AAT2557 Buy Now
500mA Battery Charger and 300mA LDO Regulator for Portable Systems

The AAT2557 is a fully integrated 500mA battery charger and a 300mA low dropout (LDO) linear regulator. The input voltage range is 4V to 6.5V for the battery charger and 2.7V to 5.5V for the linear regulator, making it ideal for applications operating with single-cell lithium-ion/polymer batteries.

The battery charger is a complete constant current/constant voltage linear charger. It offers an integrated pass device, reverse blocking protection, high accuracy current and voltage regulation, charge status, and charge termination. The charging current is programmable via external resistor from 15mA to 500mA. In addition to these standard features, the device offers over-voltage, current limit, and thermal protection.

The linear regulator is designed for fast transient response and good power supply ripple rejection. Capable of up to 300mA load current, it includes short-circuit protection and thermal shutdown.

The AAT2557 is available in a Pb-free, thermally-enhanced TSOPJW-14 package and is rated over the -40°C to +85°C temperature range.


  • Battery Charger:
  • Input Voltage Range: 4V to 6.5V
  • Programmable Charging Current up to 500mA
  • Highly Integrated With
  • Charging Device
  • Reverse Blocking Diode
  • Linear Regulator:
  • 300mA Output Current
  • Low Dropout: 400mV at 300mA
  • Fast Line and Load Transient Response
  • High Accuracy: ±1.5%
  • 70μA Quiescent Current
  • Short-Circuit, Over-Temperature, and Current Limit Protection
  • TSOPJW-14 Package
  • -40°C to +85°C Temperature Range
Data Sheets AAT2557 Data Sheet 202178A.pdf (1640 KB)
Designer Info AAT2557 Block Diagram AATI_BD_212.jpg (15 KB)
Designer Info AAT2557 Gerber File AATI_Gerber_212.zip (15 KB)
ProductName : AAT2557
Battery Charger Type : Linear
Number of Step-up Switching Regulators : 0
Number of Step-down Switching Regulators : 0
Number of LDO Regulators : 1
Min. VIN (V) : 2.7
Max. Regulator VIN (V) : 5.5
Max Charger VIN (V) : 6.5
Max Charger Protected VIN (V) : N/A
Max. Charge Current (mA) : 500
Max. Single/ Channel Output Current (mA) : 300
Min. Single/ Ch Output Voltage (V) : N/A
Max Step-up Output Voltage (V) : VIN
Output Voltage Control : Fixed
Operating Frequency (kHz) : N/A
Package (mm) : TSOPJW 14L, 3.05 x 2.85 x 1.02
Product Information:
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