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Analog Devices Inc. LTC4162IUFD-LAD#PBF
- Part No.:
- LTC4162IUFD-LAD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4162IUFD-LAD#PBF.pdf
- Description:
- IC BATT MON LI-ION 1-8CELL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:226
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Product details
Overview
LTC4162IUFD-LAD#PBF from Analog Devices is a 35V/3.2A synchronous step-down lithium-ion/polymer battery charger IC 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 even with deeply discharged or missing batteries - used in ruggedized notebooks and industrial handhelds.
For engineers reviewing the LTC4162IUFD-LAD#PBF datasheet, LTC4162IUFD-LAD#PBF pinout, LTC4162IUFD-LAD#PBF application, or LTC4162IUFD-LAD#PBF equivalent, key selection criteria include I²C-adjustable charge voltage (3.8125–4.2V), MPPT-enabled solar input support, JEITA-compliant temperature charging, input current prioritization for system load, and thermal regulation with die temperature monitoring.
Technical Context
The LTC4162IUFD-LAD#PBF integrates a 1.5MHz synchronous buck regulator with four independent servo loops: VBAT, IBAT, IIN, and VIN. Its PowerPath topology decouples VOUT from battery voltage using external INFET/BATFET MOSFETs, enabling seamless source handover and system startup at <2.7V battery voltage.
Telemetry is implemented via a 16-bit ADC subsystem measuring VBAT, IBAT, RBAT (via BSR), TBAT (NTC), TDIE, VIN, IIN, and VOUT - all accessible over I²C. Charge voltage and current are set via 5-bit DACs; input current limit uses a 6-bit DAC; and switching frequency is programmable via RT resistor (1.4–1.6MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 35V - supports wall adapters, USB-C PD, and solar panels without external pre-regulation. |
| Charge Current | Up to 3.2A - adjustable via CSP–CSN sense voltage (1–32mV range) and external RSNSB resistor. |
| Cell Count Support | 1 to 8 series Li-ion/LiPo cells - configured via CELLS0/CELLS1 pins with three-state strapping. |
| I²C Interface | Standard-mode (400kHz), 7-bit address 0b1101000 - enables full configuration and real-time telemetry readback. |
| Telemetry Resolution | 16-bit ADC for VBAT, IBAT, VIN, VOUT, NTC, and die temperature - provides ±0.15mV offset error on current sensing. |
| Switching Frequency | 1.5MHz typical (1.4–1.6MHz) - set by RT-to-GND resistor; enables compact magnetics and low output ripple. |
| Thermal Protection | Dual thermal regulation: die temperature monitoring (±264.4°C offset, 0.0215°C/LSB) and programmable thermal foldback. |
Pinout & Package
The LTC4162IUFD-LAD#PBF is housed in a thermally enhanced 28-pin 4mm × 5mm × 0.75mm QFN package 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 internal NMOS switch; requires 22nF SW-to-BOOST capacitor. |
| VIN (7) | Input supply detection & INFET pump | Detects valid input presence; activates INFET charge pump to power VOUTA and initiate charging. |
| CSP / CSN (21 / 20) | Charge current sense inputs | Differential pair measuring (VCSP–VCSN)/RSNSB to regulate IBAT with 5-bit DAC servo loop. |
| CLP / CLN (5 / 4) | Input current sense inputs | Differential pair measuring (VCLP–VCLN)/RSNSI to regulate IIN with 6-bit DAC servo loop. |
| BATSENS+ (19) | Battery positive Kelvin sense | Kelvin connection to battery anode for accurate VBAT measurement and termination; requires 10µF bypass to GND. |
| NTC / NTCBIAS (10 / 9) | Thermistor interface | 1.2V bias applied to NTCBIAS; NTC pin digitizes thermistor voltage for JEITA-compliant charging control. |
| SCL / SDA (13 / 14) | I²C serial interface | Open-drain, DVCC-referenced; supports full register access for configuration, telemetry, and alert management. |
