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：164

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uxL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) uxL嘉泰姆

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

1.)Two Regulated Voltages and REF_OUT Synchronous Buck ConverteruxL嘉泰姆
Linear RegulatoruxL嘉泰姆
REF_OUT = 0.8V±1% with 3mA Source CurrentuxL嘉泰姆
2.)Single 12V Power Supply RequireduxL嘉泰姆
3.)Excellent Both Output Voltage RegulationuxL嘉泰姆
0.8V Internal ReferenceuxL嘉泰姆
±1% Over Line Voltage and TemperatureuxL嘉泰姆
4.)Integrated Soft-Start for PWM and Linear OutputsuxL嘉泰姆
5.)300KHz Fixed Switching FrequencyuxL嘉泰姆
6.)Voltage Mode PWM Control Design and Up to 89%(Typ.) Duty CycleuxL嘉泰姆
7.)Under-Voltage Protection Monitoring Linear Out-putuxL嘉泰姆
8.)Over-Voltage Protection Monitoring PWM OutputuxL嘉泰姆
9.)Over-Current Protection for PWM Output Sense Low-side MOSFET’s RDS(ON)uxL嘉泰姆

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

Graphic CardsuxL嘉泰姆
四.下载产品资料PDF文档 uxL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！uxL嘉泰姆

QQ截图20160419174301.jpg uxL嘉泰姆

五,产品封装图 (Package)uxL嘉泰姆
uxL嘉泰姆
FUNCTION NAMEFUNCTIONuxL嘉泰姆

PIN NO.uxL嘉泰姆			NAMEuxL嘉泰姆	FUNCTIONuxL嘉泰姆


SOP-14uxL嘉泰姆	SSOP-16uxL嘉泰姆	QFN4x4-16uxL嘉泰姆
1uxL嘉泰姆	15uxL嘉泰姆		BOOTuxL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 voltageuxL嘉泰姆 for the upper gate diver (UGATE).uxL嘉泰姆
2uxL嘉泰姆	2uxL嘉泰姆	16uxL嘉泰姆	FS_DISuxL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 willuxL嘉泰姆 enable both outputs back into regulation.uxL嘉泰姆
3uxL嘉泰姆	3uxL嘉泰姆	1uxL嘉泰姆	COMPuxL嘉泰姆	This pin is the output of PWM error amplifier. It is used to set the compensation components.uxL嘉泰姆
4uxL嘉泰姆	4uxL嘉泰姆	2uxL嘉泰姆	FBuxL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 monitoreduxL嘉泰姆 for under-voltage protection, when the FB voltage is under 50% of referenceuxL嘉泰姆 voltage (0.4V), both outputs will be shutdowned immediately.uxL嘉泰姆
5uxL嘉泰姆	5uxL嘉泰姆	3uxL嘉泰姆	DRIVEuxL嘉泰姆	This pin drives the gate of an external N-channel MOSFET for linear regulator.uxL嘉泰姆 It is also used to set the compensation for some specific applications, foruxL嘉泰姆 example, with low values of output capacitance and ESR.uxL嘉泰姆
6uxL嘉泰姆	6uxL嘉泰姆	4uxL嘉泰姆	FBLuxL嘉泰姆	This pin is the inverting input of the linear regulator error amplifier. It is used touxL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.uxL嘉泰姆
7uxL嘉泰姆	7,8uxL嘉泰姆	5,6uxL嘉泰姆	GNDuxL嘉泰姆	This pin is the signal ground pin. Connect the GND pin to a good ground plane.uxL嘉泰姆
8uxL嘉泰姆	9,10uxL嘉泰姆	7,8uxL嘉泰姆	VCC12uxL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.uxL嘉泰姆
9uxL嘉泰姆	11uxL嘉泰姆	9uxL嘉泰姆	REF_OUTuxL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.uxL嘉泰姆 When VOCSET is above 1V, the REF_OUT buffer will be closed, the VREF_OUT is 0V.uxL嘉泰姆
10uxL嘉泰姆	12uxL嘉泰姆	10uxL嘉泰姆	OCSETuxL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 beuxL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)uxL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.uxL嘉泰姆
11uxL嘉泰姆	13uxL嘉泰姆	11uxL嘉泰姆	LGATEuxL嘉泰姆	This pin is the gate driver for the lower MOSFET of PWM output.uxL嘉泰姆
12uxL嘉泰姆	14uxL嘉泰姆	12uxL嘉泰姆	PGNDuxL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.uxL嘉泰姆
13uxL嘉泰姆	15uxL嘉泰姆	13uxL嘉泰姆	PHASEuxL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 loweruxL嘉泰姆 MOSFET for over-current protection.uxL嘉泰姆
14uxL嘉泰姆	16uxL嘉泰姆	14uxL嘉泰姆	UGATEuxL嘉泰姆	This pin is the gate driver for the upper MOSFET of PWM output.uxL嘉泰姆

