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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Nexperia USA Inc. RP604Z251A-E2-F

Name: RP604Z251A-E2-F
Brand: Nexperia USA Inc.
SKU: RP604Z251A-E2-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RP604Z251A-E2-F

Manufacturer:: Nexperia USA Inc.

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: -

Datasheet:: RP604Z251A-E2-F.pdf

Description:: RP604Z - 0.3 IQ Low Quiescent Cu

Quantity:: RFQ Add To RFQ list

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Inventory:5,000

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Product details

Overview

RP604Z251A-E2-F from Ricoh Electronics is an ultra-low quiescent current (0.3 µA) buck-boost DC/DC converter optimized for intermittent battery-powered systems. It delivers up to 300 mA output in buck mode, supports 1.8 V–5.5 V input (coin cell to USB), and provides a factory-set 2.5 V output with ±1.5% accuracy in WLCSP-20-P2 package. It is used in wearable health monitors requiring extended runtime from single-cell Li-ion or coin batteries.

For engineers reviewing the RP604Z251A-E2-F datasheet, RP604Z251A-E2-F pinout, RP604Z251A-E2-F application, or RP604Z251A-E2-F equivalent, key selection criteria include its 0.3 µA operating IQ, auto-discharge disable option, integrated 0.12 Ω PMOS/NMOS FETs, thermal shutdown at 140°C, and compatibility with 2.2 µH inductors and 22 µF ceramic output capacitors.

Technical Context

The RP604Z251A-E2-F implements a synchronous buck-boost topology with integrated high-side and low-side power MOSFETs (0.12 Ω typ. R_ON each), enabling bidirectional voltage conversion without external switches. Its VFM (Variable Frequency Modulation) control maintains >85% efficiency at 10 µA load while suppressing switching noise in sensitive analog sections.

It features independent analog and power ground pins (AGND/PVIN/AVIN), dual GND domains for noise isolation, and a dedicated VFB pin for precise output regulation. Protection includes UVLO (1.55 V release), OVP (6.0 V detection), LX peak-current limiting (900 mA), and thermal shutdown (140°C detect / 100°C release).

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	1.8 V to 5.5 V - supports single coin cell (e.g., CR2032), alkaline, or USB-powered systems without input pre-regulation
Output Voltage	2.500 V (factory-set, ±1.5%) - matches common MCU core/logic rails and sensor bias requirements
Quiescent Current	0.3 µA - enables multi-year operation on 100 mAh coin cells in sleep-dominated applications
Max Output Current	300 mA (buck mode) - sufficient to power BLE SoCs, low-power sensors, and display drivers intermittently
Switch R_ON	PMOS/NMOS = 0.12 Ω typ. @ 3.6 V - minimizes conduction loss and thermal rise in compact WLCSP layout
Standby Current	0.01 µA - ensures negligible battery drain during deep-sleep states when CE = low
Soft-start Time	20 ms - prevents inrush current into output capacitor, easing input supply stress

Pinout & Package

RP604Z251A-E2-F uses the WLCSP-20-P2 package (1.71 × 2.315 × 0.40 mm), a wafer-level chip-scale package with 20 solder bumps arranged in a 5×4 grid. It requires microvia PCB design and reflow-compatible assembly.

Pin/Terminal	Circuit Role	Design Meaning
A5, B5, C5	VOUT	Main regulated output node - connects directly to bulk output capacitor and load
A4, B4, C4	BOLX	Boost-mode switch node - drives external inductor during boost phase; requires low-ESR path to PGND
A3, B3, C3, D3	PGND	Power ground return for high-current switching paths - must be solid copper pour tied to thermal pad
A2, B2, C2	BULX	Buck-mode switch node - drives same inductor during buck phase; shares inductor with BOLX
A1, B1, C1	PVIN	Main power input - supplies internal regulators and power switches; decoupled with ≥10 µF ceramic
D1	AVIN	Analog power supply - powers error amplifier and reference; isolated from PVIN to reduce noise coupling
D2	CE	Active-high enable - logic-controlled on/off; 1.0 V min high threshold ensures robust noise immunity
D4	AGND	Analog ground - reference for VFB and internal bandgap; must be star-connected to AVIN and VFB
D5	VFB	Feedback input - senses output via resistor divider; internal 0.6 V reference enables 2.5 V setpoint with 1:3.167 ratio

Key Features

Feature	Design Value
Ultra-low IQ operation	0.3 µA enables >10-year battery life in devices with 1% duty cycle (e.g., hourly sensor reads)
Integrated dual-path FETs	0.12 Ω PMOS/NMOS R_ON eliminates need for 4 external MOSFETs and associated gate drivers
VFM light-load control	Variable frequency modulation maintains >80% efficiency down to 10 µA, avoiding audible switching noise
Dual-domain grounding	Separate AGND and PGND pins prevent digital switching noise from corrupting feedback accuracy
Auto-discharge disable	RP604Z251A variant omits discharge NMOS - preserves VOUT after shutdown for fast wake-up in always-on sensor nodes

Applications

Smart Wearable Sensors

BLE Peripheral Node

Use Scenario: Continuous heart-rate monitoring in wrist-worn fitness bands powered by CR2032 coin cell.

IC Role / Device Role / Timing Role: Primary power regulator converting 3.0 V battery to stable 2.5 V for optical sensor ASIC and MCU core.

Use Value: 0.3 µA IQ extends battery life to 3+ years; VFM mode avoids interference with photodiode signal chain.

Use Scenario: Compact temperature/humidity sensor node transmitting data every 5 seconds via Bluetooth Low Energy.

IC Role / Device Role / Timing Role: Buck-boost regulator supplying 2.5 V to nRF52832 SoC during active transmit bursts and deep-sleep states.

