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：153

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sI6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) sI6嘉泰姆

The CXSD6273 integrates synchronous buck PWM, linear controller, and 0.8V ReferencesI6嘉泰姆
Out Voltage, as well as the monitoring and protection functions into a single package. The sI6嘉泰姆
fixed 300kHz switching frequency synchro-nous PWM controller drives dual N-channelsI6嘉泰姆
MOSFETs,which provides one controlled power output with over-voltage and over-currentsI6嘉泰姆
protections. Linear controller drives an external N-channel MOSFET with under-volt-sI6嘉泰姆
age protection.sI6嘉泰姆
The CXSD6273 provides excellent regulation for output load variation. An internal 0.8VsI6嘉泰姆
temperature-compensated ref-erence voltage is designed to meet the requirement ofsI6嘉泰姆
low output voltage applications.sI6嘉泰姆
The CXSD6273 with excellent protection functions: POR,OCP, OVP and UVP. ThesI6嘉泰姆
Power-On-Reset (POR) circuit can monitor VCC12 supply voltage exceeds its thresholdsI6嘉泰姆
voltage while the controller is running, and a built-in digi-tal soft-start provides both outputssI6嘉泰姆
with controlled rising voltage. The Over-Current Protection (OCP) monitors the output currentsI6嘉泰姆
by using the voltage drop across the lower MOSFET’s RDS(ON), comparing with the voltagesI6嘉泰姆
of OCSET pin, VOCSET. The maximum VOCSET voltage is limited to the internal default valuesI6嘉泰姆
0.25V. In addition, when OCSET pin is floating (no ROCSET resistor), the over current thresholdsI6嘉泰姆
will also be internal default value, 0.25V. When the output current reaches the trip point, thesI6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 thansI6嘉泰姆
50% of VREF, the controller will shutdown the IC directly.The Over-Voltage Protection (OVP)sI6嘉泰姆
monitors the voltage of FB. When the VFB is over 135% of VREF, the controller willsI6嘉泰姆
make Low-side gate signal fully turn on until the fault events are removed.sI6嘉泰姆
二.产品特点(Features)sI6嘉泰姆

1.)Two Regulated Voltages and REF_OUT Synchronous Buck ConvertersI6嘉泰姆
Linear RegulatorsI6嘉泰姆
REF_OUT = 0.8V±1% with 3mA Source CurrentsI6嘉泰姆
2.)Single 12V Power Supply RequiredsI6嘉泰姆
3.)Excellent Both Output Voltage RegulationsI6嘉泰姆
0.8V Internal ReferencesI6嘉泰姆
±1% Over Line Voltage and TemperaturesI6嘉泰姆
4.)Integrated Soft-Start for PWM and Linear OutputssI6嘉泰姆
5.)300KHz Fixed Switching FrequencysI6嘉泰姆
6.)Voltage Mode PWM Control Design and Up to 89%(Typ.) Duty CyclesI6嘉泰姆
7.)Under-Voltage Protection Monitoring Linear Out-putsI6嘉泰姆
8.)Over-Voltage Protection Monitoring PWM OutputsI6嘉泰姆
9.)Over-Current Protection for PWM Output Sense Low-side MOSFET’s RDS(ON)sI6嘉泰姆

10.)SOP-14, SSOP-16 and Compact QFN4x4-16 pack-agessI6嘉泰姆
11.)Lead Free and Green Devices Available(RoHS Compliant)sI6嘉泰姆
三,应用范围 (Applications)sI6嘉泰姆

Graphic CardssI6嘉泰姆
四.下载产品资料PDF文档 sI6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！sI6嘉泰姆

