目录w8s嘉泰姆

1.产品概述                       2.产品特点w8s嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 w8s嘉泰姆
5.产品封装图                     6.电路原理图                   w8s嘉泰姆
7.功能概述                        8.相关产品w8s嘉泰姆

一,产品概述(General Description)        w8s嘉泰姆

      The CXSD61038 are high-efficiency, high frequency synchronous step-downw8s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 andw8s嘉泰姆
integrate main switch and synchronous switch with very low RDS(ON) to minimizew8s嘉泰姆
the conduction loss.It is ideal for powering portable equipment that runs from aw8s嘉泰姆
single cell Lithium-Ion (Li+) battery. The output voltage can be regulated as low asw8s嘉泰姆
0.6V. The CXSD61038 can also run at 100% duty cycle for low dropout operation,w8s嘉泰姆
extending battery life in portable system.This device offers two operation modes,w8s嘉泰姆
PWM control and PFM Mode switchingcontrol, which allows a high efficiency overw8s嘉泰姆
the wider range of the load.w8s嘉泰姆
      The CXSD61038 is offered in a low profile (1mm)5-pin, thin SOT package, andw8s嘉泰姆
is available in an adjustable version.w8s嘉泰姆
二.产品特点(Features)w8s嘉泰姆

1.)CXSD61038A 1.2A output currentw8s嘉泰姆
2.)CXSD61038B 1.5A output currentw8s嘉泰姆
3.)High Efficiency: Up to 96%w8s嘉泰姆
4.)1.5MHz Constant Frequency Operationw8s嘉泰姆
5.)No Schottky Diode Requiredw8s嘉泰姆
6.)2.3V to 5.5V Input Voltage Rangew8s嘉泰姆
7.) Output Voltage as Low as 0.6Vw8s嘉泰姆
8.)100% Duty Cycle in Dropoutw8s嘉泰姆
9.) Low Quiescent Current: 35μAw8s嘉泰姆
10.)Slope Compensated Current Mode Control for Excellent Linew8s嘉泰姆
      and Load Transient Responsew8s嘉泰姆
11.)Short Circuit Protectionw8s嘉泰姆
12.) Thermal Fault Protectionw8s嘉泰姆
13.) Inrush Current Limit and Soft Startw8s嘉泰姆
14.)<1μA Shutdown Currentw8s嘉泰姆
15.) Tiny SOT23-5 Packagew8s嘉泰姆
三,应用范围 (Applications)w8s嘉泰姆

Cellular and Smart Phonesw8s嘉泰姆
Wireless and DSL Modemsw8s嘉泰姆
PDAw8s嘉泰姆
Digital Still and Video Camerasw8s嘉泰姆
MP3 Playersw8s嘉泰姆
四.下载产品资料PDF文档 w8s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！w8s嘉泰姆

 w8s嘉泰姆

五,产品封装图 (Package)w8s嘉泰姆
w8s嘉泰姆

六.电路原理图w8s嘉泰姆
w8s嘉泰姆

七,功能概述w8s嘉泰姆

FUNCTIONAL DESCRIPTIONw8s嘉泰姆

CXSD61038 is a synchronous buck regulator IC that integrates the PWM/PFM control, topw8s嘉泰姆
and bottom switches on the same die to minimize the switching transition loss andw8s嘉泰姆
conduction loss. With ultra low RDS(ON) power switches and proprietary PWM control,w8s嘉泰姆
this regulator IC can achieve the highest efficiency and the highest switch frequencyw8s嘉泰姆
simultaneously to minimize the external inductor and capacitor size, and thusw8s嘉泰姆
achieving the minimum solution footprint.The CXSD61038 requires only three externalw8s嘉泰姆
power components (Cin, Cout and L). Theadjustable version can be programmedw8s嘉泰姆
with external feedback to any voltage,ranging from 0.6V to the input voltage.w8s嘉泰姆
At dropout, the converter duty cycle increases to 100% and the output voltagew8s嘉泰姆
tracks the input voltage minus the Rdson drop of the high-side MOSFET.w8s嘉泰姆
The internal error amplifier and compensation provides excellent transient response, load,w8s嘉泰姆
and line regulation. Soft start function prevents input inrush current and outputw8s嘉泰姆
overshoot during start up.w8s嘉泰姆
Inductor Selectionw8s嘉泰姆
For most designs, the CXSD61038 operates with inductors of 1μH to 4.7μH. Low inductancew8s嘉泰姆
values are physically smaller but require faster switching, which results in some efficiency loss.w8s嘉泰姆
The inductor value can be derived from the following equation:w8s嘉泰姆
L =VIN × ∆I L × f OSC w8s嘉泰姆
Where ∆I L is inductor Ripple Current. Large value inductors result in lower ripple current andw8s嘉泰姆
small value inductors result in high ripple current. For optimum voltage-positioning loadw8s嘉泰姆
transients, choose an inductor with DC series resistance in the 50mΩ to 150mΩ range.w8s嘉泰姆
Input Capacitor Selectionw8s嘉泰姆
With the maximum load current at 1.5A, the maximum ripple current through input capacitorw8s嘉泰姆
is about 0.6Arms. A typical X7R or better grade ceramic capacitor with 6V rating and greaterw8s嘉泰姆
than 10uF capacitance can handle this ripple current well. To minimize the potential noisew8s嘉泰姆
problem, place this ceramic capacitor really close to the IN andw8s嘉泰姆
GND pins. Care should be taken to minimizethe loop area formed by CIN, and IN/GND pins. w8s嘉泰姆
Output Capacitor Selection w8s嘉泰姆
The output capacitor is required to keep the output voltage ripple small and to ensurew8s嘉泰姆
regulation loop stability. The output capacitor must have low impedance at the switchingw8s嘉泰姆
frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their loww8s嘉泰姆
ESR and high ripple current ratings. The outputripple VOUT is determined by:w8s嘉泰姆
VOUT × (V IN − VOUT )         1  w8s嘉泰姆
V IN × f OSC × L       8 × f osc × C3w8s嘉泰姆
A 10μF ceramic can satisfy most applications.PC Board Layout Checklist When laying out the printedw8s嘉泰姆
circuit board, the following checking should be used to ensure proper operation of the CXSD61038. Check thew8s嘉泰姆
following in your layout:w8s嘉泰姆
1. The power traces, consisting of the GND trace, the SW trace and the VIN traceshould be kept short,w8s嘉泰姆
    direct and wide.w8s嘉泰姆
2. Does the (+) plates of Cin connect to Vin as closely as possible? This capacitor provides the AC currentw8s嘉泰姆
    to the internal power MOSFETs.w8s嘉泰姆
3. Keep the switching node, SW, away from the sensitive VOUT node.w8s嘉泰姆
4. Keep the (-) plates of Cin and Cout as close as possiblew8s嘉泰姆
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