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：366

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wIj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) wIj嘉泰姆

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

1.)Two Regulated Voltages and REF_OUT Synchronous Buck ConverterwIj嘉泰姆
Linear RegulatorwIj嘉泰姆
REF_OUT = 0.8V±1% with 3mA Source CurrentwIj嘉泰姆
2.)Single 12V Power Supply RequiredwIj嘉泰姆
3.)Excellent Both Output Voltage RegulationwIj嘉泰姆
0.8V Internal ReferencewIj嘉泰姆
±1% Over Line Voltage and TemperaturewIj嘉泰姆
4.)Integrated Soft-Start for PWM and Linear OutputswIj嘉泰姆
5.)300KHz Fixed Switching FrequencywIj嘉泰姆
6.)Voltage Mode PWM Control Design and Up to 89%(Typ.) Duty CyclewIj嘉泰姆
7.)Under-Voltage Protection Monitoring Linear Out-putwIj嘉泰姆
8.)Over-Voltage Protection Monitoring PWM OutputwIj嘉泰姆
9.)Over-Current Protection for PWM Output Sense Low-side MOSFET’s RDS(ON)wIj嘉泰姆

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

Graphic CardswIj嘉泰姆
四.下载产品资料PDF文档 wIj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！wIj嘉泰姆

QQ截图20160419174301.jpg wIj嘉泰姆

五,产品封装图 (Package)wIj嘉泰姆
wIj嘉泰姆
FUNCTION NAMEFUNCTIONwIj嘉泰姆

PIN NO.wIj嘉泰姆			NAMEwIj嘉泰姆	FUNCTIONwIj嘉泰姆


SOP-14wIj嘉泰姆	SSOP-16wIj嘉泰姆	QFN4x4-16wIj嘉泰姆
1wIj嘉泰姆	15wIj嘉泰姆		BOOTwIj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 voltagewIj嘉泰姆 for the upper gate diver (UGATE).wIj嘉泰姆
2wIj嘉泰姆	2wIj嘉泰姆	16wIj嘉泰姆	FS_DISwIj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 willwIj嘉泰姆 enable both outputs back into regulation.wIj嘉泰姆
3wIj嘉泰姆	3wIj嘉泰姆	1wIj嘉泰姆	COMPwIj嘉泰姆	This pin is the output of PWM error amplifier. It is used to set the compensation components.wIj嘉泰姆
4wIj嘉泰姆	4wIj嘉泰姆	2wIj嘉泰姆	FBwIj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 monitoredwIj嘉泰姆 for under-voltage protection, when the FB voltage is under 50% of referencewIj嘉泰姆 voltage (0.4V), both outputs will be shutdowned immediately.wIj嘉泰姆
5wIj嘉泰姆	5wIj嘉泰姆	3wIj嘉泰姆	DRIVEwIj嘉泰姆	This pin drives the gate of an external N-channel MOSFET for linear regulator.wIj嘉泰姆 It is also used to set the compensation for some specific applications, forwIj嘉泰姆 example, with low values of output capacitance and ESR.wIj嘉泰姆
6wIj嘉泰姆	6wIj嘉泰姆	4wIj嘉泰姆	FBLwIj嘉泰姆	This pin is the inverting input of the linear regulator error amplifier. It is used towIj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.wIj嘉泰姆
7wIj嘉泰姆	7,8wIj嘉泰姆	5,6wIj嘉泰姆	GNDwIj嘉泰姆	This pin is the signal ground pin. Connect the GND pin to a good ground plane.wIj嘉泰姆
8wIj嘉泰姆	9,10wIj嘉泰姆	7,8wIj嘉泰姆	VCC12wIj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.wIj嘉泰姆
9wIj嘉泰姆	11wIj嘉泰姆	9wIj嘉泰姆	REF_OUTwIj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.wIj嘉泰姆 When VOCSET is above 1V, the REF_OUT buffer will be closed, the VREF_OUT is 0V.wIj嘉泰姆
10wIj嘉泰姆	12wIj嘉泰姆	10wIj嘉泰姆	OCSETwIj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 bewIj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)wIj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.wIj嘉泰姆
11wIj嘉泰姆	13wIj嘉泰姆	11wIj嘉泰姆	LGATEwIj嘉泰姆	This pin is the gate driver for the lower MOSFET of PWM output.wIj嘉泰姆
12wIj嘉泰姆	14wIj嘉泰姆	12wIj嘉泰姆	PGNDwIj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.wIj嘉泰姆
13wIj嘉泰姆	15wIj嘉泰姆	13wIj嘉泰姆	PHASEwIj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 lowerwIj嘉泰姆 MOSFET for over-current protection.wIj嘉泰姆
14wIj嘉泰姆	16wIj嘉泰姆	14wIj嘉泰姆	UGATEwIj嘉泰姆	This pin is the gate driver for the upper MOSFET of PWM output.wIj嘉泰姆

