CXSD62100电压模式固定300kHz开关频率同步降压变换器上电复位（POR）电路监测VCC电源电压，以防止错误的逻辑控制。内置的软启动电路可防止输出电压过冲，并限制输入电流

CXSD62100是一种电压模式，固定300kHz开关频率，同步降压变换器。允许宽输入电压为单个5~12V或两个电源电压CXSD62100允许宽输入电压，可以是单个5~12V或两个电源电压，适用于各种应用。上电复位（POR）电路监测VCC电源电压，以防止错误的逻辑控制。内置的软启动电路可防止输出电压过冲，并限制输入电流。为了满足低输出电压应用的要求，设计了一种高精度的0.6V温度补偿参考电压

目录

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)     

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           The CXSD62100 is a voltage mode, fixed 300kHz witching frequency, synchronous buck converter. The CXSD62100 allows wide input voltage that is either a single 5~12V or two supply voltage(s) for various applications. A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent wrong logic controls. A built-in soft-start circuit prevents the output voltages from overshoot as well as limits the input current. An internal 0.6V temperature-com-pensated reference voltage with high accuracy is de-signed to meet the requirement of low output voltage applications. The CXSD62100 provides excellent output volt-age regulations against load current variation. CXSD62100 is built in remote sense function for applications that re-quire remote sense. (TDFN-10 3mmx3mm Package Only)The controller’s over-current protection monitors the out-put current by using the voltage drop across the RDS (ON) of low-side MOSFET, eliminating the need for a cur-rent sensing resistor that features high efficiency and low cost. In addition, the CXSD62100 also integrates excel-lent protection functions. The over-voltage protection (OVP) , under-voltage protection (UVP). OVP circuit which moni-tors the FB voltage to prevent the PWM output from over voltage, and UVP circuit which monitors the FB voltage to prevent the PWM output from under voltage or short circuit.
       The CXSD62100 is available in TDFN3x3-10 packages
二.产品特点(Features)

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1.）Wide 5V to 12V Supply Voltage
2.）Power-On-Reset Monitoring on VCC
3.）Excellent Output Voltage Regulations
      - 0.6V Internal Reference
      - ±0.6% Over-Temperature Range
4.）Integrated Soft-Start
5.）Voltage Mode PWM Operation with External Compensation
6.）Up to 90% Duty Ratio for Fast Transient Response
7.）Constant Switching Frequency - 300kHz ±10%
8.）Integrated Bootstrap Forward P-CH MOSFET
9.）50% Under-Voltage Protection
10.）125% Over-Voltage Protection
11.）Adjustable Over-Current Protection Threshold
      - Using the RDS(ON) of Low-Side MOSFET
12.）Shutdown Control by COMP
13.）Power Good Monitoring (TDFN-10 3mmx3mm Package Only)
14.）Remote Feedback Sense for Excellent Output
15.）Voltage (TDFN-10 3mmx3mm Package Only) TDFN3x3-10 Package
16.）Lead Free and Green Devices Available
三,应用范围 (Applications)

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Graphic Cards
DSL, Switch HUB
Wireless Lan
Notebook Computer
Mother Board
LCD Monitor/TV
四.下载产品资料PDF文档 

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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！

 

五,产品封装图 (Package)

