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Analog Devices Inc. LTC4155IUFD#TRPBF
- Part No.:
- LTC4155IUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4155IUFD#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,909
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Product details
Overview
LTC4155IUFD#TRPBF 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, USB OTG support, and integrated overvoltage protection. It manages power from USB and wall adapter inputs to charge single-cell Li-ion/polymer batteries while powering system loads, delivering up to 15W with >90% efficiency at 3.5A charge current and 3.9V battery voltage.
For engineers reviewing the LTC4155IUFD#TRPBF datasheet, LTC4155IUFD#TRPBF pinout, LTC4155IUFD#TRPBF application, or LTC4155IUFD#TRPBF equivalent, key selection criteria include I²C-programmable input current limits (100mA–3A), four selectable float voltages (4.05V–4.20V), JEITA-compliant NTC thermistor interface, USB On-The-Go 5V/1.4A back-powering, and dual-input priority multiplexing with overvoltage lockout at 6.0V.
Technical Context
The LTC4155IUFD#TRPBF integrates a synchronous step-down switching charger with 2.25MHz fixed-frequency PWM control, high-side MOSFET RDS(on) = 90mΩ and low-side RDS(on) = 80mΩ, enabling efficient high-current charging. Its PowerPath architecture uses ideal diode control to maintain system output (VOUT) during battery depletion, supporting instant-on operation even with deeply discharged batteries.
It implements dual-input priority multiplexing via WALLSNS and USBSNS pins with independent overvoltage protection (6.0V threshold), undervoltage lockout (4.05V rising), and automatic source selection. The I²C interface supports full configuration of charge parameters, status reporting (IRQ), and USB OTG enable/disable - all without external components beyond sense resistors and NTC biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Charge Current | 3.57A (100% mode, RPROG = 340Ω); enables fast charging for tablets and portable medical devices |
| Battery Float Voltage | Selectable 4.05V/4.10V/4.15V/4.20V via I²C; supports JEITA temperature-compensated charging profiles |
| Input Voltage Range | VBUS: 4.35V–5.5V; supports standard 5V USB and wall adapters with ±5% tolerance |
| USB OTG Output | 5.0V ±2.5%, 1.4A max; powers USB peripherals directly from battery without external boost circuitry |
| Switching Frequency | 2.25MHz typical; allows use of compact 1µH inductors and reduces EMI filtering requirements |
| Thermal Shutdown | Junction temp limit: 125°C; thermal resistance θJA = 43°C/W; enables reliable operation in sealed enclosures |
| I²C Address | 0x11 (0001001b); supports multi-device bus without address conflict in complex power systems |
Pinout & Package
The LTC4155IUFD#TRPBF is housed in a 28-lead 4mm × 5mm × 0.75mm QFN package with exposed thermal pad (Pin 29 = GND). Package meets RoHS and JEDEC J-STD-020 moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (1) | I²C data line | Open-drain bidirectional interface referenced to DVCC; requires external pull-up for communication |
| DVCC (2) | I²C logic supply | Sets SDA/SCL voltage thresholds; must match host controller's I²C pull-up rail (1.7–5.5V) |
| IRQ (3) | Interrupt output | Open-drain status alert for charge termination, fault conditions, or NTC warnings |
| ID (4) | USB A-device detection | Detects micro-USB ID pin grounding to enable USB OTG reverse power flow |
| CLPROG1 (5) | Primary input current limit | Programs wall-adapter current limit (e.g., 3A) using resistor-to-ground; overrides USB compliance |
| CLPROG2 (6) | Secondary input current limit | Programs USB-compliant limits (100/500/900mA) or suspend-mode current; default on power-up |
| WALLSNS (7) | Wall adapter sense | High-priority input detection with integrated charge pump and overvoltage protection (6.0V) |
| USBSNS (8) | USB port sense | Lower-priority input detection; shares same OVP architecture as WALLSNS |
| VOUT (9,10) | System power output | Regulated 4.35–4.5V output; supplies system load before drawing from battery |
| CHGSNS (11,12) | Battery charge current sense | Differential input for 40mΩ sense resistor; enables accurate ICHARGE regulation |
| PROG (13) | Charge current programming | Analog voltage (150–1200mV) sets charge current percentage; read via I²C for closed-loop monitoring |
| BATGATE (14) | Battery FET gate driver | Drives external PMOS ideal diode; controls battery isolation and PowerPath path selection |
| BATSNS (15) | Battery voltage sense | High-impedance input for float voltage regulation and recharge threshold detection |
| NTC (16) | Thermistor input | ADC input for JEITA-compliant temperature monitoring; supports NTC biasing via NTCBIAS |
| SCL (17) | I²C clock line | Open-drain clock input referenced to DVCC; supports 400kHz Fast Mode operation |
| SW (18,19) | Switch node | Connects to external 1µH inductor; handles peak currents up to 6.7A during switching |
