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Analog Devices Inc. LTC3566EUF#PBF
- Part No.:
- LTC3566EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3566EUF#PBF.pdf
- Description:
- IC USB POWER MANAGER 24-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:178
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Product details
Overview
LTC3566EUF#PBF from Analog Devices (formerly Linear Technology) is a highly integrated USB power manager IC with integrated 1A synchronous buck-boost DC/DC regulator, Li-ion battery charger, PowerPath™ controller, ideal diode, and always-on 3.3V/25mA LDO. It delivers up to 2.5W from USB 5V input, supports 100mA/500mA/1A programmable input current limits, regulates VOUT at BAT+300mV or fixed 3.6V during low-battery instant-on, and operates in –40°C to 85°C for handheld USB-powered devices.
For engineers reviewing the LTC3566EUF#PBF datasheet, LTC3566EUF#PBF pinout, LTC3566EUF#PBF application, or LTC3566EUF#PBF equivalent, key selection criteria include USB-compliant input current limiting, Bat-Track™ adaptive output control, thermal regulation at 110°C, 2.25MHz buck-boost switching frequency, and verified compatibility with single-cell Li-ion/polymer batteries in space-constrained portable systems.
Technical Context
The LTC3566EUF#PBF implements a dual-loop PowerPath™ architecture: a 2.25MHz constant-frequency step-down regulator controls VBUS-to-VOUT power delivery while dynamically prioritizing system load over battery charging, and a separate 1A buck-boost regulator (VIN1→VOUT1) operates independently via EN1 control. Input current limiting is enforced by analog servo of CLPROG pin voltage (1.188V threshold) with hCLPROG scaling factors of 224/1133/2140 mA/mA for 1x/5x/10x modes.
Its battery management includes CC/CV charging with 4.2V float voltage (±21mV), 1.5A max charge current (RPROG=5kΩ), trickle-charge enable below 2.85V BAT, and NTC-based thermal fault protection (75–78% VBUS cold, 33.4–36.4% VBUS hot). The internal ideal diode (180mΩ PMOS + 300mΩ NMOS) enables seamless switchover between VBUS and BAT, supporting <30μA no-load IQ from battery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (VBUS) | 4.35V to 5.5V - compliant with USB 2.0/3.0 host port specifications and 5V wall adapters. |
| Programmable Input Current Limit | 100mA / 500mA / 1A - selected via ILIM0/ILIM1 pins; ensures strict adherence to USB suspend/standard/high-power modes. |
| Buck-Boost Output (VOUT1) | 2.75V to 5.60V - adjustable via FB1 feedback; delivers up to 1A continuous at 3.3V with 2.25MHz PWM operation. |
| Battery Charge Voltage | 4.165V to 4.235V - tightly regulated float voltage enabling safe, full-capacity Li-ion charging with ±0.5% accuracy. |
| Quiescent Current (VBUS, Suspend) | 0.31–0.50mA - enables ultra-low-power USB suspend mode without compromising wake-up readiness. |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial-grade portable electronics including GPS, PMPs, and medical handhelds. |
| Package | 24-lead 4mm × 4mm QFN (UF) with exposed pad - optimized for thermal dissipation in compact PCB layouts. |
Pinout & Package
Package: 24-lead (4mm × 4mm) plastic QFN (UF) with exposed thermal pad (Pin 25 = GND). RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LDO3V3 (1) | Always-on regulated output | Provides 3.3V/25mA supply for RTC/watchdog; powered from VOUT; requires 1μF bypass capacitor. |
| CLPROG (2) | USB current limit programming & monitoring | Sets VBUS current limit via resistor-to-GND; senses average input current with 1.188V servo threshold. |
| NTC (3) | Battery temperature monitor input | Connects to thermistor network; disables charging if battery is outside 0°C–45°C range (75–78% VBUS cold, 33.4–36.4% VBUS hot). |
| FB1 (4) | Buck-boost feedback reference | Servos to 0.800V ±20mV; sets VOUT1 via external resistor divider; enables precise output voltage regulation. |
| VC1 (5) | Error amplifier compensation node | Accepts Type I or Type III compensation network; stabilizes buck-boost control loop across load/line variations. |
| GND (6,12,17,25) | Power and signal ground | Multiple dedicated GND pins reduce noise coupling; exposed pad (Pin 25) must be soldered to PCB ground plane. |
| SWAB1 (7) | Buck-boost switch node A/B | Connects to one end of external inductor; drives internal high-side PMOS and low-side NMOS switches. |
| MODE (8) | Burst Mode enable | High logic level activates Burst Mode for <13μA no-load IQ; improves light-load efficiency at expense of ripple. |
| VIN1 (9) | Buck-boost input supply | Typically tied to VOUT (Pin 20); accepts 2.7V–5.5V input; requires ≥1μF MLCC decoupling. |
| VOUT1 (10) | Buck-boost regulated output | Delivers up to 1A at user-configured voltage (e.g., 3.3V for logic rails); supports soft-start (0.5ms). |
| SWCD1 (11) | Buck-boost switch node C/D | Connects to other end of same inductor as SWAB1; completes buck-boost power stage topology. |
| ILIM0 / ILIM1 (13,14) | Input current limit select bits | Binary-encoded control (00=100mA, 01=500mA, 10=1A, 11=Suspend) with 1.6μA internal pull-down. |
| PROG (15) | Charge current programming & monitoring | Resistor-to-GND sets charge current (e.g., 1kΩ = ~1A); voltage reflects real-time IBAT (1V = 1A). |
