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Analog Devices Inc. LTC4162EUFD-SADM#PBF
- Part No.:
- LTC4162EUFD-SADM#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4162EUFD-SADM#PBF.pdf
- Description:
- IC BATT MON LEAD ACID 4CEL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:962
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Product details
Overview
LTC4162EUFD-SADM#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 rugged portable medical instruments and industrial handhelds.
For engineers reviewing the LTC4162EUFD-SADM#PBF datasheet, LTC4162EUFD-SADM#PBF pinout, LTC4162EUFD-SADM#PBF application, or LTC4162EUFD-SADM#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed MPPT-on configuration, and real-world PowerPath handover behavior - all specific to the SADM variant.
Technical Context
The LTC4162EUFD-SADM#PBF integrates a 1.5MHz synchronous buck regulator with dual charge pumps driving external N-channel MOSFETs for low-loss PowerPath control. Its four independent regulation loops - VBAT, IBAT, IIN, and VIN - enable dynamic prioritization of system load over battery charging.
MPPT is enabled by default in the SADM variant via internal firmware configuration, using input voltage/current telemetry to sweep and lock onto solar panel maximum power points. The 16-bit telemetry subsystem digitizes VBAT, IBAT, RBAT, TBAT, TDIE, VIN, IIN, and VOUT with ±1% span accuracy and sub-mV resolution.
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 I²C or external sense resistor RSNSB (10mΩ typical), enabling full-rate charging of 9Ah+ lead-acid batteries. |
| Battery Voltage Support | 6V/12V/18V/24V - selected via CELLS0/CELLS1 strapping; SADM variant retains full I²C-adjustable voltage range. |
| Switching Frequency | 1.5MHz (typ) - set by RT pin (63.4kΩ), enabling compact magnetics and fast transient response. |
| Telemetry Resolution | 16-bit ADC - measures VBAT with ±10mV offset error and 192.4µV/LSB resolution per 6V cell, critical for accurate absorb/equalize transitions. |
| I²C Interface | Standard-mode (400kHz), 7-bit address 0b1101000 - enables host-configurable charge profiles, alerts, and real-time battery health monitoring. |
| Thermal Protection | Die temperature sensing with thermal regulation - reduces charge current above 70°C die temp to prevent sustained overheating. |
Pinout & Package
Package: 28-pin 4mm × 5mm × 0.75mm QFN with exposed AGND pad (Pin 29), rated for −40°C to +125°C junction temperature (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CSN / CSP | Charge current sense differential inputs | Measure (VCSP–VCSN)/RSNSB to servo 3.2A max; require Kelvin connection to sense resistor for <±0.75mV accuracy. |
| CLN / CLP | Input current sense differential inputs | Implement input current limiting prior to system load; support MPPT sweep by regulating IIN dynamically. |
| BATSENS+ | Battery positive sense | Kelvin-sense point for precise VBAT measurement; decouples battery voltage reading from IR drop in interconnects. |
| INFET / BATFET | External N-MOSFET gate drivers | Drive reverse-blocking FETs to isolate VIN and battery; enable instant-on PowerPath handover without system brownout. |
| NTC / NTCBIAS | Thermistor interface | 1.2V bias source and ADC input for NTC thermistors (β = 3490K); enables temperature-controlled charge termination and safety cutoff. |
| SCL / SDA / SMBALERT | I²C communication and alert | Open-drain interface referenced to DVCC; SMBALERT asserts on configurable events (e.g., overtemp, charge timeout, MPPT failure). |
Key Features
| Feature | Design Value |
|---|---|
| MPPT Enabled by Default | SADM variant firmware activates solar MPPT at power-up; no register write required - simplifies integration for off-grid solar-powered devices. |
| PowerPath Instant-On | Decouples VOUT from VBAT; system powers up immediately even with 0V battery, eliminating boot delays in medical or industrial handhelds. |
| Four-Loop Regulation | Simultaneously regulates VBAT, IBAT, IIN, and VIN - prevents input collapse during high-load charging and enforces solar panel operating point stability. |
