RT9711CGB - 80mΩ, 600mA USB High-Side Power Switch | Richtek
部品番号: RT9711CGB ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.65 | $0.65 |
| 10 | $0.55 | $5.50 |
| 100 | $0.42 | $42.00 |
| 500 | $0.34 | $170.00 |
| 1,000 | $0.28 | $280.00 |
| 3,000 | $0.22 | $660.00 |
RT9711CGB 概要
A high-side power switch (also called a load switch or power distribution switch) is a semiconductor that sits between a system rail and a downstream load, providing controlled turn-on, fault protection, and isolation. In USB applications, these switches implement per-port current limiting and over-current protection, sitting above the system hierarchy as a sub-class of power management ICs (PMIC) and ultimately belonging to the broader semiconductor / integrated circuit family.
The RT9711CGB features 1.5A continuous / 0.6A continuous current ratings depending on operating conditions, low quiescent current, over-current protection, over-temperature shutdown, under-voltage lockout, and an open-drain FLAG signal that asserts when a fault occurs. The low RDS(ON) of 80mΩ minimizes voltage drop and conduction loss on the VBUS rail, while the FLAG output simplifies fault reporting back to the USB host controller or system MCU.
Typical applications include USB downstream ports, USB hubs, self-powered and bus-powered USB peripherals, hot-plug power rails, and any system requiring controlled load switching with fault indication. The SOT-23-5 footprint is one of the smallest USB switch packages available, enabling high port density on hub PCBs.
When designing with the RT9711CGB, place input and output bypass capacitors as close to the IC as possible to suppress transient ringing during turn-on. The FLAG pin requires a pull-up resistor; an RC delay network can be added to debounce transient faults. Always observe the datasheet's SOA curve when sizing upstream protection.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
ドロップイン代替品: RT9711CGB — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
RT9711AGB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
RT9711BGB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
RT9711DGB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MIC2026-1YM
✅ ドロップイン📋 参考代替品（カタログ未掲載）
TPS2051BDR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
NCP380LSN05AGEVB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
RT9711CGB 最大定格＆電気的特性
| 機能 | High-Side Power Switch / Load Driver |
| Switch Type | N-Channel MOSFET (1:1) |
| RDS(ON) | 80 mΩ (typ) |
| Continuous Load Current | 0.6 A |
| Maximum Load Current | 1.5 A |
| 入力電圧範囲 | 2.7 V to 5.5 V |
| 出力電圧 | Up to 5.5 V |
| FLAG Output | Yes (open-drain fault indicator) |
| Fault Protection | Over-current, Over-temperature, UVLO |
| 動作温度 | -40 °C to +125 °C (TJ) |
| パッケージ | SOT-23-5 (GB) |
| 実装タイプ | Surface Mount |
| Lead-Free | Yes |
| Application | USB High-Side Power Switch |
RT9711CGB ピン構成
| ピン 1 | OUT — Switch output to load |
| ピン 2 | GND — Ground |
| ピン 3 | FLAG — Open-drain fault indicator (asserts low on OCP/OTP) |
| ピン 4 | EN — Enable input (active-high per Richtek datasheet for RT9711C variant) |
| ピン 5 | IN — Input supply voltage (2.7 V to 5.5 V) |
主な用途
RT9711CGB の用途: 6 件s: USB 2.0 Downstream Port Switch, USB Self-Powered Hub Port Power Management, Hot-Plug Power Rail Control, Portable USB Charger Output Switch, Industrial Sensor Module Power Switching, USB Peripheral Power Domain Isolation.
USB 2.0 Downstream Port Switch
The RT9711CGB is purpose-built for USB 2.0 downstream port switching in self-powered and bus-powered hubs. With 80 mΩ RDS(ON), the voltage drop at 500 mA is 40 mV, well below the 330 mV USB spec budget and preserving the 4.75-5.25 V VBUS tolerance. Its integrated charge pump fully enhances the internal N-MOSFET, eliminating the need for an external P-MOSFET. The open-drain FLAG output asserts low during over-current or over-temperature events, allowing the hub controller to enumerate and disable individual ports. Compared to a discrete P-MOSFET + fuse design, the RT9711CGB saves roughly 50 mm² of PCB area and adds automatic fault recovery. Place a 100 µF bulk capacitor on VBUS and 1 µF ceramic on OUT to suppress inrush current during hot-plug events.
おすすめ
USB Self-Powered Hub Port Power Management
In a self-powered USB hub, each downstream port needs independent switching, current limiting, and fault isolation. The RT9711CGB provides 0.6 A continuous current per port with 1.5 A peak for inrush tolerance when devices enumerate. Its UVLO prevents back-powering from VBUS to the upstream port when the hub loses its external supply. With 80 mΩ RDS(ON), four RT9711CGBs in a 4-port hub dissipate about 0.16 W total at full USB load, requiring no heatsink on a standard 4-layer PCB. The FLAG pins from each port can be wire-OR'd to a single hub-controller interrupt pin, simplifying GPIO usage. This part is widely used in industrial USB hubs, docking stations, and monitor-integrated USB ports.
