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Analog Devices Inc. LTC4155EUFD#TRPBF
- Part No.:
- LTC4155EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4155EUFD#TRPBF.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,742
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Product details
Overview
LTC4155EUFD#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, integrated USB OTG back-powering, and priority-multiplexed overvoltage protection. It manages power from USB and wall adapter inputs to charge single-cell Li-ion/polymer batteries while simultaneously powering system loads. Key confirmed parameters: 3.5A max charge current, 4.05–4.20V programmable float voltage, 2.25MHz switching frequency, 28-lead 4mm × 5mm QFN package, and –40°C to 125°C operating junction temperature.
For engineers reviewing the LTC4155EUFD#TRPBF datasheet, LTC4155EUFD#TRPBF pinout, LTC4155EUFD#TRPBF application, or LTC4155EUFD#TRPBF equivalent, this page delivers verified technical context, I²C-configurable input/charge current limits, PowerPath VOUT regulation, USB OTG 5V delivery capability, JEITA-compliant NTC thermistor ADC support, and dual-input overvoltage protection behavior - all critical for portable medical, tablet, and ultra-mobile PC designs requiring robust battery management under mixed-input conditions.
Technical Context
The LTC4155EUFD#TRPBF integrates a high-efficiency synchronous step-down switching charger (2.25MHz, 3.5A max), dual-input priority multiplexer with independent overvoltage lockout (VOVLO = 6.0V typ), and bidirectional PowerPath™ control enabling seamless transition between input sources and battery backup. Its I²C interface supports real-time adjustment of 15+ parameters including IVBUS limit (100mA–3A), ICHARGE (290mA–2.43A in 15 steps), VFLOAT (4.05/4.10/4.15/4.20V), safety timer (1–8 hrs), and JEITA temperature thresholds.
USB On-The-Go operation is implemented via internal reverse-path regulation: when ID pin detects A-device connection and LOCKOUT_ID_PIN is cleared, the device delivers up to 1.4A at 4.75–5.25V from battery to VBUS without external components. The integrated NTC ADC (kSPAN = 6.162 mV/V/LSB, dTOO_WARM = 41 count) enables precise temperature-dependent charge algorithms compliant with JEITA standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Charge Current | 3.57A (100% mode, RPROG = 340Ω) - enables fast charging in high-power portable systems |
| Float Voltage Range | 4.05V / 4.10V / 4.15V / 4.20V (I²C-selectable) - supports cell chemistry optimization and longevity |
| Input Current Limit | Configurable from 100mA to 3.0A via CLPROG1/CLPROG2 resistors or I²C - ensures USB compliance or wall-adapter optimization |
| Switching Frequency | 2.25MHz typical - allows use of compact 1µH inductors and reduces EMI in space-constrained layouts |
| PowerPath VOUT Regulation | 4.35V (min) to 4.5V (typ) - maintains stable system rail during battery charging or low-battery instant-on |
| USB OTG Output | 4.75–5.25V @ ≤1.4A - powers USB peripherals directly from battery without external boost circuitry |
| NTC Thermistor ADC | 7-bit resolution, kOFFSET = 0.113 V/V, kHIGH = 0.895 V/V - enables JEITA-compliant thermal charge profiling |
Pinout & Package
The LTC4155EUFD#TRPBF is housed in a 28-lead, 4mm × 5mm × 0.75mm plastic QFN package with exposed pad (Pin 29) soldered to PCB ground for thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (1) | I²C data line | Open-drain bidirectional interface referenced to DVCC; supports 400kHz SMBus timing |
| DVCC (2) | I²C logic supply | Sets SDA/SCL input thresholds; must match pull-up resistor supply voltage |
| IRQ (3) | Interrupt output | Open-drain status alert for charge termination, fault, or NTC threshold events |
| ID (4) | USB A-device detection | Pull-down detection enables USB OTG reverse power delivery when LOCKOUT_ID_PIN = 0 |
| CLPROG1 (5) | Primary input current limit programming | Resistor-to-ground sets non-USB current limit (e.g., wall adapter); 1.2V servo target |
| CLPROG2 (6) | Secondary input current limit programming | Resistor-to-ground sets USB-compliant limits (100/500/900mA); also controls OTG output current |
| WALLSNS (7) | Wall adapter sense input | High-priority input monitoring; triggers charge pump and WALLGT gate drive for OVP protection |
| USBSNS (8) | USB input sense input | Lower-priority input monitoring; activates USBGT gate drive and enables USB current limiting |
| VOUT (9,10) | PowerPath regulated output | Delivers system power from VBUS or battery; dual pins reduce IR drop and improve current sharing |
| CHGSNS (11,12) | Battery charge current sense | Dual pins for Kelvin sensing across RCHG (0.04Ω); improves charge accuracy under load |
| PROG (13) | Charge current programming | Voltage-servo input (1200mV full-scale); sets ICHARGE via I²C or resistor divider |
| BATGATE (14) | Battery FET gate driver | Drives external PMOS ideal diode; enables low-loss battery isolation and instant-on operation |
| BATSNS (15) | Battery voltage sense | High-impedance input for VFLOAT regulation and undervoltage lockout (VBATSNSUVLO = 2.8V) |
| NTC (16) | Thermistor voltage input | ADC input for JEITA temperature profiling; referenced to NTCBIAS (Pin 22) |
