TPS54260是集成了200毫欧姆高边MOSFET的60V/2.5A降压稳压器, 电流模式控制简化了外部补偿和提供了方便选择元件.输入电压从3.5V到60V,工作静态电流138uA,关断电流1.3uA,开关频率100kHz到2.5MHz.主要应用在12V,24V和48V工业与通信低压电源,GSM和GPRS模块电源.本文介绍了TPS54260主要特性, 功能方框图, 输出3.3V和4.2V设计案例, 反向和分裂电源电路图,以及采用TPS54260开发的GSM/GPRS电源电路和材料清单, TPS54260EVM-597评估模块的性能指标,电路图和材料清单(BOM).
The TPS54260 device is a 60V, 2.5A, step down regulator with an integrated high side MOSFET. Current mode control provides simple external compensation and flexible component selection. A low ripple pulse skip mode reduces the no load, regulated output supply current to 138mA. Using the enable pin, shutdown supply current is reduced to 1.3mA, when the enable pin is low.
Under voltage lockout is internally set
at 2.5V, but can be increased using the enable pin. The output voltage startup ramp is controlled by the slow start pin that can also be configured for sequencing/tracking. An open drain power good signal indicates the output is within 94% to 107% of its nominal voltage.
A wide switching frequency range allows efficiency and external component size to be optimized. Frequency fold back and thermal shutdown protects the part during an overload condition. The TPS54260 is available in 10 pin thermally enhanced MSOP Power Pad™ package.
TPS54260主要特性:
3.5V to 60V Input Voltage Range
200-m
High-Side MOSFET
High Efficiency
at Light Loads with a Pulse Skipping Eco-Mode™
138µA Operating Quiescent Current
1.3µA Shutdown Current
100kHz to 2.5MHz Switching Frequency
Synchronizes to External Clock
Adjustable Slow Start/Sequencing
UV and OV Power Good Output
Adjustable UVLO Voltage and Hysteresis
0.8-V Internal Voltage Reference
MSOP10 Package With PowerPAD™
Supported by SwitcherPro™ Software Tool
TPS54260应用:12-V, 24-V and 48-V Industrial and Commercial Low Power Systems
GSM, GPRS Modules in Fleet Management, E-Meters, and Security Systems
图1.TPS54260功能方框图
图2.TPS54260输出3.3V设计案例
图2.TPS54260反向电源电路图
图3.TPS54260分裂电源电路图
图4.采用TPS54260的12V到3.8V的GSM电源电路图
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