目录Ls0嘉泰姆

1.产品概述                       2.产品特点Ls0嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 Ls0嘉泰姆
5.产品封装图                     6.电路原理图                   Ls0嘉泰姆
7.功能概述                        8.相关产品Ls0嘉泰姆

一,产品概述(General Description)        Ls0嘉泰姆

      The CXSD61038 are high-efficiency, high frequency synchronous step-downLs0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 andLs0嘉泰姆
integrate main switch and synchronous switch with very low RDS(ON) to minimizeLs0嘉泰姆
the conduction loss.It is ideal for powering portable equipment that runs from aLs0嘉泰姆
single cell Lithium-Ion (Li+) battery. The output voltage can be regulated as low asLs0嘉泰姆
0.6V. The CXSD61038 can also run at 100% duty cycle for low dropout operation,Ls0嘉泰姆
extending battery life in portable system.This device offers two operation modes,Ls0嘉泰姆
PWM control and PFM Mode switchingcontrol, which allows a high efficiency overLs0嘉泰姆
the wider range of the load.Ls0嘉泰姆
      The CXSD61038 is offered in a low profile (1mm)5-pin, thin SOT package, andLs0嘉泰姆
is available in an adjustable version.Ls0嘉泰姆
二.产品特点(Features)Ls0嘉泰姆

1.)CXSD61038A 1.2A output currentLs0嘉泰姆
2.)CXSD61038B 1.5A output currentLs0嘉泰姆
3.)High Efficiency: Up to 96%Ls0嘉泰姆
4.)1.5MHz Constant Frequency OperationLs0嘉泰姆
5.)No Schottky Diode RequiredLs0嘉泰姆
6.)2.3V to 5.5V Input Voltage RangeLs0嘉泰姆
7.) Output Voltage as Low as 0.6VLs0嘉泰姆
8.)100% Duty Cycle in DropoutLs0嘉泰姆
9.) Low Quiescent Current: 35μALs0嘉泰姆
10.)Slope Compensated Current Mode Control for Excellent LineLs0嘉泰姆
      and Load Transient ResponseLs0嘉泰姆
11.)Short Circuit ProtectionLs0嘉泰姆
12.) Thermal Fault ProtectionLs0嘉泰姆
13.) Inrush Current Limit and Soft StartLs0嘉泰姆
14.)<1μA Shutdown CurrentLs0嘉泰姆
15.) Tiny SOT23-5 PackageLs0嘉泰姆
三,应用范围 (Applications)Ls0嘉泰姆

Cellular and Smart PhonesLs0嘉泰姆
Wireless and DSL ModemsLs0嘉泰姆
PDALs0嘉泰姆
Digital Still and Video CamerasLs0嘉泰姆
MP3 PlayersLs0嘉泰姆
四.下载产品资料PDF文档 Ls0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！Ls0嘉泰姆

 Ls0嘉泰姆

五,产品封装图 (Package)Ls0嘉泰姆
Ls0嘉泰姆

六.电路原理图Ls0嘉泰姆
Ls0嘉泰姆

七,功能概述Ls0嘉泰姆

FUNCTIONAL DESCRIPTIONLs0嘉泰姆

CXSD61038 is a synchronous buck regulator IC that integrates the PWM/PFM control, topLs0嘉泰姆
and bottom switches on the same die to minimize the switching transition loss andLs0嘉泰姆
conduction loss. With ultra low RDS(ON) power switches and proprietary PWM control,Ls0嘉泰姆
this regulator IC can achieve the highest efficiency and the highest switch frequencyLs0嘉泰姆
simultaneously to minimize the external inductor and capacitor size, and thusLs0嘉泰姆
achieving the minimum solution footprint.The CXSD61038 requires only three externalLs0嘉泰姆
power components (Cin, Cout and L). Theadjustable version can be programmedLs0嘉泰姆
with external feedback to any voltage,ranging from 0.6V to the input voltage.Ls0嘉泰姆
At dropout, the converter duty cycle increases to 100% and the output voltageLs0嘉泰姆
tracks the input voltage minus the Rdson drop of the high-side MOSFET.Ls0嘉泰姆
The internal error amplifier and compensation provides excellent transient response, load,Ls0嘉泰姆
and line regulation. Soft start function prevents input inrush current and outputLs0嘉泰姆
overshoot during start up.Ls0嘉泰姆
Inductor SelectionLs0嘉泰姆
For most designs, the CXSD61038 operates with inductors of 1μH to 4.7μH. Low inductanceLs0嘉泰姆
values are physically smaller but require faster switching, which results in some efficiency loss.Ls0嘉泰姆
The inductor value can be derived from the following equation:Ls0嘉泰姆
L =VIN × ∆I L × f OSC Ls0嘉泰姆
Where ∆I L is inductor Ripple Current. Large value inductors result in lower ripple current andLs0嘉泰姆
small value inductors result in high ripple current. For optimum voltage-positioning loadLs0嘉泰姆
transients, choose an inductor with DC series resistance in the 50mΩ to 150mΩ range.Ls0嘉泰姆
Input Capacitor SelectionLs0嘉泰姆
With the maximum load current at 1.5A, the maximum ripple current through input capacitorLs0嘉泰姆
is about 0.6Arms. A typical X7R or better grade ceramic capacitor with 6V rating and greaterLs0嘉泰姆
than 10uF capacitance can handle this ripple current well. To minimize the potential noiseLs0嘉泰姆
problem, place this ceramic capacitor really close to the IN andLs0嘉泰姆
GND pins. Care should be taken to minimizethe loop area formed by CIN, and IN/GND pins. Ls0嘉泰姆
Output Capacitor Selection Ls0嘉泰姆
The output capacitor is required to keep the output voltage ripple small and to ensureLs0嘉泰姆
regulation loop stability. The output capacitor must have low impedance at the switchingLs0嘉泰姆
frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their lowLs0嘉泰姆
ESR and high ripple current ratings. The outputripple VOUT is determined by:Ls0嘉泰姆
VOUT × (V IN − VOUT )         1  Ls0嘉泰姆
V IN × f OSC × L       8 × f osc × C3Ls0嘉泰姆
A 10μF ceramic can satisfy most applications.PC Board Layout Checklist When laying out the printedLs0嘉泰姆
circuit board, the following checking should be used to ensure proper operation of the CXSD61038. Check theLs0嘉泰姆
following in your layout:Ls0嘉泰姆
1. The power traces, consisting of the GND trace, the SW trace and the VIN traceshould be kept short,Ls0嘉泰姆
    direct and wide.Ls0嘉泰姆
2. Does the (+) plates of Cin connect to Vin as closely as possible? This capacitor provides the AC currentLs0嘉泰姆
    to the internal power MOSFETs.Ls0嘉泰姆
3. Keep the switching node, SW, away from the sensitive VOUT node.Ls0嘉泰姆
4. Keep the (-) plates of Cin and Cout as close as possibleLs0嘉泰姆
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