0
20
40
60
80
100
0.1 1 10 100 1000
Efficiency [%]
I
OUT
[μA]
Vin= 4 V
Vin= 4.5 V
V
IN
=4.5V
V
IN
=4V
Buck DC/DC Converter for Energy Harvester with
Adjustable Maximum Power Point Control,
Adjustable Output Voltage and PG Function
R1801K-EV-220526
1/6
PACKAGE
TYPICAL APPLICATION CIRCUIT
APPLICATIONS
Input Voltage Range (Maximum ra
ting): 2.3V to 5.5V (6.5V)
Output Voltage Range : 2.3V to 4.5V
Maximum Power Point Control Voltage Range: 2.7V to 5.3V
Output Voltage Tolerance: ±3.0%
Operating Quiescent Current: Typ. 200nA
(Ta = 25℃, at no load)
Starting Power: 1µW (V
IN
= 4V, V
OUT
= 3.0V)
Adjustable Maximum Power Point Control,
Adjustable Output Voltage, PG Function
Protect Function: Reverse Current Protection (V
IN
≥ 2.0V)
Product Name Package Quantity per Reel
R1801KxxxA-TR DFN(PL)2730-12 5,000 pcs
xxx: Select the ideal combination of the set output voltage
(V
SET
) and the set maximum power point control voltage
(V
MPSET
) from the code number starting from 001. (For details,
refer to the electrical characteristics table by product datasheet.)
When use the PG function, use V
SET
= 2.5V or higher.
Recommend to set V
MP
>V
SET
+0.5V or higher.
DFN(PL)2730-12
3.0mm x 2.7mm x 0.6mm
TYPICAL CHARACTERISTICS
Energy harvesting module of a photovoltaic and vibration
ene
rgy harvester
Providing low operating quiescent current (I
Q
200nA) and high efficiency (80%@10µA)
Power good (PG) output as an output voltage indicator
Adjust output voltage and maximum power point control voltage with input pins
KEY SPECIFICATIONS SELECTION GUIDE
Efficiency vs. Output Current V
OUT=3.0V
L = 22µH
C
IN
= 10µF
C
OUT
= 47µF
Buck DC/DC Converter for Energy Harvester with
Adjustable Maximum Power Point Control,
Adjustable Output Voltage and PG Function
2/6
R1801K offers the low operationg quiescent current, 200nA and high efficiency. The R1801K enables to reduce the area
size per photovoltaic cell and stores electricity even in an environment where the charge from the photovoltaic element
is low, or the illuminance is relatively low.
Providing a low operating quiescent current (I
Q
200nA) and a high efficiency (80%@10µA)
Lighting
I
sup
I
loss
Energy
harvester
R1801K
Storage battery
I
sup
- I
loss
Even in places where it is relatively hard to reach the light, we want to use the energy harvester. The installation
space is limited, so we want to make the energy harvester system as small as possible.
Manufacturer Product Part# Capacity Type
TDK CeraCharge™
BCT1812M101AG
100 µAh
All-solid-state
Li-ion
Nichicon SLB series
SLB03070LR35
350 µAh Li-ion
NGK EnerCera®
ET1210C-H
ET2016C-H
ET271704P-H
4 mAh
20 mAh
5 mAh
Li-ion
Murata CT series
CT04120
3 mAh Li-ion
Recommended Storage Devices
Benefits of using low-power R1801K
Our’s ultra-low quiescent current technology !!
To charge the battery, the following condition must be realized.
Supply current from Harvester (I
sup
) ＞ Loss current of IC (I
loss
)
Ultra-low quiescent current of the R1801K helps :
- to make the harvester size smaller
- to make installable places of products increase
General Issue
Our Solution
CeraCharge™ is a trademark of TDK
EnerCera® is a trademark of NGK
R1801K-EV-220526