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：212

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15f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) 15f嘉泰姆

The CXSD6273 integrates synchronous buck PWM, linear controller, and 0.8V Reference15f嘉泰姆
Out Voltage, as well as the monitoring and protection functions into a single package. The 15f嘉泰姆
fixed 300kHz switching frequency synchro-nous PWM controller drives dual N-channel15f嘉泰姆
MOSFETs,which provides one controlled power output with over-voltage and over-current15f嘉泰姆
protections. Linear controller drives an external N-channel MOSFET with under-volt-15f嘉泰姆
age protection.15f嘉泰姆
The CXSD6273 provides excellent regulation for output load variation. An internal 0.8V15f嘉泰姆
temperature-compensated ref-erence voltage is designed to meet the requirement of15f嘉泰姆
low output voltage applications.15f嘉泰姆
The CXSD6273 with excellent protection functions: POR,OCP, OVP and UVP. The15f嘉泰姆
Power-On-Reset (POR) circuit can monitor VCC12 supply voltage exceeds its threshold15f嘉泰姆
voltage while the controller is running, and a built-in digi-tal soft-start provides both outputs15f嘉泰姆
with controlled rising voltage. The Over-Current Protection (OCP) monitors the output current15f嘉泰姆
by using the voltage drop across the lower MOSFET’s RDS(ON), comparing with the voltage15f嘉泰姆
of OCSET pin, VOCSET. The maximum VOCSET voltage is limited to the internal default value15f嘉泰姆
0.25V. In addition, when OCSET pin is floating (no ROCSET resistor), the over current threshold15f嘉泰姆
will also be internal default value, 0.25V. When the output current reaches the trip point, the15f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 than15f嘉泰姆
50% of VREF, the controller will shutdown the IC directly.The Over-Voltage Protection (OVP)15f嘉泰姆
monitors the voltage of FB. When the VFB is over 135% of VREF, the controller will15f嘉泰姆
make Low-side gate signal fully turn on until the fault events are removed.15f嘉泰姆
二.产品特点(Features)15f嘉泰姆

1.)Two Regulated Voltages and REF_OUT Synchronous Buck Converter15f嘉泰姆
Linear Regulator15f嘉泰姆
REF_OUT = 0.8V±1% with 3mA Source Current15f嘉泰姆
2.)Single 12V Power Supply Required15f嘉泰姆
3.)Excellent Both Output Voltage Regulation15f嘉泰姆
0.8V Internal Reference15f嘉泰姆
±1% Over Line Voltage and Temperature15f嘉泰姆
4.)Integrated Soft-Start for PWM and Linear Outputs15f嘉泰姆
5.)300KHz Fixed Switching Frequency15f嘉泰姆
6.)Voltage Mode PWM Control Design and Up to 89%(Typ.) Duty Cycle15f嘉泰姆
7.)Under-Voltage Protection Monitoring Linear Out-put15f嘉泰姆
8.)Over-Voltage Protection Monitoring PWM Output15f嘉泰姆
9.)Over-Current Protection for PWM Output Sense Low-side MOSFET’s RDS(ON)15f嘉泰姆

10.)SOP-14, SSOP-16 and Compact QFN4x4-16 pack-ages15f嘉泰姆
11.)Lead Free and Green Devices Available(RoHS Compliant)15f嘉泰姆
三,应用范围 (Applications)15f嘉泰姆

Graphic Cards15f嘉泰姆
四.下载产品资料PDF文档 15f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！15f嘉泰姆

