RT8077GQW - 2A, 2MHz Sync Step-Down Converter | Richtek
料号： RT8077GQW ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.85 | $0.85 |
| 10 | $0.74 | $7.40 |
| 100 | $0.62 | $62.00 |
| 500 | $0.51 | $255.00 |
| 1,000 | $0.43 | $430.00 |
| 3,000 | $0.36 | $1,080.00 |
RT8077GQW 概述
A synchronous buck converter (also called a step-down switching regulator) is a switched-mode power supply topology that converts a higher DC input voltage to a lower DC output voltage using two MOSFET switches, an inductor, and output capacitance. Compared to linear regulators, buck converters achieve 90-95% efficiency at moderate load currents because they cycle energy through an inductor rather than dissipating it as heat. Synchronous buck converters replace the conventional rectifier diode with a low-Rdson MOSFET to further reduce conduction loss. Within the power management IC hierarchy, this places the RT8077GQW in the DC-DC converter family, which sits above simple LDO regulators and below system PMICs in terms of integration and complexity.
Key features include 2 A continuous output current, a programmable switching frequency up to 2 MHz (which keeps the inductor and capacitors very small), 100% duty-cycle low-dropout operation, internal soft-start, cycle-by-cycle current limit, and thermal shutdown. The exposed-pad WDFN-8 package provides a low thermal resistance path, enabling 2 A delivery without an external heatsink in typical 3.3 V to 1.8 V or 3.3 V to 1.2 V point-of-load applications.
The RT8077GQW uses a peak current-mode control architecture with internal compensation, which simplifies the external BOM to a minimum of five components: input capacitor, output capacitor, inductor, feedback resistor divider, and frequency-setting resistor. The high 2 MHz switching frequency minimizes output ripple and allows the use of a small 1 µH to 2.2 µH chip inductor, which is essential in space-constrained portable and wearable designs.
Typical applications include single-cell Li-ion powered portable devices, USB-powered peripherals, set-top box and HDTV point-of-load rails, solid-state drive (SSD) power, and FPGA/CPU core voltage generation in 5 V input systems. The wide 2.6 V to 5.5 V input covers both USB 5 V and single-cell Li-ion (3.0 V to 4.2 V) rails directly without a pre-regulator.
When designing with this part, select the inductor based on the chosen switching frequency and ripple target - typically 1 µH to 2.2 µH at 2 MHz with less than 30% peak-to-peak inductor current ripple. Place the input ceramic capacitor as close as possible to the PGND and VIN pins to minimize switching-node ringing.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： RT8077GQW ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： RT8077GQW （相同外形与封装尺寸） ——差异在于 Input Voltage Range, Output Voltage Range, Package, Switching Frequency, Topology.
快速对比工具——选择替代料号进行并排对比：
RT8077GQ
✅ 直接替换📋 参考替代料（不在目录中）
RT8077GQW-00
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
RT8077ZQW
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TPS62133RGTR
✅ 直接替换📋 参考替代料（不在目录中）
MP2155GJ-Z
✅ 直接替换📋 参考替代料（不在目录中）
RT8015AGQW
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
RT8077GQW 最大额定值与电气特性
| 拓扑 | Synchronous Buck (Step-Down) |
| 输入电压范围 | 2.6 V to 5.5 V |
| 输出电压范围 | 0.8 V to 5 V (adjustable) |
| Output Current | 2 A continuous |
| 开关频率 | Up to 2 MHz (programmable, resistor-set) |
| Maximum Duty Cycle | 100% (low-dropout operation) |
| Control Architecture | Peak current-mode with internal compensation |
| Internal Switches | Synchronous low-Rdson MOSFETs (no Schottky required) |
| 软启动 | Internal |
| 限流 | Cycle-by-cycle |
| Thermal Protection | Thermal shutdown |
| 封装 | 8-WDFN Exposed Pad (WDFN-8 2x2 mm) |
| 安装类型 | Surface Mount |
| 工作温度 | -40 °C to +85 °C (TA) |
| MSL 等级 | 1 |
| RoHS 状态 | Compliant |
RT8077GQW 引脚配置
| 引脚 1 | BST — Bootstrap capacitor pin for the high-side gate driver |
| 引脚 2 | IN — Input supply voltage (2.6 V to 5.5 V) |
| 引脚 3 | SW — Switch node - connected to the external inductor |
| 引脚 4 | FB — Feedback input for output voltage regulation (0.8 V reference) |
| 引脚 5 | EN — Enable input (active high) |
| 引脚 6 | RT — Frequency setting resistor to ground |
| 引脚 7 | PGND — Power ground for synchronous rectifier |
| 引脚 8 | AGND — Analog ground - connect to PGND at one point |
典型应用
RT8077GQW 适用于 6 应用s: Single-Cell Li-ion Portable Devices, USB-Powered Peripherals and Dongles, Solid-State Drive (SSD) Power, Set-Top Box and HDTV Point-of-Load Rails, FPGA and Microcontroller Core Voltage Rails, IoT and Smart Home Sensor Hubs.
