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目录low嘉泰姆

1.产品概述                       2.产品特点low嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 low嘉泰姆
5.产品封装图                     6.电路原理图                   low嘉泰姆
7.功能概述                        8.相关产品low嘉泰姆

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一,产品概述(General Description)      low嘉泰姆

     The JTM2234 is a fully in tegrated , high-efficiency  2.0A  synchronous  rectified step-down  converter.  The JTM2234 operates at high efficiencylow嘉泰姆
over a wide output current load range.low嘉泰姆

      This device offers two operation modes,PWM control and PFM Modelow嘉泰姆
switching control, which allows a high efficiency over the wider range of thelow嘉泰姆
load.The  rber of readily available standard external components and islow嘉泰姆
available in an 6-pin SOT23 ROHS compliant package.low嘉泰姆

二.产品特点(Features)low嘉泰姆

* High Efficiency: Up to 95%low嘉泰姆
* 600KHz Frequency Operationlow嘉泰姆
* 2.0A Output Currentlow嘉泰姆
* No Schottky Diode Requiredlow嘉泰姆
* 3.5V to 18V Input Voltage Rangelow嘉泰姆
* 0.6V Referencelow嘉泰姆
 Slope Compensated Current Modelow嘉泰姆
 Control for Excellent Line and Loadlow嘉泰姆
 Transient Responselow嘉泰姆
* Integrated internal compensationlow嘉泰姆
* Stable with Low ESR Ceramic Outputlow嘉泰姆
   Capacitorslow嘉泰姆
* Over Current Protection withlow嘉泰姆
    Hiccup-Modelow嘉泰姆
* Input over voltage protection(OVP)low嘉泰姆
*  Thermal Shutdownlow嘉泰姆
*  Inrush Current Limit and Soft Startlow嘉泰姆
*  Available in SOT23-6 Packagelow嘉泰姆
*  -40°C to +85°C Temperature Rangelow嘉泰姆
三,应用范围 (Applications)low嘉泰姆

Distributed Power Systemslow嘉泰姆
Digital Set Top Boxeslow嘉泰姆
Flat Panel Television and Monitorslow嘉泰姆
Wireless and DSL Modemslow嘉泰姆
Notebook Computerlow嘉泰姆
四.技术规格书下载（产品PDF）low嘉泰姆

需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！low嘉泰姆

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五,产品封装图 (Package)low嘉泰姆

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六.电路原理图low嘉泰姆
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七,功能概述low嘉泰姆

Internal Regulator low嘉泰姆
The JTM2234 is a current mode step down DC/DC converter that provides excellentlow嘉泰姆
transient response with no extra external compensation components. This device containslow嘉泰姆
an internal, low resistance, high voltage power MOSFET, and operates at a high 600Klow嘉泰姆
operating frequency to ensure a compact, high efficiency design with excellent AC and DClow嘉泰姆
performance.low嘉泰姆

Error Amplifierlow嘉泰姆
The error amplifier compares the FB pin voltage with the internal FB reference (VFB) andlow嘉泰姆
outputs a current proportional to the difference between the two. This output current is thenlow嘉泰姆
used to charge or discharge the internal compensation network to form the COMP voltage,low嘉泰姆
which is used to control the power MOSFET current. The optimized internal compensationlow嘉泰姆
network minimizes the external component counts and simplifies the control loop design. low嘉泰姆
Internal Soft-Startlow嘉泰姆
The soft-start is implemented to prevent the converter output voltage from overshootinglow嘉泰姆
during startup. When the chip starts, the internal circuitry generates a soft-start voltage (SS)low嘉泰姆
ramping up from 0V to 0.6V. When it is lower than the internal reference (REF), SSlow嘉泰姆
overrides REF so the error amplifier uses SS as the reference. When SS is higher thanlow嘉泰姆
REF, REF regains control. The SS time is internally fixed to 1 ms.low嘉泰姆
Over-Current-Protection and Hiccuplow嘉泰姆
The JTM2234 has cycle-by-cycle over current limit when the inductor current peak valuelow嘉泰姆
exceeds the set current limit threshold. Meanwhile, output voltage starts to drop until FB islow嘉泰姆
below the Under-Voltage (UV) threshold, typically 30% below the reference. Once a UV islow嘉泰姆
triggered, the JTM2234 enters hiccup mode to periodically restart the part. Thislow嘉泰姆
protection mode is especially useful when the output is dead-short to ground. The averagelow嘉泰姆
short circuit current is greatly reduced to alleviate the thermal issue and to protect thelow嘉泰姆
regulator. The JTM2234 exits the hiccup mode once the over current condition islow嘉泰姆
removed. low嘉泰姆
Startup and Shutdown low嘉泰姆
If both VIN and EN are higher than their appropriate thresholds, the chip starts. Thelow嘉泰姆
reference block starts first, generating stable reference voltage and currents, and then thelow嘉泰姆
internal regulator is enabled. The regulator provides stable supply for the remaininglow嘉泰姆
八,相关芯片选择指南               更多同类产品......low嘉泰姆

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