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：103

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6zs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) 6zs嘉泰姆

The CXSD6273 integrates synchronous buck PWM, linear controller, and 0.8V Reference6zs嘉泰姆
Out Voltage, as well as the monitoring and protection functions into a single package. The 6zs嘉泰姆
fixed 300kHz switching frequency synchro-nous PWM controller drives dual N-channel6zs嘉泰姆
MOSFETs,which provides one controlled power output with over-voltage and over-current6zs嘉泰姆
protections. Linear controller drives an external N-channel MOSFET with under-volt-6zs嘉泰姆
age protection.6zs嘉泰姆
The CXSD6273 provides excellent regulation for output load variation. An internal 0.8V6zs嘉泰姆
temperature-compensated ref-erence voltage is designed to meet the requirement of6zs嘉泰姆
low output voltage applications.6zs嘉泰姆
The CXSD6273 with excellent protection functions: POR,OCP, OVP and UVP. The6zs嘉泰姆
Power-On-Reset (POR) circuit can monitor VCC12 supply voltage exceeds its threshold6zs嘉泰姆
voltage while the controller is running, and a built-in digi-tal soft-start provides both outputs6zs嘉泰姆
with controlled rising voltage. The Over-Current Protection (OCP) monitors the output current6zs嘉泰姆
by using the voltage drop across the lower MOSFET’s RDS(ON), comparing with the voltage6zs嘉泰姆
of OCSET pin, VOCSET. The maximum VOCSET voltage is limited to the internal default value6zs嘉泰姆
0.25V. In addition, when OCSET pin is floating (no ROCSET resistor), the over current threshold6zs嘉泰姆
will also be internal default value, 0.25V. When the output current reaches the trip point, the6zs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 than6zs嘉泰姆
50% of VREF, the controller will shutdown the IC directly.The Over-Voltage Protection (OVP)6zs嘉泰姆
monitors the voltage of FB. When the VFB is over 135% of VREF, the controller will6zs嘉泰姆
make Low-side gate signal fully turn on until the fault events are removed.6zs嘉泰姆
二.产品特点(Features)6zs嘉泰姆

1.)Two Regulated Voltages and REF_OUT Synchronous Buck Converter6zs嘉泰姆
Linear Regulator6zs嘉泰姆
REF_OUT = 0.8V±1% with 3mA Source Current6zs嘉泰姆
2.)Single 12V Power Supply Required6zs嘉泰姆
3.)Excellent Both Output Voltage Regulation6zs嘉泰姆
0.8V Internal Reference6zs嘉泰姆
±1% Over Line Voltage and Temperature6zs嘉泰姆
4.)Integrated Soft-Start for PWM and Linear Outputs6zs嘉泰姆
5.)300KHz Fixed Switching Frequency6zs嘉泰姆
6.)Voltage Mode PWM Control Design and Up to 89%(Typ.) Duty Cycle6zs嘉泰姆
7.)Under-Voltage Protection Monitoring Linear Out-put6zs嘉泰姆
8.)Over-Voltage Protection Monitoring PWM Output6zs嘉泰姆
9.)Over-Current Protection for PWM Output Sense Low-side MOSFET’s RDS(ON)6zs嘉泰姆

10.)SOP-14, SSOP-16 and Compact QFN4x4-16 pack-ages6zs嘉泰姆
11.)Lead Free and Green Devices Available(RoHS Compliant)6zs嘉泰姆
三,应用范围 (Applications)6zs嘉泰姆

Graphic Cards6zs嘉泰姆
四.下载产品资料PDF文档 6zs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！6zs嘉泰姆

