固定300kHz开关率频CXSD6273同步buck-PWM线性控制器0.8V参考输出电压以及监控和保护功能于一体。固定300kHz开关

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发表时间：2020-04-21浏览次数：215

固定300kHz开关率频CXSD6273同步buck-PWM线性控制器0.8V参考输出电压以及监控和保护功能于一体。固定300kHz开关

目录giq嘉泰姆

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

一,产品概述(General Description) giq嘉泰姆

The CXSD6273 integrates synchronous buck PWM, linear controller, and 0.8V Referencegiq嘉泰姆
Out Voltage, as well as the monitoring and protection functions into a single package. The giq嘉泰姆
fixed 300kHz switching frequency synchro-nous PWM controller drives dual N-channelgiq嘉泰姆
MOSFETs,which provides one controlled power output with over-voltage and over-currentgiq嘉泰姆
protections. Linear controller drives an external N-channel MOSFET with under-volt-giq嘉泰姆
age protection.giq嘉泰姆
The CXSD6273 provides excellent regulation for output load variation. An internal 0.8Vgiq嘉泰姆
temperature-compensated ref-erence voltage is designed to meet the requirement ofgiq嘉泰姆
low output voltage applications.giq嘉泰姆
The CXSD6273 with excellent protection functions: POR,OCP, OVP and UVP. Thegiq嘉泰姆
Power-On-Reset (POR) circuit can monitor VCC12 supply voltage exceeds its thresholdgiq嘉泰姆
voltage while the controller is running, and a built-in digi-tal soft-start provides both outputsgiq嘉泰姆
with controlled rising voltage. The Over-Current Protection (OCP) monitors the output currentgiq嘉泰姆
by using the voltage drop across the lower MOSFET’s RDS(ON), comparing with the voltagegiq嘉泰姆
of OCSET pin, VOCSET. The maximum VOCSET voltage is limited to the internal default valuegiq嘉泰姆
0.25V. In addition, when OCSET pin is floating (no ROCSET resistor), the over current thresholdgiq嘉泰姆
will also be internal default value, 0.25V. When the output current reaches the trip point, thegiq嘉泰姆
controller will shutdown the IC directly, and latch the converter’s output. The Un-der-Voltage Protection (UVP) monitors the voltage of FBL pin for short-circuit protection. When the VFBL is less thangiq嘉泰姆
50% of VREF, the controller will shutdown the IC directly.The Over-Voltage Protection (OVP)giq嘉泰姆
monitors the voltage of FB. When the VFB is over 135% of VREF, the controller willgiq嘉泰姆
make Low-side gate signal fully turn on until the fault events are removed.giq嘉泰姆
二.产品特点(Features)giq嘉泰姆

1.)Two Regulated Voltages and REF_OUT Synchronous Buck Convertergiq嘉泰姆
Linear Regulatorgiq嘉泰姆
REF_OUT = 0.8V±1% with 3mA Source Currentgiq嘉泰姆
2.)Single 12V Power Supply Requiredgiq嘉泰姆
3.)Excellent Both Output Voltage Regulationgiq嘉泰姆
0.8V Internal Referencegiq嘉泰姆
±1% Over Line Voltage and Temperaturegiq嘉泰姆
4.)Integrated Soft-Start for PWM and Linear Outputsgiq嘉泰姆
5.)300KHz Fixed Switching Frequencygiq嘉泰姆
6.)Voltage Mode PWM Control Design and Up to 89%(Typ.) Duty Cyclegiq嘉泰姆
7.)Under-Voltage Protection Monitoring Linear Out-putgiq嘉泰姆
8.)Over-Voltage Protection Monitoring PWM Outputgiq嘉泰姆
9.)Over-Current Protection for PWM Output Sense Low-side MOSFET’s RDS(ON)giq嘉泰姆

10.)SOP-14, SSOP-16 and Compact QFN4x4-16 pack-agesgiq嘉泰姆
11.)Lead Free and Green Devices Available(RoHS Compliant)giq嘉泰姆
三,应用范围 (Applications)giq嘉泰姆

Graphic Cardsgiq嘉泰姆
四.下载产品资料PDF文档 giq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！giq嘉泰姆

