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Analog Devices Inc. LTC4155IUFD#PBF
- Part No.:
- LTC4155IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4155IUFD#PBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:632
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Product details
Overview
LTC4155IUFD#PBF from Analog Devices (formerly Linear Technology) is a dual-input I²C-controlled power manager and 3.5A Li-ion battery charger with PowerPath™ instant-on operation. It manages power distribution from USB and wall adapter inputs to a single-cell Li-ion/polymer battery and system load, delivering up to 15W with switching efficiency >90% at 3.5A charge current and supporting USB On-The-Go (OTG) back-powering at 5V/1.4A.
For engineers reviewing the LTC4155IUFD#PBF datasheet, LTC4155IUFD#PBF pinout, LTC4155IUFD#PBF application, or LTC4155IUFD#PBF equivalent, key selection criteria include I²C-programmable input current (100mA–3A), float voltage (4.05V–4.20V), charge termination, NTC-based JEITA temperature profiling, and dual-input priority multiplexing with overvoltage protection on VBUS/WALLSNS.
Technical Context
The LTC4155IUFD#PBF integrates a synchronous step-down switching charger with integrated high-side (RPMOS = 90mΩ) and low-side (RNMOS = 80mΩ) MOSFET drivers, enabling up to 3.5A regulated battery charge current and 3A input current limit. Its PowerPath architecture provides seamless switchover between input sources and maintains system operation during battery charging or depletion.
It features dual independent current-sense paths (CLPROG1/CLPROG2) for precise input current limiting, an integrated thermistor ADC for JEITA-compliant charge algorithms, and hardware-level overvoltage protection (6.0V threshold) with active gate-drive outputs (USBGT/WALLGT) for external N-MOSFET control - all coordinated via a 400kHz I²C interface with fixed address 0x11.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | VBUS: 4.35V–5.5V; supports USB 2.0/3.0 and wall adapter inputs with undervoltage lockout at 4.05V |
| Max Charge Current | 3.57A (100% mode, RPROG = 340Ω); enables full-rate charging of 2600mAh+ batteries in <3 hours |
| Battery Float Voltage | Programmable via I²C: 4.05V/4.10V/4.15V/4.20V; supports Li-ion, Li-polymer, and JEITA thermal profiles |
| PowerPath Output (VOUT) | Regulated 4.35V–4.5V; delivers up to 3.66A before drawing from battery; supports instant-on with low-battery operation down to 3.4V |
| USB OTG Output | 5V ±2.5% at up to 1.4A; enabled without external components using internal boost path and ID-pin detection |
| Thermal Management | NTC ADC with kOFFSET = 0.113 V/V, kHIGH = 0.895 V/V, and JEITA thresholds (TOO_COLD/TOO_WARM/HOT_FAULT) mapped to 7-bit digital values |
| Switching Frequency | 2.25MHz typical; allows use of compact 1µH inductors and reduces EMI in space-constrained portable designs |
Pinout & Package
Package: 28-lead 4mm × 5mm × 0.75mm plastic QFN with exposed pad (Pin 29 = GND, must be soldered).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (1) | I²C data line | Open-drain bidirectional bus line referenced to DVCC; supports 400kHz standard-mode I²C communication |
| DVCC (2) | I²C logic supply | Sets SDA/SCL input thresholds; must match pull-up resistor supply voltage (1.7V–VMAX) |
| IRQ (3) | Interrupt output | Open-drain status flag for maskable events: charge done, fault, NTC warning, VBUS/WALL presence |
| ID (4) | USB A-device detection | Pull-down detection pin enabling automatic USB OTG mode when mini/micro-USB A-cable is connected |
| CLPROG1 (5) | Primary input current sense | Hardware-programmed current limit (e.g., 3A wall adapter mode); servo voltage clamped at 1.2V |
| CLPROG2 (6) | Secondary input current sense | I²C-selectable USB-compliant limits (100/500/900mA) or suspend-mode regulation (2.5mA) |
| WALLSNS (7) | Wall adapter sense & OVP input | High-priority input monitoring; triggers WALLGT gate drive and disables pass FETs if VWALLSNS > 6.0V |
| USBSNS (8) | USB input sense & OVP input | Secondary input monitoring; activates USBGT gate drive and disables pass FETs if VUSBSNS > 6.0V |
| VOUT (9,10) | PowerPath system output | Dual-pin power delivery node; supplies system load directly from input or battery with seamless transition |
| CHGSNS (11,12) | Battery charge current sense | Differential input to internal current-sense amplifier; RCHG = 40mΩ sets full-scale range |
| PROG (13) | Charge current programming | Analog voltage input (150–1200mV) scaled to set ICHARGE from 290mA to 2.43A in 15 discrete steps |
| BATGATE (14) | Battery ideal diode gate driver | Drives external P-MOSFET to minimize forward drop and prevent reverse battery discharge |
| BATSNS (15) | Battery voltage sense | High-impedance input for accurate float voltage regulation and recharge threshold detection |
| NTC (16) | Thermistor top connection | Connects to NTC thermistor; forms divider with NTCBIAS to enable JEITA temperature-dependent charging |
