RP514x Series
Ultra-low Power Consumption 100 mA Buck DC/DC Converter
with Battery Monitor
No.EA-504-190328
OVERVIEW
The RP514x is a buck DC/DC converter with a Battery Monitor (BM) featuring ultra-low current and low-
voltage resistance. The battery monitor divides the input voltage (V
IN
) into 1/3 or 1/4, and directly provides
the MCU’s built-in low voltage AD converter with buffered voltage without external circuits.
KEY BENEFITS
●
●
●
●
Ultra-low consumption current (I
Q
:0.3 μA ) with the VFM control for DC/DC
(switching frequency: 1 MHz max.)
High efficiency under light load conditions: 90% with 1.8 V and 100 mA
Reducing components and space by combining DC/DC and BM into a single chip
Suitable for coin batteries and USB ports due to its wide input voltage range from 1.8 V to 5.5 V
KEY SPECIFICATIONS
DC/DC Section
● Supply Current: Typ. 0.3 μA
● Output Current: 100 mA
● Input Voltage Range: 1.8 V to 5.5 V
● Output Voltage Range : 1.0 V to 4.0 V
● Output Voltage Accuracy: ±1.5%
Battery Monitor Section
● Output Voltage: V
IN
/3 (RP514xxx3x)
V
IN
/4 (RP514xxx4x)
● Supply Current: Typ. 0.1 μA
TYPICAL APPLICATIONS
RP514x
Signal
V
IN
CE1
PVIN
Buck (Step-down)
DC/DC Converter
LX
VOUT
PGND
C
OUT1
22 µF
AVIN
AGND
L
2.2 µH
V
OUT
PACKAGES
WLCSP-9-P2
1.45 x 1.48 x 0.36 (mm)
DFN(PLP)2527-10
2.7 x 2.5 x 0.6 (mm)
MCU
VCC
Battery Monitor
Signal
C
IN
10 µF
C = Ceramic Capacitor
CE2
BM
V
BM
ADC
C
OUT2
0.1µF to 0.22 µF
●
●
●
●
APPLICATIONS
Coin cell-used equipment and Li-ion battery-used equipment
Wearable devices such as SmartWatch, SmartBand and Health monitoring
Low Power RF Modules such as
Bluetooth®
LE, Zigbee, WiSun and ANT
Low Power CPU, Memory, Sensor device and Energy Harvester
1
RP514x
No.EA-504-190328
SELECTION GUIDE
The set output voltage for DC/DC, the division ratio of BM output voltage, the auto-discharge function
(1)
for
DC/DC and the packages are user-selectable options.
Selection Guide
Product Name
RP514Zxx#$-TR-F
RP514Kxx#$-TR
Package
WLCSP-9-P2
DFN(PLP)2527-10
Quantity per Reel
5,000 pcs
5,000 pcs
Pb Free
Yes
Yes
Halogen Free
Yes
Yes
xx: Specify the set output voltage for DC/DC (V
SET
).within the range from 1.0 V (10) to 4.0 V (40)
The voltage in 0.05 V step is shown as follows:
Ex. 1.25 V: RP514x12xx5
Refer to the
Product-specific Electrical Characteristics
for detail information.
* Contact our sales representatives for other voltages.
#: Select the division ratio of BM output voltage.
3: V
IN
/3
4: V
IN
/4
$: Select the auto-discharge option for DC/DC.
A: DC/DC auto-discharge is not included
B: DC/DC auto-discharge is included
(1)
Auto-discharge function quickly lowers the output voltage to 0 V by releasing the electrical charge accumulated in the
external capacitor, when the chip enable signal is switched from the active mode to the standby mode.
2
RP514x
No.EA-504-190328
BLOCK DIAGRAMS
VOUT
High Side
Current
Detector
PVIN
－
＋
Switching
Control
LX
Vref
Soft Start
CE1
AVIN
Enable
Control
Low Side
Current
Detector
UVLO
PGND
AGND
＋
BM
－
CE2
Enable
Control
RP514xxxxA Block Diagram: Without DC/DC auto-discharge function
VOUT
High Side
Current
Detector
PVIN
－
＋
Switching
Control
LX
Vref
Soft Start
CE1
AVIN
Enable
Control
Low Side
Current
Detector
UVLO
PGND
AGND
＋
BM
－
CE2
Enable
Control
RP514xxxxB Block Diagram: With DC/DC auto-discharge function
3
RP514x
No.EA-504-190328
PIN DESCRIPTIONS
Top View
3
2
1
A
B
C
3
2
1
C
B
A
Bottom View
RP514Z (WLCSP-9-P2) Pin Configuration
RP514Z Pin Description
Pin No.
A1
B1
C1
A2
B2
C2
A3
B3
C3
Symbol
AVIN
PVIN
LX
CE1
CE2
PGND
BM
VOUT
AGND
Description
Input Pin for Analog Power Supply (also for Battery Monitor)
Input Pin for Power Supply
Switching Pin
DC/DC Enable Pin (Active-high)
Battery Monitor Enable Pin (Active-high)
Power Ground Pin
Battery Monitor Output Pin
DC/DC Output Pin
Analog Ground Pin
4
RP514x
No.EA-504-190328
Top View
10
9
8
7
6
6
Bottom View
7
8
9
10
(1)
1
2
3
4
5
5
4
3
2
1
1
RP514K [DFN(PLP)2570-10] Pin Configuration
RP514K Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
Symbol
VOUT
AGND
PGND
LX
LX
PVIN
AVIN
CE1
CE2
BM
DC/DC Output Pin
Analog Ground Pin
Power Ground Pin
Switching Pin
Switching Pin
Input Pin for Power Supply
Input Pin for Analog Power Supply (also for Battery Monitor)
DC/DC Enable Pin (Active-high)
Battery Monitor Enable Pin (Active-high)
Battery Monitor Output Pin
Description
(1)
The tab on the bottom of the package is substrate level (GND). It is recommended that the tab be connected to
the ground plane on the board, but it is possible to leave the tab floating.
5
stm32/stm8
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