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Analog Devices Inc. LTC3577EUFF#PBF
- Part No.:
- LTC3577EUFF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 44-PowerWFQFN
- Datasheet:
-
LTC3577EUFF#PBF.pdf
- Description:
- IC PWR MANAGEMENT HANDHELD 44QFN
- Quantity:
- Payment:
- Shipping:
Inventory:864
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Product details
Overview
LTC3577EUFF#PBF from Analog Devices (formerly Linear Technology) is a highly integrated 6-channel portable power management IC for single-cell Li-Ion/Polymer battery systems. It integrates a PowerPath™ manager with automatic load prioritization, a 1.5A battery charger with thermal limiting and high-temperature voltage reduction, three synchronous step-down regulators (800mA/500mA/500mA), dual 150mA LDOs, and an I²C-controlled LED backlight boost driver supporting up to 10 series LEDs - deployed in handheld media players and USB-powered industrial devices.
For engineers reviewing the LTC3577EUFF#PBF datasheet, LTC3577EUFF#PBF pinout, LTC3577EUFF#PBF application, or LTC3577EUFF#PBF equivalent, key selection considerations include its 44-pin QFN package, I²C-adjustable slew rates for EMI control, Bat-Track™ interface for external HV buck DC/DCs, and precise input current limiting (100/500/1000mA modes) enabling safe USB-compliant charging.
Technical Context
The LTC3577EUFF#PBF implements a hierarchical power sequencing architecture: PowerPath manages priority between VBUS, WALL, and battery sources while enforcing programmable input current limits via CLPROG and ILIM pins. Its triple buck regulators operate at 2.25MHz typical switching frequency with independent feedback (FB1/FB2/FB3) and support pulse-skipping or burst-mode operation for ultra-low quiescent current (17μA).
Charging is governed by PROG-resistor-set constant-current mode (up to 1.5A), temperature-compensated float voltage (4.20V ±21mV), and safety timer termination (4 hours). The I²C port controls LED dimming (60dB range, 64 steps), LDO enablement, regulator slew rates, and status readback - all coordinated through DVCC-supplied logic rails and synchronized pushbutton wake/reset sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery Float Voltage | 4.200V (LTC3577 variant); enables precise Li-Ion full-charge regulation without overvoltage stress |
| Max Charge Current | 1.5A with thermal limiting; supports fast charging from 5V USB or wall adapters while maintaining junction temperature ≤110°C |
| Step-Down Regulators | Three independent bucks: 800mA (Buck3), 500mA (Buck2), 500mA (Buck1); each with 0.8V feedback reference and 2.25MHz switching |
| LDO Outputs | Dual 150mA current-limited LDOs (LDO1/LDO2); adjustable via I²C; 0.78–0.82V FB reference ensures stable low-noise biasing |
| LED Boost Driver | Drives up to 10-series white LEDs; 60dB digital dimming via I²C; 20mA full-scale ILED_FS with 97% max duty cycle |
| Input Current Limit Modes | Programmable via ILIM0/ILIM1: 100mA (USB 1×), 500mA (USB 5×), 1000mA (10×); enforced using internal CLPROG servo loop |
| Package | 44-pin (4mm × 7mm × 0.75mm) QFN with exposed thermal pad; RoHS-compliant lead-free finish (PBF) |
Pinout & Package
The LTC3577EUFF#PBF is housed in a 44-pin plastic QFN package (4mm × 7mm, 0.75mm height) with exposed GND pad (Pin 45) requiring PCB soldering for thermal and electrical integrity. Pin numbering follows top-view layout with ILIM0 (Pin 1) at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ILIM0 / ILIM1 | Input Current Limit Configuration | Digital inputs selecting 100/500/1000mA VBUS current limit modes; pulled low/high to set scaling factor |
| PROG | Charge Current Programming | Analog input setting constant-current charge level via external resistor; 1000mA/mA ratio to IBAT |
| FB1 / FB2 / FB3 | Regulator Feedback Inputs | 0.8V reference points for Buck1/Buck2/Buck3 output voltage regulation; high-impedance (<0.05μA) sensing |
| LDO1_FB / LDO2_FB | LDO Feedback Inputs | 0.8V regulated reference inputs enabling precision output voltage setting for dual 150mA LDOs |
| SDA / SCL | I²C Interface | Standard bidirectional I²C bus (400kHz max) for configuring LED dimming, LDO enable, regulator slew, and status readback |
