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Analog Devices Inc. LTC4162IUFD-LAD#TRPBF
- Part No.:
- LTC4162IUFD-LAD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4162IUFD-LAD#TRPBF.pdf
- Description:
- IC BATT MON LI-ION 1-8CELL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,468
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Product details
Overview
LTC4162IUFD-LAD#TRPBF 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 16-bit voltage/current/temperature/resistance measurement, and enables instant-on operation under low-battery or no-battery conditions in portable medical instruments and ruggedized notebooks.
For engineers reviewing the LTC4162IUFD-LAD#TRPBF datasheet, LTC4162IUFD-LAD#TRPBF pinout, LTC4162IUFD-LAD#TRPBF application, or LTC4162IUFD-LAD#TRPBF equivalent, key selection criteria include I²C-adjustable charge voltage (3.8125–4.2V per cell), MPPT-disabled configuration, –40°C to 125°C industrial temperature grade, and 28-pin 4mm × 5mm QFN package with exposed thermal pad.
Technical Context
The LTC4162IUFD-LAD#TRPBF implements a constant-frequency 1.5MHz synchronous buck regulator with four independent regulation loops: battery voltage, battery charge current, input current, and input voltage. Its PowerPath topology decouples VOUT from battery voltage using external INFET and BATFET MOSFETs, enabling system power-up before battery charging begins.
Telemetry is handled by a 16-bit ADC subsystem measuring VBAT, IBAT, RBAT (via BSR), TBAT (NTC), TDIE, VIN, IIN, and VOUT - all accessible via I²C. Charge voltage is programmable over I²C in 12.5mV steps across 3.8125–4.2V per cell; this variant (LAD suffix) has MPPT disabled, distinguishing it from LADM variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 35V - supports wide-input sources including USB-C PD, wall adapters, and industrial backplanes without external pre-regulation. |
| Max Charge Current | 3.2A - set via external sense resistor (RSNSB); enables fast charging of multi-cell Li-ion packs in space-constrained applications. |
| Cell Count Support | 1–8 cells - configured via CELLS0/CELLS1 pins; allows single-part-number flexibility across diverse battery configurations. |
| Telemetry Resolution | 16-bit ADC for VBAT, IBAT, VIN, IIN, VOUT, NTC, die temp - provides high-precision state-of-charge and health monitoring for safety-critical systems. |
| Switching Frequency | 1.5MHz (typ) - set by RT pin resistor; enables use of small, low-profile inductors and reduces output ripple in compact layouts. |
| Operating Temp | –40°C to 125°C - qualified for industrial and extended-temperature embedded applications including medical handhelds and rugged notebooks. |
| I²C Address | 0b1101000 (0x68) - fixed 7-bit slave address; supports standard-mode (400kHz) communication for real-time parameter readback and configuration. |
Pinout & Package
The LTC4162IUFD-LAD#TRPBF is housed in a thermally enhanced 28-pin 4mm × 5mm × 0.75mm plastic QFN package (UFD) with exposed AGND pad (Pin 29) requiring PCB soldering for thermal and electrical integrity. θJA = 43°C/W, θJC = 3.4°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (1) | High-side gate drive bias | Provides pumped voltage relative to SW for efficient top-FET switching; requires 22nF ceramic cap between BOOST and SW. |
| VIN (7) | Input supply detection & INFET pump | Detects valid input presence and activates INFET charge pump to enable PowerPath handover; bypassed with 0.1µF ceramic cap. |
| CSP/CSN (21/20) | Charge current sense inputs | Differential pair measuring (VCSP–VCSN)/RSNSB; sets precise 1–32mV servo range for 3.2A max charge current control. |
| CLP/CLN (5/4) | Input current sense inputs | Differential pair measuring (VCLP–VCLN)/RSNSI; regulates input current limit independently of battery charging. |
| BATSENS+ (19) | Kelvin battery voltage sense | Direct Kelvin connection to battery anode; enables accurate voltage regulation and JEITA-compliant temperature-controlled charging. |
| NTC/NTCBIAS (10/9) | Thermistor interface | 1.2V bias on NTCBIAS drives NTC thermistor; digitized reading supports battery temperature qualification and charge suspension at extremes. |
| SCL/SDA (13/14) | I²C serial interface | Open-drain, DVCC-referenced bus pins supporting 400kHz SMBus-compatible communication for telemetry and configuration. |