QQ截图20160419174301.jpg 15f嘉泰姆

五,产品封装图 (Package)15f嘉泰姆
15f嘉泰姆
FUNCTION NAMEFUNCTION15f嘉泰姆

PIN NO.15f嘉泰姆			NAME15f嘉泰姆	FUNCTION15f嘉泰姆


SOP-1415f嘉泰姆	SSOP-1615f嘉泰姆	QFN4x4-1615f嘉泰姆
115f嘉泰姆	1515f嘉泰姆		BOOT15f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 voltage15f嘉泰姆 for the upper gate diver (UGATE).15f嘉泰姆
215f嘉泰姆	215f嘉泰姆	1615f嘉泰姆	FS_DIS15f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 will15f嘉泰姆 enable both outputs back into regulation.15f嘉泰姆
315f嘉泰姆	315f嘉泰姆	115f嘉泰姆	COMP15f嘉泰姆	This pin is the output of PWM error amplifier. It is used to set the compensation components.15f嘉泰姆
415f嘉泰姆	415f嘉泰姆	215f嘉泰姆	FB15f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 monitored15f嘉泰姆 for under-voltage protection, when the FB voltage is under 50% of reference15f嘉泰姆 voltage (0.4V), both outputs will be shutdowned immediately.15f嘉泰姆
515f嘉泰姆	515f嘉泰姆	315f嘉泰姆	DRIVE15f嘉泰姆	This pin drives the gate of an external N-channel MOSFET for linear regulator.15f嘉泰姆 It is also used to set the compensation for some specific applications, for15f嘉泰姆 example, with low values of output capacitance and ESR.15f嘉泰姆
615f嘉泰姆	615f嘉泰姆	415f嘉泰姆	FBL15f嘉泰姆	This pin is the inverting input of the linear regulator error amplifier. It is used to15f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.15f嘉泰姆
715f嘉泰姆	7,815f嘉泰姆	5,615f嘉泰姆	GND15f嘉泰姆	This pin is the signal ground pin. Connect the GND pin to a good ground plane.15f嘉泰姆
815f嘉泰姆	9,1015f嘉泰姆	7,815f嘉泰姆	VCC1215f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.15f嘉泰姆
915f嘉泰姆	1115f嘉泰姆	915f嘉泰姆	REF_OUT15f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.15f嘉泰姆 When VOCSET is above 1V, the REF_OUT buffer will be closed, the VREF_OUT is 0V.15f嘉泰姆
1015f嘉泰姆	1215f嘉泰姆	1015f嘉泰姆	OCSET15f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 be15f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)15f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.15f嘉泰姆
1115f嘉泰姆	1315f嘉泰姆	1115f嘉泰姆	LGATE15f嘉泰姆	This pin is the gate driver for the lower MOSFET of PWM output.15f嘉泰姆
1215f嘉泰姆	1415f嘉泰姆	1215f嘉泰姆	PGND15f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.15f嘉泰姆
1315f嘉泰姆	1515f嘉泰姆	1315f嘉泰姆	PHASE15f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 lower15f嘉泰姆 MOSFET for over-current protection.15f嘉泰姆
1415f嘉泰姆	1615f嘉泰姆	1415f嘉泰姆	UGATE15f嘉泰姆	This pin is the gate driver for the upper MOSFET of PWM output.15f嘉泰姆

六.电路原理图15f嘉泰姆

15f嘉泰姆

七,功能概述15f嘉泰姆

Function Description (Cont.)15f嘉泰姆

Over-Current Protection (Cont.)15f嘉泰姆
When OCSET PIN is floating, the VOCSET will be pulled high and the over current threshold will be the15f嘉泰姆

internal default value 0.25V. When the voltage drop across the lower MOSFET’s RDS(ON) is larger than15f嘉泰姆

0.25V, an over-cur-rent condition is detected, the controller will shutdown the IC directly, and latch 15f嘉泰姆

the converter’s output. 15f嘉泰姆
Over Voltage Protection15f嘉泰姆
The FB pin is monitored during converter operation by its own Over Voltage(OV) comparator. If the15f嘉泰姆