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六.电路原理图

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七,功能概述

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Layout Consideration
In any high switching frequency converter, a correct lay-out is important to ensure proper operation of the
regulator. With power devices switching at 300kHz,the resulting current transient will cause voltage spike across
the interconnecting impedance and parasitic circuit elements. As an example, consider the turn-off transition
of the PWM MOSFET. Before turn-off, the MOSFET is car-rying the full load current. During turn-off, current stops
flowing in the MOSFET and is free-wheeling by the lower MOSFET and parasitic diode. Any parasitic inductance of
the circuit generates a large voltage spike during the switching interval. In general, using short and wide printed
circuit traces should minimize interconnecting imped ances and the magnitude of voltage spike. And signal
and power grounds are to be kept separate till combined using ground plane construction or single point
grounding. Figure 8. illustrates the layout, with bold lines indicating high current paths; these traces must be short
and wide. Components along the bold lines should be placed lose together. Below is a checklist for your layout:
- Keep the switching nodes (UGATE, LGATE, and PHASE)away from sensitive small signal nodes since these
nodes are fast moving signals. Therefore, keep traces to these nodes as short as possible.
- The traces from the gate drivers to the MOSFETs (UG and LG) should be short and wide.
- Place the source of the high-side MOSFET and the drain of the low-side MOSFET as close as possible. Minimiz-
ing the impedance with wide layout plane between the two pads reduces the voltage bounce of the node.
- Decoupling capacitor, compensation component, the resistor dividers, and boot capacitors should be close
their pins. (For example, place the decoupling ceramiccapacitor near the drain of the high-side MOSFET as
close as possible. The bulk capacitors are also placed near the drain).
- The input capacitor should be near the drain of the up-per MOSFET; the output capacitor should be near the
loads. The input capacitor GND should be close to the output capacitor GND and the lower MOSFET GND.
 The drain of the MOSFETs (VIN and PHASE nodes) should be a large plane for heat sinking.
- The ROCSET resistance should be placed near the IC as close as possible.

八,相关产品                   更多同类产品...... 