QQ截图20160419174301.jpg sI6嘉泰姆

五,产品封装图 (Package)sI6嘉泰姆
sI6嘉泰姆
FUNCTION NAMEFUNCTIONsI6嘉泰姆

PIN NO.sI6嘉泰姆			NAMEsI6嘉泰姆	FUNCTIONsI6嘉泰姆


SOP-14sI6嘉泰姆	SSOP-16sI6嘉泰姆	QFN4x4-16sI6嘉泰姆
1sI6嘉泰姆	15sI6嘉泰姆		BOOTsI6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 voltagesI6嘉泰姆 for the upper gate diver (UGATE).sI6嘉泰姆
2sI6嘉泰姆	2sI6嘉泰姆	16sI6嘉泰姆	FS_DISsI6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 willsI6嘉泰姆 enable both outputs back into regulation.sI6嘉泰姆
3sI6嘉泰姆	3sI6嘉泰姆	1sI6嘉泰姆	COMPsI6嘉泰姆	This pin is the output of PWM error amplifier. It is used to set the compensation components.sI6嘉泰姆
4sI6嘉泰姆	4sI6嘉泰姆	2sI6嘉泰姆	FBsI6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 monitoredsI6嘉泰姆 for under-voltage protection, when the FB voltage is under 50% of referencesI6嘉泰姆 voltage (0.4V), both outputs will be shutdowned immediately.sI6嘉泰姆
5sI6嘉泰姆	5sI6嘉泰姆	3sI6嘉泰姆	DRIVEsI6嘉泰姆	This pin drives the gate of an external N-channel MOSFET for linear regulator.sI6嘉泰姆 It is also used to set the compensation for some specific applications, forsI6嘉泰姆 example, with low values of output capacitance and ESR.sI6嘉泰姆
6sI6嘉泰姆	6sI6嘉泰姆	4sI6嘉泰姆	FBLsI6嘉泰姆	This pin is the inverting input of the linear regulator error amplifier. It is used tosI6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.sI6嘉泰姆
7sI6嘉泰姆	7,8sI6嘉泰姆	5,6sI6嘉泰姆	GNDsI6嘉泰姆	This pin is the signal ground pin. Connect the GND pin to a good ground plane.sI6嘉泰姆
8sI6嘉泰姆	9,10sI6嘉泰姆	7,8sI6嘉泰姆	VCC12sI6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.sI6嘉泰姆
9sI6嘉泰姆	11sI6嘉泰姆	9sI6嘉泰姆	REF_OUTsI6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.sI6嘉泰姆 When VOCSET is above 1V, the REF_OUT buffer will be closed, the VREF_OUT is 0V.sI6嘉泰姆
10sI6嘉泰姆	12sI6嘉泰姆	10sI6嘉泰姆	OCSETsI6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 besI6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)sI6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.sI6嘉泰姆
11sI6嘉泰姆	13sI6嘉泰姆	11sI6嘉泰姆	LGATEsI6嘉泰姆	This pin is the gate driver for the lower MOSFET of PWM output.sI6嘉泰姆
12sI6嘉泰姆	14sI6嘉泰姆	12sI6嘉泰姆	PGNDsI6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.sI6嘉泰姆
13sI6嘉泰姆	15sI6嘉泰姆	13sI6嘉泰姆	PHASEsI6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 lowersI6嘉泰姆 MOSFET for over-current protection.sI6嘉泰姆
14sI6嘉泰姆	16sI6嘉泰姆	14sI6嘉泰姆	UGATEsI6嘉泰姆	This pin is the gate driver for the upper MOSFET of PWM output.sI6嘉泰姆

六.电路原理图sI6嘉泰姆

sI6嘉泰姆

七,功能概述sI6嘉泰姆

Function Description (Cont.)sI6嘉泰姆

Over-Current Protection (Cont.)sI6嘉泰姆
When OCSET PIN is floating, the VOCSET will be pulled high and the over current threshold will be thesI6嘉泰姆

internal default value 0.25V. When the voltage drop across the lower MOSFET’s RDS(ON) is larger thansI6嘉泰姆

0.25V, an over-cur-rent condition is detected, the controller will shutdown the IC directly, and latch sI6嘉泰姆

the converter’s output. sI6嘉泰姆
Over Voltage ProtectionsI6嘉泰姆
The FB pin is monitored during converter operation by its own Over Voltage(OV) comparator. If thesI6嘉泰姆

