双配电开关和5.5 V至18 V的输入电压,固定5V输出电压,单片式同步降压稳压器和 DUAL POWER DISTRIBUTION SWITCH AND MONOLITHIC SYNCHRONOUS BUCK REGULATOR WITH 5.5-V TO 18-V INPUT VOLTAGE, FIXED 5-V OUTPUT VOLTAGE AND
The TPS65280 incorporates dual N-channel MOSFET power switches for USB power distribution systems that require dual power switches in a single package. It also integrates a buck converter which regulates an accurate 5-V output voltage from a 5.5-V to 18-V power bus to supply the power for power switches. The device is intended to provide a total USB power distribution solution for digital TV, set-top boxes, VOIP phones and tablet PC applications, where precision current limiting is required or heavy capacitive loads or short circuits are encountered.
A dual 85-mΩ independent power distribution switch limits the output current to a typical 1.2 A manufacture trim 0.8 A, 1.6 A, and 2 A available options when output current load exceeds the current limit threshold. TPS65280 device limits output current to a safe level by using a constant current mode when output load exceeds the current limit threshold. After delitching time, TPS65280 provides circuit breaker functionality by latching off the power switch during over-current or reverse-voltage situations. Two back-to-back power MOSFETs prevent the current injects from output to input in shutdown. An internal reverse-voltage comparator disables the power switch when the output voltage is driven higher than the input to protect the circuits on the input side of the switch in normal operation. The nFAULT1/2 output asserts low during over-current and reverse-voltage conditions.
The buck DC/DC converter integrates power MOSFETs for optimized power efficiency and reduced external component count for a fixed 5-V output voltage. A wide 5.5-V to 18-V input supply range to buck encompasses most intermediate bus voltages operating off a 9-V, 12-V or 15-V power bus. Constant frequency peak current mode control simplifies the compensation and fast transient response. Equipped with enable and soft-start pins, the DC/DC can be precisely sequenced and ramp up in order to align with other rails in the system. Cycle-by-cycle over-current protection and operating in hiccup mode limit MOSFET power dissipation during buck output short circuit or over loading fault conditions. The switching frequency of the converter can be programmed from 300 kHz to 1.4 MHz with an external resistor at the ROSC pin. With the ROSC pin connecting to the V7V pin, floating, or grounding, a default fixed switching frequency can be selected to reduce the external component. The internal oscillator can be synchronized with a free-run external clock in frequency.
When continuous heavy overload or short circuit increases power dissipation in the buck converter or power switches, the internal thermal protection circuit shuts off both the buck regulator and power switches to prevent damage. Recovery from a thermal shutdown is automatic once the device has cooled sufficiently.
The TPS65280 is available in a 24-lead thermally enhanced QFN RGE 4-mm × 4-mm thin package.
电源电压DC 18.0 V
输出接口数 1
输出电压 5 V
输出电流 4 A
静态电流 800 µA
调节输出数 1
拓扑结构 Buck
输入电压Max 18 V
输入电压Min 5.5 V
输出电流Max 4 A
工作温度Max 85 ℃
工作温度Min -40 ℃
电源电压 5.5V ~ 18V
输入电压 5.5V ~ 18V
安装方式 Surface Mount
引脚数 24
封装 VQFN-24
封装 VQFN-24
工作温度 -40℃ ~ 85℃
产品生命周期 Active
包装方式 Tape & Reel TR
RoHS标准 RoHS Compliant
含铅标准 Lead Free
REACH SVHC标准 No SVHC
REACH SVHC版本 2014/12/17
ECCN代码 EAR99
型号/品牌 | 代替类型 | 替代型号对比 |
---|---|---|
TPS65280RGER TI 德州仪器 | 当前型号 | 当前型号 |
ADP2384ACPZN-R7 亚德诺 | 功能相似 | TPS65280RGER和ADP2384ACPZN-R7的区别 |