AP4460 Datasheet, PDF (1/18 Pages) Asahi Kasei Microsystems – Step-up DC-DC Converter with Power Path for Single Solar Cell

[AP4460]
AP4460
Step-up DC-DC Converter with Power Path for Single Solar Cell
1. General Description
The AP4460 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 AP4460 can operate with low input power 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 AP4460 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 AP4460 is suitable for sensor nodes of energy harvesting
equipment.
2 . Features
 Start-up with Ultra-low Input Voltage 0.35V(typ)
 Ultra-low Current Consumption (internal current consumption from storage element) 10nA
 Operating Temperature Range -30 ~ 85°C
 Input Voltage from 0.14V
 DC-DC Output Voltage 2.5 ~ 4.0V
 Step up DC-DC Converter with Hysteric Comparator Control
 Synchronous Rectification by High-side Zero-cross Detection
 Built-in Output Control MOSFET
 Power Path Function that Automatically Supplies Power to External System from Storage Element
(when input power is insufficient)
 DC-DC Operation Monitoring Function
 Supply power to External System Quickly without depending on Storage Element
 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
014012310-E-01
-1-
2015/04