QQ截图20160419174301.jpg giq嘉泰姆

五,产品封装图 (Package)giq嘉泰姆
giq嘉泰姆
FUNCTION NAMEFUNCTIONgiq嘉泰姆

PIN NO.giq嘉泰姆			NAMEgiq嘉泰姆	FUNCTIONgiq嘉泰姆


SOP-14giq嘉泰姆	SSOP-16giq嘉泰姆	QFN4x4-16giq嘉泰姆
1giq嘉泰姆	15giq嘉泰姆		BOOTgiq嘉泰姆	This pin provides the bootstrap voltage to the upper gate driver for driving the N-channel MOSFET. An external capacitor from PHASE to BOOT, an internaldiode, and the power supply voltage VCC12, generates the bootstrap voltagegiq嘉泰姆 for the upper gate diver (UGATE).giq嘉泰姆
2giq嘉泰姆	2giq嘉泰姆	16giq嘉泰姆	FS_DISgiq嘉泰姆	This pin provides shutdown function. When pulling low the FS_DIS pin near GND will shutdown both regulators; almost any NFET or other pull-down device (< 1k. impedance) should work. Upon release of the FS_DIS pin, it willgiq嘉泰姆 enable both outputs back into regulation.giq嘉泰姆
3giq嘉泰姆	3giq嘉泰姆	1giq嘉泰姆	COMPgiq嘉泰姆	This pin is the output of PWM error amplifier. It is used to set the compensation components.giq嘉泰姆
4giq嘉泰姆	4giq嘉泰姆	2giq嘉泰姆	FBgiq嘉泰姆	This pin is the inverting input of the PWM error amplifier. It is used to set the output voltage and the compensation components. This pin is also monitoredgiq嘉泰姆 for under-voltage protection, when the FB voltage is under 50% of referencegiq嘉泰姆 voltage (0.4V), both outputs will be shutdowned immediately.giq嘉泰姆
5giq嘉泰姆	5giq嘉泰姆	3giq嘉泰姆	DRIVEgiq嘉泰姆	This pin drives the gate of an external N-channel MOSFET for linear regulator.giq嘉泰姆 It is also used to set the compensation for some specific applications, forgiq嘉泰姆 example, with low values of output capacitance and ESR.giq嘉泰姆
6giq嘉泰姆	6giq嘉泰姆	4giq嘉泰姆	FBLgiq嘉泰姆	This pin is the inverting input of the linear regulator error amplifier. It is used togiq嘉泰姆 set the output voltage. This pin is also monitored for under-voltage protection,when the FBL voltage is under 50% of reference voltage(0.4V), both outputs will be shutdown immediately.giq嘉泰姆
7giq嘉泰姆	7,8giq嘉泰姆	5,6giq嘉泰姆	GNDgiq嘉泰姆	This pin is the signal ground pin. Connect the GND pin to a good ground plane.giq嘉泰姆
8giq嘉泰姆	9,10giq嘉泰姆	7,8giq嘉泰姆	VCC12giq嘉泰姆	Power supply input pin. Connect a nominal 12V power supply to this pin. Thepower- on reset function monitors the input voltage at this pin. It is recommended that a decoupling capacitor (1 to 10μF) be connected to GND for noise decoupling.giq嘉泰姆
9giq嘉泰姆	11giq嘉泰姆	9giq嘉泰姆	REF_OUTgiq嘉泰姆	This pin provides a buffed voltage, which is from internal reference voltage. It is recommended that a 1mF capacitor is connected to ground for stability.giq嘉泰姆 When VOCSET is above 1V, the REF_OUT buffer will be closed, the VREF_OUT is 0V.giq嘉泰姆
10giq嘉泰姆	12giq嘉泰姆	10giq嘉泰姆	OCSETgiq嘉泰姆	Connect a resistor (ROCSET) from this pin to GND, an internal 40mA current source will flow through this resistor and create a voltage drop. When VCC12 reaches the POR rising threshold voltage, the voltage drop of ROCSET will begiq嘉泰姆 memoried and compared with the voltage across the lower MOSFET. The threshold of the over current limit is therefore given by: IOCSET × ROCSET ILIMIT = RDS(ON)(LOW − Side)giq嘉泰姆 The CXSD6273 has a internal OCP voltage source, and the value is around 0.25V. When the ROCSET x IOCSET is bigger than 0.25V or the OCSET PIN is floating (no ROCSET resistor), the over current threshold will be the internal default value 0.25V.giq嘉泰姆
11giq嘉泰姆	13giq嘉泰姆	11giq嘉泰姆	LGATEgiq嘉泰姆	This pin is the gate driver for the lower MOSFET of PWM output.giq嘉泰姆
12giq嘉泰姆	14giq嘉泰姆	12giq嘉泰姆	PGNDgiq嘉泰姆	This pin is the power ground pin for the lower gate driver. It should be tied to GND pin on the board.giq嘉泰姆
13giq嘉泰姆	15giq嘉泰姆	13giq嘉泰姆	PHASEgiq嘉泰姆	This pin is the return path for the upper gate driver. Connect this pin to the upper MOSFET source, and connect a capacitor to BOOT for the bootstrap voltage. This pin is also used to monitor the voltage drop across the lowergiq嘉泰姆 MOSFET for over-current protection.giq嘉泰姆
14giq嘉泰姆	16giq嘉泰姆	14giq嘉泰姆	UGATEgiq嘉泰姆	This pin is the gate driver for the upper MOSFET of PWM output.giq嘉泰姆