QQ截图20160419174301.jpg 6zs嘉泰姆

五,产品封装图 (Package)6zs嘉泰姆
6zs嘉泰姆
FUNCTION NAMEFUNCTION6zs嘉泰姆

PIN NO.6zs嘉泰姆			NAME6zs嘉泰姆	FUNCTION6zs嘉泰姆


SOP-146zs嘉泰姆	SSOP-166zs嘉泰姆	QFN4x4-166zs嘉泰姆
16zs嘉泰姆	156zs嘉泰姆		BOOT6zs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 voltage6zs嘉泰姆 for the upper gate diver (UGATE).6zs嘉泰姆
26zs嘉泰姆	26zs嘉泰姆	166zs嘉泰姆	FS_DIS6zs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 will6zs嘉泰姆 enable both outputs back into regulation.6zs嘉泰姆
36zs嘉泰姆	36zs嘉泰姆	16zs嘉泰姆	COMP6zs嘉泰姆	This pin is the output of PWM error amplifier. It is used to set the compensation components.6zs嘉泰姆
46zs嘉泰姆	46zs嘉泰姆	26zs嘉泰姆	FB6zs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 monitored6zs嘉泰姆 for under-voltage protection, when the FB voltage is under 50% of reference6zs嘉泰姆 voltage (0.4V), both outputs will be shutdowned immediately.6zs嘉泰姆
56zs嘉泰姆	56zs嘉泰姆	36zs嘉泰姆	DRIVE6zs嘉泰姆	This pin drives the gate of an external N-channel MOSFET for linear regulator.6zs嘉泰姆 It is also used to set the compensation for some specific applications, for6zs嘉泰姆 example, with low values of output capacitance and ESR.6zs嘉泰姆
66zs嘉泰姆	66zs嘉泰姆	46zs嘉泰姆	FBL6zs嘉泰姆	This pin is the inverting input of the linear regulator error amplifier. It is used to6zs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.6zs嘉泰姆
76zs嘉泰姆	7,86zs嘉泰姆	5,66zs嘉泰姆	GND6zs嘉泰姆	This pin is the signal ground pin. Connect the GND pin to a good ground plane.6zs嘉泰姆
86zs嘉泰姆	9,106zs嘉泰姆	7,86zs嘉泰姆	VCC126zs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.6zs嘉泰姆
96zs嘉泰姆	116zs嘉泰姆	96zs嘉泰姆	REF_OUT6zs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.6zs嘉泰姆 When VOCSET is above 1V, the REF_OUT buffer will be closed, the VREF_OUT is 0V.6zs嘉泰姆
106zs嘉泰姆	126zs嘉泰姆	106zs嘉泰姆	OCSET6zs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 be6zs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)6zs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.6zs嘉泰姆
116zs嘉泰姆	136zs嘉泰姆	116zs嘉泰姆	LGATE6zs嘉泰姆	This pin is the gate driver for the lower MOSFET of PWM output.6zs嘉泰姆
126zs嘉泰姆	146zs嘉泰姆	126zs嘉泰姆	PGND6zs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.6zs嘉泰姆
136zs嘉泰姆	156zs嘉泰姆	136zs嘉泰姆	PHASE6zs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 lower6zs嘉泰姆 MOSFET for over-current protection.6zs嘉泰姆
146zs嘉泰姆	166zs嘉泰姆	146zs嘉泰姆	UGATE6zs嘉泰姆	This pin is the gate driver for the upper MOSFET of PWM output.6zs嘉泰姆

六.电路原理图6zs嘉泰姆

6zs嘉泰姆

七,功能概述6zs嘉泰姆

Function Description (Cont.)6zs嘉泰姆

Over-Current Protection (Cont.)6zs嘉泰姆
When OCSET PIN is floating, the VOCSET will be pulled high and the over current threshold will be the6zs嘉泰姆

internal default value 0.25V. When the voltage drop across the lower MOSFET’s RDS(ON) is larger than6zs嘉泰姆

0.25V, an over-cur-rent condition is detected, the controller will shutdown the IC directly, and latch 6zs嘉泰姆

the converter’s output. 6zs嘉泰姆
Over Voltage Protection6zs嘉泰姆
The FB pin is monitored during converter operation by its own Over Voltage(OV) comparator. If the6zs嘉泰姆

