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目录jMM嘉泰姆

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

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

      The CXSD61038 are high-efficiency, high frequency synchronous step-downjMM嘉泰姆
DC-DC regulator ICs capable of delivering up to 1.5A output currents. TheCXSD61038 can operate over a wide input voltage range from 2.3V to 5.5V andjMM嘉泰姆
integrate main switch and synchronous switch with very low RDS(ON) to minimizejMM嘉泰姆
the conduction loss.It is ideal for powering portable equipment that runs from ajMM嘉泰姆
single cell Lithium-Ion (Li+) battery. The output voltage can be regulated as low asjMM嘉泰姆
0.6V. The CXSD61038 can also run at 100% duty cycle for low dropout operation,jMM嘉泰姆
extending battery life in portable system.This device offers two operation modes,jMM嘉泰姆
PWM control and PFM Mode switchingcontrol, which allows a high efficiency overjMM嘉泰姆
the wider range of the load.jMM嘉泰姆
      The CXSD61038 is offered in a low profile (1mm)5-pin, thin SOT package, andjMM嘉泰姆
is available in an adjustable version.jMM嘉泰姆
二.产品特点(Features)jMM嘉泰姆

1.)CXSD61038A 1.2A output currentjMM嘉泰姆
2.)CXSD61038B 1.5A output currentjMM嘉泰姆
3.)High Efficiency: Up to 96%jMM嘉泰姆
4.)1.5MHz Constant Frequency OperationjMM嘉泰姆
5.)No Schottky Diode RequiredjMM嘉泰姆
6.)2.3V to 5.5V Input Voltage RangejMM嘉泰姆
7.) Output Voltage as Low as 0.6VjMM嘉泰姆
8.)100% Duty Cycle in DropoutjMM嘉泰姆
9.) Low Quiescent Current: 35μAjMM嘉泰姆
10.)Slope Compensated Current Mode Control for Excellent LinejMM嘉泰姆
      and Load Transient ResponsejMM嘉泰姆
11.)Short Circuit ProtectionjMM嘉泰姆
12.) Thermal Fault ProtectionjMM嘉泰姆
13.) Inrush Current Limit and Soft StartjMM嘉泰姆
14.)<1μA Shutdown CurrentjMM嘉泰姆
15.) Tiny SOT23-5 PackagejMM嘉泰姆
三,应用范围 (Applications)jMM嘉泰姆

Cellular and Smart PhonesjMM嘉泰姆
Wireless and DSL ModemsjMM嘉泰姆
PDAjMM嘉泰姆
Digital Still and Video CamerasjMM嘉泰姆
MP3 PlayersjMM嘉泰姆
四.下载产品资料PDF文档 jMM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！jMM嘉泰姆

 jMM嘉泰姆

五,产品封装图 (Package)jMM嘉泰姆
jMM嘉泰姆

六.电路原理图jMM嘉泰姆
jMM嘉泰姆

七,功能概述jMM嘉泰姆

FUNCTIONAL DESCRIPTIONjMM嘉泰姆

CXSD61038 is a synchronous buck regulator IC that integrates the PWM/PFM control, topjMM嘉泰姆
and bottom switches on the same die to minimize the switching transition loss andjMM嘉泰姆
conduction loss. With ultra low RDS(ON) power switches and proprietary PWM control,jMM嘉泰姆
this regulator IC can achieve the highest efficiency and the highest switch frequencyjMM嘉泰姆
simultaneously to minimize the external inductor and capacitor size, and thusjMM嘉泰姆
achieving the minimum solution footprint.The CXSD61038 requires only three externaljMM嘉泰姆
power components (Cin, Cout and L). Theadjustable version can be programmedjMM嘉泰姆
with external feedback to any voltage,ranging from 0.6V to the input voltage.jMM嘉泰姆
At dropout, the converter duty cycle increases to 100% and the output voltagejMM嘉泰姆
tracks the input voltage minus the Rdson drop of the high-side MOSFET.jMM嘉泰姆
The internal error amplifier and compensation provides excellent transient response, load,jMM嘉泰姆
and line regulation. Soft start function prevents input inrush current and outputjMM嘉泰姆
overshoot during start up.jMM嘉泰姆
Inductor SelectionjMM嘉泰姆
For most designs, the CXSD61038 operates with inductors of 1μH to 4.7μH. Low inductancejMM嘉泰姆
values are physically smaller but require faster switching, which results in some efficiency loss.jMM嘉泰姆
The inductor value can be derived from the following equation:jMM嘉泰姆
L =VIN × ∆I L × f OSC jMM嘉泰姆
Where ∆I L is inductor Ripple Current. Large value inductors result in lower ripple current andjMM嘉泰姆
small value inductors result in high ripple current. For optimum voltage-positioning loadjMM嘉泰姆
transients, choose an inductor with DC series resistance in the 50mΩ to 150mΩ range.jMM嘉泰姆
Input Capacitor SelectionjMM嘉泰姆
With the maximum load current at 1.5A, the maximum ripple current through input capacitorjMM嘉泰姆
is about 0.6Arms. A typical X7R or better grade ceramic capacitor with 6V rating and greaterjMM嘉泰姆
than 10uF capacitance can handle this ripple current well. To minimize the potential noisejMM嘉泰姆
problem, place this ceramic capacitor really close to the IN andjMM嘉泰姆
GND pins. Care should be taken to minimizethe loop area formed by CIN, and IN/GND pins. jMM嘉泰姆
Output Capacitor Selection jMM嘉泰姆
The output capacitor is required to keep the output voltage ripple small and to ensurejMM嘉泰姆
regulation loop stability. The output capacitor must have low impedance at the switchingjMM嘉泰姆
frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their lowjMM嘉泰姆
ESR and high ripple current ratings. The outputripple VOUT is determined by:jMM嘉泰姆
VOUT × (V IN − VOUT )         1  jMM嘉泰姆
V IN × f OSC × L       8 × f osc × C3jMM嘉泰姆
A 10μF ceramic can satisfy most applications.PC Board Layout Checklist When laying out the printedjMM嘉泰姆
circuit board, the following checking should be used to ensure proper operation of the CXSD61038. Check thejMM嘉泰姆
following in your layout:jMM嘉泰姆
1. The power traces, consisting of the GND trace, the SW trace and the VIN traceshould be kept short,jMM嘉泰姆
    direct and wide.jMM嘉泰姆
2. Does the (+) plates of Cin connect to Vin as closely as possible? This capacitor provides the AC currentjMM嘉泰姆
    to the internal power MOSFETs.jMM嘉泰姆
3. Keep the switching node, SW, away from the sensitive VOUT node.jMM嘉泰姆
4. Keep the (-) plates of Cin and Cout as close as possiblejMM嘉泰姆
八,相关产品               更多同类产品......jMM嘉泰姆

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