| 16-Bit Telemetry System | Measures battery resistance (RBAT) via open-circuit voltage sampling during BSR cycles; enables predictive battery health assessment over lifetime. |
| Thermal Regulation with Hysteresis | Reduces charge current linearly above 70°C die temp and restores at 60°C; avoids thermal shutdown cycling while maintaining safe junction temperatures. |
Applications
| Medical Instruments | Industrial Handhelds |
|---|---|
Use Scenario: Portable ultrasound or patient monitor powered by sealed lead-acid battery with solar backup in field-deployed ambulances. IC Role / Device Role / Timing Role: Primary battery charger and PowerPath manager; handles seamless transition between solar, vehicle USB, and AC adapter inputs while maintaining uninterrupted operation. Use Value: MPPT maximizes energy harvest from small solar panels; instant-on ensures device powers up instantly after battery replacement or deep discharge. |
Use Scenario: Rugged barcode scanner used in warehouse logistics with intermittent solar recharging during outdoor staging. IC Role / Device Role / Timing Role: Lead-acid battery charger with input current limiting and telemetry; manages variable solar irradiance and prevents overloading weak input sources. Use Value: Input current prioritization ensures system remains powered during charging; I²C telemetry reports battery resistance drift to schedule preventive maintenance. |
| Ruggedized Notebook | USB-C Power Delivery Systems |
Use Scenario: Military-grade notebook with 24V lead-acid backup running in vehicle-mounted environments with vibration and wide temperature swings. IC Role / Device Role / Timing Role: Dual-path power manager; isolates battery from noisy vehicle electrical systems while supporting cold-cranking and jump-start resilience. Use Value: Low-loss PowerPath minimizes voltage drop across external FETs; thermal regulation sustains charging in high-ambient desert conditions. |
Use Scenario: USB-C PD sink device (e.g., portable power station) accepting 20V/5A input while charging 12V lead-acid battery bank. IC Role / Device Role / Timing Role: Buck charger with I²C-configurable VCHARGE and ICHARGE; interfaces with PD controller to adapt charging based on negotiated voltage/current. Use Value: I²C telemetry feeds host MCU with real-time battery state for intelligent PD contract negotiation and thermal derating. |
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 |
|---|---|---|---|
| LTC4162EUFD-SAD#PBF | No MPPT enabled; requires explicit I²C command to activate MPPT algorithm. | Suitable for fixed-input applications (e.g., wall adapter only) where solar is not present. | Select SAD if MPPT is unused - reduces firmware complexity and eliminates unnecessary MPPT sweep overhead. |
| LTC4162EUFD-SSTM#PBF | Fixed output voltage (non-I²C adjustable); MPPT enabled; no runtime voltage reconfiguration. | Used where battery voltage is static and firmware simplicity is prioritized over adaptive charging profiles. | Select SSTM for cost-sensitive designs with unchanging battery chemistry/voltage - eliminates I²C dependency for basic operation. |
Compared with LTC4162EUFD-SADM#PBF, the SAD variant trades MPPT readiness for reduced firmware initialization steps, while the SSTM variant sacrifices I²C voltage adjustability to simplify host interaction - both retain identical PowerPath architecture, telemetry resolution, and thermal regulation behavior.
Availability
LTC4162EUFD-SADM#PBF is available at Aetrix Electronics and suitable for medical instrumentation, industrial handhelds, ruggedized notebooks, and USB-C PD battery backup systems requiring stable component supply, long-term lifecycle support, and guaranteed MPPT functionality out-of-box.
Supply support for LTC4162EUFD-SADM#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 digital signal processing technologies for precision instrumentation, industrial, and automotive applications.
The LTC4162 product line delivers integrated battery management solutions for lead-acid, Li-ion, and LiFePO₄ chemistries - designed specifically for portable, off-grid, and mission-critical systems demanding reliability, telemetry, and autonomous power path control.
