目录jOB嘉泰姆

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

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

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

1.)CXSD61038A 1.2A output currentjOB嘉泰姆
2.)CXSD61038B 1.5A output currentjOB嘉泰姆
3.)High Efficiency: Up to 96%jOB嘉泰姆
4.)1.5MHz Constant Frequency OperationjOB嘉泰姆
5.)No Schottky Diode RequiredjOB嘉泰姆
6.)2.3V to 5.5V Input Voltage RangejOB嘉泰姆
7.) Output Voltage as Low as 0.6VjOB嘉泰姆
8.)100% Duty Cycle in DropoutjOB嘉泰姆
9.) Low Quiescent Current: 35μAjOB嘉泰姆
10.)Slope Compensated Current Mode Control for Excellent LinejOB嘉泰姆
      and Load Transient ResponsejOB嘉泰姆
11.)Short Circuit ProtectionjOB嘉泰姆
12.) Thermal Fault ProtectionjOB嘉泰姆
13.) Inrush Current Limit and Soft StartjOB嘉泰姆
14.)<1μA Shutdown CurrentjOB嘉泰姆
15.) Tiny SOT23-5 PackagejOB嘉泰姆
三,应用范围 (Applications)jOB嘉泰姆

Cellular and Smart PhonesjOB嘉泰姆
Wireless and DSL ModemsjOB嘉泰姆
PDAjOB嘉泰姆
Digital Still and Video CamerasjOB嘉泰姆
MP3 PlayersjOB嘉泰姆
四.下载产品资料PDF文档 jOB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！jOB嘉泰姆

 jOB嘉泰姆

五,产品封装图 (Package)jOB嘉泰姆
jOB嘉泰姆

六.电路原理图jOB嘉泰姆
jOB嘉泰姆

七,功能概述jOB嘉泰姆

FUNCTIONAL DESCRIPTIONjOB嘉泰姆

CXSD61038 is a synchronous buck regulator IC that integrates the PWM/PFM control, topjOB嘉泰姆
and bottom switches on the same die to minimize the switching transition loss andjOB嘉泰姆
conduction loss. With ultra low RDS(ON) power switches and proprietary PWM control,jOB嘉泰姆
this regulator IC can achieve the highest efficiency and the highest switch frequencyjOB嘉泰姆
simultaneously to minimize the external inductor and capacitor size, and thusjOB嘉泰姆
achieving the minimum solution footprint.The CXSD61038 requires only three externaljOB嘉泰姆
power components (Cin, Cout and L). Theadjustable version can be programmedjOB嘉泰姆
with external feedback to any voltage,ranging from 0.6V to the input voltage.jOB嘉泰姆
At dropout, the converter duty cycle increases to 100% and the output voltagejOB嘉泰姆
tracks the input voltage minus the Rdson drop of the high-side MOSFET.jOB嘉泰姆
The internal error amplifier and compensation provides excellent transient response, load,jOB嘉泰姆
and line regulation. Soft start function prevents input inrush current and outputjOB嘉泰姆
overshoot during start up.jOB嘉泰姆
Inductor SelectionjOB嘉泰姆
For most designs, the CXSD61038 operates with inductors of 1μH to 4.7μH. Low inductancejOB嘉泰姆
values are physically smaller but require faster switching, which results in some efficiency loss.jOB嘉泰姆
The inductor value can be derived from the following equation:jOB嘉泰姆
L =VIN × ∆I L × f OSC jOB嘉泰姆
Where ∆I L is inductor Ripple Current. Large value inductors result in lower ripple current andjOB嘉泰姆
small value inductors result in high ripple current. For optimum voltage-positioning loadjOB嘉泰姆
transients, choose an inductor with DC series resistance in the 50mΩ to 150mΩ range.jOB嘉泰姆
Input Capacitor SelectionjOB嘉泰姆
With the maximum load current at 1.5A, the maximum ripple current through input capacitorjOB嘉泰姆
is about 0.6Arms. A typical X7R or better grade ceramic capacitor with 6V rating and greaterjOB嘉泰姆
than 10uF capacitance can handle this ripple current well. To minimize the potential noisejOB嘉泰姆
problem, place this ceramic capacitor really close to the IN andjOB嘉泰姆
GND pins. Care should be taken to minimizethe loop area formed by CIN, and IN/GND pins. jOB嘉泰姆
Output Capacitor Selection jOB嘉泰姆
The output capacitor is required to keep the output voltage ripple small and to ensurejOB嘉泰姆
regulation loop stability. The output capacitor must have low impedance at the switchingjOB嘉泰姆
frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their lowjOB嘉泰姆
ESR and high ripple current ratings. The outputripple VOUT is determined by:jOB嘉泰姆
VOUT × (V IN − VOUT )         1  jOB嘉泰姆
V IN × f OSC × L       8 × f osc × C3jOB嘉泰姆
A 10μF ceramic can satisfy most applications.PC Board Layout Checklist When laying out the printedjOB嘉泰姆
circuit board, the following checking should be used to ensure proper operation of the CXSD61038. Check thejOB嘉泰姆
following in your layout:jOB嘉泰姆
1. The power traces, consisting of the GND trace, the SW trace and the VIN traceshould be kept short,jOB嘉泰姆
    direct and wide.jOB嘉泰姆
2. Does the (+) plates of Cin connect to Vin as closely as possible? This capacitor provides the AC currentjOB嘉泰姆
    to the internal power MOSFETs.jOB嘉泰姆
3. Keep the switching node, SW, away from the sensitive VOUT node.jOB嘉泰姆
4. Keep the (-) plates of Cin and Cout as close as possiblejOB嘉泰姆
八,相关产品               更多同类产品......jOB嘉泰姆