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Analog Devices Inc. LTC4162EUFD-FADM#TRPBF
- Part No.:
- LTC4162EUFD-FADM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4162EUFD-FADM#TRPBF.pdf
- Description:
- IC BAT LIFEPO4/LI-ION 1-9C 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,716
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Product details
Overview
LTC4162EUFD-FADM#TRPBF from Analog Devices is a 35V/3.2A synchronous step-down LiFePO₄ battery charger with PowerPath™ management and I²C telemetry. It supports 1–9-cell stacks, delivers up to 3.2A charge current, features MPPT for solar inputs, and enables instant-on operation under low-battery conditions in rugged portable medical and industrial devices.
For engineers reviewing the LTC4162EUFD-FADM#TRPBF datasheet, LTC4162EUFD-FADM#TRPBF pinout, LTC4162EUFD-FADM#TRPBF application, or LTC4162EUFD-FADM#TRPBF equivalent, key selection criteria include input voltage range (4.5V–35V), I²C-configurable charge parameters, integrated 16-bit telemetry (VBAT, IBAT, RBAT, TBAT, TDIE, VIN, IIN, VOUT), MPPT enablement, and thermal regulation with JEITA compliance.
Technical Context
The LTC4162EUFD-FADM#TRPBF implements a constant-frequency (1.5MHz typical) synchronous buck topology with four independent regulation loops: battery voltage, charge current, input current, and input voltage. Its PowerPath architecture decouples VOUT from battery voltage using dual external N-channel MOSFETs (INFET and BATFET), enabling system load operation even with discharged or missing batteries.
Telemetry is performed via a 16-bit A/D subsystem measuring eight analog channels-including differential CSP–CSN (charge current), CLP–CLN (input current), BATSENS+, NTC, RT, VIN, VOUT, and die temperature-with programmable resolution, offset, and span error correction accessible over I²C. MPPT is implemented using global sweep and multi-peak acquisition algorithms optimized for solar panel inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 35V - supports wall adapters, USB-C PD, solar panels, and backplanes without external pre-regulation. |
| Charge Current | Up to 3.2A - configurable via I²C or external sense resistor (RSNSB), enabling rapid charging of 1–9 LiFePO₄ cells. |
| Switching Frequency | 1.5MHz typical (RT-pin adjustable) - allows compact magnetics and high efficiency across wide input/output ratios. |
| Telemetry Resolution | 16-bit ADC with per-channel LSB resolution: 0.32µV/LSB (IBAT), 0.32µV/LSB (IIN), 25mV/LSB (VIN/VOUT) - enables precise battery health monitoring and system diagnostics. |
| MPPT Enablement | Enabled by default in FADM variant - performs light-to-dark tracking and multi-peak acquisition for optimal solar harvest under partial shading. |
| Operating Junction Temp | −40°C to +125°C - qualified for industrial handhelds, rugged notebooks, and medical instruments with extended thermal margins. |
| Package | 28-pin 4mm × 5mm × 0.75mm QFN with exposed AGND pad - thermally enhanced for >3A continuous operation with θJC = 3.4°C/W. |
Pinout & Package
The LTC4162EUFD-FADM#TRPBF is housed in a thermally enhanced 28-pin 4mm × 5mm × 0.75mm plastic QFN (UFD package) with exposed AGND pad (Pin 29) requiring solder connection to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (1) | High-side gate drive bias | Provides pumped voltage relative to SW for internal N-channel switch; requires 22nF ceramic capacitor to SW. |
| VIN (7) | Input supply detection & INFET pump | Detects valid input presence and activates INFET charge pump to power VOUTA and initiate charging sequence. |
| CLP/CLN (5/4) | Input current sensing terminals | Differential pair for measuring and regulating input current (IIN); supports MPPT and input priority logic. |
| CSP/CSN (21/20) | Charge current sensing terminals | Differential pair for measuring and servo-controlling battery charge current (IBAT) with 5-bit DAC resolution. |
| BATSENS+ (19) | Battery positive Kelvin sense | Kelvin-connected to battery anode for accurate voltage measurement and cell-count-based termination. |
| NTC/NTCBIAS (10/9) | Thermistor interface | Provides 1.2V bias and digitizes NTC voltage for JEITA-compliant temperature-controlled charging (β = 3490K). |
| SCL/SDA (13/14) | I²C serial interface | Open-drain bus pins referenced to DVCC (1.8V–5.5V); support 400kHz SMBus-compatible communication with PEC option. |
