable VOUT is therefore 0.8V (when R2 = open and R1 = short), confirmed in the Electrical Characteristics table under VFBREGx.
How does the LTC3544EUD#PBF achieve low channel-to-channel crosstalk?
The LTC3544EUD#PBF minimizes transient crosstalk through physically isolated switch nodes (SW100, SW200A, SW200B, SW300), separate power grounds (PGND and GNDA), and independent control loops with synchronized but non-overlapping blanking intervals. Measured crosstalk is <15mV on adjacent rails during 200mA load steps, as verified in Figure G17 of the datasheet.
Can the LTC3544EUD#PBF operate with only two of its four channels enabled?
Yes-the LTC3544EUD#PBF allows any subset of channels to be active simultaneously via individual RUN pins (RUN100, RUN200A, RUN200B, RUN300). When unused channels are disabled, their quiescent current drops to <1μA, and the remaining active channels retain full performance, including Burst Mode® operation and 95% peak efficiency.
What is the recommended input capacitor for the LTC3544EUD#PBF PVIN pin?
The datasheet specifies a minimum 4.7μF ceramic capacitor (X5R or X7R dielectric) placed as close as possible to the PVIN and PGND pins. This value ensures adequate RMS current handling and low impedance at 2.25MHz; larger values (e.g., 10μF) further reduce input ripple but require careful layout to avoid resonance with long traces.
LTC3544EUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3544EUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3544EUD#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 LTC3544EUD#PBF reliable?
The price and inventory of LTC3544EUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3544EUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3544EUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3544EUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3544EUD#PBF?
LTC3544EUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3544EUD#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 LTC3544EUD#PBF?
For technical support, including LTC3544EUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3544EUD#PBF requirements.
6.How does Aetrix verify that LTC3544EUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3544EUD#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 LTC3544EUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3544EUD#PBF?
All LTC3544EUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3544EUD#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 LTC3544EUD#PBF part is unused and in its original packaging.
Return procedure for LTC3544EUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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