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Analog Devices Inc. LTC4162EUFD-LADM#PBF
- Part No.:
- LTC4162EUFD-LADM#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4162EUFD-LADM#PBF.pdf
- Description:
- IC BATT MON LI-ION 1-8CELL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:243
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Product details
Overview
LTC4162EUFD-LADM#PBF from Analog Devices is a 35V/3.2A synchronous step-down lithium-ion/polymer battery charger with PowerPath™ management and I²C telemetry. It supports 1–8-cell stacks, delivers up to 3.2A charge current, features MPPT for solar inputs, and enables instant-on operation even with deeply discharged or missing batteries - used in ruggedized portable electronics requiring autonomous power path arbitration and precision battery health monitoring.
For engineers reviewing the LTC4162EUFD-LADM#PBF datasheet, LTC4162EUFD-LADM#PBF pinout, LTC4162EUFD-LADM#PBF application, or LTC4162EUFD-LADM#PBF equivalent, key selection criteria include verified MPPT enablement, 16-bit telemetry resolution (VBAT, IBAT, RBAT, TBAT, TDIE), I²C-adjustable charge voltage, and thermal regulation with die temperature sensing - all within a 28-pin 4mm × 5mm QFN package rated for –40°C to 125°C.
Technical Context
The LTC4162EUFD-LADM#PBF 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 external INFET/BATFET MOSFETs, enabling seamless source arbitration between wall adapters, backplanes, and solar panels.
Telemetry is acquired via a 16-bit ADC subsystem measuring VBATSENS+, VIN, VOUT, IBAT (via CSP/CSN), IIN (via CLP/CLN), NTC voltage, and die temperature - all accessible and configurable over a standard 400kHz I²C interface with SMBus ALERT support. MPPT is enabled by default in the -LADM variant and operates via dynamic input current limit adjustment based on panel voltage sweeps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 35V - supports wide-range sources including USB-C PD, industrial backplanes, and unregulated solar arrays. |
| Max Charge Current | 3.2A - programmable via 5-bit ICHARGE DAC (VCSP–CSN) with ±0.25mV offset error, enabling precise current control with external 10mΩ sense resistor. |
| Cell Count Support | 1–8 series Li-ion/Li-poly cells - configured via CELLS0/CELLS1 pins; each cell voltage range is independently validated per JEITA-compliant charging profiles. |
| Telemetry Resolution | 16-bit ADC for VBAT, IBAT, VIN, VOUT, NTC, and die temperature - provides <±1mV/±0.15µV LSB accuracy for battery resistance (RBAT) and state-of-charge modeling. |
| MPPT Enable Status | Enabled by default - distinguishes LTC4162EUFD-LADM#PBF from non-M variants; performs global sweep and multi-peak acquisition for solar optimization without host intervention. |
| Switching Frequency | 1.5MHz typical (RT = 63.4kΩ) - balances efficiency and EMI; duty cycle up to 99.5% supports low-VIN/high-VBAT conditions during PowerPath handover. |
| Operating Temp Range | –40°C to 125°C junction - qualified for industrial handhelds and medical instruments; thermal regulation reduces charge current above 70°C die temperature. |
Pinout & Package
The LTC4162EUFD-LADM#PBF is housed in a thermally enhanced 28-pin 4mm × 5mm × 0.75mm plastic QFN package (UFD) with exposed AGND pad (Pin 29) soldered to PCB for optimal thermal and analog grounding. Pin pitch is 0.5mm; PGND (Pins 23,24) and SW (Pins 25,26) are paralleled for high-current paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (25,26) | Switch node output | Drives external inductor; carries high-frequency pulsed current up to 4.5A peak; requires tight layout to minimize EMI and switching losses. |
| CSP / CSN (21,20) | Charge current sense terminals | Differential inputs for 16-bit IBAT measurement; referenced to BATSENS+; support Kelvin sensing for accurate current limiting at ±0.25mV offset. |
| CLP / CLN (5,4) | Input current sense terminals | Differential inputs for IIN regulation; enable MPPT and input priority logic; resolution 0.5mV/LSB with ±0.15mV offset error. |
| BATSENS+ (19) | Battery positive sense | Kelvin connection point for battery stack voltage; enables accurate per-cell voltage monitoring and JEITA compliance across 1–8 cells. |
| INFET (6) / BATFET (22) | External MOSFET gate drivers | Drive N-channel FETs for reverse-blocking PowerPath; INFET active when VIN > VBAT, BATFET active when VIN < VBAT - ensures seamless load powering. |
| SDA / SCL (14,13) | I²C bidirectional data/clock | Open-drain interface with DVCC-referenced thresholds; supports 400kHz SMBus; enables real-time telemetry readback and full configuration of charge parameters. |
| NTC / NTCBIAS (10,9) | Thermistor bias and sensing | Provides 1.2V bias for NTC thermistor; digitizes temperature with ±27m°C sigma noise; supports JEITA profile enforcement and thermal charge termination. |