| CELLS0/CELLS1 (17/18) | Cell count configuration | Two-pin binary encoding (GND/INTVCC/VCC2P5 strapping) sets series cell count from 1 to 9 for voltage scaling and safety limits. |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ Management | Decouples VOUT from battery voltage using dual external NMOS (INFET/BATFET), enabling instant-on system startup with 0V battery or no battery installed. |
| I²C Telemetry System | 16-bit A/D subsystem reads VBAT, IBAT, RBAT (BSR), TBAT, TDIE, VIN, IIN, VOUT - all accessible via register-mapped I²C interface for real-time BMS integration. |
| MPPT Algorithm | Global sweep + multi-peak acquisition tracks maximum power point under dynamic irradiance and partial shading, increasing solar energy harvest by up to 25% vs fixed-voltage operation. |
| JEITA Temperature Control | Automatically adjusts charge voltage/current based on NTC-measured battery temperature using programmable hot/cold thresholds and hysteresis. |
| Input Undervoltage Charge Limit | Prevents excessive battery discharge during low-input conditions by reducing charge current when VIN–VBATSENS+ drops below 100–200mV threshold. |
Applications
| Medical Instruments | USB-C Power Delivery |
|---|---|
Use Scenario: Portable ultrasound and patient monitors requiring reliable battery operation across wide ambient temperatures and intermittent solar/wall charging. IC Role / Device Role / Timing Role: Primary battery charger and PowerPath manager that maintains uninterrupted system operation while optimizing LiFePO₄ health via JEITA and telemetry-driven charge profiling. Use Value: Enables 12+ hour runtime with fast recharge, eliminates brownouts during battery swap, and provides diagnostic data for predictive maintenance via I²C logs. | Use Scenario: Docking stations and mobile workstations negotiating variable USB-C PD input (5–20V) while charging multi-cell LiFePO₄ packs. IC Role / Device Role / Timing Role: Input-aware charger that prioritizes system load over battery charge when input current is constrained, ensuring stable VOUT during high-power CPU/GPU loads. Use Value: Prevents USB-C source overcurrent faults by dynamically limiting IIN while maintaining full system functionality-no forced throttling or shutdown. |
| Industrial Handhelds | Ruggedized Notebooks |
Use Scenario: Barcode scanners and field data collectors operating in warehouses with mixed power sources (dock chargers, solar, vehicle USB). IC Role / Device Role / Timing Role: Multisource power arbiter that selects optimal input (wall > solar > USB) and manages battery charge/discharge cycles with telemetry-backed state-of-charge estimation. Use Value: Extends field uptime by 40% through MPPT-enhanced solar harvesting and reduces calibration drift via on-chip RBAT (BSR) measurement. | Use Scenario: Military-grade notebooks deployed in vehicles and remote sites where input voltage varies widely (12–28V vehicle, 15V adapter, 24V PoE++). IC Role / Device Role / Timing Role: Wide-input battery charger with thermal regulation that sustains 3.2A charge current up to 80°C die temperature before gracefully derating. Use Value: Eliminates need for external thermal sensors or fan control logic; built-in die temperature telemetry feeds directly into OS power management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LiFePO₄ battery charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ25792RTWR | Supports Li-ion/LiPo only; no native LiFePO₄ voltage range or BSR measurement; lacks MPPT; 12-bit telemetry resolution. | Requires external voltage translation for LiFePO₄; unsuitable for solar-powered systems; limited battery health diagnostics. | Select only if migrating from Li-ion designs and adding external circuitry for LiFePO₄ compatibility and MPPT. |
| MAX77751EWJ+T | Fixed 3.6V output for 1-cell LiFePO₄ only; no I²C-adjustable voltage; no MPPT; supports only up to 2A charge current. | Not scalable beyond single-cell configurations; cannot support 2–9 cell stacks or solar input optimization. | Choose only for cost-sensitive, single-cell, non-solar applications where programmability and telemetry depth are secondary. |
Compared with BQ25792RTWR and MAX77751EWJ+T, the LTC4162EUFD-FADM#TRPBF uniquely combines 1–9 cell LiFePO₄ support, MPPT, 16-bit telemetry, and PowerPath in a single 4×5mm QFN-enabling compact, solar-ready, high-reliability portable systems without external compensation or firmware overhead.
Availability
LTC4162EUFD-FADM#TRPBF is available at Aetrix Electronics and suitable for medical instrumentation, USB-C PD docking stations, and rugged industrial handhelds requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC4162EUFD-FADM#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and power management markets.
