RP124x Series
100 mA Ultra-low Supply Current (0.3 µA) LDO Regulator with Battery Monitor
No. EA-503-190312
OVERVIEW
The RP124x is an LDO regulator with a battery monitor (BM) featuring ultra-low supply current.
The battery monitor has a function which divides the input voltage (V
IN
) into 1/3 or 1/4. The battery
charge remaining can be monitored by MCU. The buffering output enables directly inputting a signal
into the low voltage A/D converter (ADC) with built-in MCU.
KEY BENEFITS
● Achieving Low Supply Current of 0.3 µA, Longer Battery Life and Downsizing
● Requiring Only Three External Capacitors and Suitable for Space-saving Mounting for the Smaller Packages
KEY SPECIFICATIONS
LDO Section
● Input Voltage Range: 1.7 V to 5.5 V
● Supply Current: Typ. 0.2 μA
● Output Voltage Accuracy: ±0.8%
● Output Current: 100 mA
● Ceramic Capacitor Compatible: 1.0 μF or more
BM Section
● Output Voltage: V
IN
/3 (RP124xxx3x)
V
IN
/4 (RP124xxx4x)
● Supply Current: Typ. 0.1 μA
● Ceramic Capacitor Compatible: 0.1 μF to 0.22 μF
TYPICAL APPLICATIONS
RP124
VDD
LDO
C
IN
CE control
CE
Battery
Monitor
GND
BM
C
OUT
C
BM
ADC
GND
VOUT
VCC
PACKAGES
DFN1212-6
1.2 mm x 1.2 mm x 0.4 mm
SOT-23-5
2.9 mm x 2.8 mm x 1.1 mm
MCU
Battery
The diagram is assumed to be used for RP124xxxxE.
APPLICATIONS
Battery powered IoT devices
Energy harvesting devices
Low power wireless communication modules including:
Bluetooth®
LE, Zigbee, and LPWA
Low power consumption CPUs, memories, and sensors
1
RP124x
No. EA-503-190312
SELECTION GUIDE
The LDO set output voltage, the divided ratio of BM output voltage, the CE pin function and the auto-discharge
function are user-selectable options.
Selection Guide
Product Name
RP124Lxx#-TR
RP124Nxx#-TR-FE
Package
DFN1212-6
SOT-23-5
Quantity per Reel
5,000 pcs
3,000 pcs
Pb Free
Yes
Yes
Halogen Free
Yes
Yes
xx: Specify the LDO set output voltage (V
SET
).
1.2 V (12) / 1.5 V (15) / 1.8 V (18) / 2.1 V (21) / 2.3 V (23) / 2.4 V (24) / 2.5 V (25) / 2.7 V (27) /
2.8 V (28) / 3.0 V (30) /3.1 V (31) / 3.3 V (33) / 3.6 V (36)
Contact Ricoh sales representatives for other voltages.
#: Specify the divided ratio of BM output voltage.
3: V
IN
/3
4: V
IN
/4
:
Specify the CE pin and the auto-discharge option.
B
D
E
CE pin
Controlling LDO with the CE pin (Active-high)
Controlling LDO with the CE pin (Active-high)
Controlling BM with the CE pin (Active-high)
LDO
BM
LDO
BM
LDO
BM
Auto-discharge
No
No
Yes
No
No
Yes
2
RP124x
No. EA-503-190312
BLOCK DIAGRAMS
RP124xxxxB Block Diagram
RP124xxxxD Block Diagram
3
RP124x
No. EA-503-190312
RP124xxxxE Block Diagram
4
RP124x
No. EA-503-190312
PIN DESCRIPTIONS
Top View
6
5
4
Bottom View
4
5
6
5
4
(1)
(mark side)
1
2
3
3
2
1
1
1
2
3
RP124L (DFN1212-6) Pin Configuration
RP124N (SOT-23-5) Pin Configuration
RP124L (DFN1212-6) Pin Description
Pin No.
1
2
3
4
5
6
Symbol
VOUT
GND
BM
CE
NC
VDD
Output Pin
Ground Pin
Battery Monitoring Output Pin
Chip Enable Pin, Active-high
No Connection
Input Pin
Description
RP124N (SOT-23-5) Pin Description
Pin No.
1
2
3
4
5
Symbol
VDD
GND
CE
BM
VOUT
Input Pin
Ground Pin
Chip Enable Pin, Active-high
Battery Monitoring Output Pin
Output Pin
Description
(1)
The tab on the bottom of the package enhances thermal performance and is electrically connected to GND (substrate
level). It is recommended that the tab be connected to the ground plane on the board, or otherwise be left floating.
5
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