| CELLS0 / CELLS1 (17,18) | Cell count configuration | Two-pin binary encoding (GND/VCC2P5/INTVCC) sets exact number of series cells (1–8); determines VCHARGE range and telemetry scaling factors. |
Key Features
| Feature | Design Value |
|---|---|
| MPPT with Global Sweep | Automatically identifies maximum power point on solar panels using voltage-based sweeping; no host firmware required - critical for off-grid portable systems. |
| PowerPath™ Instant-On | Decouples system VOUT from battery voltage; allows product startup at VBAT < 2.7V by sourcing VOUT directly from VIN through INFET - eliminates boot failure in low-battery scenarios. |
| 16-Bit Telemetry Engine | Simultaneously measures VBAT, IBAT, RBAT (via OC voltage), TBAT, TDIE, VIN, IIN, VOUT with sub-mV/mA resolution - enables cloud-connected battery health analytics and predictive maintenance. |
| I²C-Adjustable Charging | Full runtime reconfiguration of VCHARGE (3.8125–4.2V), ICHARGE (1–32mV range), termination algorithms, and alert thresholds - supports multi-chemistry battery packs. |
| JEITA Temperature Control | Hardware-enforced charging profile that reduces or halts charge current outside 0–45°C battery temperature range - prevents Li-ion thermal runaway in medical and industrial environments. |
Applications
| Medical Instruments | USB-C Power Delivery Systems |
|---|---|
Use Scenario: Portable ultrasound or infusion pump operating from dual-input (AC adapter + Li-ion pack) with strict battery safety requirements. IC Role / Device Role / Timing Role: Primary battery charger and PowerPath arbiter; manages charge/discharge sequencing, monitors RBAT degradation, and enforces JEITA limits in real time. Use Value: Enables FDA-compliant battery health logging via I²C telemetry and guarantees instant system power-up regardless of battery state - eliminating clinical workflow interruption. |
Use Scenario: Docking station supporting USB-C PD 3.1 with variable input (20V/5A) and simultaneous charging of 3-cell tablet battery. IC Role / Device Role / Timing Role: Input current-limited buck charger with VBUS-to-battery arbitration; prioritizes system load over charging when input current exceeds limit. Use Value: Delivers up to 3.2A charge current while maintaining stable 20V system rail - avoids PD contract renegotiation and supports fast-charging without compromising host functionality. |
| Industrial Handhelds | Ruggedized Notebooks |
Use Scenario: Barcode scanner or field meter deployed in extreme ambient temperatures (–30°C to 70°C) with solar-assisted charging in remote locations. IC Role / Device Role / Timing Role: Solar MPPT controller and battery manager; performs multi-peak acquisition under partial shading and regulates charge based on die temperature feedback. Use Value: Extends operational uptime by 40% in low-light conditions via adaptive MPPT and prevents thermal throttling during continuous scanning - validated across –40°C to 125°C junction range. |
Use Scenario: Military-grade notebook requiring hot-swap battery operation, battery health diagnostics, and compliance with MIL-STD-810H environmental testing. IC Role / Device Role / Timing Role: Dual-role PowerPath IC managing both AC adapter and battery as primary sources; provides real-time RBAT and cycle-count telemetry for logistics tracking. Use Value: Eliminates need for separate fuel-gauge IC; enables OEM-level battery lifecycle reporting and automatic charge algorithm adaptation based on measured internal resistance drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multicell lithium-ion battery charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ25792RTWR | 4.5V–32V input, 3.2A max charge, I²C-configurable, but lacks integrated MPPT and has only 12-bit telemetry resolution. | Requires external MPPT controller for solar use; lower telemetry fidelity limits battery health modeling accuracy. | Select when cost sensitivity outweighs solar autonomy and high-resolution diagnostics - suitable for AC-only industrial chargers. |
| LTC4162EUFD-L42M#PBF | Same package and pinout; fixed 4.2V per-cell charge voltage; identical MPPT, PowerPath, and telemetry capabilities. | No I²C voltage adjustment - eliminates runtime chemistry flexibility but simplifies firmware and reduces configuration risk. | Select for single-chemistry (standard Li-ion) deployments where deterministic charge voltage and reduced software overhead are priorities. |
Compared with BQ25792RTWR, LTC4162EUFD-LADM#PBF delivers superior solar autonomy and battery analytics; compared with LTC4162EUFD-L42M#PBF, it trades fixed-voltage simplicity for runtime adaptability across Li-ion, LiFePO₄, and custom chemistries - making it optimal for multi-platform OEM designs.