Use Value: 300 mA peak current supports RF PA operation; 0.01 µA standby current minimizes idle drain between transmissions.

Energy-Harvesting Edge Node

Medical Patch Monitor

Use Scenario: Solar-harvested power system using supercapacitor buffer and intermittent microcontroller wake-ups.

IC Role / Device Role / Timing Role: Wide-input (1.8–5.5 V) regulator maintaining 2.5 V rail as supercapacitor voltage drops from 4.2 V to 2.0 V.

Use Value: Seamless buck-boost transition prevents brownouts during capacitor discharge; UVLO hysteresis avoids oscillation near 1.6 V.

Use Scenario: Disposable ECG patch worn for 7 days, powered by thin-film lithium battery.

IC Role / Device Role / Timing Role: Primary power IC delivering 2.5 V to analog front-end and low-power ADC with <1.5% output tolerance.

Use Value: ±1.5% VOUT accuracy ensures consistent ADC reference; thermal shutdown protects against skin-contact overheating.

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS63802DRLR	Higher IQ (700 nA), lower max IOUT (2 A), no auto-discharge option, DSBGA-12 package	Optimized for higher-current portable audio; lacks factory-set 2.5 V option - requires external resistor divider	Select if >300 mA continuous load needed and board space allows larger package
MAX77654EWL+	Higher IQ (1.2 µA), triple-output PMIC, 1.2 mm × 1.6 mm WLP, integrated charger	Targets multi-rail wearables with battery charging; adds complexity and cost for single-rail use cases	Select only when simultaneous 2.5 V + 1.8 V + 3.3 V rails and charging are required

Compared with TPS63802DRLR and MAX77654EWL+, RP604Z251A-E2-F offers the lowest quiescent current (0.3 µA), smallest footprint (WLCSP-20-P2), and factory-trimmed 2.5 V output - making it optimal for space-constrained, ultra-long-life single-rail sensor nodes where minimal bill-of-materials and guaranteed accuracy are critical.

Availability

RP604Z251A-E2-F is available at Aetrix Electronics and suitable for wearable appliances, low-power wireless communication equipment, and energy-harvesting edge nodes requiring stable component supply and long-term manufacturability planning.

Supply support for RP604Z251A-E2-F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Ricoh Electronic Devices Co., Ltd. is a Japanese semiconductor manufacturer specializing in high-efficiency power management ICs for portable and battery-operated electronics.

The RP604x series was designed specifically for ultra-low-power intermittent-operation systems such as wearables and IoT endpoints, prioritizing sub-µA quiescent current, small WLCSP packaging, and seamless buck-boost transition across wide input ranges.

FAQ

What is the recommended inductor value and type for RP604Z251A-E2-F?

Use a 2.2 µH shielded power inductor rated for ≥900 mA saturation current and low DC resistance (e.g., TDK SPMT2520H2R2MT). The inductor must handle peak LX currents up to 900 mA without saturation; insufficient inductance causes overcurrent protection triggering and reduced efficiency. Ceramic capacitors (≥10 µF input, 22 µF output) are mandatory for stability.

Does RP604Z251A-E2-F support output voltages other than 2.5 V?

No - RP604Z251A-E2-F is factory-trimmed to 2.500 V (±1.5%) and does not support external feedback resistors. The "251" in the part number denotes 2.5 V (1.6–5.2 V in 0.1 V steps); alternative fixed outputs (e.g., 3.3 V) require different variants like RP604Z331A. No adjustable version exists in the Z-series.

How does the CE pin behavior affect system power sequencing?

The CE pin is active-high with 1.0 V minimum threshold. When pulled low, the device enters 0.01 µA standby mode - disabling switching but retaining VOUT via output capacitor hold-up. Rapid CE toggling (<100 ns edges) may cause transient overshoot; a 100 kΩ pull-down ensures clean disable. No external debouncing is required for typical GPIO control.

Is RP604Z251A-E2-F suitable for medical-grade applications?

RP604Z251A-E2-F meets standard industrial reliability specs but is not certified for life-critical medical use (e.g., implantables or ventilators). It is appropriate for Class II wearable diagnostics (e.g., ECG patches) where failure results in data loss, not harm - provided system-level redundancy, thermal derating, and safety isolation are implemented per IEC 62304.

RP604Z251A-E2-F Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Function:: -

Output Configuration:: -

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Voltage - Output (Min/Fixed):: -

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Current - Output:: -

Frequency - Switching:: -

Synchronous Rectifier:: -

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RP604Z251A-E2-F FAQ

1.How can I place an order for RP604Z251A-E2-F through Aetrix?

Please submit a Request for Quotation (RFQ) for RP604Z251A-E2-F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for RP604Z251A-E2-F reliable?

The price and inventory of RP604Z251A-E2-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RP604Z251A-E2-F is usually 5 days.

3.What payment methods are accepted for RP604Z251A-E2-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RP604Z251A-E2-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RP604Z251A-E2-F?

RP604Z251A-E2-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RP604Z251A-E2-F order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for RP604Z251A-E2-F?

For technical support, including RP604Z251A-E2-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RP604Z251A-E2-F requirements.

6.How does Aetrix verify that RP604Z251A-E2-F is sourced from the original manufacturer or authorized distributors?

All RP604Z251A-E2-F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that RP604Z251A-E2-F meets industry standards.

7.What is the process for return or replacement of RP604Z251A-E2-F?

All RP604Z251A-E2-F units undergo pre-shipment inspection (PSI). If there is an issue with RP604Z251A-E2-F, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The RP604Z251A-E2-F part is unused and in its original packaging.

Return procedure for RP604Z251A-E2-F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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