Renesas RAA230409GFT#BA0

Overview

RAA230409GFT#BA0 from Renesas Electronics is a 3-channel synchronous step-down switching regulator with integrated power MOSFETs and one LDO channel, designed for multi-rail power management in space-constrained embedded systems. It delivers 500 mA (ch1), 100 mA (ch2), and 1500 mA each (ch3/ch4) across an input range of 2.5 V to 5.5 V, with ch1 and ch3–ch4 operating at 1.3–2 MHz and ch2 providing low-noise linear regulation. It is used in industrial IoT edge nodes requiring independent rail sequencing and adjustable output voltages.

For engineers reviewing the RAA230409GFT#BA0 datasheet, RAA230409GFT#BA0 pinout, RAA230409GFT#BA0 application, or RAA230409GFT#BA0 equivalent, key selection criteria include its per-channel ON/OFF control, external resistor–based output voltage adjustability (ch1, ch3, ch4), thermal shutdown (≥150°C), and integrated soft-start with discharge circuit - all in a 32-pin TQFP package.

Technical Context

The RAA230409GFT#BA0 implements current-mode PWM control for ch1, ch3, and ch4, with internal phase compensators optimized for ceramic output capacitors ≥22 µF. Each buck channel integrates high-side and low-side MOSFETs (R_ON-P/R_ON-N ≤ 0.6 Ω), while ch2 uses a foldback-current-limited LDO with 0.5 V dropout at 20 mA. The IC supports independent enable control via SHDNB0–SHDNB4 pins and configurable sequencing through soft-start timing (adjustable via SS pin resistance).

It features a shared SCP pin enabling timer-latch short-circuit protection across ch1/ch3/ch4, triggered when IIx pin voltage drops below 75% of nominal output. Thermal shutdown and UVLO (1.9–2.3 V turn-on) are also latch-type, resettable only by toggling SHDNB0 or cycling AVDD below 1.7 V. The SAVE pin enables low-power mode, reducing ch1/ch3/ch4 switching frequency to 15% of nominal (e.g., ~300 kHz at 2 MHz setting) to cut quiescent current to 0.7–1.0 mA.

Key Specifications

Pinout & Package

RAA230409GFT#BA0 is housed in a 32-pin TQFP (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Renesas datasheet R18DS0004EJ0102 Rev. 1.02, including dedicated VPINx inputs, LOUTx inductor connections, PGNDx/AGND separation, and independent SHDNBx controls.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-output power management applications.

Compared with TPS65218D0RSLR and ISL9305IRTNZ-T, RAA230409GFT#BA0 uniquely combines externally adjustable outputs on three buck channels, per-rail discharge, thermal/short-circuit latch protection coordinated via one SCP pin, and a dedicated low-power mode - making it optimal for industrial and medical applications demanding configurability, safety, and extended battery life.

Availability

RAA230409GFT#BA0 is available at Aetrix Electronics and suitable for industrial automation controllers, medical wearables, automotive body electronics, and smart home gateways requiring stable component supply and long-term production continuity.

Supply support for RAA230409GFT#BA0 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 specializing in microcontrollers, analog power, and embedded solutions for industrial, automotive, and IoT markets.

The RAA23040x series was developed to address multi-rail power needs in space-constrained embedded systems, emphasizing configurability (adjustable outputs), safety (latch-type protections), and efficiency (synchronous buck + LDO integration) for next-generation edge devices.

FAQ

What output voltage options does the RAA230409GFT#BA0 support?

The RAA230409GFT#BA0 supports externally adjustable outputs on ch1, ch3, and ch4 using a resistor divider referenced to a 0.8 V internal threshold; ch2 is a fixed-output LDO. ch4's mode (fixed 1.2 V vs. adjustable) is selected by the CTL4 pin. Unlike earlier RAA23040x variants with preset internal resistors, RAA230409GFT#BA0 is specifically configured for external adjustment on ch1 and ch3–ch4, enabling flexible rail design without BOM changes.

How does the RAA230409GFT#BA0 handle thermal faults?

The RAA230409GFT#BA0 incorporates a timer-latch thermal shutdown circuit that triggers at ≥150°C junction temperature. Upon activation, it charges the capacitor on the SCP pin until 0.9 V is reached, then latches all channel outputs OFF while keeping reference and oscillator blocks active. Recovery requires toggling SHDNB0 or cycling AVDD below 1.7 V - ensuring fault persistence until root cause is addressed, unlike auto-recovery designs.

Can the RAA230409GFT#BA0 be used without the short-circuit protection (SCP) function?

Yes - when SCP is unused, the SCP pin must be connected directly to AGND per datasheet guidance (page 20). However, doing so disables both short-circuit and thermal latch protection, as both share the same SCP timing capacitor and latch mechanism. Users must implement external thermal monitoring or accept higher risk of undetected overloads, especially in unattended industrial deployments.

What is the role of the SAVE pin on the RAA230409GFT#BA0?

The SAVE pin enables low-power mode: when driven high, it reduces the switching frequency of ch1, ch3, and ch4 to 15% of their nominal value (e.g., ~300 kHz from 2 MHz), cutting total operating current to 0.7–1.0 mA. This mode is intended for light-load conditions (<100 mA per buck channel) and trades off higher output ripple for significantly improved battery life in sleep or standby states of the RAA230409GFT#BA0-powered system.

How is power-good signaling implemented on the RAA230409GFT#BA0?

RAA230409GFT#BA0 provides a dedicated open-drain PG1 output for ch1 only, asserting low when ch1's output falls below 90% of its nominal voltage and reverting to HiZ when regulation is restored. It requires an external pull-up resistor and must be connected directly to ch1's output per datasheet caution (page 16). No power-good signals are provided for ch2–ch4, necessitating external monitoring if needed.