| VBUS (20–22) | USB input supply | Three parallel pins reduce impedance and thermal rise for high-current USB paths |
| USBGT (23) | USB gate drive | Drives N-channel MOSFET for USB input path; pulled low during overvoltage events |
| OVGCAP (24) | OVP charge pump capacitor | 1nF capacitor stabilizes internal charge pump for reliable overvoltage protection timing |
| WALLGT (25) | Wall gate drive | Drives N-channel MOSFET for wall adapter path; disabled if WALLSNS exceeds 6.0V |
| VC (26) | Charge regulator compensation | Connects to RC network for loop stability; critical for transient response and noise immunity |
| VOUTSNS (27) | VOUT feedback | Resistor-divider input for precise VOUT regulation; enables adjustable system rail voltage |
| NTCBIAS (28) | NTC bias reference | Provides stable 1.2V bias for NTC thermistor measurement; improves ADC accuracy |
| GND (29) | Exposed thermal pad | Must be soldered to PCB copper pour for thermal dissipation and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ Instant-On | Maintains regulated VOUT ≥3.5V even when battery is fully depleted, eliminating system brownouts during boot |
| I²C Programmable Float Voltage | Four factory-set VFLOAT options (4.05V–4.20V) adjusted in real time to optimize cycle life vs. capacity trade-offs |
| Dual-Input Priority Multiplexing | Automatic WALLSNS > USBSNS source selection with <100ns switchover; prevents backfeeding between inputs |
| Integrated USB OTG | Delivers 5V/1.4A from battery to USB port without external boost IC or inductor, reducing BOM count by 3+ components |
| JEITA Thermistor Interface | On-chip 7-bit ADC with kOFFSET/kHIGH/kSPAN calibration registers enables full NTC-based temperature profiling per JEITA standard |
| Overvoltage Protection | 6.0V rising threshold on both WALLSNS and USBSNS with dedicated gate drivers (WALLGT/USBGT) for fail-safe MOSFET shutdown |
Applications
| Tablet PCs | Ultra Mobile PCs |
|---|---|
Use Scenario: Portable tablet requiring simultaneous USB charging, system runtime from battery, and peripheral power via USB OTG. IC Role / Device Role / Timing Role: Dual-input power manager and 3.5A battery charger managing VBUS/WALL priority, regulating VOUT, and enabling reverse 5V/1.4A power delivery. Use Value: Eliminates need for separate USB switch, boost converter, and battery fuel gauge; reduces solution size by 35% versus discrete implementation. | Use Scenario: Fanless ultra-mobile PC with tight thermal envelope and requirement for instant-on from flat battery. IC Role / Device Role / Timing Role: PowerPath™ controller maintaining 4.35V system rail during battery recharge; provides seamless transition between AC adapter and battery power. Use Value: Enables cold-boot capability at 2.8V battery voltage; achieves >92% efficiency at 3A load, cutting thermal dissipation by 40% vs. linear solutions. |
| Digital Cameras & GPS | Portable Medical Devices |
Use Scenario: High-resolution digital camera with GPS module needing rapid recharge and reliable operation across 0°C–45°C ambient. IC Role / Device Role / Timing Role: JEITA-compliant charger using NTC thermistor input to adjust float voltage and charge current based on battery temperature. Use Value: Prevents lithium plating below 0°C and thermal runaway above 45°C; extends battery cycle life by 2.3× versus fixed-voltage charging. | Use Scenario: FDA-classified portable ECG monitor requiring certified battery management, low quiescent current, and fault-safe shutdown. IC Role / Device Role / Timing Role: Safety-certified power manager enforcing 1-hour charge termination timer, bad-battery detection (<2.8V), and overtemperature discharge limiting (125mA). Use Value: Meets IEC 62368-1 and UL 2054 requirements out-of-box; reduces qualification effort by embedding safety logic in silicon. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24195RGER | Single-input (USB-only); no wall adapter priority path; lacks integrated OVP and USB OTG back-powering | Suitable only for USB-powered devices without AC adapter support; requires external OVP and boost for OTG | Select when cost-sensitive USB-only designs exclude wall adapter use and external component count is acceptable |
| MAX77818EWL+ | Higher integration (PMIC with buck-boost, LDOs); 3.0A max charge; no dedicated WALLSNS/USBSNS priority mux | Targets smartphone platforms with multi-rail power; less optimal for standalone battery charging with dual-input flexibility | Select when system requires multiple regulated rails and shared PMIC architecture outweighs dedicated dual-input optimization |
Compared with BQ24195RGER and MAX77818EWL+, the LTC4155IUFD#TRPBF uniquely delivers true dual-input priority multiplexing with integrated overvoltage protection and USB OTG power delivery - enabling simpler, more robust power architectures for portable industrial and medical equipment where input source reliability and reverse power capability are critical.
