The JTM2157 is a monolithic step-down switch mode converter with a built-in power MOSFET. It achieves 2A output current over a wide input supply range with excellent load and line regulation.Current

一,产品概述(General Description)      

     The JTM2157 is a monolithic step-down switch mode converter with a built-in power MOSFET.   It achieves 2A output current over a wide input supply
range with excellent load and line regulation.Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-by-cycle current limit and over temperature protection.
   The JTM2157 requires a minimum number of available standard external components.  The JTM2157 is available in TSOT-23-6 and SOT-23-6
packages


二</span>.产品特点(Features)

● 2A Output Current
● 180mù Internal Power MOSFET Switch
● Stable with Low ESR Output Ceramic Capacitors
● Up to 92% Efficiency
● Fixed 600KHz Frequency
● Current Mode Operation
● Over-Temperature Protection with Hiccup-Mode
● Cycle-by-Cycle Over Current Protection
● Wide 4.5V to 23V Operating Input Range
● Output Adjustable from 0.805V to 15V
● 10ìA Shutdown Current
● Available in TSOT-23-6 and SOT-23-6 Packages

三</span>,应用范围 (Applications)

● Battery Charger
● Pre-Regulator for Linear Regulator
● OLPC, Netbook
● Distributed Power System
● WLED Driver

四.技术</span>规格书下载（产品PDF）</span>


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JTM2217

五,产品封装图 (Package)



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六.电路原理图</span>




七</span>,功能概述


Absolute Maximum Ratings
● Input Supply Voltage (VIN) --------------------------------------------------------------------------------- +25V
● VSW -------------------------------------------------------------------------------------------------------------- -0.3V to VIN +0.3V
● VBS --------------------------------------------------------------------------------------------------------------- Vsw +6V
● All Other Pins Voltage -------------------------------------------------------------------------------------- -0.3V to +6V
● Maximum Junction Temperature (TJ) ------------------------------------------------------------------- +150°C
● Storage Temperature (TS) --------------------------------------------------------------------------------- -65°C to +150°C
● Lead Temperature (Soldering, 10sec.) ----------------------------------------------------------------- +260°C
● Power Dissipation @ TA=25°C, (PD)
SOT-23-6 ------------------------------------------------------------------------------------------- +0.4W
TSOT-23-6 ----------------------------------------------------------------------------------------- +0.4W
● Package Thermal Resistance, (èJA)
SOT-23-6 ------------------------------------------------------------------------------------------- +250°C/W
TSOT-23-6 ----------------------------------------------------------------------------------------- +250°C/W
● ESD Susceptibility
HBM (Human Body Mode) -------------------------------------------------------------------------------- 2KV
八,相关芯片选择指南
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