| ON / PWR_ON | Pushbutton Control Inputs | Debounced hardware inputs initiating system power-on, hard reset (5s hold), or wake-from-suspend sequencing |
| PG_DCDC | Power-Good Output | Open-drain signal asserting high when all three buck regulators are within ±8% of target output voltages |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ Load Prioritization | Automatically selects optimal source (VBUS/WALL/BAT) while preventing backfeed and enforcing input current limits |
| Bat-Track™ Interface | Provides analog tracking voltage (VC) to control external high-voltage buck converters for efficient HV-to-battery charging |
| I²C-Adjustable Slew Rates | Reduces EMI emissions by programming controlled edge rates on buck switch nodes via register writes |
| High-Temperature Battery Protection | Reduces float voltage at elevated temperatures (e.g., 4.20V → ~4.08V at 125°C) to improve long-term cell reliability |
| 6μA Hard Reset Drain | Minimizes battery depletion during deep sleep: only 6μA total drain with all supplies disabled and VBUS = 0V |
| Overvoltage Protection | Clamps VBUS/WALL inputs up to 30V transiently; uses OVGATE to drive external FET for >30V fault isolation |
Applications
| Portable Media Players | USB-Powered Industrial Handhelds |
|---|---|
|
Use Scenario: Battery-powered audio/video playback with multi-rail SoC, display backlight, and USB host connectivity. IC Role / Device Role / Timing Role: Central PMIC managing Li-Ion charging, SoC core/memory I/O rails (via bucks), display bias (LDOs), and LED backlight (boost). Use Value: Single-chip integration eliminates discrete power components; I²C dimming enables smooth UI transitions; PowerPath ensures uninterrupted playback during USB hot-plug. |
Use Scenario: Ruggedized field instruments requiring reliable operation from USB, wall adapter, or battery with minimal standby drain. IC Role / Device Role / Timing Role: System-level power arbiter coordinating source selection, sequenced rail enablement, and battery health monitoring (NTC). Use Value: 6μA hard-reset current extends shelf life; wall input detection (WALL pin) enables automatic adapter priority; thermal-foldback protects battery under high ambient conditions. |
| Digital/Satellite Radio Receivers | Medical Point-of-Care Devices |
|
Use Scenario: Compact DAB/DVB-H receivers needing low-noise analog rails, RF supply stability, and battery runtime optimization. IC Role / Device Role / Timing Role: Supplies clean 1.8V/3.3V for baseband processors and 5V for RF front-end; LDOs filter switching noise from buck outputs. Use Value: Dual LDOs provide <5μV/mA load regulation for sensitive analog circuits; burst-mode operation maintains efficiency at microamp loads. |
Use Scenario: Portable diagnostic tools (e.g., pulse oximeters) requiring FDA-grade reliability, low standby power, and battery safety compliance. IC Role / Device Role / Timing Role: Manages charging with temperature-compensated voltage, NTC-based cold/hot protection, and safety timer termination. Use Value: High-temperature voltage reduction prevents thermal runaway; 4.20V ±21mV float tolerance meets medical battery spec requirements; 110°C junction limit ensures robust thermal margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar portable PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3577EUFF-1#PBF | Fixed 4.100V battery float voltage (vs. 4.200V); identical pinout, features, and package | Suitable for cells requiring lower termination voltage to extend cycle life or reduce stress | Select LTC3577EUFF-1#PBF when battery chemistry mandates 4.1V float; otherwise use LTC3577EUFF#PBF for standard Li-Ion |
| MAX77818EWJ+T | Higher integration: includes fuel gauge, 3.2A charger, and dynamic voltage scaling; 48-pin WLP vs. 44-pin QFN | Targets higher-power applications (e.g., tablets) where fuel gauging and >1.5A charging are required | Choose MAX77818EWJ+T if system requires coulomb counting or faster charging; LTC3577EUFF#PBF offers better cost/performance for sub-1.5A USB-powered devices |
Compared with LTC3577EUFF-1#PBF, the LTC3577EUFF#PBF provides higher battery termination voltage for maximum capacity; versus MAX77818EWJ+T, it delivers lower BOM cost and smaller footprint for mid-tier portable designs without fuel gauging needs.