| INFET (6) / BATFET (22) | External MOSFET gate drivers | Drive external N-channel FETs to implement reverse-blocking PowerPath with low-loss handover. |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ Management | Decouples system VOUT from battery voltage, enabling instant-on operation even with 0V battery and seamless input-source handover. |
| MPPT for Solar Inputs | Input current limit loop dynamically adjusts to maximize power extraction from variable solar panel IV curves. |
| JEITA Temperature Charging | Configurable charge enable/disable thresholds per temperature zone (cold/hot) using NTC feedback - prevents unsafe charging. |
| 16-Bit Telemetry System | Simultaneously monitors VBAT, IBAT, RBAT (BSR), TBAT, TDIE, VIN, IIN, VOUT with <±1.25mV span error for closed-loop system diagnostics. |
| Input Priority for System Load | When IIN exceeds limit, excess current is diverted to VOUT before reducing charge current - ensures uninterrupted system operation. |
Applications
| Medical Instruments | USB-C Power Delivery |
|---|---|
Use Scenario: Portable ultrasound or infusion pumps requiring reliable battery backup and precise charge termination under varying ambient temperatures. IC Role / Device Role / Timing Role: Primary battery charger and PowerPath manager that maintains system uptime during AC loss and enforces JEITA-compliant charging profiles. Use Value: Eliminates need for separate fuel gauge or thermal management IC; 16-bit telemetry enables FDA-grade logging of battery health metrics. | Use Scenario: Docking stations or multi-port chargers negotiating variable USB-C PD voltages (5–20V) while charging integrated Li-ion packs. IC Role / Device Role / Timing Role: Input-voltage-agile charger that adapts to negotiated PD voltage and regulates charge current without compromising system rail stability. Use Value: Supports wide-input USB-C PD sources without external buck pre-regulator; I²C allows host MCU to coordinate charge rate with PD contract. |
| Industrial Handhelds | Ruggedized Notebooks |
Use Scenario: Barcode scanners or field tablets operating in extreme temperatures (-40°C to 85°C ambient) with hot-swap battery capability. IC Role / Device Role / Timing Role: Dual-role PowerPath controller managing both battery charging and system power delivery with cold-temperature charge suspension. Use Value: Enables safe operation across extended temperature range; ship mode reduces battery drain to ≤5µA when powered off. | Use Scenario: Military-spec notebooks requiring instant boot from dead battery and robust solar charging in remote deployments. IC Role / Device Role / Timing Role: High-efficiency 3.2A charger with MPPT and PowerPath that sustains CPU operation during battery replacement or deep discharge. Use Value: 1.5MHz switching minimizes EMI in dense layouts; exposed pad and low RDS(ON) switches reduce thermal stress in sealed enclosures. |
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 |
|---|---|---|---|
| BQ25792RTWR | 4.5–24V input, 3.2A max, I²C-configurable, but lacks MPPT and has no dedicated BSR measurement. | Targeted at USB-C PD and adapter-powered systems only; not optimized for solar or high-VIN industrial inputs. | Choose for cost-sensitive USB-C designs where MPPT and battery resistance telemetry are unnecessary. |
| MAX77751EWJ+T | Supports 3.5–24V input, 3A charge, includes integrated FETs (no external INFET/BATFET required), but limited to ≤4 cells and no BSR telemetry. | Best suited for space-constrained consumer devices; lacks PowerPath flexibility and high-VIN capability. | Prefer when board area is critical and external MOSFET control is not needed; verify cell count compatibility. |
Compared with BQ25792RTWR and MAX77751EWJ+T, the LTC4162IUFD-LAD#PBF uniquely combines 35V input tolerance, 1–8 cell support, MPPT, BSR-based battery health monitoring, and discrete PowerPath FET control - making it optimal for industrial, medical, and solar-charged platforms requiring field reliability and telemetry depth.
