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Analog Devices Inc. LTC4055EUF#PBF
- Part No.:
- LTC4055EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LTC4055EUF#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,168
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Product details
Overview
LTC4055EUF#PBF 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 compliant, safe, and efficient charging in portable USB devices such as MP3 players, digital cameras, and PDAs.
For engineers reviewing the LTC4055EUF#PBF datasheet, LTC4055EUF#PBF pinout, LTC4055EUF#PBF application, or LTC4055EUF#PBF equivalent, key selection considerations include USB current compliance under load-dependent charging, ideal diode operation for seamless battery switchover, NTC thermistor-based temperature-qualified charging, and programmable charge termination timing via external capacitor.
Technical Context
The LTC4055EUF#PBF implements dual-path power management: it regulates input current from USB VBUS (IN1/IN2) to both system load (OUT) and battery (BAT), dynamically reducing charge current as load current increases to maintain USB compliance. Its internal CC/CV linear charger uses thermal feedback to prevent overheating during high-power operation.
PowerPath™ control enables automatic switchover between USB supply and battery, with ideal diode behavior (≤100mV forward drop at 400mA) and reverse current blocking. The IC supports wall adapter detection (WALL pin), suspend mode (SUSP), shutdown (SHDN), and NTC-based temperature qualification - all managed through dedicated logic inputs and analog monitoring pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.35V to 5.5V - ensures compatibility with USB 2.0 VBUS (4.75–5.25V) plus margin for cable drop and tolerance. |
| Float Voltage Accuracy | 4.200V ±0.8% (0°C to 85°C) - guarantees precise Li-ion termination to maximize cycle life and safety. |
| Max Input Current Limit | 500mA (HPWR = high) or 100mA (HPWR = low) - meets USB 2.0 standard current limits without external circuitry. |
| Charge Current Programmability | Up to 1A via PROG pin resistor (RPROG = 34kΩ) - enables flexible design for varying battery capacities and thermal constraints. |
| Ideal Diode Forward Drop | ≤55mV at 100mA, ≤50mV at 5mA - minimizes voltage loss during battery-to-load power transfer, preserving system efficiency. |
| NTC Thermistor Interface | VNTC bias (3.4–3.8V), cold/hot fault thresholds at 0.74×/0.29× VNTC - supports accurate battery temperature monitoring across –20°C to +60°C range. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer portable applications with extended ambient requirements. |
Pinout & Package
The LTC4055EUF#PBF is housed in a 16-lead (4mm × 4mm × 0.75mm) QFN package with exposed pad (Pin 17) soldered to PCB ground for thermal management. Pin count, layout, and thermal pad are fully validated per Linear Technology's UF package specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 / IN2 | USB VBUS input pair | Dual-input architecture with ≤100mV inter-pin differential tolerance - enables robust connection to noisy or split-PCB USB traces. |
| BAT | Battery terminal | Direct connection to single-cell Li-ion anode; hosts precision 4.2V regulation and recharge threshold (VFLOAT – 100mV). |
| OUT | System power output | Supplies load from USB or battery; features ideal diode path to BAT with <100mV dropout - eliminates need for external Schottky. |
| PROG | Charge current programming | Connects to ground via RPROG to set ICHG = 48.5kΩ / RPROG - enables accurate, resistor-tuned charge rates from 45mA to 1A. |
| CLPROG | Input current limit programming | Connects to ground via RCLPROG to set ICL = 49kΩ / RCLPROG - configures USB-compliant 100mA/500mA limits. |
| HPWR | High-power select | Digital input (VIH ≥1.2V, VIL ≤0.4V) that scales ICL and ICHG by 5× - selects full or reduced USB power mode. |
| SUSP | USB suspend enable | Activates low-IQ suspend mode (<1.6μA) while retaining BAT→OUT diode function - satisfies USB 2.0 suspend current spec. |
| CHRG | Charge status indicator | Open-drain output pulled low during active charging - drives LED directly without series resistor. |
| NTC / VNTC | Temperature sensing interface | Forms resistive divider with external NTC thermistor - triggers charge suspension outside 0°C–45°C window. |
| WALL | Wall adapter detect input | Enables alternate charging path from OUT when >1.0V applied - disables USB charging and asserts ACPR to signal adapter presence. |
Key Features
| Feature | Design Value |
|---|---|
| Load-dependent charging | Maintains USB input current compliance by automatically reducing charge current as system load increases - no firmware or external control required. |
| PowerPath™ ideal diode | Provides seamless switchover from USB to battery with ≤100mV dropout and zero reverse leakage - eliminates voltage sag and extends runtime during USB disconnect. |
| Thermal regulation | Reduces charge current when junction temperature exceeds 105°C - prevents thermal runaway without external sensors or shutdown. |
| Programmable termination timer | External capacitor on TIMER pin sets total charge time (e.g., 0.1μF = ~3 hours) - avoids overcharge in high-impedance or aging cells. |
| Trickle-charge recovery | Automatically applies 10% of programmed ICHG when VBAT < 2.85V - safely reconditions deeply discharged Li-ion cells before CC mode. |
Applications
| USB-Powered Portable Audio | Digital Camera Power Management |
|---|---|
Use Scenario: MP3 player draws variable load (50–300mA) while charging 800mAh Li-ion cell from USB port. IC Role / Device Role / Timing Role: LTC4055EUF#PBF manages total input current, supplies system from VBUS or battery, and charges cell at up to 500mA with thermal foldback. Use Value: Ensures USB 2.0 compliance even at peak load; eliminates need for separate power switch or charger IC. | Use Scenario: Compact digital camera requires fast startup, flash power burst, and USB charging without brownout. IC Role / Device Role / Timing Role: LTC4055EUF#PBF provides low-dropout ideal diode path for instant battery backup and regulates charge current to avoid flash-induced voltage collapse. Use Value: Prevents system reset during flash discharge; maintains stable 4.2V rail during simultaneous charge/load operation. |