Single-Cell Li-ion Portable Devices
The RT8077GQW is ideal for single-cell Li-ion powered portable devices because its 2.6 V to 5.5 V input range covers the entire Li-ion discharge curve (3.0 V to 4.2 V) without a pre-regulator. At a typical 3.7 V battery to 1.8 V core rail conversion at 2 A load, the synchronous architecture delivers roughly 90% efficiency versus 50% for an LDO, extending battery runtime by 30-40%. The 2 MHz switching frequency and 1.5 µH chip inductor fit easily inside smartphones, tablets, and wearables where PCB area is severely constrained. Place the device between the battery protection FET output and the SoC/PMIC input rail with a 22 µF input cap and 22 µF output cap to meet load-transient requirements of modern application processors.
推荐
USB-Powered Peripherals and Dongles
The RT8077GQW drops directly off a USB 5 V rail to generate 3.3 V or 1.8 V system rails at up to 2 A. Its 5.5 V maximum input tolerates USB hot-plug transients, and the 2 MHz switching frequency avoids interference with the 27 MHz reference clocks common in USB peripherals. A 4.7 µF to 22 µF input ceramic cap plus a 22 µF output cap and 1.5 µH inductor form a minimal 5-component BOM that fits USB stick form factors. Compared to a 5 V to 3.3 V LDO, the RT8077GQW saves 1.7 V x 2 A = 3.4 W of dissipation, which is critical in sealed plastic enclosures without airflow.
推荐
Solid-State Drive (SSD) Power
The RT8077GQW suits SSD power architectures that require a compact 3.3 V to 1.2 V or 1.8 V core rail at 1 A to 2 A with tight regulation. SSD controllers and NAND flash demand clean low-voltage rails; the peak current-mode control with internal compensation gives fast transient response to sudden NAND write-current spikes. The WDFN-8 2x2 mm footprint fits M.2 2230/2242 form factors where board area is measured in square millimeters. Pair the RT8077GQW with input/output ceramic caps rated for 6.3 V or higher and a 1.5 µH inductor with >3 A saturation rating for reliable 2 A operation.
推荐
Set-Top Box and HDTV Point-of-Load Rails
The RT8077GQW generates point-of-load rails for SoCs, DDR memory, and HDMI transceivers inside set-top boxes and HDTVs. The 5 V input from the main power supply drops to 3.3 V, 1.8 V, or 1.2 V with high efficiency, reducing thermal stress inside sealed plastic enclosures without forced airflow. The 100% duty-cycle low-dropout operation prevents output droop during heavy SoC load steps. Multiple RT8077GQW instances can be paralleled through separate rails (sequenced via EN pins) to power core, IO, and DDR subsystems independently, an architecture typical in Broadcom-based STB designs.
推荐
FPGA and Microcontroller Core Voltage Rails
The RT8077GQW provides a 5 V to 1.0 V or 1.2 V core rail at up to 2 A for small FPGAs, low-power MCUs, and ASIC prototypes. The internal synchronous switches and 2 MHz frequency minimize output ripple below 20 mV peak-to-peak, which is critical for low-power FPGA core supplies that are sensitive to ripple-induced jitter. The exposed pad WDFN-8 package dissipates up to 1 W without a heatsink, sufficient for 5 V to 1.2 V at 1 A. The EN pin enables power sequencing with respect to other rails (e.g., 3.3 V IO before 1.2 V core) required by most modern FPGA reference designs.