FB voltage is over 135% of the reference voltage, the controller will make Low-Side gate signal fully 15f嘉泰姆

turn on until the fault events are removed.15f嘉泰姆
Under Voltage Protection15f嘉泰姆
The FBL pin is monitored during converter operation by its own Under Voltage (UV) comparator. If 15f嘉泰姆

the FBL voltage drop below 50% of the reference voltage (50% of 0.8V =0.4V), a fault signal is 15f嘉泰姆

internally generated, and the de-vice turns off both high-side and low-side MOSFET and the 15f嘉泰姆

converter’s output is latched to be floating. The con-troller will shutdown the IC directly.15f嘉泰姆
Shutdown and Enable15f嘉泰姆
Pulling low the FS_DIS pin near GND by an open drain transistor or other pull-down device 15f嘉泰姆

(<1k. impedance)will shutdown both regulators. Upon release of the FS_DIS pin, it will15f嘉泰姆

enable both outputs back into regulation. In shutdown mode, the UGATE and LGATE15f嘉泰姆

turn off and pull to PHASE and GND respectively.15f嘉泰姆

八,相关产品 更多同类产品...... 15f嘉泰姆

Switching Regulator > Buck Controller15f嘉泰姆
Part_No 15f嘉泰姆	Package 15f嘉泰姆	Archi15f嘉泰姆 tectu15f嘉泰姆	Phase15f嘉泰姆	No.of15f嘉泰姆 PWM15f嘉泰姆 Output15f嘉泰姆	Output 15f嘉泰姆 Current15f嘉泰姆 (A) 15f嘉泰姆	Input15f嘉泰姆 Voltage (V) 15f嘉泰姆		Reference15f嘉泰姆 Voltage15f嘉泰姆 (V) 15f嘉泰姆	Bias 15f嘉泰姆 Voltage15f嘉泰姆 (V) 15f嘉泰姆	Quiescent15f嘉泰姆 Current15f嘉泰姆 (uA) 15f嘉泰姆
Part_No 15f嘉泰姆	Package 15f嘉泰姆	Archi15f嘉泰姆 tectu15f嘉泰姆	Phase15f嘉泰姆	No.of15f嘉泰姆 PWM15f嘉泰姆 Output15f嘉泰姆	Output 15f嘉泰姆 Current15f嘉泰姆 (A) 15f嘉泰姆	min15f嘉泰姆	max15f嘉泰姆	Reference15f嘉泰姆 Voltage15f嘉泰姆 (V) 15f嘉泰姆	Bias 15f嘉泰姆 Voltage15f嘉泰姆 (V) 15f嘉泰姆	Quiescent15f嘉泰姆 Current15f嘉泰姆 (uA) 15f嘉泰姆
CXSD627315f嘉泰姆	SOP-1415f嘉泰姆 QSOP-1615f嘉泰姆 QFN4x4-1615f嘉泰姆	VM 15f嘉泰姆	1 15f嘉泰姆	1 15f嘉泰姆	3015f嘉泰姆	2.9 15f嘉泰姆	13.215f嘉泰姆	0.915f嘉泰姆	12 15f嘉泰姆	800015f嘉泰姆
CXSD627415f嘉泰姆	SOP-815f嘉泰姆	VM 15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	2015f嘉泰姆	2.9 15f嘉泰姆	13.2 15f嘉泰姆	0.815f嘉泰姆	1215f嘉泰姆	500015f嘉泰姆
CXSD6274C15f嘉泰姆	SOP-815f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	2015f嘉泰姆	2.915f嘉泰姆	13.215f嘉泰姆	0.815f嘉泰姆	1215f嘉泰姆	500015f嘉泰姆
CXSD627515f嘉泰姆	QFN4x4-2415f嘉泰姆	VM15f嘉泰姆	215f嘉泰姆	115f嘉泰姆	6015f嘉泰姆	3.115f嘉泰姆	13.215f嘉泰姆	0.615f嘉泰姆	1215f嘉泰姆	500015f嘉泰姆
CXSD627615f嘉泰姆	SOP-815f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	2015f嘉泰姆	2.215f嘉泰姆	13.215f嘉泰姆	0.815f嘉泰姆	5~1215f嘉泰姆	210015f嘉泰姆