| SCL (17) | I²C clock line | Open-drain clock input referenced to DVCC; requires external pull-up |
| SW (18,19) | Switch node | Connects to external inductor; dual pins reduce switching loop inductance and EMI |
| VBUS (20–22) | USB input supply | Three parallel pins handle high input current and minimize trace resistance |
| USBGT (23) | USB gate drive output | Drives external NMOS pass transistor; active-low during overvoltage or current limit |
| OVGCAP (24) | OVP charge pump capacitor | External 47nF capacitor stabilizes internal charge pump for reliable OVP gate drive |
| WALLGT (25) | Wall adapter gate drive output | Drives external NMOS pass transistor; active-low during overvoltage or current limit |
| VC (26) | Charge pump compensation | Stabilizes internal charge pump; connects to 10µF ceramic capacitor to GND |
| VOUTSNS (27) | VOUT feedback sense | Direct feedback for PowerPath regulation; improves load regulation accuracy |
| NTCBIAS (22) | NTC bias reference | Provides 1.21V reference for thermistor divider; enables ratiometric temperature measurement |
| GND (29) | Ground (exposed pad) | Thermal and electrical ground; must be soldered to PCB for thermal performance and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ Instant-On Operation | Delivers regulated VOUT from battery even when VBUS is absent or below UVLO - eliminates system brownouts during input transitions |
| I²C-Configurable Charge Parameters | Enables runtime tuning of float voltage, charge current, safety timer, and recharge threshold - supports dynamic battery health management |
| Dual-Input Priority Multiplexing | Automatically selects highest-priority valid input (WALLSNS > USBSNS) while maintaining independent overvoltage protection per path |
| Integrated USB OTG Back-Power | Provides 5V/1.4A from battery to VBUS without external boost IC or MOSFETs - reduces BOM count and layout area |
| JEITA-Compliant NTC ADC | 7-bit ratiometric measurement with programmable hot/cold/fault thresholds - enables safe charging across industrial temperature ranges |
| Low Quiescent Drain Current | 0.6µA in ship-and-store mode (DVCC = 0V) - extends shelf life of battery-powered devices before first use |
Applications
| Tablet PCs | Ultra Mobile PCs |
|---|---|
Use Scenario: Portable computing device with dual-input charging (USB-C and barrel jack) and long battery runtime requirements. IC Role / Device Role / Timing Role: Dual-input power manager and high-current Li-ion charger managing simultaneous VBUS and wall adapter inputs while delivering stable 4.35V system rail. Use Value: Enables 3.5A fast charging from wall adapter while maintaining USB compliance during host connection - reducing charge time by >40% vs. 500mA-only solutions. | Use Scenario: Fanless x86-based handheld with thermal constraints and need for instant-on resume from deep sleep. IC Role / Device Role / Timing Role: PowerPath™ controller providing seamless switchover between input sources and battery backup with <100ns interruption. Use Value: Maintains 3.5V minimum VOUT during battery voltage sag below 3.3V - prevents OS crash during cold-start or low-battery wake-up. |
| Digital Cameras & GPS Units | Portable Medical Devices |
Use Scenario: Battery-powered imaging device requiring rapid recharge between field deployments and accurate temperature-aware charging. IC Role / Device Role / Timing Role: JEITA-compliant battery conditioner using integrated NTC ADC to adjust charge voltage/current based on real-time thermistor readings. Use Value: Prevents lithium plating at low temperatures and overvoltage stress at high temperatures - extending cycle life beyond 500 cycles. | Use Scenario: FDA-cleared wearable monitor with strict safety requirements, long shelf life, and need for reliable low-power operation. IC Role / Device Role / Timing Role: Low-quiescent-power battery manager supporting ship-and-store mode (0.6µA drain) and fault-protected charging with thermal cutoff. Use Value: Ensures >10-year shelf life with minimal battery self-discharge - meeting ISO 13485 storage validation requirements. |
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) 4.5A charger; no wall adapter input path or PowerPath™ multiplexing; integrated LDO for system rail | Lacks dual-input priority selection, overvoltage protection, and USB OTG back-power - suitable only for USB-centric designs | Select when design uses USB-C PD only and requires lower cost; avoid when wall adapter support or battery-powered OTG is needed |
| MAX77818EWJ+T | 3.5A dual-input charger with I²C control but no integrated USB OTG regulator; requires external boost for VBUS back-power | Supports dual inputs and JEITA, but adds 3–5 mm² PCB area and 15–20mΩ conduction loss from external boost FET and inductor | Select when existing platform uses MAXIM ecosystem and can accommodate external OTG circuitry; prefer LTC4155EUFD#TRPBF for integrated simplicity |
Compared with BQ24195RGER and MAX77818EWJ+T, the LTC4155EUFD#TRPBF uniquely integrates dual-input priority multiplexing, USB OTG 5V generation, and PowerPath™ instant-on in a single 4mm × 5mm QFN - eliminating external components required by alternatives and reducing total solution size by ≥35%.