| PDA Battery Backup System | USB-Clinical Monitoring Device |
Use Scenario: PDA operates continuously from battery but must charge within 2 hours when connected to host PC via USB. IC Role / Device Role / Timing Role: LTC4055EUF#PBF enables full 500mA charging while powering 200mA system load - dynamically allocating remaining current to battery. Use Value: Achieves <2.5-hour full charge (0–4.2V) with no software coordination or current-sense amplifiers. | Use Scenario: Handheld ECG monitor must operate 8+ hours on battery and support hot-plug USB charging in clinical settings. IC Role / Device Role / Timing Role: LTC4055EUF#PBF integrates NTC thermistor monitoring, suspend mode for USB idle, and wall adapter detection for hospital-grade AC charging. Use Value: Meets IEC 60601-1 thermal safety requirements; enables dual-source (USB/wall) charging without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB power manager and Li-ion charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGTR | Fixed 500mA input limit; no HPWR-selectable 100mA mode; lacks WALL input and ACPR output. | Requires external wall adapter detection circuitry; no native support for dual-source (USB + wall) charging topology. | Choose for cost-sensitive designs where wall adapter support is unnecessary and fixed-current USB compliance suffices. |
| MAX1555ESA+ | Fixed 100mA/500mA limits (no resistor programming); no NTC interface; smaller 10-pin μDFN package. | Cannot adapt charge current or input limit to battery capacity or thermal conditions; limited temperature safety functionality. | Choose for space-constrained, low-complexity applications where programmability and thermal qualification are not required. |
Compared with BQ24075RGTR and MAX1555ESA+, the LTC4055EUF#PBF offers unique integration of programmable current limits, wall adapter detection with automatic path switching, and full NTC-based temperature qualification - making it optimal for portable medical, industrial, and premium consumer devices requiring robust, standards-compliant battery management.
Availability
LTC4055EUF#PBF is available at Aetrix Electronics and suitable for USB-powered portable audio, digital imaging, handheld computing, and clinical monitoring applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC4055EUF#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.
The LTC4055EUF#PBF belongs to Linear's PowerPath™ family of battery management ICs, designed specifically for USB-compliant, thermally robust, and feature-rich power management in space-constrained portable electronics.
FAQ
What is the exact float voltage and accuracy of the LTC4055EUF#PBF?
The LTC4055EUF#PBF regulates battery voltage to 4.200V with ±0.8% accuracy over –40°C to +85°C. This specification is guaranteed for the LTC4055 variant (not the -1 version, which uses 4.100V). The tight tolerance ensures reliable Li-ion cell termination, preventing overcharge and extending cycle life without external calibration.
How does the LTC4055EUF#PBF handle USB suspend mode compliance?
The LTC4055EUF#PBF enters USB suspend mode when the SUSP pin is driven high (>1.2V), reducing input supply current to ≤1.6μA while maintaining BAT-to-OUT ideal diode functionality. This satisfies USB 2.0 specification requirements for suspended peripheral devices and allows continuous system operation from battery during host-initiated suspend.
Can the LTC4055EUF#PBF charge a battery while simultaneously powering a load from USB?
Yes. The LTC4055EUF#PBF performs concurrent load and charge operation using its PowerPath™ architecture. When powered from IN1/IN2, it dynamically allocates available input current between the system load (OUT) and battery (BAT), ensuring total current remains within the programmed USB limit (100mA or 500mA) - no external current sharing circuitry is needed.
What is the purpose of the WALL pin on the LTC4055EUF#PBF?
The WALL pin on the LTC4055EUF#PBF detects presence of a wall adapter applied to the OUT node. When pulled above 1.0V, it disables USB charging, disconnects the IN1/IN2-to-OUT power path, and pulls ACPR low - enabling automatic fallback to wall-powered operation and battery charging from OUT. This supports dual-source (USB + wall) portable devices without manual switching.
Does the LTC4055EUF#PBF support temperature-qualified charging, and how is it implemented?
Yes. The LTC4055EUF#PBF supports NTC thermistor-based temperature qualification via dedicated NTC and VNTC pins. It monitors battery temperature using a resistor divider formed by the NTC and an external resistor to VNTC (3.4–3.8V bias), suspending charge if voltage falls outside 0.29×VNTC (hot) or rises above 0.74×VNTC (cold) - providing critical safety for Li-ion cells in consumer and medical applications.
LTC4055EUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC4055EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4055EUF#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 LTC4055EUF#PBF reliable?
The price and inventory of LTC4055EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4055EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC4055EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4055EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4055EUF#PBF?
LTC4055EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4055EUF#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 LTC4055EUF#PBF?
For technical support, including LTC4055EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4055EUF#PBF requirements.
6.How does Aetrix verify that LTC4055EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4055EUF#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 LTC4055EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC4055EUF#PBF?
All LTC4055EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4055EUF#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 LTC4055EUF#PBF part is unused and in its original packaging.
Return procedure for LTC4055EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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