| SCL (17) | I²C clock line | Open-drain clock input referenced to DVCC; requires external pull-up resistor |
| SW (18,19) | Switch node | Internal switch node connecting to external 1µH inductor; operates at 2.25MHz switching frequency |
| VBUS (20–22) | USB input supply | Primary 5V input pin; accepts USB power with integrated overvoltage protection and current limiting |
| USBGT (23) | USB gate drive output | Active-high output driving external N-MOSFET source; pulled low during overvoltage fault |
| OVGCAP (24) | OVP charge pump capacitor | Connects to 47nF capacitor; generates boosted gate drive for USBGT/WALLGT outputs |
| WALLGT (25) | Wall adapter gate drive output | Active-high output driving external N-MOSFET source; pulled low during overvoltage fault |
| VC (26) | Charge control compensation | Connects to RC network for loop stability of battery charge regulation |
| VOUTSNS (27) | VOUT feedback sense | Monitors regulated VOUT voltage; used for closed-loop regulation and low-battery instant-on mode |
| NTCBIAS (28) | Thermistor bias reference | Provides stable 1.21V bias for NTC divider; enables ratiometric ADC measurement of temperature |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ instant-on operation | Maintains system VOUT ≥3.4V even with fully depleted battery, eliminating boot failure in portable devices |
| I²C programmable charge parameters | Enables runtime adjustment of float voltage, charge current, safety timer (1–8 hrs), and recharge threshold without hardware change |
| Dual-input priority multiplexer with OVP | Automatically selects highest-priority valid input (WALL > USB); blocks transients >6.0V using charge-pump-driven gate control |
| Integrated JEITA thermistor ADC | 7-bit digital NTC readout with calibrated offset/span; supports cold/warm/hot fault thresholds per JEITA standard |
| USB On-The-Go (OTG) support | Delivers regulated 5V/1.4A from battery to USB port using internal boost path and ID-pin detection-no external components required |
| Low quiescent current modes | 2.5mA USB suspend mode and 0.6µA ship-and-store mode extend shelf life and reduce battery drain during storage |
Applications
| Smartphones | Tablet PCs |
|---|---|
Use Scenario: Dual-input charging in slim form factor with USB-C and proprietary wall adapter support. IC Role / Device Role / Timing Role: Power manager and battery charger managing input prioritization, charge regulation, and system rail stability. Use Value: Enables fast 3.5A charging while maintaining USB compliance and preventing thermal throttling via real-time I²C-adjusted current limits. |
Use Scenario: High-power portable computing with simultaneous battery charging and CPU/GPU load operation. IC Role / Device Role / Timing Role: System power arbiter providing seamless PowerPath switchover and 15W total power delivery. Use Value: Delivers >3.6A system current before battery draw, ensuring uninterrupted performance during video playback or multitasking. |
| Portable Medical Devices | Digital Cameras & GPS Units |
Use Scenario: Battery-powered diagnostic tools requiring reliable operation across wide temperature ranges and long shelf life. IC Role / Device Role / Timing Role: Precision battery conditioner with JEITA-compliant NTC monitoring and ultra-low ship-and-store current (0.6µA). Use Value: Prevents battery overcharge/overdischarge in field-deployed units and extends usable battery capacity by 12–18 months in storage. |
Use Scenario: Intermittent-use imaging devices needing rapid wake-from-sleep and consistent flash power delivery. IC Role / Device Role / Timing Role: Instant-on power supervisor maintaining VOUT ≥3.4V during battery voltage sag under flash LED load. Use Value: Eliminates camera startup delay and ensures reliable flash firing even after extended idle periods or low-temperature exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input Li-ion power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24195RGER | Single-input (USB-only); max 2.2A charge; no wall adapter priority path or WALLSNS/OVGCAP circuitry | Lacks dual-input arbitration, overvoltage protection, and USB OTG back-powering capability | Select only for USB-only portable designs where wall adapter support and OVP are not required |
| MP2615DQ-LF-Z | 3.5A charge but no I²C interface; fixed 4.2V float; no NTC ADC or JEITA support; no USB OTG | Hardware-configured only; no runtime parameter adjustment or temperature-adaptive charging | Choose for cost-sensitive, fixed-function applications where firmware control and thermal safety are handled externally |
Compared with BQ24195RGER and MP2615DQ-LF-Z, the LTC4155IUFD#PBF uniquely combines dual-input priority multiplexing, programmable OVP, I²C-configurable JEITA charging, and integrated USB OTG - making it the only option for feature-rich, field-upgradable portable power systems requiring both USB and wall adapter support with full safety autonomy.
