IP2312 4V35 Single Cell Lithium Battery Charging IC SOP-8

IP2312 Single Cell Lithium Battery Charging IC SOP-8 is a highly integrated, fixed 4.35V linear charger designed specifically for single-cell lithium-ion and lithium-polymer batteries. This compact solution efficiently manages the entire charge cycle, implementing the necessary constant current (CC) and constant voltage (CV) modes required to safely and optimally charge 1S Li-ion cells. Consequently, it offers robust thermal regulation that prevents overheating during high-current charging, which is vital for device longevity and user safety. Furthermore, its small SOP-8 package and minimal external component count (only a single resistor needed to set the charge current) make the IP2312 ideal for space-constrained, portable electronic devices. You can rely on this IC to deliver a safe, simple, and effective charging solution for your next project.

Key Features:

• High Charge Voltage: Designed to charge 4.35V Li-ion batteries, allowing for a slightly higher energy density compared to standard 4.2V cells.
• Adjustable Charge Current: You can easily set the charging current up to 1 A (or specified maximum) using a single external resistor connected to the PROG pin.
• Thermal Regulation: The IC automatically reduces the charge current when the internal temperature exceeds a threshold (≈120°C), ensuring safe operation without external cooling.
• Complete Charge Cycle: Implements both Constant-Current (CC) and Constant-Voltage (CV) charging phases with automatic charge termination.
• High Accuracy: Achieves a charge voltage accuracy of ±1%, providing precise control over the battery terminal voltage.

Technical Specifications:

• Input Supply Voltage (V_IN): 4.5 V to 5.5 V (Optimized for 5V USB input)
• Fixed Output Voltage (V_BAT): 4.35 V
• Maximum Charge Current (I_CHG): Up to 1 A (Resistor settable)
• Charge Voltage Accuracy: ±1%
• Termination Current (I_TERM): Typically 10% of the set charge current.
• Thermal Shutdown Temperature: ≈ 150°C
• Operating Temperature Range: −40°C to +85°C

Mechanical Specifications:

• Package Type: SOP-8 (Small Outline Package)
• Mounting: Surface Mount Device (SMD)
• Thermal Dissipation: Integrated thermal regulation to manage heat dissipation during high-current operation.
• Moisture Sensitivity Level (MSL): Level 3

Dimensions:

• Body Length: ≈ 4.9 mm
• Body Width: ≈ 3.9 mm
• Height: ≈ 1.5 mm
• Lead Pitch: 1.27 mm

Pinout and Wiring:

• Pin 1 (PROG): Connect an external resistor (R_PROG) from this pin to GND to set the charging current.
• Pin 2 (GND): Connect to the circuit ground and the negative terminal of the battery.
• Pin 3 (V_IN): Input voltage supply (typically 5V from USB). Connect a bypass capacitor here.
• Pin 4 (STAT): Open-drain status output. Pull low indicates charging; High-Z indicates charge complete/no battery.
• Pin 5, 6, 7, 8 (BAT): Connect these pins to the positive terminal of the single Li-ion/Li-Po battery. These pins are internally connected.

Datasheet Reference:

• Download IP2312 Single Cell Li-ion Charger Datasheet

Commonly Used in:

• Wearable Devices: Powering small smartwatches, fitness trackers, and specialized sensors requiring a tiny charging solution.
• Portable Audio: Integrating charging functionality into wireless earbuds, Bluetooth speakers, and MP3 players.
• USB-Powered Tools: Used in small hobby tools, LED lighting, and other gadgets charged directly from a USB port.

Applications:

• Li-Po Battery Management: Providing safe and consistent charging for modern, high-energy-density Li-Po cells rated at 4.35V.
• Backup Power Solutions: Managing the charging circuit for small emergency power banks or solar-charged battery packs.
• DIY Electronics Projects: Offering a simple, single-IC charging interface for custom portable devices built by enthusiasts.

Equivalent Models:

• LTC4054 / TP4056: While these are standard 4.2V chargers, the IP2312 serves a similar function but targets the higher 4.35V chemistry.
• MCP73831: A general-purpose linear charger from Microchip, however, it would require external circuitry to precisely achieve the 4.35V termination voltage.

Package Includes:

• 1 x IP2312 4V35 Single Cell Lithium Battery Charging IC SOP-8