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Switching Regulator >   Buck Controller
Part_No	Package	Archi tectu	Phase	No.of PWM Output	Output  Current (A)	Input Voltage (V)		Reference Voltage (V)	Bias  Voltage (V)	Quiescent Current (uA)
						min	max
CXSD6273	SOP-14 QSOP-16 QFN4x4-16	VM	1	1	30	2.9	13.2	0.9	12	8000
CXSD6274	SOP-8	VM	1	1	20	2.9	13.2	0.8	12	5000
CXSD6274C	SOP-8	VM	1	1	20	2.9	13.2	0.8	12	5000
CXSD6275	QFN4x4-24	VM	2	1	60	3.1	13.2	0.6	12	5000
CXSD6276	SOP-8	VM	1	1	20	2.2	13.2	0.8	5~12	2100
CXSD6276A	SOP-8	VM	1	1	20	2.2	13.2	0.8	5~12	2100
CXSD6277/A/B	SOP8|TSSOP8	VM	1	1	5	5	13.2	1.25|0.8	5~12	3000
CXSD6278	SOP-8	VM	1	1	10	3.3	5.5	0.8	5	2100
CXSD6279B	SOP-14	VM	1	1	10	5	13.2	0.8	12	2000
CXSD6280	TSSOP-24 |QFN5x5-32	VM	1	2	20	5	13.2	0.6	5~12	4000
CXSD6281N	SOP14 QSOP16 QFN-16	VM	1	1	30	2.9	13.2	0.9	12	4000
CXSD6282	SOP-14	VM	1	1	30	2.2	13.2	0.6	12	5000
CXSD6282A	SOP-14	VM	1	1	30	2.2	13.2	0.6	12	5000
CXSD6283	SOP-14	VM	1	1	25	2.2	13.2	0.8	12	5000
CXSD6284/A	LQFP7x7 48 TQFN7x7-48	VM	1	6	0.015	1.4	6.5	-	5	1800
CXSD6285	TSSOP-24P	VM	1	2	20	2.97	5.5	0.8	5~12	5000
CXSD6286	SOP-14	VM	1	1	10	5	13.2	0.8	12	3000
CXSD6287	SOP-8-P|DIP-8	VM	1	1	30	2.9	13.2	1.2	12	3000
CXSD6288	SSOP28 QFN4x4-24	VM	1	2	20	5	24	0.9	5	1200
CXSD6289	SOP-20	VM	1	2	20	2.2	13.2	0.6	5~12	4000
CXSD6290	SOP8|DFN3x3-10	VM	1	2	-	-	-	-	5~12	550
CXSD6291HC	DIP8|SOP-8	VM	1	1	1	1.2	9	24	5	9 ~ 24
CXSD6292	SSOP16 QFN4x4-16 TQFN3x3-16	VM	1	1	25	3	25	0.6	5	1700
CXSD6293	TDFN3x3-10	COT	1	1	25	3	25	0.5	5	350
CXSD6294	QFN4x4-24	CM	2	1	40	4.5	13.2	0.6	5~12	4000
CXSD6295	SOP8P TDFN3x3-10	VM	1	1	20	3	13.2	0.8	5~12	2500
CXSD6296A|B|C|D	SOP8P	VM	1	1	25	3	13.2	0.6|0.8	5~12	1200
CXSD6297	TDFN3x3-10	VM	1	1	25	4	13.2	0.8	5~12	2000
CXSD6298	TDFN3x3-10	COT	1	1	25	4.5	25	0.6	5~12	80
CXSD6299|A	SOP-8P	VM	1	1	25	4.5	13.2	0.8	5~12	16000
CXSD62100	TQFN3x3-10	VM	1	1	25	4.5	13.2	0.6	5~12	2500
CXSD62101|L	TDFN3x3-10	COT	1	1	30	3	25	0.8	5~12	2000
CXSD62102	TQFN3x3-16	COT	1	1	30	1.8	28	0.6	5	600
CXSD62102A	TQFN 3x3 16	COT	1	1	30	1.8	28	0.6	5	600
CXSD62103	QFN4x4-24	VM	2	1	50	4.5	13.2	0.6	5~12	5000
CXSD62104	TQFN4x4-24	COT	1	2	15	6	25	2	N	550
CXSD62105	TQFN4x4-24	COT	1	2	15	6	25	2	N	550
CXSD62106|A	TQFN4x4-4 TQFN3x3-20	COT	1	2	20	3	28	0.75	5	800
CXSD62107	TQFN3x3-16	COT	1	1	20	1.8	28	0.75	5	400
CXSD62108	QFN3.5x3.5-14 TQFN3x3-16	COT	1	1	20	1.8	28	0.75	5	400
CXSD62109	TQFN3x3-16	COT	1	2	20	1.8	28	0.75	5	400
CXSD62110	QFN3x3-20 TQFN3x3-16	COT	1	2	20	3	28	1.8|1.5|0.5	5	740
CXSD62111	TQFN4x4-24 |QFN3x3-20	CM	1	2	15	5	28	0.5	N	3000
CXSD62112	TDFN3x3-10	COT	1	1	20	1.8	28	0.5	5	250
CXSD62113|C	TQFN3x3-20	COT	1	2	15	6	25	2	N	550
CXSD62113E	TQFN 3x3 20	COT	2	2	11	6	25	2	N	550
CXSD62114	TQFN3x3-20	COT	2	2	11	5.5	25	2	N	280
CXSD62115	QFN4x4-24	VM	2	1	60	3.1	13.2	0.85	12	5000
CXSD62116A|B|C	SOP-8P	VM	1	1	20	2.9	13.2	0.8	12	16000
CXSD62117	SOP-20	VM	2	2	30	10	13.2	1	12	5000
CXSD62118	TDFN3x3-10	COT	1	1	25	1.8	28	0.7	5	250
CXSD62119	TQFN3x3-20	COT	2	1	40	1.8	25	REFIN Setting	5	700
CXSD62120	QFN 3x3 20 TQFN 3x3 16	COT	1	2	20	3	28	1.8|1.5 1.35|1.2 0.5	5	800
CXSD62121A	TQFN3x3 20	COT	1	2	15	3	28	0.75	5	220
CXSD62121B	TQFN3x3 20	COT	1	2	15	3	28	0.75	5	220
CXSD62121	TQFN3x3-20	COT	1	2	20	3	28	0.75	5	180