CXSD62104双降压恒时同步的PWM控制器两个低损耗稳压器PWM1和PWM2的输出可以从2V调整到5.5V

发表时间：2020-04-22浏览次数：10

目录bwb嘉泰姆

1.产品概述         2.产品特点bwb嘉泰姆
3.应用范围       4.下载产品资料PDF文档 bwb嘉泰姆
5.产品封装图                     6.电路原理图             bwb嘉泰姆
7.功能概述       8.相关产品bwb嘉泰姆

一,产品概述(General Description) bwb嘉泰姆

The CXSD62104 integrates dual step-down, constant-ontime, synchronousbwb嘉泰姆

PWM controllers (that drives dual N-channel MOSFETs for each channel) andbwb嘉泰姆
two low drop-out regulators as well as various protections into a chip.The PWMbwb嘉泰姆
controllers step down high voltage of a battery to generate low-voltage for NBbwb嘉泰姆
applications. The output of PWM1 and PWM2 can be adjusted from 2V to 5.5Vbwb嘉泰姆
by setting a resistive voltage-divider from VOUTx to GND.The linear regulatorsbwb嘉泰姆
provide 5V and 3.3V output for standby power supply. The linear regulatorsbwb嘉泰姆

provide up to 100mA output current. When the PWMx output voltage is higher bwb嘉泰姆

than LDOx bypass threshold, the related LDOx regulator is shut off and its bwb嘉泰姆

output is connected to VOUTx by internal switchover MOSFET. It can save power dissipation.bwb嘉泰姆
The CXSD62104 provides excellent transient response and accurate DC bwb嘉泰姆

output voltage in either PFM or PWM Mode.In Pulse-Frequency Mode (PFM), bwb嘉泰姆

the CXSD62104 provides very high efficiency over light to heavy loads with bwb嘉泰姆

loading-modulated switching frequencies. The Forced-PWM mode works nearly bwb嘉泰姆

at constant frequency for low-noise requirements. The unique ultrasonic modebwb嘉泰姆

maintains the switching frequency above 25KHz, which eliminates noise in audio applications.bwb嘉泰姆

The CXSD62104 is equipped with accurate sourcing cur-rent-limit, outputbwb嘉泰姆

under-voltage and output over-voltage protections, being perfect for NB bwb嘉泰姆

applications. A 1.7ms (typ.) digital soft-start can reduce the start-up current. bwb嘉泰姆

A soft-stop function actively discharges the output capaci-tors by the discharge bwb嘉泰姆

device. The CXSD62104 has individual enable controls for PWM channels and bwb嘉泰姆

LDOs. Pulling both ENPWM pin and ENLDO pin low shuts down the whole chipbwb嘉泰姆

with low quiescent current close to zero.bwb嘉泰姆
The CXSD62104 is available in a TQFN4x4-24A package.bwb嘉泰姆
二.产品特点(Features)bwb嘉泰姆
Wide Input Voltage Range from 6V to 25Vbwb嘉泰姆
Provide 4 Independent Outputs with ±1.5% Accu-bwb嘉泰姆
racy Over-Temperaturebwb嘉泰姆
- PWM1 Controller with Adjustable (2V to 5.5V) Out-putbwb嘉泰姆
PWM2 Controller with Adjustable (2V to 5.5V) Out-putbwb嘉泰姆
100mA Low Dropout Regulator (LDO5) with Fixed 5V Outputbwb嘉泰姆
100mA Low Dropout Regulator (LDO3) with Fixed 3.3V Outputbwb嘉泰姆
Excellent Line/Load Regulations about ±1.5% Over-Temperature Rangebwb嘉泰姆
±1%, (±1.5%, 50μA) 2.0V Reference Voltage Outputbwb嘉泰姆
Built-In POR Control Scheme Implementedbwb嘉泰姆
Selectable Forced-PWM or Automatic PFM/PWMbwb嘉泰姆
(with Selectable Ultrasonic Operation)bwb嘉泰姆
Constant-On-Time Control Scheme with Frequencybwb嘉泰姆
Compensation for PWM Modebwb嘉泰姆
Selectable Switching Frequency in PWM Modebwb嘉泰姆
Built-in Digital Soft-Start for PWM Outputs and Soft-bwb嘉泰姆
Stop for PWM Outputs and LDO Outputsbwb嘉泰姆
Integrated Bootstrap Forward P-CH MOSFETbwb嘉泰姆
High Efficiency over Light to Full Load Range (PWMs)bwb嘉泰姆
Built-in Power Good Indicators (PWMs)bwb嘉泰姆
Independent Enable Inputs (PWMs, LDO)bwb嘉泰姆

