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Analog Devices Inc. LTC4055EUF#TRPBF
- Part No.:
- LTC4055EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC4055EUF#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,567
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Product details
Overview
LTC4055EUF#TRPBF from Analog Devices (formerly Linear Technology) is a USB power manager and single-cell Li-ion battery charger IC with integrated PowerPath™ control. It delivers 500mA/100mA selectable input current limit, 4.2V ±0.8% float voltage, and thermal-regulated constant-current/constant-voltage charging - enabling safe, compliant USB-powered portable devices like MP3 players and PDAs.
For engineers reviewing the LTC4055EUF#TRPBF datasheet, LTC4055EUF#TRPBF pinout, LTC4055EUF#TRPBF application, or LTC4055EUF#TRPBF equivalent, key selection criteria include USB suspend compliance, NTC thermistor-based temperature-qualified charging, ideal diode reverse-current blocking, programmable charge termination timer, and load-dependent current allocation between system load and battery.
Technical Context
The LTC4055EUF#TRPBF implements dual-path PowerPath™ architecture: it dynamically allocates input current between system load (OUT) and battery (BAT) while enforcing USB current limits via HPWR-selectable modes. Its linear charger uses external PROG resistor for precise charge current setting and CLPROG for input current limiting, both referenced to internal 1V bandgap.
It integrates an ideal diode controller (VBAT-to-OUT path) with <20mV forward drop at 80mA and <100mV at 400mA, plus dedicated comparators for WALL adapter detection, SUSP mode entry, and NTC-based cold/hot fault thresholds (0.74×VNTC / 0.29×VNTC). Thermal regulation activates at 105°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.35V to 5.5V - ensures compatibility with USB VBUS (4.75–5.25V nominal) including tolerance margins and cable drop. |
| Float Voltage Accuracy | 4.200V ±0.8% (0°C to 85°C) - guarantees Li-ion cell safety and cycle life within JEITA-compliant voltage window. |
| Max Charge Current | Programmable up to 1A via RPROG - supports fast charging of 0.8Ah cells in ≤3 hours with thermal foldback. |
| USB Input Current Limit | Selectable 500mA (HPWR = high) or 100mA (HPWR = low) - enforces USB 2.0 standard compliance without host negotiation. |
| Ideal Diode Forward Drop | ≤55mV at 600mA (VBAT = 3.5V) - minimizes power loss and heat during battery-to-load power transfer. |
| NTC Thermistor Interface | VNTC bias = 3.8V ±0.2V; Cold/Hot thresholds at 0.74×/0.29×VNTC - enables accurate ±3°C hysteresis temperature qualification per JEITA. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer portable equipment environments. |
Pinout & Package
16-pin (4mm × 4mm × 0.75mm) QFN package with exposed thermal pad (Pin 17 = GND), optimized for compact USB-powered portable designs requiring low profile and efficient thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 / IN2 | USB VBUS input pair | Dual-input topology ensures <100mV differential; must be tied with ≤0.05Ω trace for accurate current sensing and UVLO operation. |
| BAT | Li-ion battery connection | Charging node and backup power source; internal 4.2V regulator reference and recharge threshold (VFLOAT – 100mV). |
| OUT | System load output | Powered by USB or battery via ideal diode; supports wall adapter input when used as secondary charging path. |
| HPWR | High-power select input | Logic-controlled current limit mode: >1.2V → 500mA input limit; <0.4V → 100mA - no external pull-up required (internal weak pull-down). |
| PROG | Charge current programming | 1V reference input; ICHG = 48.5kΩ / RPROG - sets full-charge current (e.g., 485mA with 100kΩ). |
| CLPROG | Input current limit programming | 1V reference input; ICL = 49kΩ / RCLPROG - sets USB current cap (e.g., 490mA with 100kΩ). |
| NTC / VNTC | Thermistor monitoring interface | VNTC supplies 3.8V bias; NTC pin compares voltage to cold/hot thresholds - open-circuit or short disables NTC function. |
| CHRG | Open-drain charge status | Pulled low during active charging; high-Z when timer expires, input removed, or fault occurs - drives LED directly. |
Key Features
| Feature | Design Value |
|---|---|
| Load-dependent charging | Automatically reduces battery charge current as system load increases - maintains strict USB input current compliance without firmware intervention. |
| PowerPath™ switchover | Seamless transition from USB to battery power with <100mV output droop - eliminates brownout during disconnect and preserves system uptime. |
| Thermal feedback regulation | Junction temperature foldback at 105°C - prevents overheating during high-current charging in enclosed enclosures without external thermal sensors. |
| Trickle-charge recovery | Auto-initiates C/10 pre-charge below 2.8V battery voltage - safely revives deeply discharged Li-ion cells before CC/CV phase. |
| USB suspend mode | Reduces input current to ≤1.6mA (typ) while maintaining BAT→OUT ideal diode and NTC monitoring - meets USB 2.0 low-power suspend requirements. |
Applications
| USB-Powered Portable Audio | Handheld Medical Monitor |
|---|---|
Use Scenario: MP3 player charges from PC USB port while playing audio through integrated DAC and amplifier. IC Role / Device Role / Timing Role: USB power manager and Li-ion charger - regulates total input current, powers system from VBUS or battery, and terminates charge at 4.2V. Use Value: Enables simultaneous charging and playback without violating 500mA USB limit; ideal diode prevents battery drain during USB disconnect. |
Use Scenario: Battery-backed vital signs monitor operates continuously on USB bus power and switches to battery during cable removal. IC Role / Device Role / Timing Role: Dual-path power controller - manages USB input, battery charging, and seamless switchover with NTC temperature qualification. Use Value: Ensures uninterrupted operation during clinical use; NTC monitoring prevents charging outside 0°C–50°C medical safety range. |
| Industrial PDA with Hot-Swap Battery | USB-C Powered IoT Sensor Node |
