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Analog Devices Inc. LTC4156EUFD#PBF
- Part No.:
- LTC4156EUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC4156EUFD#PBF.pdf
- Description:
- IC BAT CHG IRON PHOSPHT 1C 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,208
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Product details
Overview
LTC4156EUFD#PBF from Analog Devices (formerly Linear Technology) is a dual-input I²C-controlled power manager and 3.5A LiFePO₄ battery charger in a 28-lead 4mm × 5mm QFN package. It manages power distribution from USB and wall adapter inputs to a single-cell LiFePO₄ battery and system load, featuring PowerPath™ instant-on operation, USB On-The-Go (OTG) back-powering, and four programmable float voltages (3.45V–3.8V).
For engineers reviewing the LTC4156EUFD#PBF datasheet, LTC4156EUFD#PBF pinout, LTC4156EUFD#PBF application, or LTC4156EUFD#PBF equivalent, this page delivers verified specifications including 3.5A max charge current, 2.25MHz switching frequency, 0.09Ω high-side MOSFET RDS(on), I²C-adjustable input/charge current limits, and integrated NTC thermistor ADC for JEITA-compliant charging.
Technical Context
The LTC4156EUFD#PBF integrates a monolithic synchronous step-down switching regulator with dual-input priority multiplexing, overvoltage protection (OVLO = 6.0V), and undervoltage lockout (UVLO = 4.25V). Its PowerPath architecture enables seamless source selection between VBUS and WALL inputs while maintaining uninterrupted system power-even during battery depletion-via low-dropout linear regulation down to 3.10V.
It implements a dedicated LiFePO₄ charge algorithm with configurable termination (C/10, C/5, C/20, C/50), safety timer (0.25–4 hours), and recharge threshold (96.6–98.4% of VFLOAT). The I²C interface supports full configuration of all operating parameters and real-time status reporting-including VBUS/WALL/USB current, battery voltage, temperature, and fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Charge Current | 3.5A - Enables fast charging of high-capacity LiFePO₄ batteries in portable medical and industrial devices. |
| Switching Frequency | 2.25MHz - Allows use of compact 1µH inductors and reduces EMI in space-constrained layouts. |
| PowerPath Output (VOUT) | 4.5V @ 3A - Delivers regulated system power directly from input sources, bypassing battery when available. |
| Float Voltage Range | 3.45V / 3.55V / 3.60V / 3.80V - Matches LiFePO₄ chemistry requirements; prevents overcharge and extends cycle life. |
| I²C Address | 0x11 (7-bit) - Enables multi-device bus integration without address conflict in complex power systems. |
| NTC ADC Resolution | 7-bit (0x00–0x7F) with kSPAN = 6.162 mV/V/LSB - Supports precise JEITA temperature profiling across –40°C to +125°C. |
| USB OTG Output | 5V @ 1.4A - Powers USB peripherals directly from battery without external boost circuitry. |
Pinout & Package
The LTC4156EUFD#PBF is housed in a 28-lead, 4mm × 5mm × 0.75mm plastic QFN package with exposed thermal pad (Pin 29 = GND). Pin assignment follows standard top-view layout with I²C, sensing, gate drive, and multiplexer control functions distributed across perimeter pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDA (1), SCL (17) | I²C bidirectional data/clock | Enable full configuration and real-time monitoring; DVCC-referenced logic ensures robust communication at 400kHz. |
| VBUS (20–22), WALLSNS (7), USBSNS (8) | Dual-input voltage sensing | Supports priority-based source selection and overvoltage protection (6.0V threshold) with internal charge pumps for gate drive. |
| USBGT (9), WALLGT (23) | N-channel MOSFET gate drivers | Drive external pass transistors; sink up to 1µA under load to maintain safe gate bias during fault conditions. |
| PROG (15), CHGSNS (12–13), BATSNS (16) | Battery charge current/voltage sensing | Enable precision current regulation (±1% typical) and float voltage control via external resistor networks and feedback dividers. |
| NTC (18), NTCBIAS (21) | Thermistor interface | Provide ratiometric A/D conversion of NTC voltage divider for JEITA-compliant charge rate adjustment. |
Key Features
| Feature | Design Value |
|---|---|
| PowerPath™ Instant-On | Maintains ≥3.10V system output even with deeply discharged battery (≤3.0V), eliminating boot failures in field-deployed equipment. |
| USB OTG Back-Power | Delivers regulated 5V/1.4A from battery to USB port without external components-enabling host-mode functionality in portable diagnostics tools. |
| Dual-Input Priority Multiplexing | Automatically selects WALLSNS over USBSNS; programmable via I²C to override default priority for flexible power architecture design. |
| LiFePO₄-Specific Charging | Four factory-set float voltages and dedicated recharge threshold prevent lithium iron phosphate overvoltage stress and optimize longevity. |
| Integrated OVP + UVLO | Protects against 7V transients (1ms) and steady-state overvoltage (6.0V); UVLO ensures clean startup at 4.25V with 150mV hysteresis. |
Applications
| Portable Medical Devices | Portable Industrial Devices |
|---|---|
Use Scenario: Handheld ultrasound or point-of-care blood analyzers requiring continuous operation during battery swap or low-battery states. IC Role / Device Role / Timing Role: Dual-input power manager and LiFePO₄ charger ensuring uninterrupted system power and chemistry-optimized charging. Use Value: Instant-On maintains display and sensor operation below 3.0V battery; 3.5A charge current reduces recharge time by >40% vs. linear chargers. | Use Scenario: Ruggedized handheld test meters used in oil/gas or utility infrastructure with intermittent AC/USB access. IC Role / Device Role / Timing Role: Priority-multiplexed power arbiter selecting wall adapter over USB, with OVP guarding against field wiring errors. Use Value: 6.0V OVLO prevents damage from miswired 12V supplies; I²C logging enables predictive maintenance via battery health telemetry. |
| Backup Power Systems | USB-C Peripheral Hubs |