六.电路原理图uxL嘉泰姆

uxL嘉泰姆

七,功能概述uxL嘉泰姆

Function Description (Cont.)uxL嘉泰姆

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

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

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

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

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

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

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

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

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

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

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

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

八,相关产品 更多同类产品...... uxL嘉泰姆

Switching Regulator > Buck ControlleruxL嘉泰姆
Part_No uxL嘉泰姆	Package uxL嘉泰姆	ArchiuxL嘉泰姆 tectuuxL嘉泰姆	PhaseuxL嘉泰姆	No.ofuxL嘉泰姆 PWMuxL嘉泰姆 OutputuxL嘉泰姆	Output uxL嘉泰姆 CurrentuxL嘉泰姆 (A) uxL嘉泰姆	InputuxL嘉泰姆 Voltage (V) uxL嘉泰姆		ReferenceuxL嘉泰姆 VoltageuxL嘉泰姆 (V) uxL嘉泰姆	Bias uxL嘉泰姆 VoltageuxL嘉泰姆 (V) uxL嘉泰姆	QuiescentuxL嘉泰姆 CurrentuxL嘉泰姆 (uA) uxL嘉泰姆
Part_No uxL嘉泰姆	Package uxL嘉泰姆	ArchiuxL嘉泰姆 tectuuxL嘉泰姆	PhaseuxL嘉泰姆	No.ofuxL嘉泰姆 PWMuxL嘉泰姆 OutputuxL嘉泰姆	Output uxL嘉泰姆 CurrentuxL嘉泰姆 (A) uxL嘉泰姆	minuxL嘉泰姆	maxuxL嘉泰姆	ReferenceuxL嘉泰姆 VoltageuxL嘉泰姆 (V) uxL嘉泰姆	Bias uxL嘉泰姆 VoltageuxL嘉泰姆 (V) uxL嘉泰姆	QuiescentuxL嘉泰姆 CurrentuxL嘉泰姆 (uA) uxL嘉泰姆
CXSD6273uxL嘉泰姆	SOP-14uxL嘉泰姆 QSOP-16uxL嘉泰姆 QFN4x4-16uxL嘉泰姆	VM uxL嘉泰姆	1 uxL嘉泰姆	1 uxL嘉泰姆	30uxL嘉泰姆	2.9 uxL嘉泰姆	13.2uxL嘉泰姆	0.9uxL嘉泰姆	12 uxL嘉泰姆	8000uxL嘉泰姆
CXSD6274uxL嘉泰姆	SOP-8uxL嘉泰姆	VM uxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	20uxL嘉泰姆	2.9 uxL嘉泰姆	13.2 uxL嘉泰姆	0.8uxL嘉泰姆	12uxL嘉泰姆	5000uxL嘉泰姆
CXSD6274CuxL嘉泰姆	SOP-8uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	20uxL嘉泰姆	2.9uxL嘉泰姆	13.2uxL嘉泰姆	0.8uxL嘉泰姆	12uxL嘉泰姆	5000uxL嘉泰姆
CXSD6275uxL嘉泰姆	QFN4x4-24uxL嘉泰姆	VMuxL嘉泰姆	2uxL嘉泰姆	1uxL嘉泰姆	60uxL嘉泰姆	3.1uxL嘉泰姆	13.2uxL嘉泰姆	0.6uxL嘉泰姆	12uxL嘉泰姆	5000uxL嘉泰姆
CXSD6276uxL嘉泰姆	SOP-8uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	20uxL嘉泰姆	2.2uxL嘉泰姆	13.2uxL嘉泰姆	0.8uxL嘉泰姆	5~12uxL嘉泰姆	2100uxL嘉泰姆