FB voltage is over 135% of the reference voltage, the controller will make Low-Side gate signal fully sI6嘉泰姆

turn on until the fault events are removed.sI6嘉泰姆
Under Voltage ProtectionsI6嘉泰姆
The FBL pin is monitored during converter operation by its own Under Voltage (UV) comparator. If sI6嘉泰姆

the FBL voltage drop below 50% of the reference voltage (50% of 0.8V =0.4V), a fault signal is sI6嘉泰姆

internally generated, and the de-vice turns off both high-side and low-side MOSFET and the sI6嘉泰姆

converter’s output is latched to be floating. The con-troller will shutdown the IC directly.sI6嘉泰姆
Shutdown and EnablesI6嘉泰姆
Pulling low the FS_DIS pin near GND by an open drain transistor or other pull-down device sI6嘉泰姆

(<1k. impedance)will shutdown both regulators. Upon release of the FS_DIS pin, it willsI6嘉泰姆

enable both outputs back into regulation. In shutdown mode, the UGATE and LGATEsI6嘉泰姆

turn off and pull to PHASE and GND respectively.sI6嘉泰姆

八,相关产品 更多同类产品...... sI6嘉泰姆

Switching Regulator > Buck ControllersI6嘉泰姆
Part_No sI6嘉泰姆	Package sI6嘉泰姆	ArchisI6嘉泰姆 tectusI6嘉泰姆	PhasesI6嘉泰姆	No.ofsI6嘉泰姆 PWMsI6嘉泰姆 OutputsI6嘉泰姆	Output sI6嘉泰姆 CurrentsI6嘉泰姆 (A) sI6嘉泰姆	InputsI6嘉泰姆 Voltage (V) sI6嘉泰姆		ReferencesI6嘉泰姆 VoltagesI6嘉泰姆 (V) sI6嘉泰姆	Bias sI6嘉泰姆 VoltagesI6嘉泰姆 (V) sI6嘉泰姆	QuiescentsI6嘉泰姆 CurrentsI6嘉泰姆 (uA) sI6嘉泰姆
Part_No sI6嘉泰姆	Package sI6嘉泰姆	ArchisI6嘉泰姆 tectusI6嘉泰姆	PhasesI6嘉泰姆	No.ofsI6嘉泰姆 PWMsI6嘉泰姆 OutputsI6嘉泰姆	Output sI6嘉泰姆 CurrentsI6嘉泰姆 (A) sI6嘉泰姆	minsI6嘉泰姆	maxsI6嘉泰姆	ReferencesI6嘉泰姆 VoltagesI6嘉泰姆 (V) sI6嘉泰姆	Bias sI6嘉泰姆 VoltagesI6嘉泰姆 (V) sI6嘉泰姆	QuiescentsI6嘉泰姆 CurrentsI6嘉泰姆 (uA) sI6嘉泰姆
CXSD6273sI6嘉泰姆	SOP-14sI6嘉泰姆 QSOP-16sI6嘉泰姆 QFN4x4-16sI6嘉泰姆	VM sI6嘉泰姆	1 sI6嘉泰姆	1 sI6嘉泰姆	30sI6嘉泰姆	2.9 sI6嘉泰姆	13.2sI6嘉泰姆	0.9sI6嘉泰姆	12 sI6嘉泰姆	8000sI6嘉泰姆
CXSD6274sI6嘉泰姆	SOP-8sI6嘉泰姆	VM sI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	20sI6嘉泰姆	2.9 sI6嘉泰姆	13.2 sI6嘉泰姆	0.8sI6嘉泰姆	12sI6嘉泰姆	5000sI6嘉泰姆
CXSD6274CsI6嘉泰姆	SOP-8sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	20sI6嘉泰姆	2.9sI6嘉泰姆	13.2sI6嘉泰姆	0.8sI6嘉泰姆	12sI6嘉泰姆	5000sI6嘉泰姆
CXSD6275sI6嘉泰姆	QFN4x4-24sI6嘉泰姆	VMsI6嘉泰姆	2sI6嘉泰姆	1sI6嘉泰姆	60sI6嘉泰姆	3.1sI6嘉泰姆	13.2sI6嘉泰姆	0.6sI6嘉泰姆	12sI6嘉泰姆	5000sI6嘉泰姆