Use Scenario: Ruggedized PDA performs data logging while connected to USB host; battery replaced mid-operation without shutdown. IC Role / Device Role / Timing Role: PowerPath™ controller - isolates battery during hot-swap, re-enables charging post-insertion, and maintains system rail stability. Use Value: Eliminates need for manual power cycling; soft-start and UVLO prevent inrush transients during battery insertion. |
Use Scenario: Low-power environmental sensor node draws power from USB-C port and charges internal Li-ion cell for off-grid operation. IC Role / Device Role / Timing Role: USB-compliant charger with programmable timer - configures 4-hour charge window and suspends charging during USB suspend. Use Value: Extends battery life via 4.2V ±0.8% precision float voltage and automatic recharge at 4.1V - avoids overvoltage stress and capacity loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB power management and Li-ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGER | Fixed 500mA charge current; no HPWR-selectable input limit; integrated LDO for VBUS pass-through | Lacks load-dependent current allocation - requires external current limiting for USB compliance under variable load | Choose for simpler BOM where fixed current suffices and VBUS pass-through is needed |
| MAX1555ETA+ | Fixed 100mA/500mA USB current limit; no NTC interface; smaller 10-pin μDFN package | No temperature-qualified charging - unsuitable for medical or high-reliability thermal environments | Choose for space-constrained consumer devices without thermal safety requirements |
Compared with BQ24075RGER and MAX1555ETA+, the LTC4055EUF#TRPBF uniquely combines HPWR-selectable USB current limiting, NTC-based thermal qualification, and dynamic load-dependent charge current adjustment - making it optimal for portable systems requiring robust USB compliance and battery safety.
Availability
LTC4055EUF#TRPBF is available at Aetrix Electronics and suitable for USB-powered portable audio, handheld medical monitors, rugged PDAs, and IoT sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature operation.
Supply support for LTC4055EUF#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC4055EUF#TRPBF belongs to Linear's PowerPath™ USB power management family, designed specifically for portable battery-powered USB peripherals that demand strict current compliance, thermal safety, and seamless power switchover.
FAQ
What is the exact float voltage and accuracy of the LTC4055EUF#TRPBF?
The LTC4055EUF#TRPBF provides a tightly regulated 4.200V float voltage with ±0.8% accuracy over –40°C to +85°C, ensuring safe and optimal charging of single-cell Li-ion batteries. This specification is confirmed in the Electrical Characteristics table (VFLOAT parameter) and applies under 2mA load conditions - critical for maintaining battery longevity and JEITA compliance.
How does the LTC4055EUF#TRPBF handle USB suspend mode?
The LTC4055EUF#TRPBF enters USB-compliant suspend mode when the SUSP pin is pulled above 1.2V, reducing input supply current to ≤1.6mA (typical) while keeping the BAT-to-OUT ideal diode active and NTC monitoring functional. The CHRG pin remains asserted if charging was active, and the charge timer resets only if VOUT falls below VBAT during suspend - preserving state integrity across USB enumeration cycles.
Can the LTC4055EUF#TRPBF charge a battery while powering the system from a wall adapter?
Yes - the LTC4055EUF#TRPBF supports output-powered charging: when a wall adapter raises the OUT pin above UVLO (≥3.5V) and the WALL pin exceeds 0.98V, it disables the IN1/IN2-to-OUT path and enables charging from OUT to BAT. This allows simultaneous system operation and battery top-off using external wall adapter circuitry, with ACPR signaling wall presence.
What is the purpose of the HPWR pin on the LTC4055EUF#TRPBF?
The HPWR pin on the LTC4055EUF#TRPBF selects USB input current limit mode: logic-high (>1.2V) enables 500mA operation (full USB spec), while logic-low (<0.4V) restricts to 100mA (USB low-power). It also scales charge current proportionally - e.g., 500mA limit yields ~485mA charge current with 100kΩ PROG resistor, whereas 100mA limit yields ~97mA - ensuring end-to-end compliance.
Does the LTC4055EUF#TRPBF support temperature-qualified charging?
Yes - the LTC4055EUF#TRPBF integrates a dedicated NTC thermistor interface with VNTC bias (3.8V) and comparator thresholds at 0.74×VNTC (cold fault) and 0.29×VNTC (hot fault), providing ±3°C hysteresis. When NTC voltage breaches these thresholds, charging pauses but the timer continues; resumption occurs automatically once temperature returns to safe range - meeting JEITA Class 1 requirements.
LTC4055EUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- Over Temperature, Reverse Current
- Charge Current - Max:
- 1A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- USB
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
LTC4055EUF#TRPBF FAQ
1.How can I place an order for LTC4055EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4055EUF#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 LTC4055EUF#TRPBF reliable?
The price and inventory of LTC4055EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4055EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4055EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4055EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4055EUF#TRPBF?
LTC4055EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4055EUF#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 LTC4055EUF#TRPBF?
For technical support, including LTC4055EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4055EUF#TRPBF requirements.
6.How does Aetrix verify that LTC4055EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4055EUF#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 LTC4055EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4055EUF#TRPBF?
All LTC4055EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4055EUF#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 LTC4055EUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC4055EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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