SM5401 Synchronous step-up conversion charging SOP-8

SM5401 Synchronous step-up conversion charging SOP-8 is a highly integrated power management solution designed specifically for portable lithium-ion battery applications, such as mobile power banks and handheld electronics. This versatile IC combines a linear charging management circuit with a high-efficiency synchronous boost converter into a single, compact SOP-8 package. Consequently, it significantly reduces the overall component count and PCB footprint, making it an ideal choice for space-constrained designs. The device manages the transition between battery charging and discharge modes automatically, ensuring a seamless user experience. Furthermore, the synchronous rectification technology enhances conversion efficiency, which reduces heat generation and extends battery life during discharge. Therefore, you should select the SM5401 to simplify your power system design while maintaining high performance and reliability.

Key Features:

• Integrated Dual Functionality: Combines a 0.8 A linear charger and a 0.8 A synchronous boost converter, providing a complete power path solution in one chip.
• High Efficiency: Features synchronous rectification for the step-up process, achieving up to 90% efficiency to maximize energy delivery from the battery.
• Automatic Load Detection: The IC automatically detects when a load is connected or disconnected, allowing for intelligent wake-up and standby functions.
• Comprehensive Protection: Includes built-in safeguards against over-temperature, short-circuit, over-voltage, and over-current conditions to protect the battery and the device.
• Minimal External Components: Requires only a few passive components like inductors and capacitors, which simplifies the assembly process and lowers costs.

Technical Specifications:

• Input Charging Voltage: 4.5 V to 5.5 V (Typically 5.0 V)
• Charge Current (Max): 800 mA (Adjustable via external resistor)
• Boost Output Voltage: 5.0 V to 5.1 V
• Output Current (Max): 800 mA
• Quiescent Current: < 10 μA (Standby mode)
• Switching Frequency: ≈ 1 MHz
• Efficiency: ≥ 90% at typical loads
• Operating Temperature: −40°C to +85°C

Mechanical Specifications:

• Package Type: SOP-8 (Small Outline Package)
• Lead Style: Gull-wing leads for Surface Mount Technology (SMT)
• Encapsulation: Plastic green molding compound
• Thermal Resistance: Optimized lead frame design for improved heat dissipation.

Dimensions:

• Body Length: ≈ 4.9 mm
• Body Width: ≈ 3.9 mm (Excluding leads)
• Total Width: ≈ 6.0 mm (Including leads)
• Pitch: 1.27 mm (Standard SOP-8 spacing)
• Height: ≈ 1.55 mm

Pinout and Wiring:

• Pin 1 (EN): Enable pin for controlling the boost converter operation.
• Pin 2 (VIN): Input power supply pin for battery charging (connect to 5V).
• Pin 3 (VOUT): Boost output pin providing the stabilized 5V signal to the load.
• Pin 4 (GND): System ground connection.
• Pin 5 (BAT): Battery connection pin; connects directly to the positive terminal of the Li-ion cell.
• Pin 6 (LX): Inductor connection point for the synchronous boost switching circuit.
• Pin 7 (PROG): Charge current setting pin; however, ensure you use a precise resistor to define the charging rate.
• Pin 8 (CHG): Status indicator pin to signal the charging state (typically drives an LED).

Datasheet Reference:

• Download SM5401 Synchronous Boost Charging IC Datasheet

Commonly Used in:

• Portable Power Banks: Serving as the main controller for single-cell Li-ion mobile chargers.
• Handheld Electronic Devices: Powering portable game consoles and digital cameras.
• Bluetooth Headsets: Providing charging and power management for high-end audio accessories.

Applications:

• Battery Power Management: Regulating the transition between charging from a USB source and boosting from the battery.
• USB 5V Supply: Generating a stable 5V output for peripherals from a 3.7V battery source.
• Emergency Backup Supplies: Implementing compact charging circuits in safety and backup equipment.

Equivalent Models:

• TP5400 / TP5410: Popular alternatives that offer very similar 1A boost and charging capabilities in the same package.
• HT7178: A high-voltage synchronous boost converter, however, it may require separate charging circuitry.
• FP6291: Often used as a boost-only equivalent when integrated charging is not a requirement.

Package Includes:

• 1 x SM5401 Synchronous step-up conversion charging SOP-8 IC