The LTC4162 product line delivers highly integrated battery charging and PowerPath solutions for LiFePO₄-based portable systems, emphasizing telemetry-rich operation, multisource input flexibility, and robust thermal management for mission-critical applications.
FAQ
What distinguishes the LTC4162EUFD-FADM#TRPBF from other variants in the LTC4162-F family?
The LTC4162EUFD-FADM#TRPBF is the I²C-adjustable-voltage variant with MPPT enabled by default. Unlike fixed-voltage versions (e.g., FST, FFS), it supports programmable charge voltage from 3.4125V to 3.8V per cell via I²C registers. Its "M" suffix explicitly denotes factory-configured MPPT activation, eliminating the need for external configuration resistors or firmware initialization to engage solar tracking algorithms. This makes LTC4162EUFD-FADM#TRPBF ideal for solar-integrated designs requiring zero-touch deployment.
How does the PowerPath topology in the LTC4162EUFD-FADM#TRPBF enable instant-on operation?
The LTC4162EUFD-FADM#TRPBF uses dual external N-channel MOSFETs (INFET and BATFET) controlled independently to decouple VOUT from battery voltage. When VIN is present, INFET turns on to power VOUT directly from the input source-even if the battery is fully discharged or absent-allowing the system to boot immediately. Simultaneously, BATFET remains off until battery voltage reaches a safe level, preventing backfeed. This architecture ensures zero-delay system startup, a critical requirement for medical and industrial devices.
Can the LTC4162EUFD-FADM#TRPBF measure battery series resistance (RBAT) without external components?
Yes. The LTC4162EUFD-FADM#TRPBF integrates a Battery Series Resistance (BSR) measurement function that applies a known current pulse across the battery and measures the resulting voltage delta using its high-resolution 16-bit ADC on BATSENS+. This BSR value-reported as RBAT in ohms via I²C register 0x1A-is used internally for charge termination and health estimation and requires no external circuitry beyond standard Kelvin sensing. Measured resolution is 192.4µV/LSB with ±1% span error over 2V–3.8V.
What is the role of the RT pin on the LTC4162EUFD-FADM#TRPBF, and how is switching frequency set?
The RT pin on the LTC4162EUFD-FADM#TRPBF sets the switching frequency of the synchronous buck regulator by connecting an external resistor to GND. With RT = 63.4kΩ, the typical frequency is 1.5MHz (range: 1.4–1.6MHz). This resistor determines oscillator timing and directly impacts inductor size, efficiency, and EMI profile. Frequency can also be overridden by an external clock applied to the SYNC pin, allowing synchronization to system clocks or noise-sensitive bands-useful in tightly regulated EMI environments.
Does the LTC4162EUFD-FADM#TRPBF support JEITA-compliant charging, and how is it configured?
Yes. The LTC4162EUFD-FADM#TRPBF supports full JEITA temperature-controlled charging using its integrated NTC interface (NTC/NTCBIAS pins) and programmable hot/cold thresholds. Configuration is done via I²C registers: hot limit (0x22), cold limit (0x23), hysteresis (0x24), and charge enable/disable flags (0x25). When battery temperature exceeds the hot threshold, charge voltage and current are reduced; below the cold threshold, charging halts entirely. This behavior is automatic and requires no host MCU intervention once configured.
LTC4162EUFD-FADM#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
- Function:
- Battery Monitor
- Battery Chemistry:
- LiFePO4/Li-ion
- Number of Cells:
- 1 ~ 9
- Fault Protection:
- Over Current, Over Temperature, Over Voltage
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC4162EUFD-FADM#TRPBF FAQ
1.How can I place an order for LTC4162EUFD-FADM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4162EUFD-FADM#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 LTC4162EUFD-FADM#TRPBF reliable?
The price and inventory of LTC4162EUFD-FADM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4162EUFD-FADM#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4162EUFD-FADM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4162EUFD-FADM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4162EUFD-FADM#TRPBF?
LTC4162EUFD-FADM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4162EUFD-FADM#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 LTC4162EUFD-FADM#TRPBF?
For technical support, including LTC4162EUFD-FADM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4162EUFD-FADM#TRPBF requirements.
6.How does Aetrix verify that LTC4162EUFD-FADM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4162EUFD-FADM#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 LTC4162EUFD-FADM#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4162EUFD-FADM#TRPBF?
All LTC4162EUFD-FADM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4162EUFD-FADM#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 LTC4162EUFD-FADM#TRPBF part is unused and in its original packaging.
Return procedure for LTC4162EUFD-FADM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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