目录zWH嘉泰姆

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

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

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

1.)CXSD61038A 1.2A output currentzWH嘉泰姆
2.)CXSD61038B 1.5A output currentzWH嘉泰姆
3.)High Efficiency: Up to 96%zWH嘉泰姆
4.)1.5MHz Constant Frequency OperationzWH嘉泰姆
5.)No Schottky Diode RequiredzWH嘉泰姆
6.)2.3V to 5.5V Input Voltage RangezWH嘉泰姆
7.) Output Voltage as Low as 0.6VzWH嘉泰姆
8.)100% Duty Cycle in DropoutzWH嘉泰姆
9.) Low Quiescent Current: 35μAzWH嘉泰姆
10.)Slope Compensated Current Mode Control for Excellent LinezWH嘉泰姆
      and Load Transient ResponsezWH嘉泰姆
11.)Short Circuit ProtectionzWH嘉泰姆
12.) Thermal Fault ProtectionzWH嘉泰姆
13.) Inrush Current Limit and Soft StartzWH嘉泰姆
14.)<1μA Shutdown CurrentzWH嘉泰姆
15.) Tiny SOT23-5 PackagezWH嘉泰姆
三,应用范围 (Applications)zWH嘉泰姆

Cellular and Smart PhoneszWH嘉泰姆
Wireless and DSL ModemszWH嘉泰姆
PDAzWH嘉泰姆
Digital Still and Video CameraszWH嘉泰姆
MP3 PlayerszWH嘉泰姆
四.下载产品资料PDF文档 zWH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！zWH嘉泰姆

 zWH嘉泰姆

五,产品封装图 (Package)zWH嘉泰姆
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六.电路原理图zWH嘉泰姆
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七,功能概述zWH嘉泰姆

FUNCTIONAL DESCRIPTIONzWH嘉泰姆

CXSD61038 is a synchronous buck regulator IC that integrates the PWM/PFM control, topzWH嘉泰姆
and bottom switches on the same die to minimize the switching transition loss andzWH嘉泰姆
conduction loss. With ultra low RDS(ON) power switches and proprietary PWM control,zWH嘉泰姆
this regulator IC can achieve the highest efficiency and the highest switch frequencyzWH嘉泰姆
simultaneously to minimize the external inductor and capacitor size, and thuszWH嘉泰姆
achieving the minimum solution footprint.The CXSD61038 requires only three externalzWH嘉泰姆
power components (Cin, Cout and L). Theadjustable version can be programmedzWH嘉泰姆
with external feedback to any voltage,ranging from 0.6V to the input voltage.zWH嘉泰姆
At dropout, the converter duty cycle increases to 100% and the output voltagezWH嘉泰姆
tracks the input voltage minus the Rdson drop of the high-side MOSFET.zWH嘉泰姆
The internal error amplifier and compensation provides excellent transient response, load,zWH嘉泰姆
and line regulation. Soft start function prevents input inrush current and outputzWH嘉泰姆
overshoot during start up.zWH嘉泰姆
Inductor SelectionzWH嘉泰姆
For most designs, the CXSD61038 operates with inductors of 1μH to 4.7μH. Low inductancezWH嘉泰姆
values are physically smaller but require faster switching, which results in some efficiency loss.zWH嘉泰姆
The inductor value can be derived from the following equation:zWH嘉泰姆
L =VIN × ∆I L × f OSC zWH嘉泰姆
Where ∆I L is inductor Ripple Current. Large value inductors result in lower ripple current andzWH嘉泰姆
small value inductors result in high ripple current. For optimum voltage-positioning loadzWH嘉泰姆
transients, choose an inductor with DC series resistance in the 50mΩ to 150mΩ range.zWH嘉泰姆
Input Capacitor SelectionzWH嘉泰姆
With the maximum load current at 1.5A, the maximum ripple current through input capacitorzWH嘉泰姆
is about 0.6Arms. A typical X7R or better grade ceramic capacitor with 6V rating and greaterzWH嘉泰姆
than 10uF capacitance can handle this ripple current well. To minimize the potential noisezWH嘉泰姆
problem, place this ceramic capacitor really close to the IN andzWH嘉泰姆
GND pins. Care should be taken to minimizethe loop area formed by CIN, and IN/GND pins. zWH嘉泰姆
Output Capacitor Selection zWH嘉泰姆
The output capacitor is required to keep the output voltage ripple small and to ensurezWH嘉泰姆
regulation loop stability. The output capacitor must have low impedance at the switchingzWH嘉泰姆
frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their lowzWH嘉泰姆
ESR and high ripple current ratings. The outputripple VOUT is determined by:zWH嘉泰姆
VOUT × (V IN − VOUT )         1  zWH嘉泰姆
V IN × f OSC × L       8 × f osc × C3zWH嘉泰姆
A 10μF ceramic can satisfy most applications.PC Board Layout Checklist When laying out the printedzWH嘉泰姆
circuit board, the following checking should be used to ensure proper operation of the CXSD61038. Check thezWH嘉泰姆
following in your layout:zWH嘉泰姆
1. The power traces, consisting of the GND trace, the SW trace and the VIN traceshould be kept short,zWH嘉泰姆
    direct and wide.zWH嘉泰姆
2. Does the (+) plates of Cin connect to Vin as closely as possible? This capacitor provides the AC currentzWH嘉泰姆
    to the internal power MOSFETs.zWH嘉泰姆
3. Keep the switching node, SW, away from the sensitive VOUT node.zWH嘉泰姆
4. Keep the (-) plates of Cin and Cout as close as possiblezWH嘉泰姆
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