目录aL9嘉泰姆

1.产品概述                       2.产品特点aL9嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 aL9嘉泰姆
5.产品封装图                     6.电路原理图                   aL9嘉泰姆
7.功能概述                        8.相关产品aL9嘉泰姆

一,产品概述(General Description)        aL9嘉泰姆

      The CXSD61038 are high-efficiency, high frequency synchronous step-downaL9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 andaL9嘉泰姆
integrate main switch and synchronous switch with very low RDS(ON) to minimizeaL9嘉泰姆
the conduction loss.It is ideal for powering portable equipment that runs from aaL9嘉泰姆
single cell Lithium-Ion (Li+) battery. The output voltage can be regulated as low asaL9嘉泰姆
0.6V. The CXSD61038 can also run at 100% duty cycle for low dropout operation,aL9嘉泰姆
extending battery life in portable system.This device offers two operation modes,aL9嘉泰姆
PWM control and PFM Mode switchingcontrol, which allows a high efficiency overaL9嘉泰姆
the wider range of the load.aL9嘉泰姆
      The CXSD61038 is offered in a low profile (1mm)5-pin, thin SOT package, andaL9嘉泰姆
is available in an adjustable version.aL9嘉泰姆
二.产品特点(Features)aL9嘉泰姆

1.)CXSD61038A 1.2A output currentaL9嘉泰姆
2.)CXSD61038B 1.5A output currentaL9嘉泰姆
3.)High Efficiency: Up to 96%aL9嘉泰姆
4.)1.5MHz Constant Frequency OperationaL9嘉泰姆
5.)No Schottky Diode RequiredaL9嘉泰姆
6.)2.3V to 5.5V Input Voltage RangeaL9嘉泰姆
7.) Output Voltage as Low as 0.6VaL9嘉泰姆
8.)100% Duty Cycle in DropoutaL9嘉泰姆
9.) Low Quiescent Current: 35μAaL9嘉泰姆
10.)Slope Compensated Current Mode Control for Excellent LineaL9嘉泰姆
      and Load Transient ResponseaL9嘉泰姆
11.)Short Circuit ProtectionaL9嘉泰姆
12.) Thermal Fault ProtectionaL9嘉泰姆
13.) Inrush Current Limit and Soft StartaL9嘉泰姆
14.)<1μA Shutdown CurrentaL9嘉泰姆
15.) Tiny SOT23-5 PackageaL9嘉泰姆
三,应用范围 (Applications)aL9嘉泰姆

Cellular and Smart PhonesaL9嘉泰姆
Wireless and DSL ModemsaL9嘉泰姆
PDAaL9嘉泰姆
Digital Still and Video CamerasaL9嘉泰姆
MP3 PlayersaL9嘉泰姆
四.下载产品资料PDF文档 aL9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！aL9嘉泰姆

 aL9嘉泰姆

五,产品封装图 (Package)aL9嘉泰姆
aL9嘉泰姆

六.电路原理图aL9嘉泰姆
aL9嘉泰姆

七,功能概述aL9嘉泰姆

FUNCTIONAL DESCRIPTIONaL9嘉泰姆

CXSD61038 is a synchronous buck regulator IC that integrates the PWM/PFM control, topaL9嘉泰姆
and bottom switches on the same die to minimize the switching transition loss andaL9嘉泰姆
conduction loss. With ultra low RDS(ON) power switches and proprietary PWM control,aL9嘉泰姆
this regulator IC can achieve the highest efficiency and the highest switch frequencyaL9嘉泰姆
simultaneously to minimize the external inductor and capacitor size, and thusaL9嘉泰姆
achieving the minimum solution footprint.The CXSD61038 requires only three externalaL9嘉泰姆
power components (Cin, Cout and L). Theadjustable version can be programmedaL9嘉泰姆
with external feedback to any voltage,ranging from 0.6V to the input voltage.aL9嘉泰姆
At dropout, the converter duty cycle increases to 100% and the output voltageaL9嘉泰姆
tracks the input voltage minus the Rdson drop of the high-side MOSFET.aL9嘉泰姆
The internal error amplifier and compensation provides excellent transient response, load,aL9嘉泰姆
and line regulation. Soft start function prevents input inrush current and outputaL9嘉泰姆
overshoot during start up.aL9嘉泰姆
Inductor SelectionaL9嘉泰姆
For most designs, the CXSD61038 operates with inductors of 1μH to 4.7μH. Low inductanceaL9嘉泰姆
values are physically smaller but require faster switching, which results in some efficiency loss.aL9嘉泰姆
The inductor value can be derived from the following equation:aL9嘉泰姆
L =VIN × ∆I L × f OSC aL9嘉泰姆
Where ∆I L is inductor Ripple Current. Large value inductors result in lower ripple current andaL9嘉泰姆
small value inductors result in high ripple current. For optimum voltage-positioning loadaL9嘉泰姆
transients, choose an inductor with DC series resistance in the 50mΩ to 150mΩ range.aL9嘉泰姆
Input Capacitor SelectionaL9嘉泰姆
With the maximum load current at 1.5A, the maximum ripple current through input capacitoraL9嘉泰姆
is about 0.6Arms. A typical X7R or better grade ceramic capacitor with 6V rating and greateraL9嘉泰姆
than 10uF capacitance can handle this ripple current well. To minimize the potential noiseaL9嘉泰姆
problem, place this ceramic capacitor really close to the IN andaL9嘉泰姆
GND pins. Care should be taken to minimizethe loop area formed by CIN, and IN/GND pins. aL9嘉泰姆
Output Capacitor Selection aL9嘉泰姆
The output capacitor is required to keep the output voltage ripple small and to ensureaL9嘉泰姆
regulation loop stability. The output capacitor must have low impedance at the switchingaL9嘉泰姆
frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their lowaL9嘉泰姆
ESR and high ripple current ratings. The outputripple VOUT is determined by:aL9嘉泰姆
VOUT × (V IN − VOUT )         1  aL9嘉泰姆
V IN × f OSC × L       8 × f osc × C3aL9嘉泰姆
A 10μF ceramic can satisfy most applications.PC Board Layout Checklist When laying out the printedaL9嘉泰姆
circuit board, the following checking should be used to ensure proper operation of the CXSD61038. Check theaL9嘉泰姆
following in your layout:aL9嘉泰姆
1. The power traces, consisting of the GND trace, the SW trace and the VIN traceshould be kept short,aL9嘉泰姆
    direct and wide.aL9嘉泰姆
2. Does the (+) plates of Cin connect to Vin as closely as possible? This capacitor provides the AC currentaL9嘉泰姆
    to the internal power MOSFETs.aL9嘉泰姆
3. Keep the switching node, SW, away from the sensitive VOUT node.aL9嘉泰姆
4. Keep the (-) plates of Cin and Cout as close as possibleaL9嘉泰姆
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