| CELLS0/CELLS1 (17/18) | Cell count configuration | Two-pin binary encoding (GND/INTVCC/VCC2P5 strapping) selects 1–8 series cells; determines VCHARGE scaling and protection thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ Management | Decouples system output (VOUT) from battery voltage using external INFET/BATFET, enabling instant-on operation even with deeply discharged or missing battery. |
| I²C-Adjustable Charge Voltage | Programmable 3.8125–4.2V per cell in 12.5mV steps via register writes - eliminates hardware changes when adapting to different Li-ion chemistries or aging profiles. |
| 16-Bit Telemetry System | Simultaneous high-resolution measurement of VBAT, IBAT, RBAT (BSR), TBAT, TDIE, VIN, IIN, VOUT - enables accurate state-of-health estimation and predictive maintenance. |
| Input Undervoltage Charge Limit | Configurable differential UVLO (100–200mV) between VIN and BATSENS+ prevents charging from weak sources while preserving system load priority. |
| JEITA Temperature Control | Automatically adjusts charge voltage/current based on NTC readings across five temperature zones - ensures safe charging across industrial operating ranges. |
Applications
| Medical Instruments | USB-C Power Delivery |
|---|---|
Use Scenario: Portable ultrasound or infusion pumps requiring reliable battery backup and real-time health monitoring during clinical use. IC Role / Device Role / Timing Role: Primary battery charger and PowerPath manager that maintains uninterrupted system operation during AC-to-battery transitions. Use Value: Instant-on capability and 16-bit telemetry enable rapid device readiness and battery state visibility critical for patient safety compliance. | Use Scenario: Docking stations or monitors accepting USB-C PD input while charging internal multi-cell Li-ion batteries. IC Role / Device Role / Timing Role: Input-aware charger that dynamically allocates available PD power between system load and battery charging using prioritized input current limiting. Use Value: Input current limit loop ensures USB-C source compliance while maximizing charge throughput - no renegotiation or protocol overhead required. |
| Industrial Handhelds | Ruggedized Notebooks |
Use Scenario: Barcode scanners or field test equipment deployed in extreme ambient temperatures (-40°C to 85°C). IC Role / Device Role / Timing Role: Temperature-robust charger implementing JEITA profile and die-temperature regulation to prevent thermal runaway during fast charging. Use Value: Built-in thermal regulation and wide-temp-grade operation eliminate need for external thermal sensors or firmware compensation logic. | Use Scenario: Military-spec or outdoor-use notebooks requiring hot-swap battery support and seamless AC/battery transitions. IC Role / Device Role / Timing Role: Dual-path power manager that powers system from either adapter or battery without brownout, while concurrently charging the attached pack. Use Value: Low-loss PowerPath architecture achieves <100mV VOUT droop during handover - avoids system reset or data loss during source switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multicell Li-ion charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4162IUFD-L42#TRPBF | Fixed 4.2V/cell charge voltage; no I²C voltage adjustment capability. | Suitable for standardized 3.7V nominal Li-ion cells where voltage tuning is unnecessary. | Select when firmware simplicity and guaranteed fixed termination voltage outweigh programmability needs. |
| BQ25792RTWR | TI part with integrated FETs, 1–5 cell support, and USB PD 3.1 compatibility; lacks BSR measurement and MPPT. | Better suited for cost-sensitive consumer devices with lower cell counts and no solar input requirement. | Choose for designs prioritizing BOM reduction over telemetry depth and multi-source flexibility. |
Compared with LTC4162IUFD-L42#TRPBF, the LTC4162IUFD-LAD#TRPBF offers runtime-configurable charge voltage essential for battery aging compensation and multi-chemistry support; versus BQ25792RTWR, it provides superior measurement resolution, wider cell count range, and dedicated solar MPPT capability - making it optimal for high-reliability industrial and medical platforms.
Availability
LTC4162IUFD-LAD#TRPBF is available at Aetrix Electronics and suitable for medical instrumentation, ruggedized notebooks, and industrial handhelds requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grading.