六.电路原理图giq嘉泰姆

giq嘉泰姆

七,功能概述giq嘉泰姆

Function Description (Cont.)giq嘉泰姆

Over-Current Protection (Cont.)giq嘉泰姆
When OCSET PIN is floating, the VOCSET will be pulled high and the over current threshold will be thegiq嘉泰姆

internal default value 0.25V. When the voltage drop across the lower MOSFET’s RDS(ON) is larger thangiq嘉泰姆

0.25V, an over-cur-rent condition is detected, the controller will shutdown the IC directly, and latch giq嘉泰姆

the converter’s output. giq嘉泰姆
Over Voltage Protectiongiq嘉泰姆
The FB pin is monitored during converter operation by its own Over Voltage(OV) comparator. If thegiq嘉泰姆

FB voltage is over 135% of the reference voltage, the controller will make Low-Side gate signal fully giq嘉泰姆

turn on until the fault events are removed.giq嘉泰姆
Under Voltage Protectiongiq嘉泰姆
The FBL pin is monitored during converter operation by its own Under Voltage (UV) comparator. If giq嘉泰姆

the FBL voltage drop below 50% of the reference voltage (50% of 0.8V =0.4V), a fault signal is giq嘉泰姆

internally generated, and the de-vice turns off both high-side and low-side MOSFET and the giq嘉泰姆

converter’s output is latched to be floating. The con-troller will shutdown the IC directly.giq嘉泰姆
Shutdown and Enablegiq嘉泰姆
Pulling low the FS_DIS pin near GND by an open drain transistor or other pull-down device giq嘉泰姆

(<1k. impedance)will shutdown both regulators. Upon release of the FS_DIS pin, it willgiq嘉泰姆

enable both outputs back into regulation. In shutdown mode, the UGATE and LGATEgiq嘉泰姆