おすすめ
Hot-Plug Power Rail Control
The RT9711CGB can switch any 2.7-5.5 V power rail in a hot-plug scenario, providing controlled turn-on, inrush limiting, and fault isolation between the source and load. Compared to a discrete N-MOSFET + gate driver, the integrated solution saves BOM cost and PCB area. The 80 mΩ RDS(ON) minimizes steady-state loss, while the FLAG output gives immediate notification of downstream shorts or thermal faults. Typical uses include powering plug-in sensor modules, expansion cards, and removable storage devices in embedded systems. Add a 10 µF output capacitor to soften turn-on transients and prevent false OCP triggers during load step events.
おすすめ
Portable USB Charger Output Switch
Portable USB chargers, power banks, and travel adapters use the RT9711CGB as the output protection switch on the Type-A downstream port. Its 80 mΩ RDS(ON) keeps conduction loss below 1% at 2.1 A charging currents, improving overall charger efficiency. Over-temperature protection shuts the port down if a shorted cable causes the die temperature to exceed 150 °C, then auto-recovers when the fault clears. The small SOT-23-5 footprint is critical in compact charger housings where PCB area is at a premium. Pair with a Microchip MCP73871 Li-Ion charge controller for a complete 1S power-bank reference design.
おすすめ
Industrial Sensor Module Power Switching
In industrial sensor modules and PLCs, the RT9711CGB provides galvanically isolated, fault-protected 5 V switching for downstream sensors, actuators, and field-bus transceivers. With -40 °C to +125 °C operating junction temperature, it handles factory-floor thermal extremes. The FLAG pin can drive a PLC digital input to alert the controller when a downstream short occurs, enabling predictive maintenance. The 80 mΩ RDS(ON) keeps voltage drop below 50 mV at full load, ensuring sensors receive a clean 5.0 V supply. Compared to electromechanical relays, the RT9711CGB switches in microseconds, supports millions of cycles, and eliminates contact bounce.
おすすめ
USB Peripheral Power Domain Isolation
When a USB peripheral needs to isolate its internal 3.3 V or 5 V rail from the upstream VBUS during suspend states, the RT9711CGB serves as the isolation switch. Its UVLO prevents the peripheral from back-driving VBUS when the host is powered down, a critical requirement for USB compliance. The 80 mΩ RDS(ON) minimizes the voltage drop from VBUS to the internal rail, allowing the peripheral to operate directly from USB power without a separate boost converter. The FLAG output can wake the MCU when VBUS is re-applied, enabling fast attach detection and reducing enumeration latency.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: RT9711CGB — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | RT9711AGB | RT9711BGB | RT9711DGB | MIC2026-1YM | TPS2051BDR |
|---|---|---|---|---|---|---|
| Package | SOT-23-5 (GB) | SOT-23-5 (GB) | SOT-23-5 (GB) | SOT-23-5 (GB) | SOT-23-5 | SOT-23-5 |
| Brand | Richtek Technology | Richtek Technology | Richtek Technology | Richtek Technology | Microchip Technology | Texas Instruments |
| RDS(ON) | 80 mΩ | 80 mΩ | 80 mΩ | 80 mΩ | 90 mΩ | 80-100 mΩ |
| Continuous Load Current | 0.6 A | 0.6 A | 0.6 A | 0.6 A | 0.5 A | 0.5 A |
| Peak Load Current | 1.5 A | 1.5 A | 1.5 A | 1.5 A | 1.2 A | 1.0 A |
| Enable Polarity | Active-High (RT9711C variant) | Active-High | Active-Low | Active-Low | Active-High | Active-High |
| FLAG Output | Yes (open-drain, active-low) | Yes | Yes | Yes | Yes | Yes (OC) |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Approx. Unit Price (qty 100) | $0.42 | $0.40-0.45 | $0.40-0.45 | $0.40-0.45 | $0.55-0.65 | $0.70-0.90 |
主な差別化要因
- Integrated charge pump for true N-MOSFET enhancement （vs MIC2026-1YM)
- Extended -40 °C to +125 °C operating temperature range （vs TPS2051BDR)
- Lower cost at volume （vs TPS2051BDR)
設計ノート
Do not omit the FLAG pull-up resistor. The FLAG output is open-drain and requires a pull-up (typically 10 kΩ to VCC) to function. Forgetting this resistor is the most common RT9711CGB design mistake and results in no fault indication ever reaching the host controller. Per Richtek datasheet, FLAG asserts low during OCP or OTP events.
Estimated: at 0.6 A continuous load with VIN=5.0 V and 80 mΩ RDS(ON), conduction loss is approximately 0.029 W (I² × R = 0.36 × 0.08). The SOT-23-5 θJA is roughly 250 °C/W per JEDEC EIA/JESD51 conditions, yielding a junction temperature rise of about 7 °C above ambient - well within the 125 °C rating. No heatsink is required at rated current on a standard 2 oz 4-layer PCB.
Place a 1 µF X7R ceramic bypass capacitor on IN (pin 5) and a 1 µF X7R ceramic on OUT (pin 1) within 3 mm of the IC. For USB applications, add a 120 µF low-ESR bulk capacitor on VBUS to meet USB 2.0 inrush requirements. Wide ground pour around GND (pin 2) and a thermal via to an internal ground plane are recommended for heat dissipation.
コンプライアンス情報
RoHS compliant and lead-free per Richtek product page. AEC-Q100 not applicable (consumer/industrial USB switch, not automotive-grade). Halogen-free status not explicitly stated in verified data.