| CHRG (16) | Open-drain charge status indicator | 35kHz modulated output signals charging/not charging/unresponsive battery/thermal fault; requires external pull-up. |
| GATE (18) | External ideal diode FET driver | Analog output controlling gate of external P-MOSFET; supplements internal ideal diode for lower forward drop. |
| BAT (19) | Li-ion battery terminal | Connects directly to single-cell battery; supports charging, discharging, and Bat-Track™ VOUT regulation. |
| VOUT (20) | PowerPath output / charger input | Main system rail (BAT+300mV or fixed 3.6V); powers load and battery charger; requires low-ESR ceramic bypass. |
| VBUS (21) | USB/wall adapter input | Primary 5V source; subjected to 7V transient rating; feeds PowerPath buck regulator and input current limiting loop. |
| SW (22) | PowerPath buck switch node | Drives external 3.3μH inductor to VOUT; implements 2.25MHz step-down conversion from VBUS. |
| CHRGEN (23) | Charger enable (active low) | Independent digital control of battery charger; pulled down internally; allows software-controlled charge disable. |
| EN1 (24) | Buck-boost enable (active high) | Independent digital control of buck-boost regulator; pulled down internally; enables dynamic power rail management. |
Key Features
| Feature | Design Value |
|---|---|
| USB-compliant input current limiting | Hardware-enforced 100mA/500mA/1A limits via CLPROG servo and ILIM0/ILIM1 pins - eliminates firmware dependency for USB compliance. |
| Bat-Track™ adaptive VOUT regulation | Maintains VOUT = BAT + 300mV during normal operation - minimizes linear charger dropout loss and maximizes system efficiency. |
| Instant-On low-battery operation | Regulates VOUT at fixed 3.6V when BAT < 3.3V - enables immediate device boot even with deeply discharged battery. |
| Thermal regulation with shutdown | Reduces charge current above 110°C junction temperature - prevents thermal runaway without full system reset. |
| Zero shutdown current | 0μA IQ in shutdown state (EN1 = low, CHRGEN = high) - preserves battery life during long-term storage. |
| Integrated ideal diode with external FET support | 180mΩ internal PMOS + gate driver for external P-MOSFET - achieves <20mV forward drop under 1A load for minimal power loss. |
Applications
| HDD-Based MP3 Players | PDA & GPS Navigation Devices |
|---|---|
|
Use Scenario: Portable music player with mechanical hard disk drive requiring stable 3.3V rail and fast battery charging from USB. IC Role / Device Role / Timing Role: LTC3566EUF#PBF manages USB 500mA input, powers HDD motor and audio codec from VOUT1, charges Li-ion battery while maintaining VOUT at BAT+300mV. Use Value: Delivers >2.5W usable power from USB port, enabling simultaneous HDD spin-up and full-rate charging without violating USB current limits. |
Use Scenario: Handheld GPS unit operating from USB bus power or single-cell Li-ion battery with thermal constraints. IC Role / Device Role / Timing Role: LTC3566EUF#PBF provides 3.3V always-on LDO for GPS baseband processor, regulates VOUT for RF front-end, and enforces NTC-based thermal charging limits. Use Value: Ensures reliable GPS lock during cold weather (via NTC cold-fault hysteresis) and prevents overheating during extended navigation sessions. |
| USB-Powered Portable Medical Monitors | Industrial Handheld Scanners |
|
Use Scenario: Battery-backed vital sign monitor that must operate continuously when connected to USB host for data upload. IC Role / Device Role / Timing Role: LTC3566EUF#PBF supplies 3.3V to microcontroller and sensors from VOUT, charges battery at 1A via PROG pin, and maintains VOUT at 3.6V during low-BAT instant-on. Use Value: Guarantees uninterrupted sensor acquisition during USB data transfer, even if battery is depleted below 3.0V. |
Use Scenario: Rugged barcode scanner used in warehouses with intermittent USB charging and demanding peak current loads. IC Role / Device Role / Timing Role: LTC3566EUF#PBF powers laser diode driver and decode ASIC from VOUT1, uses PowerPath to prioritize scanner load over charging, and enables burst-mode IQ reduction during idle. Use Value: Supports 1A pulsed laser current without brownout, while extending battery runtime via 13μA burst-mode quiescent current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3566EUF-2#PBF | Includes automatic VOUT regulation at 3.6V during low-battery conditions; LTC3566EUF#PBF does not regulate VOUT at fixed 3.6V when BAT < 3.3V. | Suitable for designs requiring guaranteed instant-on from deeply discharged batteries without firmware intervention. | Select LTC3566EUF-2#PBF only if fixed 3.6V low-BAT regulation is required; otherwise LTC3566EUF#PBF offers identical functionality at lower cost. |
| MAX14744ETA+T | Single-chip USB power manager with 1.2A charger and 3.3V/200mA LDO; lacks integrated buck-boost regulator and external ideal diode control. | Requires external DC/DC for non-3.3V rails; better suited for simpler systems where VOUT1 is not needed. | Choose MAX14744ETA+T for cost-sensitive, low-complexity USB chargers without auxiliary power rail requirements. |
Compared with LTC3566EUF-2#PBF, the LTC3566EUF#PBF omits automatic 3.6V low-BAT regulation but retains identical PowerPath, charger, and buck-boost performance; versus MAX14744ETA+T, it provides greater integration with on-chip 1A buck-boost and ideal diode FET control - critical for multi-rail portable systems.