70% Under-Voltage and 125% Over-Voltage Protec-tions (PWM)bwb嘉泰姆

Adjustable Current-Limit Protection (PWMs)bwb嘉泰姆
- Using Sense Low-Side MOSFET’s RDS(ON)bwb嘉泰姆
Over-Temperature Protectionbwb嘉泰姆
4mmx4mm Thin QFN-24 (TQFN4x4-24A) packagebwb嘉泰姆
Lead Free and Green Device Available (RoHS Compliant)bwb嘉泰姆

三,应用范围 (Applications)bwb嘉泰姆

Notebook and Sub-Notebook Computersbwb嘉泰姆

Portable Devicesbwb嘉泰姆
DDR1, DDR2, and DDR3 Power Suppliesbwb嘉泰姆
3-Cell and 4-Cell Li+ Battery-Powered Devicesbwb嘉泰姆
Graphic Cardsbwb嘉泰姆
Game Consolesbwb嘉泰姆
Telecommunicationsbwb嘉泰姆

四.下载产品资料PDF文档 bwb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！bwb嘉泰姆

QQ截图20160419174301.jpg bwb嘉泰姆

五,产品封装图 (Package)bwb嘉泰姆

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六.电路原理图bwb嘉泰姆

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七,功能概述bwb嘉泰姆

Input Capacitor Selectionbwb嘉泰姆
The input capacitor is chosen based on the voltage rating and the RMS current rating. For reliable operation, selectbwb嘉泰姆
the capacitor voltage rating to be at least 1.3 times higher than the maximum input voltage. The maximum RMSbwb嘉泰姆
current rating requirement is approximately IOUT/2, where IOUT is the load current. During power up, the input capaci-tors have to handle large amount of surge current. In low-duty notebook appliactions, ceramic capacitors arebwb嘉泰姆
remmended. The capacitors must be connected between the drain of high-side MOSFET and the source of low-bwb嘉泰姆
side MOSFET with very low-impeadance PCB layout. bwb嘉泰姆
MOSFET Selectionbwb嘉泰姆
The application for a notebook battery with a maximum volt-age of 24V, at least a minimum 30V MOSFETs shouldbwb嘉泰姆
be used. The design has to trade off the gate charge with the RDS(ON) of the MOSFET:bwb嘉泰姆
· For the low-side MOSFET, before it is turned on, the body diode has been conducted. The low-side MOSFETbwb嘉泰姆
driver will not charge the miller capacitor of this MOSFET.bwb嘉泰姆
In the turning off process of the low-side MOSFET,the load current will shift to the body diode first. Thebwb嘉泰姆
high dv/dt of the phase node voltage will charge the miller capacitor through the low-side MOSFET driverbwb嘉泰姆
sinking current path. This results in much less switching loss of the low-side MOSFETs. The dutybwb嘉泰姆
cycle is often very small in high battery voltage applications, and the low-side MOSFET will con-bwb嘉泰姆
duct most of the switching cycle; therefore, the less the RDS(ON) of the low-side MOSFET, the less the powerbwb嘉泰姆
loss. The gate charge for this MOSFET is usually a secondary consideration. The high-side MOSFETbwb嘉泰姆
does not have this zero voltage switching condition, and because it conducts for less timebwb嘉泰姆
compared to the low-side MOSFET, the switching loss tends to be dominant. Priority should be givenbwb嘉泰姆
to the MOSFETs with less gate charge, so that both the gate driver loss and switching loss will be minimized.bwb嘉泰姆
The selection of the N-channel power MOSFETs are de-termined by the RDS(ON), reversing transfer capacitancebwb嘉泰姆
(CRSS) and maximum output current requirement. The losses in the MOSFETs have two components: conduc-bwb嘉泰姆
tion loss and transition loss. For the high-side and low-side MOSFETs, the losses are approximately given bybwb嘉泰姆
the following equations:bwb嘉泰姆
Layout Considerationbwb嘉泰姆
In any high switching frequency converter, a correct layout is important to ensure proper operation of the regulator.bwb嘉泰姆
With power devices switching at higher frequency, the resulting current transient will cause voltage spike acrossbwb嘉泰姆
the interconnecting impedance and parasitic circuit elements. As an example, consider the turn-off transitionbwb嘉泰姆
of the PWM MOSFET. Before turn-off condition, the MOSFET is carrying the full load current. During turn-off,bwb嘉泰姆
current stops flowing in the MOSFET and is freewheeling by the lower MOSFET and parasitic diode. Any parasiticbwb嘉泰姆
inductance of the circuit generates a large voltage spike during the switching interval. In general, using short andbwb嘉泰姆
wide printed circuit traces should minimize interconnect-ing impedances and the magnitude of voltage spike. Andbwb嘉泰姆
signal and power grounds are to be kept separating and finally combined to use the ground plane construction orbwb嘉泰姆

