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目录g9e嘉泰姆

1.产品概述                       2.产品特点g9e嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 g9e嘉泰姆
5.产品封装图                     6.电路原理图                   g9e嘉泰姆
7.功能概述                        8.相关产品g9e嘉泰姆

一,产品概述(General Description)        g9e嘉泰姆

      The CXSD61038 are high-efficiency, high frequency synchronous step-downg9e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 andg9e嘉泰姆
integrate main switch and synchronous switch with very low RDS(ON) to minimizeg9e嘉泰姆
the conduction loss.It is ideal for powering portable equipment that runs from ag9e嘉泰姆
single cell Lithium-Ion (Li+) battery. The output voltage can be regulated as low asg9e嘉泰姆
0.6V. The CXSD61038 can also run at 100% duty cycle for low dropout operation,g9e嘉泰姆
extending battery life in portable system.This device offers two operation modes,g9e嘉泰姆
PWM control and PFM Mode switchingcontrol, which allows a high efficiency overg9e嘉泰姆
the wider range of the load.g9e嘉泰姆
      The CXSD61038 is offered in a low profile (1mm)5-pin, thin SOT package, andg9e嘉泰姆
is available in an adjustable version.g9e嘉泰姆
二.产品特点(Features)g9e嘉泰姆

1.)CXSD61038A 1.2A output currentg9e嘉泰姆
2.)CXSD61038B 1.5A output currentg9e嘉泰姆
3.)High Efficiency: Up to 96%g9e嘉泰姆
4.)1.5MHz Constant Frequency Operationg9e嘉泰姆
5.)No Schottky Diode Requiredg9e嘉泰姆
6.)2.3V to 5.5V Input Voltage Rangeg9e嘉泰姆
7.) Output Voltage as Low as 0.6Vg9e嘉泰姆
8.)100% Duty Cycle in Dropoutg9e嘉泰姆
9.) Low Quiescent Current: 35μAg9e嘉泰姆
10.)Slope Compensated Current Mode Control for Excellent Lineg9e嘉泰姆
      and Load Transient Responseg9e嘉泰姆
11.)Short Circuit Protectiong9e嘉泰姆
12.) Thermal Fault Protectiong9e嘉泰姆
13.) Inrush Current Limit and Soft Startg9e嘉泰姆
14.)<1μA Shutdown Currentg9e嘉泰姆
15.) Tiny SOT23-5 Packageg9e嘉泰姆
三,应用范围 (Applications)g9e嘉泰姆

Cellular and Smart Phonesg9e嘉泰姆
Wireless and DSL Modemsg9e嘉泰姆
PDAg9e嘉泰姆
Digital Still and Video Camerasg9e嘉泰姆
MP3 Playersg9e嘉泰姆
四.下载产品资料PDF文档 g9e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！g9e嘉泰姆

 g9e嘉泰姆

五,产品封装图 (Package)g9e嘉泰姆
g9e嘉泰姆

六.电路原理图g9e嘉泰姆
g9e嘉泰姆

七,功能概述g9e嘉泰姆

FUNCTIONAL DESCRIPTIONg9e嘉泰姆

CXSD61038 is a synchronous buck regulator IC that integrates the PWM/PFM control, topg9e嘉泰姆
and bottom switches on the same die to minimize the switching transition loss andg9e嘉泰姆
conduction loss. With ultra low RDS(ON) power switches and proprietary PWM control,g9e嘉泰姆
this regulator IC can achieve the highest efficiency and the highest switch frequencyg9e嘉泰姆
simultaneously to minimize the external inductor and capacitor size, and thusg9e嘉泰姆
achieving the minimum solution footprint.The CXSD61038 requires only three externalg9e嘉泰姆
power components (Cin, Cout and L). Theadjustable version can be programmedg9e嘉泰姆
with external feedback to any voltage,ranging from 0.6V to the input voltage.g9e嘉泰姆
At dropout, the converter duty cycle increases to 100% and the output voltageg9e嘉泰姆
tracks the input voltage minus the Rdson drop of the high-side MOSFET.g9e嘉泰姆
The internal error amplifier and compensation provides excellent transient response, load,g9e嘉泰姆
and line regulation. Soft start function prevents input inrush current and outputg9e嘉泰姆
overshoot during start up.g9e嘉泰姆
Inductor Selectiong9e嘉泰姆
For most designs, the CXSD61038 operates with inductors of 1μH to 4.7μH. Low inductanceg9e嘉泰姆
values are physically smaller but require faster switching, which results in some efficiency loss.g9e嘉泰姆
The inductor value can be derived from the following equation:g9e嘉泰姆
L =VIN × ∆I L × f OSC g9e嘉泰姆
Where ∆I L is inductor Ripple Current. Large value inductors result in lower ripple current andg9e嘉泰姆
small value inductors result in high ripple current. For optimum voltage-positioning loadg9e嘉泰姆
transients, choose an inductor with DC series resistance in the 50mΩ to 150mΩ range.g9e嘉泰姆
Input Capacitor Selectiong9e嘉泰姆
With the maximum load current at 1.5A, the maximum ripple current through input capacitorg9e嘉泰姆
is about 0.6Arms. A typical X7R or better grade ceramic capacitor with 6V rating and greaterg9e嘉泰姆
than 10uF capacitance can handle this ripple current well. To minimize the potential noiseg9e嘉泰姆
problem, place this ceramic capacitor really close to the IN andg9e嘉泰姆
GND pins. Care should be taken to minimizethe loop area formed by CIN, and IN/GND pins. g9e嘉泰姆
Output Capacitor Selection g9e嘉泰姆
The output capacitor is required to keep the output voltage ripple small and to ensureg9e嘉泰姆
regulation loop stability. The output capacitor must have low impedance at the switchingg9e嘉泰姆
frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their lowg9e嘉泰姆
ESR and high ripple current ratings. The outputripple VOUT is determined by:g9e嘉泰姆
VOUT × (V IN − VOUT )         1  g9e嘉泰姆
V IN × f OSC × L       8 × f osc × C3g9e嘉泰姆
A 10μF ceramic can satisfy most applications.PC Board Layout Checklist When laying out the printedg9e嘉泰姆
circuit board, the following checking should be used to ensure proper operation of the CXSD61038. Check theg9e嘉泰姆
following in your layout:g9e嘉泰姆
1. The power traces, consisting of the GND trace, the SW trace and the VIN traceshould be kept short,g9e嘉泰姆
    direct and wide.g9e嘉泰姆
2. Does the (+) plates of Cin connect to Vin as closely as possible? This capacitor provides the AC currentg9e嘉泰姆
    to the internal power MOSFETs.g9e嘉泰姆
3. Keep the switching node, SW, away from the sensitive VOUT node.g9e嘉泰姆
4. Keep the (-) plates of Cin and Cout as close as possibleg9e嘉泰姆
八,相关产品               更多同类产品......g9e嘉泰姆

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