AP4460A Datasheet, PDF (1/3 Pages) HuaXinAn Electronics CO.,LTD – Step-up DC-DC Converter

[AP4460A]
AP4460A
Step-up DC-DC Converter with Power Path for Single Solar Cell
1. General Description
The AP4460A is a synchronous step-up DC-DC converter that can be operated by a single solar cell. It has a
power management function which supplies power to an external system, charges super capacitors, or supplies
power from the super capacitor to the system. The DC-DC converter is a hysteric comparator type and composed
of an ultra-low power start-up circuit which starts from only 0.35 V. Because the power consumption is extremely
low, the AP4460A can operate from the input power of around 50μW generated by a solar panel under indoor
lighting. The input voltage of the DC-DC converter, i.e. output voltage of the solar cell is controlled by external
resistors for the reference voltage of the IC. The best power efficiency can be obtained by adjusting this input
level setting according to the characteristics of a connected solar cell. The AP4460A has a Power-Path Control
switches for supplying power to the external system and charging a super capacitor. When the output voltage of
DC-DC converter reaches a target voltage, the IC starts to charge a compact capacitor. After charging up to the
target voltage of a compact capacitor, then the IC starts to supply power to the external system. Supplying power
to the external system via capacitor makes it possible to operate high load external system even with a low input
power. If the input power is surplus, the extra power is stored gradually in a super capacitor. The super capacitor
automatically supplies power to the external system, if the power supply input is low. The AP4460A is suitable
for sensor nodes of energy harvesting equipment.
2 . Features
 Start-up Voltage
0.35V
 Operating Temperature Range
-30 ~ 85°C
 Input Voltage
from 0.14V
 DC-DC Output Voltage
2.5 ~ 4.0V (±5%)
 Step up DC-DC Converter with Hysteric Comparator Control
 Synchronous Rectification by High-side Zero-cross Detection
 Input Voltage Control Function
 Power Path Function with Automatic Control
 Battery Compatible Mode
 Power Generation Monitoring Function
 Efficiency
80% (When 0.5V and 1mA Input, 3V output)
 Package
24-pin QFN
 Applications
- Power Supply Systems by Single Solar Cell
- Portable Electronics
- Sensor Nodes
- Wearable Devices
Rev.0.3
2014/06
-1-