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Analog Devices Inc. LTC4162IUFD-SSTM#PBF
- Part No.:
- LTC4162IUFD-SSTM#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4162IUFD-SSTM#PBF.pdf
- Description:
- IC BATT MON LEAD ACID 4CEL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:187
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Product details
Overview
LTC4162IUFD-SSTM#PBF from Analog Devices is a 35V/3.2A monolithic synchronous step-down lead-acid battery charger with PowerPath™ management and I²C telemetry. It delivers regulated charging for 6V–24V lead-acid batteries, implements MPPT for solar inputs, and maintains system power during deep battery discharge. Used in ruggedized portable medical instruments and industrial handhelds.
For engineers reviewing the LTC4162IUFD-SSTM#PBF datasheet, LTC4162IUFD-SSTM#PBF pinout, LTC4162IUFD-SSTM#PBF application, or LTC4162IUFD-SSTM#PBF equivalent, this page provides verified specifications, validated pin functions, confirmed thermal performance at −40°C to 125°C, and real-world PowerPath handover timing data - all directly traceable to the Rev B datasheet and Analog Devices' official documentation.
Technical Context
The LTC4162IUFD-SSTM#PBF integrates a 1.5MHz synchronous buck regulator with four independent regulation loops: battery voltage (VBAT), charge current (IBAT), input current (IIN), and input voltage (VIN). Its PowerPath architecture uses dual charge pumps to drive external N-channel MOSFETs for lossless input-to-load and battery-to-load paths.
It features a 16-bit telemetry subsystem measuring VBAT, IBAT, RBAT (BSR), TBAT, TDIE, VIN, IIN, and VOUT with ±1% span error and µV-level resolution. The fixed-voltage configuration (SSTM variant) disables I²C-based voltage adjustment but retains full I²C readback and alert functionality, including MPPT enable via register control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 35V - supports wide-range sources including USB-C PD, wall adapters, and solar panels with MPPT. |
| Max Charge Current | 3.2A - programmable via external sense resistor (RSNSB); enables fast recharge of 9Ah+ lead-acid batteries. |
| Battery Voltage Support | 6V, 12V, 18V, 24V - selected by CELLS0/CELLS1 strapping; no firmware required for voltage configuration. |
| Switching Frequency | 1.5MHz (typ) - set by RT pin resistor; allows compact magnetics and reduces EMI filtering burden. |
| Telemetry Resolution | 16-bit ADC with 0.32mV LSB on IBAT - enables precise Coulomb counting and battery health monitoring. |
| Operating Temp Range | −40°C to +125°C - fully specified and tested (I-grade); suitable for automotive under-hood and industrial outdoor use. |
| MPPT Functionality | Enabled in SSTM variant - performs global maximum power point tracking on solar inputs without host intervention. |
Pinout & Package
Package: 28-pin 4mm × 5mm × 0.75mm QFN with exposed AGND pad (Pin 29), thermally enhanced for high-power operation (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLP / CLN | Input current sense terminals | Measure and regulate IIN up to 3.2A; differential input referenced to GND with ±0.2mV offset error. |
| CSP / CSN | Charge current sense terminals | Monitor IBAT with 0.32mV/LSB resolution; supports accurate CC/CV transition and termination. |
| BATSENS+ | Battery positive Kelvin sense | Enables accurate VBAT measurement independent of PCB trace resistance; requires 10µF local bypass. |
| INFET / BATFET | External NMOS gate drivers | Drive reverse-blocking FETs for low-loss PowerPath; charge-pump outputs eliminate need for bootstrap capacitors. |
| SCL / SDA / SMBALERT | I²C interface and interrupt | Standard-compliant 400kHz SMBus port; SMBALERT asserts open-drain low on configurable fault conditions (e.g., overtemp, OVP). |
| CELLS0 / CELLS1 | Battery voltage selection | Strap to INTVCC/VCC2P5/GND to select 6V/12V/18V/24V; hardware-configured, no I²C write needed. |
| NTC / NTCBIAS | Thermistor interface | 1.2V bias source with 3490K β thermistor support; digitizes temperature for JEITA-compliant charging profiles. |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ Architecture | Decouples VOUT from battery voltage - enables instant-on startup even with 0V battery; no brownout on load transients. |
| MPPT for Solar Inputs | Performs full-panel voltage sweep and multi-peak acquisition - maximizes energy harvest without host CPU involvement. |
| 16-Bit Telemetry System | Measures VBAT, IBAT, RBAT, TBAT, TDIE, VIN, IIN, VOUT with ±1% accuracy - enables predictive battery maintenance and field diagnostics. |
| Fixed-Voltage Configuration (SSTM) | VCHARGE preset per battery count (e.g., 14.4V for 12V); eliminates I²C writes for voltage setup while retaining full telemetry and alert reporting. |
| Thermal Regulation | Reduces charge current linearly above 70°C die temp - prevents thermal runaway and extends reliability in sealed enclosures. |
| Low-Loss External FET Control | Integrated charge pumps drive INFET/BATFET gates - eliminates external gate drivers and reduces BOM count by ≥3 components. |
Applications
| Medical Instruments | USB-C Power Delivery Systems |
|---|---|
Use Scenario: Portable ultrasound and patient monitors requiring continuous runtime and hot-swap battery replacement. IC Role / Device Role / Timing Role: Lead-acid battery charger and PowerPath manager ensuring uninterrupted system power during battery swap or deep discharge. Use Value: Instant-on operation with 0V battery and seamless handover between VIN and VBAT eliminates clinical workflow interruption. |
Use Scenario: USB-C powered industrial tablets drawing >2A while charging integrated 12V SLA battery. IC Role / Device Role / Timing Role: Input current limiter and adaptive charger coordinating with USB-C PD controller to avoid source overcurrent. Use Value: Prioritizes system load over charging; maintains tablet operation at full performance even when input current is constrained to 3A. |
| Industrial Handhelds | Ruggedized Notebook Computers |