Supply support for LTC4162IUFD-LAD#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision, industrial, automotive, and communications markets.
The LTC4162 product line delivers advanced battery management ICs with integrated PowerPath, telemetry, and multi-source optimization - designed specifically for mission-critical portable equipment demanding reliability, accuracy, and thermal resilience.
FAQ
What is the primary function of the LTC4162IUFD-LAD#TRPBF in a battery-powered system?
The LTC4162IUFD-LAD#TRPBF serves as a synchronous step-down battery charger and PowerPath manager. It regulates charging of 1–8-cell Li-ion/polymer batteries from 4.5V–35V sources while simultaneously powering the system load through a low-loss path - enabling instant-on operation even with zero battery voltage. The LTC4162IUFD-LAD#TRPBF integrates telemetry, JEITA control, and I²C configurability to support safety-critical and industrial applications.
How does the LTC4162IUFD-LAD#TRPBF differ from the LADM variant?
The LTC4162IUFD-LAD#TRPBF disables maximum power point tracking (MPPT) for solar inputs, whereas the LTC4162IUFD-LADM#TRPBF enables MPPT. Both share identical pinout, package, temperature grade, and I²C-adjustable voltage capability. The LAD version is intended for wall adapter, USB-C PD, or backplane-powered systems where MPPT is unnecessary - simplifying design and eliminating MPPT-related configuration registers.
What external components are mandatory for basic operation of the LTC4162IUFD-LAD#TRPBF?
Mandatory external components for the LTC4162IUFD-LAD#TRPBF include: (1) CSP/CSN sense resistor (RSNSB) for charge current setting, (2) CLP/CLN sense resistor (RSNSI) for input current limiting, (3) BOOST-to-SW 22nF ceramic capacitor, (4) INTVCC-to-GND 4.7µF ceramic capacitor, (5) VOUT-to-PGND 10µF ceramic capacitor, and (6) NTC thermistor with matching bias resistor. The RT resistor sets switching frequency and is required for stable operation.
Can the LTC4162IUFD-LAD#TRPBF operate without a battery connected?
Yes, the LTC4162IUFD-LAD#TRPBF supports true instant-on operation with no battery or a fully discharged battery. Its PowerPath architecture uses external INFET and BATFET MOSFETs to route input power directly to VOUT, allowing the host system to power up immediately. Battery charging only initiates once valid input and battery presence conditions are met - confirmed via BATSENS+ and VIN monitoring circuits within the LTC4162IUFD-LAD#TRPBF.
What telemetry data is accessible via I²C on the LTC4162IUFD-LAD#TRPBF?
The LTC4162IUFD-LAD#TRPBF provides 16-bit resolution telemetry for eight parameters via I²C: battery voltage (VBAT), battery current (IBAT), input voltage (VIN), input current (IIN), system output voltage (VOUT), die temperature (TDIE), battery temperature (TBAT via NTC), and battery series resistance (RBAT via BSR calculation). All values are factory-calibrated and readable in real time without interrupting charging or system operation.
LTC4162IUFD-LAD#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:
- 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)
LTC4162IUFD-LAD#TRPBF FAQ
1.How can I place an order for LTC4162IUFD-LAD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4162IUFD-LAD#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 LTC4162IUFD-LAD#TRPBF reliable?
The price and inventory of LTC4162IUFD-LAD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4162IUFD-LAD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4162IUFD-LAD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4162IUFD-LAD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4162IUFD-LAD#TRPBF?
LTC4162IUFD-LAD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4162IUFD-LAD#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 LTC4162IUFD-LAD#TRPBF?
For technical support, including LTC4162IUFD-LAD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4162IUFD-LAD#TRPBF requirements.
6.How does Aetrix verify that LTC4162IUFD-LAD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4162IUFD-LAD#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 LTC4162IUFD-LAD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4162IUFD-LAD#TRPBF?
All LTC4162IUFD-LAD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4162IUFD-LAD#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 LTC4162IUFD-LAD#TRPBF part is unused and in its original packaging.
Return procedure for LTC4162IUFD-LAD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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