turn off and pull to PHASE and GND respectively.giq嘉泰姆

八,相关产品 更多同类产品...... giq嘉泰姆

Switching Regulator > Buck Controllergiq嘉泰姆
Part_No giq嘉泰姆	Package giq嘉泰姆	Archigiq嘉泰姆 tectugiq嘉泰姆	Phasegiq嘉泰姆	No.ofgiq嘉泰姆 PWMgiq嘉泰姆 Outputgiq嘉泰姆	Output giq嘉泰姆 Currentgiq嘉泰姆 (A) giq嘉泰姆	Inputgiq嘉泰姆 Voltage (V) giq嘉泰姆		Referencegiq嘉泰姆 Voltagegiq嘉泰姆 (V) giq嘉泰姆	Bias giq嘉泰姆 Voltagegiq嘉泰姆 (V) giq嘉泰姆	Quiescentgiq嘉泰姆 Currentgiq嘉泰姆 (uA) giq嘉泰姆
Part_No giq嘉泰姆	Package giq嘉泰姆	Archigiq嘉泰姆 tectugiq嘉泰姆	Phasegiq嘉泰姆	No.ofgiq嘉泰姆 PWMgiq嘉泰姆 Outputgiq嘉泰姆	Output giq嘉泰姆 Currentgiq嘉泰姆 (A) giq嘉泰姆	mingiq嘉泰姆	maxgiq嘉泰姆	Referencegiq嘉泰姆 Voltagegiq嘉泰姆 (V) giq嘉泰姆	Bias giq嘉泰姆 Voltagegiq嘉泰姆 (V) giq嘉泰姆	Quiescentgiq嘉泰姆 Currentgiq嘉泰姆 (uA) giq嘉泰姆
CXSD6273giq嘉泰姆	SOP-14giq嘉泰姆 QSOP-16giq嘉泰姆 QFN4x4-16giq嘉泰姆	VM giq嘉泰姆	1 giq嘉泰姆	1 giq嘉泰姆	30giq嘉泰姆	2.9 giq嘉泰姆	13.2giq嘉泰姆	0.9giq嘉泰姆	12 giq嘉泰姆	8000giq嘉泰姆
CXSD6274giq嘉泰姆	SOP-8giq嘉泰姆	VM giq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	20giq嘉泰姆	2.9 giq嘉泰姆	13.2 giq嘉泰姆	0.8giq嘉泰姆	12giq嘉泰姆	5000giq嘉泰姆
CXSD6274Cgiq嘉泰姆	SOP-8giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	20giq嘉泰姆	2.9giq嘉泰姆	13.2giq嘉泰姆	0.8giq嘉泰姆	12giq嘉泰姆	5000giq嘉泰姆
CXSD6275giq嘉泰姆	QFN4x4-24giq嘉泰姆	VMgiq嘉泰姆	2giq嘉泰姆	1giq嘉泰姆	60giq嘉泰姆	3.1giq嘉泰姆	13.2giq嘉泰姆	0.6giq嘉泰姆	12giq嘉泰姆	5000giq嘉泰姆
CXSD6276giq嘉泰姆	SOP-8giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	20giq嘉泰姆	2.2giq嘉泰姆	13.2giq嘉泰姆	0.8giq嘉泰姆	5~12giq嘉泰姆	2100giq嘉泰姆
CXSD6276Agiq嘉泰姆	SOP-8giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	20giq嘉泰姆	2.2giq嘉泰姆	13.2giq嘉泰姆	0.8giq嘉泰姆	5~12giq嘉泰姆	2100giq嘉泰姆
CXSD6277/A/Bgiq嘉泰姆	SOP8\|TSSOP8giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	5giq嘉泰姆	5giq嘉泰姆	13.2giq嘉泰姆	1.25\|0.8giq嘉泰姆	5~12giq嘉泰姆	3000giq嘉泰姆
CXSD6278giq嘉泰姆	SOP-8giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	10giq嘉泰姆	3.3giq嘉泰姆	5.5giq嘉泰姆	0.8giq嘉泰姆	5giq嘉泰姆	2100giq嘉泰姆
CXSD6279Bgiq嘉泰姆	SOP-14giq嘉泰姆	VM giq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	10giq嘉泰姆	5giq嘉泰姆	13.2giq嘉泰姆	0.8giq嘉泰姆	12giq嘉泰姆	2000giq嘉泰姆
CXSD6280giq嘉泰姆	TSSOP-24giq嘉泰姆 \|QFN5x5-32giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	2giq嘉泰姆	20giq嘉泰姆	5giq嘉泰姆	13.2giq嘉泰姆	0.6giq嘉泰姆	5~12giq嘉泰姆	4000giq嘉泰姆
CXSD6281Ngiq嘉泰姆	SOP14giq嘉泰姆 QSOP16giq嘉泰姆 QFN-16giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	30giq嘉泰姆	2.9giq嘉泰姆	13.2giq嘉泰姆	0.9giq嘉泰姆	12giq嘉泰姆	4000giq嘉泰姆
CXSD6282giq嘉泰姆	SOP-14giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	30giq嘉泰姆	2.2giq嘉泰姆	13.2giq嘉泰姆	0.6giq嘉泰姆	12giq嘉泰姆	5000giq嘉泰姆
CXSD6282Agiq嘉泰姆	SOP-14giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	30giq嘉泰姆	2.2giq嘉泰姆	13.2giq嘉泰姆	0.6giq嘉泰姆	12giq嘉泰姆	5000giq嘉泰姆
CXSD6283giq嘉泰姆	SOP-14giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	25giq嘉泰姆	2.2giq嘉泰姆	13.2giq嘉泰姆	0.8giq嘉泰姆	12giq嘉泰姆	5000giq嘉泰姆
CXSD6284/Agiq嘉泰姆	LQFP7x7 48giq嘉泰姆 TQFN7x7-48giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	6giq嘉泰姆	0.015giq嘉泰姆	1.4giq嘉泰姆	6.5giq嘉泰姆	-giq嘉泰姆	5giq嘉泰姆	1800giq嘉泰姆
CXSD6285giq嘉泰姆	TSSOP-24Pgiq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	2giq嘉泰姆	20giq嘉泰姆	2.97giq嘉泰姆	5.5giq嘉泰姆	0.8giq嘉泰姆	5~12giq嘉泰姆	5000giq嘉泰姆
CXSD6286giq嘉泰姆	SOP-14giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	10giq嘉泰姆	5giq嘉泰姆	13.2giq嘉泰姆	0.8giq嘉泰姆	12giq嘉泰姆	3000giq嘉泰姆
CXSD6287giq嘉泰姆	SOP-8-P\|DIP-8giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	1giq嘉泰姆	30giq嘉泰姆	2.9giq嘉泰姆	13.2giq嘉泰姆	1.2giq嘉泰姆	12giq嘉泰姆	3000giq嘉泰姆
CXSD6288giq嘉泰姆	SSOP28giq嘉泰姆 QFN4x4-24giq嘉泰姆	VMgiq嘉泰姆	1giq嘉泰姆	2giq嘉泰姆	20giq嘉泰姆	5giq嘉泰姆	24giq嘉泰姆	0.9giq嘉泰姆	5</giq嘉泰姆

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