Availability
LTC3566EUF#PBF is available at Aetrix Electronics and suitable for HDD-based MP3 players, PDA & GPS navigation devices, USB-powered portable medical monitors, and industrial handheld scanners requiring stable component supply, industrial temperature operation, and USB-compliant power management.
Supply support for LTC3566EUF#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 digital signal processing semiconductors.
The LTC3566EUF#PBF belongs to Linear's PowerPath™ family of USB-aware power managers, designed specifically for space-constrained, battery-backed portable electronics requiring intelligent power arbitration between USB input, system load, and Li-ion charging.
FAQ
What is the maximum continuous output current of the buck-boost regulator in LTC3566EUF#PBF?
The LTC3566EUF#PBF buck-boost regulator delivers up to 1A continuous output current at 3.3V under typical conditions (VIN1 = 3.6V, TA = 25°C). Peak current capability reaches 2.5A in PWM mode, and the regulator includes overcurrent protection with 2A/3A peak limits depending on operating mode. Derating applies at elevated temperatures or with poor PCB thermal design.
How does LTC3566EUF#PBF enforce USB current compliance during battery charging?
The LTC3566EUF#PBF enforces USB current compliance through hardware-based current limiting: the CLPROG pin servo loop monitors average VBUS current and throttles the PowerPath buck regulator before exceeding programmed limits (100mA/500mA/1A). The battery charger dynamically reduces charge current to ensure total input current never violates USB specifications - no firmware or host intervention required.
Can LTC3566EUF#PBF operate with a missing or disconnected battery?
Yes, the LTC3566EUF#PBF supports battery-absent operation: when BAT is open, VOUT regulates at 4.5V (or 300mV above 4.2V float voltage) in USB-powered mode, enabling instant-on functionality. The ideal diode path is disabled, and all power is delivered from VBUS to VOUT and VOUT1. CHRG pin indicates "unresponsive battery" state, and charging functions are inhibited.
What is the purpose of the GATE pin on LTC3566EUF#PBF?
On the LTC3566EUF#PBF, the GATE pin drives the gate of an external P-channel MOSFET connected between VOUT and BAT, supplementing the internal ideal diode. This reduces forward voltage drop and conduction loss - especially critical at high load currents (>500mA) - improving overall system efficiency and thermal performance beyond what the internal 180mΩ PMOS can achieve alone.
Does LTC3566EUF#PBF support thermal regulation during battery charging?
Yes, the LTC3566EUF#PBF includes integrated thermal regulation: when junction temperature exceeds 110°C, the battery charger automatically reduces charge current to prevent thermal runaway. This analog, hardware-based response operates independently of firmware and remains active across all operating modes, ensuring safe charging in enclosed or high-ambient-temperature environments.
LTC3566EUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Handheld/Mobile Devices
- Current - Supply:
- -
- Voltage - Supply:
- 4.35V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3566EUF#PBF FAQ
1.How can I place an order for LTC3566EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3566EUF#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 LTC3566EUF#PBF reliable?
The price and inventory of LTC3566EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3566EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3566EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3566EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3566EUF#PBF?
LTC3566EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3566EUF#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 LTC3566EUF#PBF?
For technical support, including LTC3566EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3566EUF#PBF requirements.
6.How does Aetrix verify that LTC3566EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3566EUF#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 LTC3566EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3566EUF#PBF?
All LTC3566EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3566EUF#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 LTC3566EUF#PBF part is unused and in its original packaging.
Return procedure for LTC3566EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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