CXSD6276AuxL嘉泰姆	SOP-8uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	20uxL嘉泰姆	2.2uxL嘉泰姆	13.2uxL嘉泰姆	0.8uxL嘉泰姆	5~12uxL嘉泰姆	2100uxL嘉泰姆
CXSD6277/A/BuxL嘉泰姆	SOP8\|TSSOP8uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	5uxL嘉泰姆	5uxL嘉泰姆	13.2uxL嘉泰姆	1.25\|0.8uxL嘉泰姆	5~12uxL嘉泰姆	3000uxL嘉泰姆
CXSD6278uxL嘉泰姆	SOP-8uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	10uxL嘉泰姆	3.3uxL嘉泰姆	5.5uxL嘉泰姆	0.8uxL嘉泰姆	5uxL嘉泰姆	2100uxL嘉泰姆
CXSD6279BuxL嘉泰姆	SOP-14uxL嘉泰姆	VM uxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	10uxL嘉泰姆	5uxL嘉泰姆	13.2uxL嘉泰姆	0.8uxL嘉泰姆	12uxL嘉泰姆	2000uxL嘉泰姆
CXSD6280uxL嘉泰姆	TSSOP-24uxL嘉泰姆 \|QFN5x5-32uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	2uxL嘉泰姆	20uxL嘉泰姆	5uxL嘉泰姆	13.2uxL嘉泰姆	0.6uxL嘉泰姆	5~12uxL嘉泰姆	4000uxL嘉泰姆
CXSD6281NuxL嘉泰姆	SOP14uxL嘉泰姆 QSOP16uxL嘉泰姆 QFN-16uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	30uxL嘉泰姆	2.9uxL嘉泰姆	13.2uxL嘉泰姆	0.9uxL嘉泰姆	12uxL嘉泰姆	4000uxL嘉泰姆
CXSD6282uxL嘉泰姆	SOP-14uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	30uxL嘉泰姆	2.2uxL嘉泰姆	13.2uxL嘉泰姆	0.6uxL嘉泰姆	12uxL嘉泰姆	5000uxL嘉泰姆
CXSD6282AuxL嘉泰姆	SOP-14uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	30uxL嘉泰姆	2.2uxL嘉泰姆	13.2uxL嘉泰姆	0.6uxL嘉泰姆	12uxL嘉泰姆	5000uxL嘉泰姆
CXSD6283uxL嘉泰姆	SOP-14uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	25uxL嘉泰姆	2.2uxL嘉泰姆	13.2uxL嘉泰姆	0.8uxL嘉泰姆	12uxL嘉泰姆	5000uxL嘉泰姆
CXSD6284/AuxL嘉泰姆	LQFP7x7 48uxL嘉泰姆 TQFN7x7-48uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	6uxL嘉泰姆	0.015uxL嘉泰姆	1.4uxL嘉泰姆	6.5uxL嘉泰姆	-uxL嘉泰姆	5uxL嘉泰姆	1800uxL嘉泰姆
CXSD6285uxL嘉泰姆	TSSOP-24PuxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	2uxL嘉泰姆	20uxL嘉泰姆	2.97uxL嘉泰姆	5.5uxL嘉泰姆	0.8uxL嘉泰姆	5~12uxL嘉泰姆	5000uxL嘉泰姆
CXSD6286uxL嘉泰姆	SOP-14uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	10uxL嘉泰姆	5uxL嘉泰姆	13.2uxL嘉泰姆	0.8uxL嘉泰姆	12uxL嘉泰姆	3000uxL嘉泰姆
CXSD6287uxL嘉泰姆	SOP-8-P\|DIP-8uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	1uxL嘉泰姆	30uxL嘉泰姆	2.9uxL嘉泰姆	13.2uxL嘉泰姆	1.2uxL嘉泰姆	12uxL嘉泰姆	3000uxL嘉泰姆
CXSD6288uxL嘉泰姆	SSOP28uxL嘉泰姆 QFN4x4-24uxL嘉泰姆	VMuxL嘉泰姆	1uxL嘉泰姆	2uxL嘉泰姆	20uxL嘉泰姆	5uxL嘉泰姆	24uxL嘉泰姆	0.9uxL嘉泰姆	5</uxL嘉泰姆

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