Renesas RAA458100GNP#HC0

Overview

RAA458100GNP from Renesas Electronics is a wireless power transmitter IC for low-power WPT systems, implementing bi-directional ASK communication with RAA457100 receivers, supporting half/full-bridge MOSFET gate driving at 125 kHz, and featuring integrated 12-bit ADC monitoring of bridge voltage (VSNS), current (via COMP), and dual NTC thermistors (THM1/THM2) - used in compact consumer charging pads and wearable device transmitters.

For engineers reviewing the RAA458100GNP datasheet, RAA458100GNP pinout, RAA458100GNP application, or RAA458100GNP equivalent, this page delivers verified technical context on ATPC mode operation, 3.0 V / 1.8 V regulators, protection thresholds (OCP at 2.2 V RCS drop, OVP at 5.7 V VSNS), and I²C interface timing (64 kHz max SCL) - all critical for WPT system validation and compliance with Qi v1.2.4 sub-5W specifications.

Technical Context

The RAA458100GNP integrates a PLL-based 128 MHz clock generator feeding a programmable 125 kHz bridge driver with configurable dead time and duty cycle (0–50%), plus ASK modulation/demodulation circuitry enabling closed-loop power control via receiver feedback packets. Its three operational modes - ATPC (EEPROM- or MCU-configured), Stand Alone (pin-strapped fixed duty), and MCU Control (full register access via I²C) - are selected by MS, ATPC, and DUTY6–DUTY8 pins.

On-chip 3.0 V and 1.8 V LDOs power analog and digital blocks respectively; a 12-bit ADC samples VSNS, COMP, THM1, and THM2 every 4 ms to feed overvoltage (5.7 V), overcurrent (2.2 V across RCS), and dual-thermistor temperature protections - each with user-adjustable thresholds and hysteresis stored in registers 0x15–0x1A and 0x29–0x2A.

Key Specifications

Pinout & Package

RAA458100GNP uses a 40-pin QFN package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad (EP) for enhanced power dissipation in compact WPT transmitters.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar wireless power transmitter applications.

Compared with STWBC2-HP and MP-A21, the RAA458100GNP uniquely combines pin-configurable operation modes, dual independent thermistor monitoring, and I²C master/slave versatility - making it optimal for cost-sensitive, thermally constrained, or firmware-light WPT designs under 5 W.

Availability

RAA458100GNP is available at Aetrix Electronics and suitable for wireless charging pads, smartwatch cradles, medical sensor chargers, and USB-powered desk docks requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for RAA458100GNP 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT markets.

The RAA458100GNP belongs to Renesas' Wireless Power Transmission product line, engineered specifically for low-power, Qi-compliant transmitter systems where integration, thermal safety, and flexible control modes reduce bill-of-materials and accelerate time-to-market.

FAQ

What are the supported operation modes of the RAA458100GNP and how are they selected?

The RAA458100GNP supports three operation modes: ATPC Mode (ATPC pin high), Stand Alone Mode (ATPC low + any DUTY6/DUTY7/DUTY8 high), and MCU Control Mode (ATPC low + all DUTY6–DUTY8 low). Mode selection is determined solely by hardware pin states at power-up or STBY assertion - no firmware or EEPROM required for Stand Alone or ATPC Mode initialization. The RAA458100GNP implements distinct startup flows and protection behaviors per mode, including automatic register loading from EEPROM only when MS = H in ATPC Mode.

How does the RAA458100GNP implement bi-directional communication with a receiver like RAA457100?

The RAA458100GNP uses dedicated ASKIN and ASKOUT pins to perform amplitude-shift keying modulation and demodulation, enabling Qi-compliant packet exchange with RAA457100 receivers. In ATPC Mode, it parses receiver-reported battery voltage and power demand from incoming packets to dynamically adjust bridge driver duty cycle. The RAA458100GNP can also write to RAA457100 registers (e.g., configuration, LED control) via the same link - confirmed by write-completion interrupts on INT_TX. This hardware-accelerated ASK engine operates independently of the I²C interface.

What thermal protection architecture does the RAA458100GNP provide, and how is it configured?

The RAA458100GNP features two independent thermal protection channels via THM1 and THM2 pins, each connected to a separate NTC thermistor and sampled by the 12-bit ADC. Thresholds and hysteresis are set via registers 0x17–0x1A and 0x29–0x2A, allowing distinct trip points for coil and power-stage monitoring. When triggered, the bridge driver stops and - in ATPC Mode - performs an automatic restart with initial duty; in Stand Alone or MCU Mode, restart occurs only after temperature falls below the hysteresis level. The RAA458100GNP thus enables spatially resolved thermal management without external comparators.

Can the RAA458100GNP drive both half-bridge and full-bridge topologies, and what pin controls this?

Yes, the RAA458100GNP supports both half-bridge and full-bridge configurations via the BRGSEL pin: BRGSEL = H enables GD1H/GD1L only (half-bridge), while BRGSEL = L activates all four gate drivers (GD1H/GD1L/GD2H/GD2L) for full-bridge operation. Dead time, duty cycle, and frequency are fully programmable per leg through registers 0x04–0x0C and 0x0D. The RAA458100GNP's driver outputs are rated for ±5 mA sink/source, compatible with standard Nch/Pch MOSFET gates, and include soft-start functionality to limit inrush current during mode transitions.

What protection functions are implemented in the RAA458100GNP, and how are their thresholds adjusted?

The RAA458100GNP implements UVLO (3.9 V), OVP (5.7 V on VSNS), OCP (2.2 V across RCS), SCP (latch-stop), dual thermal shutdown (THM1/THM2), and maximum duty limiting. All thresholds except UVLO and OVP are software-configurable via registers: OCP level via 0x15–0x16, thermal trips via 0x17–0x1A and 0x29–0x2A, and max duty via 0x13–0x14. Detection delays are scaled by register multipliers (e.g., 16 ms × 0x36[3:0]), enabling precise fault response tuning. The RAA458100GNP reports all events via INT_TX and status registers 0x1B–0x1D, supporting both autonomous and host-coordinated recovery.