Availability
LTC4155IUFD#PBF is available at Aetrix Electronics and suitable for smartphones, tablet PCs, portable medical devices, and digital cameras requiring stable component supply, industrial temperature grade (–40°C to 125°C), and long-term lifecycle continuity.
Supply support for LTC4155IUFD#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 and continues its legacy of high-performance analog ICs for precision power, signal conditioning, and timing applications.
The LTC4155IUFD#PBF belongs to Linear's PowerPath™ family of battery management ICs, designed specifically for portable electronics demanding intelligent dual-input power arbitration, high-efficiency switching charge, and robust system-level protection.
FAQ
What is the operating temperature range for the LTC4155IUFD#PBF?
The LTC4155IUFD#PBF is rated for –40°C to 125°C junction temperature and is qualified for industrial applications. Its thermal design uses θJA = 43°C/W, and the exposed pad (Pin 29) must be soldered to PCB copper for effective heat dissipation. The device includes internal overtemperature protection that disables charging above TJ = 125°C.
Does the LTC4155IUFD#PBF support USB Battery Charging (BC) 1.2 specification?
No, the LTC4155IUFD#PBF does not implement USB BC 1.2 enumeration or D+/D– handshake. It supports USB 2.0/3.0 power delivery via VBUS sensing and current limiting (100mA/500mA/900mA modes), but relies on external ID-pin detection-not BC 1.2 signaling-for USB OTG activation.
How is the battery recharge threshold configured on the LTC4155IUFD#PBF?
The LTC4155IUFD#PBF sets recharge threshold as a percentage of float voltage (default 97.6%). This value is fixed in silicon and cannot be modified via I²C. Recharge initiates when battery voltage falls below VFLOAT × 0.976, ensuring optimal cycle life without user configuration overhead.
Can the LTC4155IUFD#PBF operate without an external NTC thermistor?
Yes - the LTC4155IUFD#PBF functions fully without NTC connection. Thermistor inputs (NTC/NTCBIAS) are optional; disabling JEITA profiling defaults to standard constant-current/constant-voltage charging. All other features - including I²C control, PowerPath, and USB OTG - remain fully operational.
What is the purpose of the OVGCAP pin on the LTC4155IUFD#PBF?
The OVGCAP pin connects to a 47nF capacitor that stabilizes the internal charge pump supplying gate drive voltage to USBGT and WALLGT outputs. This enables robust turn-on of external N-MOSFETs for overvoltage protection, ensuring fast response (<7.2ms short-circuit fault delay) and reliable high-voltage blocking up to 6.3V.
LTC4155IUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- 3.7A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- I2C, USB
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC4155IUFD#PBF FAQ
1.How can I place an order for LTC4155IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4155IUFD#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 LTC4155IUFD#PBF reliable?
The price and inventory of LTC4155IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4155IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4155IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4155IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4155IUFD#PBF?
LTC4155IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4155IUFD#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 LTC4155IUFD#PBF?
For technical support, including LTC4155IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4155IUFD#PBF requirements.
6.How does Aetrix verify that LTC4155IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4155IUFD#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 LTC4155IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4155IUFD#PBF?
All LTC4155IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4155IUFD#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 LTC4155IUFD#PBF part is unused and in its original packaging.
Return procedure for LTC4155IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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