CXSD6276A15f嘉泰姆	SOP-815f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	2015f嘉泰姆	2.215f嘉泰姆	13.215f嘉泰姆	0.815f嘉泰姆	5~1215f嘉泰姆	210015f嘉泰姆
CXSD6277/A/B15f嘉泰姆	SOP8\|TSSOP815f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	515f嘉泰姆	515f嘉泰姆	13.215f嘉泰姆	1.25\|0.815f嘉泰姆	5~1215f嘉泰姆	300015f嘉泰姆
CXSD627815f嘉泰姆	SOP-815f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	1015f嘉泰姆	3.315f嘉泰姆	5.515f嘉泰姆	0.815f嘉泰姆	515f嘉泰姆	210015f嘉泰姆
CXSD6279B15f嘉泰姆	SOP-1415f嘉泰姆	VM 15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	1015f嘉泰姆	515f嘉泰姆	13.215f嘉泰姆	0.815f嘉泰姆	1215f嘉泰姆	200015f嘉泰姆
CXSD628015f嘉泰姆	TSSOP-2415f嘉泰姆 \|QFN5x5-3215f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	215f嘉泰姆	2015f嘉泰姆	515f嘉泰姆	13.215f嘉泰姆	0.615f嘉泰姆	5~1215f嘉泰姆	400015f嘉泰姆
CXSD6281N15f嘉泰姆	SOP1415f嘉泰姆 QSOP1615f嘉泰姆 QFN-1615f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	3015f嘉泰姆	2.915f嘉泰姆	13.215f嘉泰姆	0.915f嘉泰姆	1215f嘉泰姆	400015f嘉泰姆
CXSD628215f嘉泰姆	SOP-1415f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	3015f嘉泰姆	2.215f嘉泰姆	13.215f嘉泰姆	0.615f嘉泰姆	1215f嘉泰姆	500015f嘉泰姆
CXSD6282A15f嘉泰姆	SOP-1415f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	3015f嘉泰姆	2.215f嘉泰姆	13.215f嘉泰姆	0.615f嘉泰姆	1215f嘉泰姆	500015f嘉泰姆
CXSD628315f嘉泰姆	SOP-1415f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	2515f嘉泰姆	2.215f嘉泰姆	13.215f嘉泰姆	0.815f嘉泰姆	1215f嘉泰姆	500015f嘉泰姆
CXSD6284/A15f嘉泰姆	LQFP7x7 4815f嘉泰姆 TQFN7x7-4815f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	615f嘉泰姆	0.01515f嘉泰姆	1.415f嘉泰姆	6.515f嘉泰姆	-15f嘉泰姆	515f嘉泰姆	180015f嘉泰姆
CXSD628515f嘉泰姆	TSSOP-24P15f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	215f嘉泰姆	2015f嘉泰姆	2.9715f嘉泰姆	5.515f嘉泰姆	0.815f嘉泰姆	5~1215f嘉泰姆	500015f嘉泰姆
CXSD628615f嘉泰姆	SOP-1415f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	1015f嘉泰姆	515f嘉泰姆	13.215f嘉泰姆	0.815f嘉泰姆	1215f嘉泰姆	300015f嘉泰姆
CXSD628715f嘉泰姆	SOP-8-P\|DIP-815f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	115f嘉泰姆	3015f嘉泰姆	2.915f嘉泰姆	13.215f嘉泰姆	1.215f嘉泰姆	1215f嘉泰姆	300015f嘉泰姆
CXSD628815f嘉泰姆	SSOP2815f嘉泰姆 QFN4x4-2415f嘉泰姆	VM15f嘉泰姆	115f嘉泰姆	215f嘉泰姆	2015f嘉泰姆	515f嘉泰姆	2415f嘉泰姆	0.915f嘉泰姆	5</15f嘉泰姆

上一篇：CXSU63117固定工作频率的电流模式控制的的同步降压转换芯片2.5V到5.5V的输入1A的输出1A同步降压DC/DC转换器

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