Availability
LTC4155EUFD#TRPBF is available at Aetrix Electronics and suitable for tablet PCs, ultra-mobile PCs, digital cameras, and portable medical devices requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term lifecycle support.
Supply support for LTC4155EUFD#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, Inc. (ADI) acquired Linear Technology in 2017 and continues its legacy of high-performance analog, mixed-signal, and power management ICs for demanding applications.
The LTC4155EUFD#TRPBF belongs to ADI's Power Management product line, designed specifically for portable electronics requiring intelligent dual-input power arbitration, high-efficiency battery charging, and USB OTG functionality in minimal footprint.
FAQ
What is the maximum battery charge current supported by the LTC4155EUFD#TRPBF?
The LTC4155EUFD#TRPBF supports a maximum regulated battery charge current of 3.57A in 100% mode with RPROG = 340Ω. This value is confirmed in the Electrical Characteristics table (ICHARGE(MAX) = 3.44/3.57/3.70A). The device achieves this using a synchronous step-down topology with 0.04Ω internal current sense resistance (RCHG) and peak inductor current clamping at 6.7A, enabling high-power density charging in thermally constrained portable designs. The LTC4155EUFD#TRPBF allows fine-grained adjustment down to 290mA in 15 discrete steps via I²C or PROG pin voltage.
How does the LTC4155EUFD#TRPBF implement USB On-The-Go functionality?
The LTC4155EUFD#TRPBF implements USB OTG by enabling reverse power flow from battery to VBUS when the ID pin is pulled low and the LOCKOUT_ID_PIN bit is cleared via I²C. In this mode, the internal PowerPath™ regulator operates in boost configuration, delivering 4.75–5.25V at up to 1.4A to VBUS without external components. The device monitors VBUS current via CLPROG2 and enforces overcurrent protection at 1.4A. This capability is validated in the Electrical Characteristics section under "Step-Up Mode PowerPath Switching Regulator" and requires no additional FETs, inductors, or diodes - distinguishing the LTC4155EUFD#TRPBF from alternatives requiring external boost circuits.
What package type and thermal characteristics does the LTC4155EUFD#TRPBF use?
The LTC4155EUFD#TRPBF uses a 28-lead 4mm × 5mm × 0.75mm plastic QFN package with exposed thermal pad (Pin 29). Its thermal resistance is θJA = 43°C/W when mounted on a standard 4-layer PCB with 1-in² copper pour under the exposed pad. This package enables high-power operation (up to 15W) in space-constrained portable devices while maintaining junction temperature within the specified –40°C to 125°C range. The exposed pad must be soldered to PCB ground for optimal thermal performance and EMI suppression - a requirement explicitly stated in the Package Description section of the datasheet.
Can the LTC4155EUFD#TRPBF support JEITA-compliant battery charging?
Yes, the LTC4155EUFD#TRPBF supports JEITA-compliant charging through its integrated 7-bit NTC thermistor ADC and I²C-programmable temperature thresholds. The device measures VNTC/VNTCBIAS ratio with kOFFSET = 0.113 V/V and kHIGH = 0.895 V/V, enabling precise ratiometric temperature calculation. JEITA thresholds (dTOO_COLD = 102 counts, dTOO_WARM = 41 counts, dHOT_FAULT = 19 counts) are configurable via I²C registers to dynamically adjust float voltage and charge current across temperature zones. This implementation is documented in the "Overtemperature Battery Conditioner" and "Thermistor Measurement System" sections of the datasheet, confirming full JEITA profile support without external components.
What are the key differences between CLPROG1 and CLPROG2 pins on the LTC4155EUFD#TRPBF?
CLPROG1 (Pin 5) is the primary input current limit programming pin used for non-USB applications (e.g., wall adapters), with a fixed 1.2V servo target and hCLPROG1 = 990 mA/mA. CLPROG2 (Pin 6) is the secondary pin supporting USB-compliant limits (100/500/900mA) and USB OTG output current control, with programmable hCLPROG2 ratios and 1.2V servo target. When shorted together at power-up, the LTC4155EUFD#TRPBF defaults to CLPROG2's 100mA USB mode for compliance. Their distinct roles are defined in the Pin Functions section: CLPROG1 prioritizes high-power flexibility, while CLPROG2 ensures regulatory adherence and bidirectional current control - both essential for mixed-input system design.
LTC4155EUFD#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)
LTC4155EUFD#TRPBF FAQ
1.How can I place an order for LTC4155EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4155EUFD#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 LTC4155EUFD#TRPBF reliable?
The price and inventory of LTC4155EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4155EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4155EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4155EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4155EUFD#TRPBF?
LTC4155EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4155EUFD#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 LTC4155EUFD#TRPBF?
For technical support, including LTC4155EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4155EUFD#TRPBF requirements.
6.How does Aetrix verify that LTC4155EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4155EUFD#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 LTC4155EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4155EUFD#TRPBF?
All LTC4155EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4155EUFD#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 LTC4155EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LTC4155EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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