六.电路原理图wIj嘉泰姆

wIj嘉泰姆

七,功能概述wIj嘉泰姆

Function Description (Cont.)wIj嘉泰姆

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

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

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

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

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

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

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

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

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

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

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

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

八,相关产品 更多同类产品...... wIj嘉泰姆

Switching Regulator > Buck ControllerwIj嘉泰姆
Part_No wIj嘉泰姆	Package wIj嘉泰姆	ArchiwIj嘉泰姆 tectuwIj嘉泰姆	PhasewIj嘉泰姆	No.ofwIj嘉泰姆 PWMwIj嘉泰姆 OutputwIj嘉泰姆	Output wIj嘉泰姆 CurrentwIj嘉泰姆 (A) wIj嘉泰姆	InputwIj嘉泰姆 Voltage (V) wIj嘉泰姆		ReferencewIj嘉泰姆 VoltagewIj嘉泰姆 (V) wIj嘉泰姆	Bias wIj嘉泰姆 VoltagewIj嘉泰姆 (V) wIj嘉泰姆	QuiescentwIj嘉泰姆 CurrentwIj嘉泰姆 (uA) wIj嘉泰姆
Part_No wIj嘉泰姆	Package wIj嘉泰姆	ArchiwIj嘉泰姆 tectuwIj嘉泰姆	PhasewIj嘉泰姆	No.ofwIj嘉泰姆 PWMwIj嘉泰姆 OutputwIj嘉泰姆	Output wIj嘉泰姆 CurrentwIj嘉泰姆 (A) wIj嘉泰姆	minwIj嘉泰姆	maxwIj嘉泰姆	ReferencewIj嘉泰姆 VoltagewIj嘉泰姆 (V) wIj嘉泰姆	Bias wIj嘉泰姆 VoltagewIj嘉泰姆 (V) wIj嘉泰姆	QuiescentwIj嘉泰姆 CurrentwIj嘉泰姆 (uA) wIj嘉泰姆
CXSD6273wIj嘉泰姆	SOP-14wIj嘉泰姆 QSOP-16wIj嘉泰姆 QFN4x4-16wIj嘉泰姆	VM wIj嘉泰姆	1 wIj嘉泰姆	1 wIj嘉泰姆	30wIj嘉泰姆	2.9 wIj嘉泰姆	13.2wIj嘉泰姆	0.9wIj嘉泰姆	12 wIj嘉泰姆	8000wIj嘉泰姆
CXSD6274wIj嘉泰姆	SOP-8wIj嘉泰姆	VM wIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	20wIj嘉泰姆	2.9 wIj嘉泰姆	13.2 wIj嘉泰姆	0.8wIj嘉泰姆	12wIj嘉泰姆	5000wIj嘉泰姆
CXSD6274CwIj嘉泰姆	SOP-8wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	20wIj嘉泰姆	2.9wIj嘉泰姆	13.2wIj嘉泰姆	0.8wIj嘉泰姆	12wIj嘉泰姆	5000wIj嘉泰姆
CXSD6275wIj嘉泰姆	QFN4x4-24wIj嘉泰姆	VMwIj嘉泰姆	2wIj嘉泰姆	1wIj嘉泰姆	60wIj嘉泰姆	3.1wIj嘉泰姆	13.2wIj嘉泰姆	0.6wIj嘉泰姆	12wIj嘉泰姆	5000wIj嘉泰姆
CXSD6276wIj嘉泰姆	SOP-8wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	20wIj嘉泰姆	2.2wIj嘉泰姆	13.2wIj嘉泰姆	0.8wIj嘉泰姆	5~12wIj嘉泰姆	2100wIj嘉泰姆
