ME4056ASPG-N

ME4056-N is a single-cell lithium battery charge management IC featuring constant-voltage and constant-current charging. The maximum charging current can reach 0.9A, with no external diode or current-sense resistor required. ME4056-N includes two open-drain status indicator pins: a charge status indicator CHRG and a battery fault status indicator STDBY. The internal thermal feedback circuit automatically reduces the charging current when the temperature exceeds 145°C. This feature allows users to maximize the power handling capability of the IC without concern about overheating damaging the IC or external components, ensuring maximum reliability. When the input voltage exceeds the undervoltage lockout threshold and the enable pin is driven high, ME4056-N begins charging the battery and the CHRG pin is pulled low to indicate charging in progress. If the battery voltage is below 2.9V, the charger applies a small trickle current to pre-charge the battery. When the battery voltage exceeds 2.9V, the charger switches to constant-current mode, with the charging current determined by the resistor between the PROG pin and GND. As the battery voltage approaches 4.2V (or 4.34V), the charging current gradually decreases. When the current drops to the end-of-charge threshold (1/10 of the constant-current value), the charging cycle terminates, the CHRG pin goes high-impedance, and STDBY is driven low. When the battery voltage falls below the recharge threshold, a new charging cycle begins automatically. The internal high-precision voltage reference, error amplifier, and resistive voltage divider network ensure the battery terminal regulation voltage accuracy is within 1%, meeting the requirements for lithium-ion and lithium-polymer batteries. When the input power is removed or the input voltage drops below the battery voltage, the charger enters sleep mode. The battery leakage current is as low as 2µA, thereby extending standby time. If the enable pin is driven low, the IC will stop charging.

Applications

• Mobile phones
• Digital cameras
• MP3, MP4 players
• Bluetooth applications
• Portable devices
• USB power supplies, adapters

Key features

• Maximum operating voltage up to 7V for improved system reliability
• Programmable charge current up to 0.9A
• Reverse battery protection
• Internal thermal feedback protection to maintain charge within safe operating range
• No external MOSFET, sense resistors, or blocking diodes required
• Single-cell complete linear charger in ESOP8 package
• ±1% CC/CV switching accuracy with fixed 4.2V / 4.34V charge termination voltage
• Automatic recharge function
• Dual charge status outputs with battery absent and fault indication
• C/10 charge termination
• Standby current 55μA
• 2.9V trickle charge threshold
• Soft-start inrush current limiting
• Battery temperature monitoring