CXSD61038 high-efficiency high frequency synchronous step-down DC-DC regulator ICs capable of delive

目录ckX嘉泰姆

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

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

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

1.)CXSD61038A 1.2A output currentckX嘉泰姆
2.)CXSD61038B 1.5A output currentckX嘉泰姆
3.)High Efficiency: Up to 96%ckX嘉泰姆
4.)1.5MHz Constant Frequency OperationckX嘉泰姆
5.)No Schottky Diode RequiredckX嘉泰姆
6.)2.3V to 5.5V Input Voltage RangeckX嘉泰姆
7.) Output Voltage as Low as 0.6VckX嘉泰姆
8.)100% Duty Cycle in DropoutckX嘉泰姆
9.) Low Quiescent Current: 35μAckX嘉泰姆
10.)Slope Compensated Current Mode Control for Excellent LineckX嘉泰姆
      and Load Transient ResponseckX嘉泰姆
11.)Short Circuit ProtectionckX嘉泰姆
12.) Thermal Fault ProtectionckX嘉泰姆
13.) Inrush Current Limit and Soft StartckX嘉泰姆
14.)<1μA Shutdown CurrentckX嘉泰姆
15.) Tiny SOT23-5 PackageckX嘉泰姆
三,应用范围 (Applications)ckX嘉泰姆

Cellular and Smart PhonesckX嘉泰姆
Wireless and DSL ModemsckX嘉泰姆
PDAckX嘉泰姆
Digital Still and Video CamerasckX嘉泰姆
MP3 PlayersckX嘉泰姆
四.下载产品资料PDF文档 ckX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！ckX嘉泰姆

 ckX嘉泰姆

五,产品封装图 (Package)ckX嘉泰姆
ckX嘉泰姆

六.电路原理图ckX嘉泰姆
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七,功能概述ckX嘉泰姆

FUNCTIONAL DESCRIPTIONckX嘉泰姆

CXSD61038 is a synchronous buck regulator IC that integrates the PWM/PFM control, topckX嘉泰姆
and bottom switches on the same die to minimize the switching transition loss andckX嘉泰姆
conduction loss. With ultra low RDS(ON) power switches and proprietary PWM control,ckX嘉泰姆
this regulator IC can achieve the highest efficiency and the highest switch frequencyckX嘉泰姆
simultaneously to minimize the external inductor and capacitor size, and thusckX嘉泰姆
achieving the minimum solution footprint.The CXSD61038 requires only three externalckX嘉泰姆
power components (Cin, Cout and L). Theadjustable version can be programmedckX嘉泰姆
with external feedback to any voltage,ranging from 0.6V to the input voltage.ckX嘉泰姆
At dropout, the converter duty cycle increases to 100% and the output voltageckX嘉泰姆
tracks the input voltage minus the Rdson drop of the high-side MOSFET.ckX嘉泰姆
The internal error amplifier and compensation provides excellent transient response, load,ckX嘉泰姆
and line regulation. Soft start function prevents input inrush current and outputckX嘉泰姆
overshoot during start up.ckX嘉泰姆
Inductor SelectionckX嘉泰姆
For most designs, the CXSD61038 operates with inductors of 1μH to 4.7μH. Low inductanceckX嘉泰姆
values are physically smaller but require faster switching, which results in some efficiency loss.ckX嘉泰姆
The inductor value can be derived from the following equation:ckX嘉泰姆
L =VIN × ∆I L × f OSC ckX嘉泰姆
Where ∆I L is inductor Ripple Current. Large value inductors result in lower ripple current andckX嘉泰姆
small value inductors result in high ripple current. For optimum voltage-positioning loadckX嘉泰姆
transients, choose an inductor with DC series resistance in the 50mΩ to 150mΩ range.ckX嘉泰姆
Input Capacitor SelectionckX嘉泰姆
With the maximum load current at 1.5A, the maximum ripple current through input capacitorckX嘉泰姆
is about 0.6Arms. A typical X7R or better grade ceramic capacitor with 6V rating and greaterckX嘉泰姆
than 10uF capacitance can handle this ripple current well. To minimize the potential noiseckX嘉泰姆
problem, place this ceramic capacitor really close to the IN andckX嘉泰姆
GND pins. Care should be taken to minimizethe loop area formed by CIN, and IN/GND pins. ckX嘉泰姆
Output Capacitor Selection ckX嘉泰姆
The output capacitor is required to keep the output voltage ripple small and to ensureckX嘉泰姆
regulation loop stability. The output capacitor must have low impedance at the switchingckX嘉泰姆
frequency. Ceramic capacitors with X5R or X7R dielectrics are recommended due to their lowckX嘉泰姆
ESR and high ripple current ratings. The outputripple VOUT is determined by:ckX嘉泰姆
VOUT × (V IN − VOUT )         1  ckX嘉泰姆
V IN × f OSC × L       8 × f osc × C3ckX嘉泰姆
A 10μF ceramic can satisfy most applications.PC Board Layout Checklist When laying out the printedckX嘉泰姆
circuit board, the following checking should be used to ensure proper operation of the CXSD61038. Check theckX嘉泰姆
following in your layout:ckX嘉泰姆
1. The power traces, consisting of the GND trace, the SW trace and the VIN traceshould be kept short,ckX嘉泰姆
    direct and wide.ckX嘉泰姆
2. Does the (+) plates of Cin connect to Vin as closely as possible? This capacitor provides the AC currentckX嘉泰姆
    to the internal power MOSFETs.ckX嘉泰姆
3. Keep the switching node, SW, away from the sensitive VOUT node.ckX嘉泰姆
4. Keep the (-) plates of Cin and Cout as close as possibleckX嘉泰姆
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