CXSD6276AwIj嘉泰姆	SOP-8wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	20wIj嘉泰姆	2.2wIj嘉泰姆	13.2wIj嘉泰姆	0.8wIj嘉泰姆	5~12wIj嘉泰姆	2100wIj嘉泰姆
CXSD6277/A/BwIj嘉泰姆	SOP8\|TSSOP8wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	5wIj嘉泰姆	5wIj嘉泰姆	13.2wIj嘉泰姆	1.25\|0.8wIj嘉泰姆	5~12wIj嘉泰姆	3000wIj嘉泰姆
CXSD6278wIj嘉泰姆	SOP-8wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	10wIj嘉泰姆	3.3wIj嘉泰姆	5.5wIj嘉泰姆	0.8wIj嘉泰姆	5wIj嘉泰姆	2100wIj嘉泰姆
CXSD6279BwIj嘉泰姆	SOP-14wIj嘉泰姆	VM wIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	10wIj嘉泰姆	5wIj嘉泰姆	13.2wIj嘉泰姆	0.8wIj嘉泰姆	12wIj嘉泰姆	2000wIj嘉泰姆
CXSD6280wIj嘉泰姆	TSSOP-24wIj嘉泰姆 \|QFN5x5-32wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	2wIj嘉泰姆	20wIj嘉泰姆	5wIj嘉泰姆	13.2wIj嘉泰姆	0.6wIj嘉泰姆	5~12wIj嘉泰姆	4000wIj嘉泰姆
CXSD6281NwIj嘉泰姆	SOP14wIj嘉泰姆 QSOP16wIj嘉泰姆 QFN-16wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	30wIj嘉泰姆	2.9wIj嘉泰姆	13.2wIj嘉泰姆	0.9wIj嘉泰姆	12wIj嘉泰姆	4000wIj嘉泰姆
CXSD6282wIj嘉泰姆	SOP-14wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	30wIj嘉泰姆	2.2wIj嘉泰姆	13.2wIj嘉泰姆	0.6wIj嘉泰姆	12wIj嘉泰姆	5000wIj嘉泰姆
CXSD6282AwIj嘉泰姆	SOP-14wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	30wIj嘉泰姆	2.2wIj嘉泰姆	13.2wIj嘉泰姆	0.6wIj嘉泰姆	12wIj嘉泰姆	5000wIj嘉泰姆
CXSD6283wIj嘉泰姆	SOP-14wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	25wIj嘉泰姆	2.2wIj嘉泰姆	13.2wIj嘉泰姆	0.8wIj嘉泰姆	12wIj嘉泰姆	5000wIj嘉泰姆
CXSD6284/AwIj嘉泰姆	LQFP7x7 48wIj嘉泰姆 TQFN7x7-48wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	6wIj嘉泰姆	0.015wIj嘉泰姆	1.4wIj嘉泰姆	6.5wIj嘉泰姆	-wIj嘉泰姆	5wIj嘉泰姆	1800wIj嘉泰姆
CXSD6285wIj嘉泰姆	TSSOP-24PwIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	2wIj嘉泰姆	20wIj嘉泰姆	2.97wIj嘉泰姆	5.5wIj嘉泰姆	0.8wIj嘉泰姆	5~12wIj嘉泰姆	5000wIj嘉泰姆
CXSD6286wIj嘉泰姆	SOP-14wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	10wIj嘉泰姆	5wIj嘉泰姆	13.2wIj嘉泰姆	0.8wIj嘉泰姆	12wIj嘉泰姆	3000wIj嘉泰姆
CXSD6287wIj嘉泰姆	SOP-8-P\|DIP-8wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	1wIj嘉泰姆	30wIj嘉泰姆	2.9wIj嘉泰姆	13.2wIj嘉泰姆	1.2wIj嘉泰姆	12wIj嘉泰姆	3000wIj嘉泰姆
CXSD6288wIj嘉泰姆	SSOP28wIj嘉泰姆 QFN4x4-24wIj嘉泰姆	VMwIj嘉泰姆	1wIj嘉泰姆	2wIj嘉泰姆	20wIj嘉泰姆	5wIj嘉泰姆	24wIj嘉泰姆	0.9wIj嘉泰姆	5</wIj嘉泰姆

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