AsahiKASEI AP4470 Manual

The AP4470 is an ultra-low consumption power management chip that integrates a step-up DC/DC
converter and hysteresis comparators. The AP4470 requires only 0.20V input to start boosting without
the need for an external transformer. The AP4470 has hysteresis operation switch that can control the
power supply for target devices (sensors, wireless modules, LEDs) while protecting external storage
(capacitors), and the target.
1μW DC input is enough to startup the AP4470. Converted output is stored to external storage device
and the AP4470 monitors the device. When the voltage of external storage reaches 3.3V, the AP4470
automatically starts supplying to the target device and stops supplying if the voltage drops down to
2.6V. Overvoltage protection function works at 3.55V.
2-types of power indicators offer reset function and trigger switch function with zero standby current.
The trigger(Startup FLAG) is achieved by a signal that is output when DC/DC converter becomes
active. The reset(Power Good) is a signal that indicates the AP4470 starts supplying, which means
external storage's voltage reaches 3.3V.
The AP4470 is ideally suited for several W to several mW sources energy harvesting. This provides a
self-powered wireless sensor node with simple hardware design.

Startup voltage

DC/DC switching frequency

Operation Voltage
Operation temperature

Power Consumption
DC/DC converter is active
DC/DC converter is off

DC/DC active indicator

Power Good indicator

DC/DC disable function

On-chip rectifier diode for DC/DC converting (using external diode is also available)

Support high impedance power sources up to tens of k

Package

Energy Harvesting
➢
Wireless Sensor Node
➢
Wearable and Portable Device

Zero standby current trigger switch
Example of Energy Harvester (several W to several mW sources)

➢
Ambient Light, Single cell solar battery
➢
Vibration
➢
Thermal
➢
Microbial Fuel Cell
200200020-E-01
Ultra-Low Power Step-up DC/DC Converter

1. General Description

2. Features

: Cold start from 0.20V typical
: 60kHz typical at VIN=0.4V
: up to 1.0V
up to 5.5V
: -30 ~ +85ºC
: 7A typical at VIN=0.4V
: 0.5A typical at VIN=0.4V
(The AP4470 supplies power including over charge
protection current)
: 20-pin HWQFN (3.0mm×3.0mm×0.75mm 0.5mm pitch)

3. Applications

- 1 -
for Energy Harvesting Applications
(VIN)
(VDD1 / VDD2)
[AP4470]
AP4470
2020/3