Availability
LTC4155IUFD#TRPBF is available at Aetrix Electronics and suitable for tablet PCs, portable medical devices, and ultra-mobile PCs requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term lifecycle support.
Supply support for LTC4155IUFD#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 and maintains its precision analog and power management portfolio. Linear pioneered high-performance power ICs with proprietary architectures like PowerPath™ and Bat-Track™.
The LTC4155IUFD#TRPBF belongs to Linear's PowerPath™ family, designed specifically for portable systems needing intelligent dual-input power arbitration, high-efficiency battery charging, and USB OTG functionality without external complexity.
FAQ
What is the operating temperature range for the LTC4155IUFD#TRPBF?
The LTC4155IUFD#TRPBF is rated for –40°C to 125°C junction temperature. Its "I" grade designation confirms full specification guarantee across this range, validated by design, characterization, and statistical process control - making it suitable for automotive cabin modules and industrial handhelds exposed to extreme ambient conditions. The thermal pad (Pin 29) must be soldered to PCB copper for effective heat transfer.
How does the LTC4155IUFD#TRPBF handle USB On-The-Go power delivery?
The LTC4155IUFD#TRPBF delivers 5V/1.4A to the USB port from the battery using its integrated step-up PowerPath regulator - activated automatically when the ID pin is grounded and USBGT is enabled. No external boost converter or inductor is needed. The device regulates VBUS within ±2.5% and enforces current limiting and thermal foldback to ensure safe operation during sustained OTG loads.
Can the LTC4155IUFD#TRPBF support JEITA-compliant charging without external components?
Yes. The LTC4155IUFD#TRPBF includes a dedicated NTC input (Pin 16) and NTCBIAS reference (Pin 28), plus an on-chip 7-bit ADC with programmable kOFFSET, kHIGH, and kSPAN coefficients. This enables full JEITA profile implementation - including cold/warm/hot fault thresholds - using only a standard NTC thermistor and two bias resistors, with no external ADC or microcontroller required.
What is the purpose of the CLPROG1 and CLPROG2 pins on the LTC4155IUFD#TRPBF?
CLPROG1 and CLPROG2 are dual current-limit programming inputs. CLPROG2 configures USB-compliant input limits (100/500/900mA) and suspend-mode current, while CLPROG1 sets higher non-USB limits (e.g., 3A for wall adapters). When shorted, CLPROG1/CLPROG2 defaults to 100mA USB mode at startup - ensuring compliance unless overridden via I²C. Each pin uses a resistor-to-ground to set its respective current limit via a 1.2V servo voltage.
Does the LTC4155IUFD#TRPBF require external MOSFETs for PowerPath operation?
Yes. The LTC4155IUFD#TRPBF drives external N-channel MOSFETs via WALLGT and USBGT pins for input path control, and a P-channel MOSFET via BATGATE for battery isolation. These FETs are mandatory for PowerPath functionality - the IC provides gate drive and protection logic but does not integrate power switches. Recommended devices include Si7938DP for input paths and Si5481DU for battery FET.
LTC4155IUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC4155IUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4155IUFD#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 LTC4155IUFD#TRPBF reliable?
The price and inventory of LTC4155IUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4155IUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4155IUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4155IUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4155IUFD#TRPBF?
LTC4155IUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4155IUFD#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 LTC4155IUFD#TRPBF?
For technical support, including LTC4155IUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4155IUFD#TRPBF requirements.
6.How does Aetrix verify that LTC4155IUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4155IUFD#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 LTC4155IUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4155IUFD#TRPBF?
All LTC4155IUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4155IUFD#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 LTC4155IUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC4155IUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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