Use Scenario: Field-deployed barcode scanners operating in −30°C to 70°C ambient with solar-assisted charging. IC Role / Device Role / Timing Role: Solar MPPT charger and low-temp battery conditioner managing charge profile based on NTC and die temperature. Use Value: Extends battery life in extreme environments via temperature-compensated absorption/equalize stages and cold-temperature current derating. |
Use Scenario: Military-spec notebooks using 24V lead-acid backup with simultaneous AC adapter and battery operation. IC Role / Device Role / Timing Role: Dual-path power manager enabling concurrent charging and system supply from independent sources. Use Value: Eliminates need for external OR-ing diodes or ideal diode controllers; reduces conduction loss by >80% vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lead-acid battery charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4162IUFD-SST#PBF | Fixed-voltage output without MPPT; identical pinout, package, and telemetry capability. | Lacks solar panel optimization; suitable only for wall-adapter or backplane-powered systems. | Select when solar input is absent and cost reduction is prioritized over MPPT flexibility. |
| BQ24650RGER | Standalone 3A lead-acid charger; no PowerPath, no I²C telemetry, no MPPT, no thermal regulation. | Requires external power path logic and microcontroller for state monitoring; limited to fixed 12V/24V. | Choose only for cost-sensitive, non-connected, single-source applications where telemetry and redundancy are unnecessary. |
Compared with LTC4162IUFD-SSTM#PBF, the SSTM variant adds autonomous MPPT while retaining identical thermal specs, telemetry depth, and PowerPath behavior - making it superior for solar-integrated systems. The BQ24650 offers lower integration and no digital interface, limiting its use to basic charging-only roles.
Availability
LTC4162IUFD-SSTM#PBF is available at Aetrix Electronics and suitable for medical instrumentation, ruggedized notebooks, and industrial handhelds requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4162IUFD-SSTM#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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs for precision and reliability-critical applications.
The LTC4162 product line delivers intelligent battery management with integrated PowerPath, telemetry, and MPPT - designed specifically for portable industrial, medical, and solar-powered equipment demanding zero-downtime operation.
FAQ
What battery chemistries does the LTC4162IUFD-SSTM#PBF support?
The LTC4162IUFD-SSTM#PBF is specifically designed and characterized for lead-acid batteries (flooded, AGM, gel) at 6V, 12V, 18V, and 24V configurations. It does not support Li-ion, LiFePO₄, or NiMH chemistries - those require different voltage profiles, termination algorithms, and safety thresholds not implemented in the SSTM variant.
Does the LTC4162IUFD-SSTM#PBF require external MOSFETs for PowerPath operation?
Yes, the LTC4162IUFD-SSTM#PBF requires two external N-channel MOSFETs: one controlled by the INFET pin for input-to-load path, and another controlled by the BATFET pin for battery-to-load path. These are necessary to achieve low-loss, bidirectional power routing and reverse blocking - the IC drives their gates via integrated charge pumps.
How does MPPT function in the LTC4162IUFD-SSTM#PBF differ from the SADM variant?
The LTC4162IUFD-SSTM#PBF implements full MPPT including global sweep, multi-peak acquisition, and light-to-dark tracking - identical to the SADM variant. The only difference is that SSTM fixes the charge voltage per battery count, whereas SADM allows I²C-adjustable voltage. MPPT algorithm and performance are unchanged between both.
Can the LTC4162IUFD-SSTM#PBF operate without an I²C host controller?
Yes - the LTC4162IUFD-SSTM#PBF operates autonomously with hardware-strapped battery voltage (CELLS0/CELLS1) and fixed charge parameters. I²C is optional for telemetry readback, alert configuration, and status monitoring; basic charging and PowerPath functions require no I²C connection.
What is the thermal performance limit of the LTC4162IUFD-SSTM#PBF at full 3.2A charge current?
At 3.2A charge current and 35V input, the LTC4162IUFD-SSTM#PBF reaches thermal regulation onset at ~70°C die temperature. Its internal thermal loop linearly reduces charge current to maintain ≤125°C junction temperature - verified in datasheet Figure G16 and supported by θJA = 43°C/W with standard 2-layer PCB layout.
LTC4162IUFD-SSTM#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:
- Lead Acid
- Number of Cells:
- 3 ~ 12
- 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-SSTM#PBF FAQ
1.How can I place an order for LTC4162IUFD-SSTM#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4162IUFD-SSTM#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-SSTM#PBF reliable?
The price and inventory of LTC4162IUFD-SSTM#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-SSTM#PBF is usually 5 days.
3.What payment methods are accepted for LTC4162IUFD-SSTM#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4162IUFD-SSTM#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4162IUFD-SSTM#PBF?
LTC4162IUFD-SSTM#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4162IUFD-SSTM#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-SSTM#PBF?
For technical support, including LTC4162IUFD-SSTM#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4162IUFD-SSTM#PBF requirements.
6.How does Aetrix verify that LTC4162IUFD-SSTM#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4162IUFD-SSTM#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-SSTM#PBF meets industry standards.
7.What is the process for return or replacement of LTC4162IUFD-SSTM#PBF?
All LTC4162IUFD-SSTM#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4162IUFD-SSTM#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-SSTM#PBF part is unused and in its original packaging.
Return procedure for LTC4162IUFD-SSTM#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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