CXSD6276sI6嘉泰姆	SOP-8sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	20sI6嘉泰姆	2.2sI6嘉泰姆	13.2sI6嘉泰姆	0.8sI6嘉泰姆	5~12sI6嘉泰姆	2100sI6嘉泰姆
CXSD6276AsI6嘉泰姆	SOP-8sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	20sI6嘉泰姆	2.2sI6嘉泰姆	13.2sI6嘉泰姆	0.8sI6嘉泰姆	5~12sI6嘉泰姆	2100sI6嘉泰姆
CXSD6277/A/BsI6嘉泰姆	SOP8\|TSSOP8sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	5sI6嘉泰姆	5sI6嘉泰姆	13.2sI6嘉泰姆	1.25\|0.8sI6嘉泰姆	5~12sI6嘉泰姆	3000sI6嘉泰姆
CXSD6278sI6嘉泰姆	SOP-8sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	10sI6嘉泰姆	3.3sI6嘉泰姆	5.5sI6嘉泰姆	0.8sI6嘉泰姆	5sI6嘉泰姆	2100sI6嘉泰姆
CXSD6279BsI6嘉泰姆	SOP-14sI6嘉泰姆	VM sI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	10sI6嘉泰姆	5sI6嘉泰姆	13.2sI6嘉泰姆	0.8sI6嘉泰姆	12sI6嘉泰姆	2000sI6嘉泰姆
CXSD6280sI6嘉泰姆	TSSOP-24sI6嘉泰姆 \|QFN5x5-32sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	2sI6嘉泰姆	20sI6嘉泰姆	5sI6嘉泰姆	13.2sI6嘉泰姆	0.6sI6嘉泰姆	5~12sI6嘉泰姆	4000sI6嘉泰姆
CXSD6281NsI6嘉泰姆	SOP14sI6嘉泰姆 QSOP16sI6嘉泰姆 QFN-16sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	30sI6嘉泰姆	2.9sI6嘉泰姆	13.2sI6嘉泰姆	0.9sI6嘉泰姆	12sI6嘉泰姆	4000sI6嘉泰姆
CXSD6282sI6嘉泰姆	SOP-14sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	30sI6嘉泰姆	2.2sI6嘉泰姆	13.2sI6嘉泰姆	0.6sI6嘉泰姆	12sI6嘉泰姆	5000sI6嘉泰姆
CXSD6282AsI6嘉泰姆	SOP-14sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	30sI6嘉泰姆	2.2sI6嘉泰姆	13.2sI6嘉泰姆	0.6sI6嘉泰姆	12sI6嘉泰姆	5000sI6嘉泰姆
CXSD6283sI6嘉泰姆	SOP-14sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	25sI6嘉泰姆	2.2sI6嘉泰姆	13.2sI6嘉泰姆	0.8sI6嘉泰姆	12sI6嘉泰姆	5000sI6嘉泰姆
CXSD6284/AsI6嘉泰姆	LQFP7x7 48sI6嘉泰姆 TQFN7x7-48sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	6sI6嘉泰姆	0.015sI6嘉泰姆	1.4sI6嘉泰姆	6.5sI6嘉泰姆	-sI6嘉泰姆	5sI6嘉泰姆	1800sI6嘉泰姆
CXSD6285sI6嘉泰姆	TSSOP-24PsI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	2sI6嘉泰姆	20sI6嘉泰姆	2.97sI6嘉泰姆	5.5sI6嘉泰姆	0.8sI6嘉泰姆	5~12sI6嘉泰姆	5000sI6嘉泰姆
CXSD6286sI6嘉泰姆	SOP-14sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	10sI6嘉泰姆	5sI6嘉泰姆	13.2sI6嘉泰姆	0.8sI6嘉泰姆	12sI6嘉泰姆	3000sI6嘉泰姆
CXSD6287sI6嘉泰姆	SOP-8-P\|DIP-8sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	1sI6嘉泰姆	30sI6嘉泰姆	2.9sI6嘉泰姆	13.2sI6嘉泰姆	1.2sI6嘉泰姆	12sI6嘉泰姆	3000sI6嘉泰姆
CXSD6288sI6嘉泰姆	SSOP28sI6嘉泰姆 QFN4x4-24sI6嘉泰姆	VMsI6嘉泰姆	1sI6嘉泰姆	2sI6嘉泰姆	20sI6嘉泰姆	5sI6嘉泰姆	24sI6嘉泰姆	0.9sI6嘉泰姆	5</sI6嘉泰姆

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