High-accuracy Step-down DC-DC Converter with 4.5A MOSFET

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  • Data Sheet


The AP3440ABN111 is a synchronous rectification PWM control step-down DC-DC converter of the current mode with excellent transient load response characteristics.
The recommended operational temperature ranges from −40 to 125ºC. It is capable for automotive use that demands high reliability.
The AP3440ABN111 supports input voltage from 4.1V to 5.5V and its output voltage is 1.112V.
The AP3440ABN111 is equipped with Output Over-Current Protection, Output Over-Voltage Protection, Under Voltage Lock Out, Thermal Protection, and Power-good function.

  • Supporting High Reliability Systems
    The output voltage is constantly monitored by ±2% high precision power good function. When the output voltage is in an abnormal state, the AP3440 sends the error flag signal to microcomputers promptly. It supports a fail-safe environment with appropriate data saving processing.

  • Downsizing PCB
    The AP3440 integrates a MOSFET that can supply maximum output current of 4.5A in a 5mm × 5mm 28-pin QFN package with a heat dissipation pad on the back surface. 2.1MHz operation helps miniaturizing peripheral components. Therefore, a printed circuit board can be downsized.

  • 150ºC warranty
    Electrical characteristics are guaranteed in Tj = -40 to 150ºC, assuming operation environments that require high reliability.

Key Features

AP3440ABN series
Monolithic Step-Down DC-DC Converter with High-Accuracy Power Good
Product Name AP3440ABN111 AP3440ABN122 AP3440ABN182
Input Voltage[V]4.1 to 5.5V
Output Voltage[V]1.112V +2.07%,-1.80%1.227V +1.96%,-1.79%1.822V +1.81%,-1.87%
Output Voltage
Monitoring Threshold (H)
[V]1.164V +1.63%,-2.00%1.280V ±1.64%1.905V +1.63%,-1.68%
Output Voltage
Monitoring Threshold (L)
[V]1.063V +1.69%,-1.60%1.172V ±1.62%1.763V ±1.64%
Maximum Output Current[A]4.5A
Oscillation Frequency[MHz]
2.1MHz ± 7.14%
Operation Temperature[°C]-40 to 105°C
28-pin QFN0505
Size (D/W/H)[mm]5.00mm / 5.00mm / 0.75mm
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