FAQ
What distinguishes the LTC4162EUFD-SADM#PBF from other variants in the LTC4162 family?
The LTC4162EUFD-SADM#PBF is factory-configured with MPPT enabled at power-up and retains full I²C-adjustable charge voltage/current capability. Unlike the SAD variant (MPPT disabled by default) or SSTM (fixed voltage, MPPT enabled), the SADM variant delivers immediate solar optimization without host intervention while preserving runtime configurability - making it ideal for solar-integrated portable equipment where firmware simplicity and energy harvesting efficiency are critical. This behavior is confirmed in the Order Information table and Applications Information section of the Rev B datasheet.
Does the LTC4162EUFD-SADM#PBF support charging multiple lead-acid battery configurations?
Yes, the LTC4162EUFD-SADM#PBF supports 6V, 12V, 18V, and 24V lead-acid batteries via hardware strapping of CELLS0 and CELLS1 pins. Each combination selects a nominal battery voltage range, and the IC automatically configures its absorb and equalize charge algorithms accordingly. The SADM variant does not restrict this flexibility - all four configurations remain fully accessible and validated in the Electrical Characteristics table and Typical Application circuits. No firmware update or I²C register change is needed to switch between voltages.
How does the PowerPath architecture in the LTC4162EUFD-SADM#PBF ensure instant-on operation?
The LTC4162EUFD-SADM#PBF uses two independent charge pumps to drive external N-channel MOSFETs (INFET and BATFET), creating separate low-loss paths from VIN and the battery to VOUT. When VIN is applied, the INFET path activates first, powering the system load directly - even if the battery is at 0V. This decoupling eliminates boot delay and guarantees system startup regardless of battery state. The behavior is demonstrated in Figure G11 (Example Power Path Handover) and described in the Operation section under "Instant-On PowerPath architecture".
Can the LTC4162EUFD-SADM#PBF measure battery internal resistance (RBAT)?
Yes, the LTC4162EUFD-SADM#PBF performs open-circuit voltage measurements during Battery State Read (BSR) cycles to calculate RBAT with ±250µΩ typical standard deviation (per Figure G20). This 16-bit telemetry value is read directly over I²C from dedicated registers and correlates with battery aging - enabling predictive maintenance in field-deployed equipment. The measurement is hardware-accelerated and requires no host MCU computation, as confirmed in the Pin Functions and Typical Performance Characteristics sections.
What thermal protection features are implemented in the LTC4162EUFD-SADM#PBF?
The LTC4162EUFD-SADM#PBF integrates a die temperature sensor with programmable thermal regulation: charge current linearly decreases above 70°C die temperature and fully recovers at 60°C. This hysteresis prevents oscillation and avoids hard thermal shutdown. The feature operates autonomously without I²C intervention and is validated across −40°C to +125°C junction range (E-grade). Thermal performance data is shown in Figure G16, and specifications appear in the Absolute Maximum Ratings and Electrical Characteristics tables.
LTC4162EUFD-SADM#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)
LTC4162EUFD-SADM#PBF FAQ
1.How can I place an order for LTC4162EUFD-SADM#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4162EUFD-SADM#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-SADM#PBF reliable?
The price and inventory of LTC4162EUFD-SADM#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-SADM#PBF is usually 5 days.
3.What payment methods are accepted for LTC4162EUFD-SADM#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4162EUFD-SADM#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4162EUFD-SADM#PBF?
LTC4162EUFD-SADM#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4162EUFD-SADM#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-SADM#PBF?
For technical support, including LTC4162EUFD-SADM#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4162EUFD-SADM#PBF requirements.
6.How does Aetrix verify that LTC4162EUFD-SADM#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4162EUFD-SADM#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-SADM#PBF meets industry standards.
7.What is the process for return or replacement of LTC4162EUFD-SADM#PBF?
All LTC4162EUFD-SADM#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4162EUFD-SADM#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-SADM#PBF part is unused and in its original packaging.
Return procedure for LTC4162EUFD-SADM#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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