Availability
LTC4162IUFD-LAD#PBF is available at Aetrix Electronics and suitable for medical instruments, industrial handhelds, and ruggedized notebooks requiring stable component supply, long-term lifecycle assurance, and guaranteed -40°C to +125°C operation.
Supply support for LTC4162IUFD-LAD#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 (now part of Analog Devices, Inc., following merger with Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC4162 family was designed for high-reliability portable and industrial battery-powered systems requiring precision charging, comprehensive telemetry, and intelligent PowerPath management across wide input voltage ranges.
FAQ
What is the maximum supported battery cell count for the LTC4162IUFD-LAD#PBF?
The LTC4162IUFD-LAD#PBF supports 1 to 8 series-connected lithium-ion or lithium-polymer cells. Cell count is configured using the two-state strapping of CELLS0 and CELLS1 pins, with six valid combinations (1–6 cells) plus two additional states for 7- and 8-cell configurations as defined in the datasheet's Table 5. This enables flexible battery pack design without firmware changes.
Does the LTC4162IUFD-LAD#PBF support solar panel input with MPPT?
Yes, the LTC4162IUFD-LAD#PBF includes hardware-based Maximum Power Point Tracking (MPPT) for solar inputs. When enabled (via register bit), the input current limit loop dynamically adjusts to maintain operation at the solar panel's peak power point, even under rapidly changing irradiance. The MPPT algorithm operates independently of the host processor and requires no external components beyond the standard CLP/CLN sense resistor.
How does the PowerPath topology in the LTC4162IUFD-LAD#PBF enable instant-on operation?
The LTC4162IUFD-LAD#PBF implements PowerPath using dual external N-channel MOSFETs controlled by INFET and BATFET pins. When battery voltage is too low (<2.7V) or absent, the IC powers VOUT directly from VIN through the INFET path - bypassing the battery entirely. This allows the system to start immediately without waiting for battery recharge, a critical feature for mission-critical portable equipment.
What telemetry parameters can be read from the LTC4162IUFD-LAD#PBF via I²C?
The LTC4162IUFD-LAD#PBF provides real-time I²C readout of 16-bit measurements for VBAT, IBAT, VIN, IIN, VOUT, NTC voltage (for battery temperature), die temperature (TDIE), and battery series resistance (RBAT via BSR calculation). All values are factory-calibrated; voltage readings have ±25mV/LSB resolution and current readings ±0.32µV/LSB resolution, enabling high-fidelity battery health analytics.
Is the LTC4162IUFD-LAD#PBF pin-compatible with other versions in the LTC4162 family?
Yes, the LTC4162IUFD-LAD#PBF is pin-compatible with all variants in the LTC4162 family, including fixed-voltage (L40/L41/L42) and MPPT-enabled (LADM/L40M/L41M/L42M) versions. The UFD package, pin count, pin functions, and footprint are identical across all variants. Only the part marking and internal default register settings differ - allowing drop-in replacement for voltage or feature reconfiguration without PCB redesign.
LTC4162IUFD-LAD#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)
LTC4162IUFD-LAD#PBF FAQ
1.How can I place an order for LTC4162IUFD-LAD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4162IUFD-LAD#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 LTC4162IUFD-LAD#PBF reliable?
The price and inventory of LTC4162IUFD-LAD#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC4162IUFD-LAD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4162IUFD-LAD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4162IUFD-LAD#PBF?
LTC4162IUFD-LAD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4162IUFD-LAD#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 LTC4162IUFD-LAD#PBF?
For technical support, including LTC4162IUFD-LAD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4162IUFD-LAD#PBF requirements.
6.How does Aetrix verify that LTC4162IUFD-LAD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4162IUFD-LAD#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 LTC4162IUFD-LAD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4162IUFD-LAD#PBF?
All LTC4162IUFD-LAD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4162IUFD-LAD#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 LTC4162IUFD-LAD#PBF part is unused and in its original packaging.
Return procedure for LTC4162IUFD-LAD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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