Use Scenario: Smart building emergency lighting controllers needing fail-safe transition from grid to battery during outages. IC Role / Device Role / Timing Role: PowerPath controller managing seamless switchover and autonomous LiFePO₄ recharging when AC returns. Use Value: <3.19V VOUT regulation preserves microcontroller operation during brownout; storage mode draws only 0.6µA to extend shelf life. | Use Scenario: Multi-port USB hubs with battery backup enabling OTG functionality for smartphones and tablets. IC Role / Device Role / Timing Role: USB OTG power delivery IC providing 5V/1.4A from battery to downstream USB ports. Use Value: Eliminates need for discrete boost converter and load switch; ID pin detection enables automatic role negotiation without firmware intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24650RGER | Standalone 3A Li-ion charger without dual-input multiplexing or USB OTG; no I²C interface; fixed 4.2V float. | Requires external power path FETs and priority logic; unsuitable for LiFePO₄ or USB host applications. | Select only for cost-sensitive, single-source Li-ion systems where programmability and OTG are unnecessary. |
| MAX77818EWL+ | Single-input 3A buck charger with integrated fuel gauge and PMIC functions; supports Li-ion only; no WALL/USB priority arbitration. | Lacks overvoltage protection on input pins and cannot deliver regulated VOUT from battery without additional regulators. | Prefer for smartphone-like SoC power rails; avoid when dual-input redundancy or LiFePO₄ chemistry is required. |
Compared with BQ24650RGER and MAX77818EWL+, the LTC4156EUFD#PBF uniquely combines dual-input priority multiplexing, LiFePO₄-specific charging, USB OTG back-powering, and comprehensive I²C telemetry-making it the only solution that satisfies all four requirements in a single chip for portable industrial and medical designs.
Availability
LTC4156EUFD#PBF is available at Aetrix Electronics and suitable for portable medical devices, portable industrial instruments, and backup power systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC4156EUFD#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 acquired Linear Technology in 2017 and continues its legacy of high-performance analog, mixed-signal, and power management ICs for demanding applications.
The LTC4156EUFD#PBF belongs to Linear's PowerPath™ family, designed specifically for intelligent, dual-input battery-powered systems requiring seamless source arbitration, chemistry-optimized charging, and USB OTG capability.
FAQ
What battery chemistries does the LTC4156EUFD#PBF support?
The LTC4156EUFD#PBF is explicitly designed for lithium iron phosphate (LiFePO₄) batteries, with four factory-programmed float voltage settings (3.45V, 3.55V, 3.60V, 3.80V) and a dedicated recharge threshold algorithm. It does not support Li-ion or Li-polymer chemistries due to incompatible voltage profiles and termination criteria. Using LTC4156EUFD#PBF with non-LiFePO₄ cells may result in undercharging, overcharging, or premature failure.
How does the LTC4156EUFD#PBF handle input source priority between USB and wall adapter?
The LTC4156EUFD#PBF defaults to WALLSNS priority over USBSNS, enabling automatic selection of wall adapter power when both sources are present. This behavior is programmable via I²C register bits to reverse priority or disable one input entirely. The priority multiplexer uses internal charge pumps to drive external N-channel MOSFETs, ensuring fast switchover (<100µs) without system interruption.
Can the LTC4156EUFD#PBF operate without an I²C host controller?
Yes-the LTC4156EUFD#PBF operates in default configuration without I²C initialization: 3.5A charge current, 3.80V float, 100mA USB input limit, and WALLSNS priority. However, I²C is required to enable USB OTG, adjust float voltage, configure JEITA temperature profiles, or read real-time status registers. The device remains fully functional in standalone mode for basic charging and power path management.
What is the purpose of the CLPROG1 and CLPROG2 pins on the LTC4156EUFD#PBF?
CLPROG1 and CLPROG2 are current-limit programming pins that set maximum input current draw from VBUS using external resistors. CLPROG2 supports USB-compliant modes (100mA/500mA/900mA), while CLPROG1 enables higher non-USB limits (up to 3A). When shorted, CLPROG1/CLPROG2 default to 100mA USB mode at startup. Each pin provides a servo voltage (1.2V) referenced to its sense ratio (hCLPROG), enabling precise current limiting independent of input voltage variation.
Does the LTC4156EUFD#PBF include overvoltage protection on its input pins?
Yes-the LTC4156EUFD#PBF integrates dual-input overvoltage protection with 6.0V rising-threshold OVLO on both VBUS and WALLSNS/USBSNS pins. When input voltage exceeds this threshold, the corresponding GT pin (USBGT or WALLGT) is pulled low to disable external pass transistors. It also withstands 7V transients for <1ms (1% duty cycle), protecting against common field-induced surges in industrial environments.
LTC4156EUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Iron Phosphate
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- -
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- 3.7A
- Battery Pack Voltage:
- 3.8V
- Voltage - Supply (Max):
- 5.5V
- Interface:
- I2C, USB
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LTC4156EUFD#PBF FAQ
1.How can I place an order for LTC4156EUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4156EUFD#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 LTC4156EUFD#PBF reliable?
The price and inventory of LTC4156EUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4156EUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4156EUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4156EUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4156EUFD#PBF?
LTC4156EUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4156EUFD#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 LTC4156EUFD#PBF?
For technical support, including LTC4156EUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4156EUFD#PBF requirements.
6.How does Aetrix verify that LTC4156EUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4156EUFD#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 LTC4156EUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4156EUFD#PBF?
All LTC4156EUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4156EUFD#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 LTC4156EUFD#PBF part is unused and in its original packaging.
Return procedure for LTC4156EUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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