推荐
IoT and Smart Home Sensor Hubs
The RT8077GQW powers IoT sensor hubs that combine Zigbee, Thread, BLE, or Wi-Fi radios with multiple sensors. Its 2 A capability handles radio TX current peaks of 200-400 mA while still supplying a sensor MCU and peripherals. The 2.6 V to 5.5 V input range accepts both USB-C 5 V and 3.3 V system rails, simplifying dual-input designs. The high switching frequency and small inductor keep the converter footprint below 25 mm², leaving PCB area for antenna and sensor placement. The internal soft-start prevents inrush current that could otherwise trip USB current-limit switches at plug-in events.
推荐
推荐产品汇总
工程参考数据： RT8077GQW ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | RT8077GQ | RT8077ZQW | RT8015AGQW | TPS62133RGTR | MP2155GJ-Z |
|---|---|---|---|---|---|---|
| Brand | Richtek | Richtek | Richtek | Richtek | Texas Instruments | Monolithic Power Systems |
| Package | WDFN-8 (2x2 mm) | WDFN-8 (2x2 mm) - same | WDFN-8 (2x2 mm) - same | WDFN-8 (2x2 mm) - same | QFN-8 (3x3 mm) | TSOT23-8 |
| Input Voltage Range | 2.6 V to 5.5 V | 2.6 V to 5.5 V | 2.6 V to 5.5 V | 2.5 V to 5.5 V | 3.0 V to 6.0 V | 2.5 V to 6.0 V |
| Output Voltage Range | 0.8 V to 5 V | 0.8 V to 5 V | 0.8 V to 5 V | 0.8 V to 5 V | 0.9 V to 6.0 V (adj) | 0.6 V to 5 V |
| Output Current | 2 A | 2 A | 2 A | 1.5 A | 2 A | 2 A |
| Switching Frequency (max) | 2 MHz | 2 MHz | 2 MHz | 1.5 MHz | 3 MHz | 4 MHz |
| Maximum Duty Cycle | 100% | 100% | 100% | 100% | 100% | 100% |
| Control Architecture | Peak current-mode | Peak current-mode | Peak current-mode | Peak current-mode | DCS-Control (voltage mode-like) | Peak current-mode |
| External Schottky Required | No (internal sync switch) | No | No | No | No | No |
关键差异点
- Wider maximum input voltage headroom than TPS62133RGTR （对比 TPS62133RGTR)
- Higher output current than RT8015AGQW same-brand （对比 RT8015AGQW)
- Pin-compatible family members within Richtek portfolio （对比 RT8077GQ)
设计说明
Place the input ceramic capacitor (typically 22 µF X5R 6.3 V) as close as possible to the IN and PGND pins to minimize switching-node ringing. The exposed thermal pad must be soldered to a ground copper pour of at least 50 mm² to keep junction temperature within safe limits at 2 A continuous load. Route the SW trace away from sensitive analog traces and keep it short - a long SW trace acts as an antenna and injects EMI into nearby signal lines.
At full 2 A load with a 5 V to 1.8 V conversion, the RT8077GQW dissipates roughly 0.5 W (90% efficiency). At higher VIN/VOUT differentials like 5 V to 1.0 V, dissipation rises to about 1.0 W, requiring the thermal pad to be connected to a 100 mm² ground pour to maintain junction temperature below 100 °C. Do not exceed 85 °C ambient for continuous 2 A operation without active cooling or a larger copper pour.
Do not omit the bootstrap capacitor on the BST pin - a 0.1 µF ceramic from BST to SW is required for the high-side gate drive. Using an inductor with insufficient saturation current (< 3 A for 2 A applications) causes subharmonic oscillation and reduced efficiency. Avoid using electrolytic output capacitors - the RT8077GQW is designed for low-ESR ceramic output caps and may oscillate with high-ESR loads.
Use a single-point ground connection between AGND and PGND - tie them together at one place on the PCB under the IC, not at multiple points, to avoid ground bounce. Place the feedback resistor divider close to the FB pin and keep the trace short to prevent noise pickup on the high-impedance feedback node. The RT resistor to ground should also be placed near the RT pin with minimal trace length.
合规信息
RoHS compliant per Richtek product page and IPC/JEDEC J-STD-020. Not AEC-Q100 qualified; automotive applications should evaluate AEC-Q100 alternatives.