FB voltage is over 135% of the reference voltage, the controller will make Low-Side gate signal fully 6zs嘉泰姆

turn on until the fault events are removed.6zs嘉泰姆
Under Voltage Protection6zs嘉泰姆
The FBL pin is monitored during converter operation by its own Under Voltage (UV) comparator. If 6zs嘉泰姆

the FBL voltage drop below 50% of the reference voltage (50% of 0.8V =0.4V), a fault signal is 6zs嘉泰姆

internally generated, and the de-vice turns off both high-side and low-side MOSFET and the 6zs嘉泰姆

converter’s output is latched to be floating. The con-troller will shutdown the IC directly.6zs嘉泰姆
Shutdown and Enable6zs嘉泰姆
Pulling low the FS_DIS pin near GND by an open drain transistor or other pull-down device 6zs嘉泰姆

(<1k. impedance)will shutdown both regulators. Upon release of the FS_DIS pin, it will6zs嘉泰姆

enable both outputs back into regulation. In shutdown mode, the UGATE and LGATE6zs嘉泰姆

turn off and pull to PHASE and GND respectively.6zs嘉泰姆

八,相关产品 更多同类产品...... 6zs嘉泰姆

Switching Regulator > Buck Controller6zs嘉泰姆
Part_No 6zs嘉泰姆	Package 6zs嘉泰姆	Archi6zs嘉泰姆 tectu6zs嘉泰姆	Phase6zs嘉泰姆	No.of6zs嘉泰姆 PWM6zs嘉泰姆 Output6zs嘉泰姆	Output 6zs嘉泰姆 Current6zs嘉泰姆 (A) 6zs嘉泰姆	Input6zs嘉泰姆 Voltage (V) 6zs嘉泰姆		Reference6zs嘉泰姆 Voltage6zs嘉泰姆 (V) 6zs嘉泰姆	Bias 6zs嘉泰姆 Voltage6zs嘉泰姆 (V) 6zs嘉泰姆	Quiescent6zs嘉泰姆 Current6zs嘉泰姆 (uA) 6zs嘉泰姆
Part_No 6zs嘉泰姆	Package 6zs嘉泰姆	Archi6zs嘉泰姆 tectu6zs嘉泰姆	Phase6zs嘉泰姆	No.of6zs嘉泰姆 PWM6zs嘉泰姆 Output6zs嘉泰姆	Output 6zs嘉泰姆 Current6zs嘉泰姆 (A) 6zs嘉泰姆	min6zs嘉泰姆	max6zs嘉泰姆	Reference6zs嘉泰姆 Voltage6zs嘉泰姆 (V) 6zs嘉泰姆	Bias 6zs嘉泰姆 Voltage6zs嘉泰姆 (V) 6zs嘉泰姆	Quiescent6zs嘉泰姆 Current6zs嘉泰姆 (uA) 6zs嘉泰姆