Availability
LTC3577EUFF#PBF is available at Aetrix Electronics and suitable for portable media players, USB-powered industrial handhelds, and medical point-of-care devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3577EUFF#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 acquired Linear Technology in 2017, inheriting its leadership in precision analog and power management ICs. Linear pioneered PowerPath and Bat-Track architectures now embedded across ADI's PMIC portfolio.
The LTC3577EUFF#PBF belongs to Linear's portable PMIC product line, designed specifically for space-constrained, battery-centric applications demanding multi-rail power control, intelligent charging, and seamless source arbitration - especially in USB-hosted consumer and industrial devices.
FAQ
What is the battery float voltage specification for the LTC3577EUFF#PBF?
The LTC3577EUFF#PBF has a nominal battery float voltage of 4.200V, with a guaranteed range of 4.179V to 4.221V at 25°C and 4.165V to 4.235V over –40°C to 85°C. This value is fixed for the LTC3577 variant and differs from the 4.100V float of the LTC3577-1 family member. The LTC3577EUFF#PBF uses this voltage to terminate constant-current charging and maintain battery health during saturation phase.
Does the LTC3577EUFF#PBF support USB 2.0-compliant current limiting?
Yes, the LTC3577EUFF#PBF supports USB 2.0-compliant current limiting via its programmable input current limit feature. Setting ILIM0 = ILIM1 = 0V configures the device for 100mA mode (USB low-power), while ILIM0 = ILIM1 = 5V selects 500mA mode (USB high-power). The CLPROG pin servo loop dynamically adjusts charge current to ensure total input current (load + charge) never exceeds the selected limit, satisfying USB specification requirements.
How does the PowerPath controller in the LTC3577EUFF#PBF manage source priority?
The PowerPath controller in the LTC3577EUFF#PBF automatically prioritizes power sources based on presence and capability: VBUS (USB) takes precedence when present and within specification, followed by WALL (wall adapter), with battery as backup. It prevents backflow between sources using internal ideal diode circuitry and enforces input current limits to avoid overloading upstream supplies. The LTC3577EUFF#PBF achieves seamless switchover without output disruption during source transitions.
Can the LTC3577EUFF#PBF drive 10-series white LEDs with analog dimming?
No, the LTC3577EUFF#PBF supports only digital dimming for its LED backlight boost driver - specifically 64-step PWM dimming controlled via I²C commands, delivering 60dB brightness range. It does not provide analog (current-based) dimming capability. The ILED_FS pin sets full-scale current (20mA typ), and dimming resolution is achieved through I²C register writes; no external analog control voltage interface exists for the LTC3577EUFF#PBF LED section.
What thermal protection mechanisms are implemented in the LTC3577EUFF#PBF?
The LTC3577EUFF#PBF implements multiple thermal protections: (1) junction temperature limiting at 110°C, triggering thermal shutdown; (2) battery charge current reduction above threshold temperatures via NTC monitoring; (3) high-temperature float voltage reduction (e.g., down to ~4.08V at 125°C) to mitigate cell stress; and (4) thermal foldback in the 1.5A charger to prevent sustained overheating. These functions are active without external components and are fully integrated into the LTC3577EUFF#PBF silicon design.
LTC3577EUFF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-PowerWFQFN
- 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:
- 44-QFN (4x7)
LTC3577EUFF#PBF FAQ
1.How can I place an order for LTC3577EUFF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3577EUFF#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 LTC3577EUFF#PBF reliable?
The price and inventory of LTC3577EUFF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3577EUFF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3577EUFF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3577EUFF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3577EUFF#PBF?
LTC3577EUFF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3577EUFF#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 LTC3577EUFF#PBF?
For technical support, including LTC3577EUFF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3577EUFF#PBF requirements.
6.How does Aetrix verify that LTC3577EUFF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3577EUFF#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 LTC3577EUFF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3577EUFF#PBF?
All LTC3577EUFF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3577EUFF#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 LTC3577EUFF#PBF part is unused and in its original packaging.
Return procedure for LTC3577EUFF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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