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RP605Z253B-E2-T

RP605Z253B-E2-T

Nisshinbo Micro Devices Inc.
Battery Management, Power Supplies PMIC 20-WLCSP-P3 (2.32x1.71)
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Overview

The RP605Z253B-E2-T is an ultra-low power buck-boost DC/DC converter with an integrated battery monitor tailored for low-current IoT and wearable applications. It operates from a wide input range of 1.8V to 5.5V and features an exceptionally low quiescent current of 300nA, maximizing battery life in devices that spend most of their time in sleep modes.

Why Choose This Part

The component stands out with its ultra-low 0.3uA quiescent current and high efficiency at light loads, which is essential for extending the life of coin-cell or small capacity batteries. Its compact 20-WLCSP package saves significant PCB area while integrating both the buck-boost regulator and battery monitoring circuitry.

Applications

Wearable Devices
Ideal for fitness trackers and smartwatches where space is limited and battery life is critical.
Low-Power IoT Sensors
Powers remote environmental or industrial sensors operating on primary lithium or small Li-ion batteries.
Energy Harvesting Systems
Efficiently manages power from high-impedance energy harvesting sources like solar cells or thermal generators.
Battery Monitoring
Utilizes the integrated battery monitor division ratio (VIN/3) to provide a low-power analog output for MCU voltage sensing.

Key Specifications

Applications Battery Management, Power Supplies
Mounting Type Surface Mount
Package / Case 20-XFBGA, WLCSP
Current - Supply 300nA
Voltage - Supply 1.8V ~ 5.5V
Operating Temperature -40degC ~ 85degC
Supplier Device Package 20-WLCSP-P3 (2.32x1.71)

Getting Started

Designers should follow the recommended WLCSP layout guidelines to manage the high-density 0.4mm pitch and ensure proper placement of the small 0603 or 0402 sized inductors and capacitors. Evaluation boards like the RP605Z evaluation kit are available to benchmark efficiency and transient response across the 1.8V to 5.5V input range.

Also Consider

MAX17222 Analog Devices - Offers an even lower 300nA IQ with a wide 0.4V to 5.5V input range but lacks the integrated battery monitor function.
TPS62740 TITexas Instruments - A high-efficiency buck converter with 360nA IQ and integrated load switch, suitable for applications where buck-boost capability is not required.