CXSD62736zs嘉泰姆	SOP-146zs嘉泰姆 QSOP-166zs嘉泰姆 QFN4x4-166zs嘉泰姆	VM 6zs嘉泰姆	1 6zs嘉泰姆	1 6zs嘉泰姆	306zs嘉泰姆	2.9 6zs嘉泰姆	13.26zs嘉泰姆	0.96zs嘉泰姆	12 6zs嘉泰姆	80006zs嘉泰姆
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CXSD6274C6zs嘉泰姆	SOP-86zs嘉泰姆	VM6zs嘉泰姆	16zs嘉泰姆	16zs嘉泰姆	206zs嘉泰姆	2.96zs嘉泰姆	13.26zs嘉泰姆	0.86zs嘉泰姆	126zs嘉泰姆	50006zs嘉泰姆
CXSD62756zs嘉泰姆	QFN4x4-246zs嘉泰姆	VM6zs嘉泰姆	26zs嘉泰姆	16zs嘉泰姆	606zs嘉泰姆	3.16zs嘉泰姆	13.26zs嘉泰姆	0.66zs嘉泰姆	126zs嘉泰姆	50006zs嘉泰姆
CXSD62766zs嘉泰姆	SOP-86zs嘉泰姆	VM6zs嘉泰姆	16zs嘉泰姆	16zs嘉泰姆	206zs嘉泰姆	2.26zs嘉泰姆	13.26zs嘉泰姆	0.86zs嘉泰姆	5~126zs嘉泰姆	21006zs嘉泰姆
CXSD6276A6zs嘉泰姆	SOP-86zs嘉泰姆	VM6zs嘉泰姆	16zs嘉泰姆	16zs嘉泰姆	206zs嘉泰姆	2.26zs嘉泰姆	13.26zs嘉泰姆	0.86zs嘉泰姆	5~126zs嘉泰姆	21006zs嘉泰姆
CXSD6277/A/B6zs嘉泰姆	SOP8\|TSSOP86zs嘉泰姆	VM6zs嘉泰姆	16zs嘉泰姆	16zs嘉泰姆	56zs嘉泰姆	56zs嘉泰姆	13.26zs嘉泰姆	1.25\|0.86zs嘉泰姆	5~126zs嘉泰姆	30006zs嘉泰姆
CXSD62786zs嘉泰姆	SOP-86zs嘉泰姆	VM6zs嘉泰姆	16zs嘉泰姆	16zs嘉泰姆	106zs嘉泰姆	3.36zs嘉泰姆	5.56zs嘉泰姆	0.86zs嘉泰姆	56zs嘉泰姆	21006zs嘉泰姆
CXSD6279B6zs嘉泰姆	SOP-146zs嘉泰姆	VM 6zs嘉泰姆	16zs嘉泰姆	16zs嘉泰姆	106zs嘉泰姆	56zs嘉泰姆	13.26zs嘉泰姆	0.86zs嘉泰姆	126zs嘉泰姆	20006zs嘉泰姆
CXSD62806zs嘉泰姆	TSSOP-246zs嘉泰姆 \|QFN5x5-326zs嘉泰姆	VM6zs嘉泰姆	16zs嘉泰姆	26zs嘉泰姆	206zs嘉泰姆	56zs嘉泰姆	13.26zs嘉泰姆	0.66zs嘉泰姆	5~126zs嘉泰姆	40006zs嘉泰姆
CXSD6281N6zs嘉泰姆	SOP146zs嘉泰姆 QSOP166zs嘉泰姆 QFN-166zs嘉泰姆	VM6zs嘉泰姆	16zs嘉泰姆	16zs嘉泰姆	306zs嘉泰姆	2.96zs嘉泰姆	13.26zs嘉泰姆	0.96zs嘉泰姆	126zs嘉泰姆	40006zs嘉泰姆
CXSD62826zs嘉泰姆	SOP-146zs嘉泰姆	VM6zs嘉泰姆	16zs嘉泰姆	16zs嘉泰姆	306zs嘉泰姆	2.26zs嘉泰姆	13.26zs嘉泰姆	0.66zs嘉泰姆	126zs嘉泰姆	50006zs嘉泰姆
CXSD6282A6zs嘉泰姆	SOP-146zs嘉泰姆	VM6zs嘉泰姆	16zs嘉泰姆	16zs嘉泰姆	306zs嘉泰姆	2.26zs嘉泰姆	13.26zs嘉泰姆	0.66zs嘉泰姆	126zs嘉泰姆	50006zs嘉泰姆
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CXSD62886zs嘉泰姆	SSOP286zs嘉泰姆 QFN4x4-246zs嘉泰姆	VM6zs嘉泰姆	16zs嘉泰姆	26zs嘉泰姆	206zs嘉泰姆	56zs嘉泰姆	246zs嘉泰姆	0.96zs嘉泰姆	5</6zs嘉泰姆

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