Availability
LTC4162EUFD-LADM#PBF is available at Aetrix Electronics and suitable for medical instrumentation, ruggedized notebooks, and industrial handhelds requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.
Supply support for LTC4162EUFD-LADM#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC4162 family was designed for intelligent, telemetry-rich battery management in portable and off-grid systems - emphasizing autonomous power path control, solar energy harvesting, and precision health monitoring for mission-critical applications.
FAQ
What distinguishes LTC4162EUFD-LADM#PBF from other variants in the LTC4162-L family?
The LTC4162EUFD-LADM#PBF is uniquely identified by its factory-programmed MPPT enablement and I²C-adjustable charge voltage capability. Unlike fixed-voltage variants (e.g., LTC4162EUFD-L42M#PBF), it supports runtime reconfiguration of VCHARGE between 3.8125V and 4.2V per cell. Its MPPT function is active by default and does not require register writes - confirmed in the Order Information table where "M" suffix denotes MPPT ON and "AD" denotes I²C Adjustable.
Does LTC4162EUFD-LADM#PBF support JEITA-compliant charging, and how is it implemented?
Yes, LTC4162EUFD-LADM#PBF supports hardware-enforced JEITA temperature-controlled charging. It uses the NTC/NTCBIAS pins to monitor battery temperature and automatically adjusts or halts charge current when TBAT falls outside 0°C–10°C (cold) or 45°C–50°C (hot) ranges. This behavior is independent of I²C configuration and is validated in the Electrical Characteristics table under "JEITA Temperature Controlled Charging" in the Features section.
What is the role of the INFET and BATFET pins on LTC4162EUFD-LADM#PBF, and are external MOSFETs required?
INFET (Pin 6) and BATFET (Pin 22) are gate drivers for external N-channel MOSFETs that implement reverse-blocking PowerPath control. INFET connects between VIN and VOUT; BATFET connects between battery and VOUT. Both are mandatory - the LTC4162EUFD-LADM#PBF does not integrate these switches. Their use enables true load-sharing, instant-on operation, and protection against reverse current flow during source transitions.
Can LTC4162EUFD-LADM#PBF measure battery internal resistance (RBAT), and how is it calculated?
Yes, LTC4162EUFD-LADM#PBF calculates RBAT using open-circuit voltage (OCV) measurements taken during brief charge pauses. It digitizes VBATSENS+ before and after a controlled current pulse applied via CSP/CSN, then computes RBAT = ΔVBAT / ΔIBAT. This 16-bit differential measurement is reported over I²C as a calibrated value in milliohms - confirmed in the Features list ("16-Bit Digital Telemetry System Monitors … RBAT") and Typical Performance Characteristic G20.
What package type and thermal characteristics apply to LTC4162EUFD-LADM#PBF?
LTC4162EUFD-LADM#PBF uses a 28-pin 4mm × 5mm × 0.75mm plastic QFN (UFD package) with exposed AGND pad (Pin 29). Its thermal metrics are θJA = 43°C/W and θJC = 3.4°C/W, with TJMAX = 125°C. The exposed pad must be soldered to a PCB thermal plane - specified in the Package Description section and validated in the Absolute Maximum Ratings table.
LTC4162EUFD-LADM#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1 ~ 8
- 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-LADM#PBF FAQ
1.How can I place an order for LTC4162EUFD-LADM#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4162EUFD-LADM#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 LTC4162EUFD-LADM#PBF reliable?
The price and inventory of LTC4162EUFD-LADM#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4162EUFD-LADM#PBF is usually 5 days.
3.What payment methods are accepted for LTC4162EUFD-LADM#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4162EUFD-LADM#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4162EUFD-LADM#PBF?
LTC4162EUFD-LADM#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4162EUFD-LADM#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 LTC4162EUFD-LADM#PBF?
For technical support, including LTC4162EUFD-LADM#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4162EUFD-LADM#PBF requirements.
6.How does Aetrix verify that LTC4162EUFD-LADM#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4162EUFD-LADM#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 LTC4162EUFD-LADM#PBF meets industry standards.
7.What is the process for return or replacement of LTC4162EUFD-LADM#PBF?
All LTC4162EUFD-LADM#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4162EUFD-LADM#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 LTC4162EUFD-LADM#PBF part is unused and in its original packaging.
Return procedure for LTC4162EUFD-LADM#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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