single point grounding. The best tie-point between the signal ground and the power ground is at the negativebwb嘉泰姆
side of the output capacitor on each channel, where there is less noise. Noisy traces beneath the IC are notbwb嘉泰姆
recommended. Below is a checklist for your layout:bwb嘉泰姆
Layout Consideration (Cont.)bwb嘉泰姆
Keep the switching nodes (UGATEx, LGATEx, BOOTx,and PHASEx) away from sensitive small signal nodesbwb嘉泰姆
(REF, ILIMx, and FBx) since these nodes are fast mov-ing signals. Therefore, keep traces to these nodes asbwb嘉泰姆
short as possible and there should be no other weak signal traces in parallel with theses traces on any layer.bwb嘉泰姆

Minimizing the impedance with wide layout plane be-tween the two pads reduces the voltage bounce ofbwb嘉泰姆

CXSD62104bwb嘉泰姆

八,相关产品 更多同类产品...... bwb嘉泰姆

Switching Regulator > Buck Controllerbwb嘉泰姆
Part_No bwb嘉泰姆	Package bwb嘉泰姆	Archibwb嘉泰姆 tectubwb嘉泰姆	Phasebwb嘉泰姆	No.ofbwb嘉泰姆 PWMbwb嘉泰姆 Outputbwb嘉泰姆	Output bwb嘉泰姆 Currentbwb嘉泰姆 (A) bwb嘉泰姆	Inputbwb嘉泰姆 Voltage (V) bwb嘉泰姆		Referencebwb嘉泰姆 Voltagebwb嘉泰姆 (V) bwb嘉泰姆	Bias bwb嘉泰姆 Voltagebwb嘉泰姆 (V) bwb嘉泰姆	Quiescentbwb嘉泰姆 Currentbwb嘉泰姆 (uA) bwb嘉泰姆
Part_No bwb嘉泰姆	Package bwb嘉泰姆	Archibwb嘉泰姆 tectubwb嘉泰姆	Phasebwb嘉泰姆	No.ofbwb嘉泰姆 PWMbwb嘉泰姆 Outputbwb嘉泰姆	Output bwb嘉泰姆 Currentbwb嘉泰姆 (A) bwb嘉泰姆	minbwb嘉泰姆	maxbwb嘉泰姆	Referencebwb嘉泰姆 Voltagebwb嘉泰姆 (V) bwb嘉泰姆	Bias bwb嘉泰姆 Voltagebwb嘉泰姆 (V) bwb嘉泰姆	Quiescentbwb嘉泰姆 Currentbwb嘉泰姆 (uA) bwb嘉泰姆
CXSD6273bwb嘉泰姆	SOP-14bwb嘉泰姆 QSOP-16bwb嘉泰姆 QFN4x4-16bwb嘉泰姆	VM bwb嘉泰姆	1 bwb嘉泰姆	1 bwb嘉泰姆	30bwb嘉泰姆	2.9 bwb嘉泰姆	13.2bwb嘉泰姆	0.9bwb嘉泰姆	12 bwb嘉泰姆	8000bwb嘉泰姆
CXSD6274bwb嘉泰姆	SOP-8bwb嘉泰姆	VM bwb嘉泰姆	1bwb嘉泰姆	1bwb嘉泰姆	20bwb嘉泰姆	2.9 bwb嘉泰姆	13.2 bwb嘉泰姆	0.8bwb嘉泰姆	12bwb嘉泰姆	5000bwb嘉泰姆
CXSD6274Cbwb嘉泰姆	SOP-8bwb嘉泰姆	VMbwb嘉泰姆	1bwb嘉泰姆	1bwb嘉泰姆	20bwb嘉泰姆	2.9bwb嘉泰姆	13.2bwb嘉泰姆	0.8bwb嘉泰姆	12bwb嘉泰姆	5000bwb嘉泰姆
CXSD6275bwb嘉泰姆	QFN4x4-24bwb嘉泰姆	VMbwb嘉泰姆	2bwb嘉泰姆	1bwb嘉泰姆	60bwb嘉泰姆	3.1bwb嘉泰姆	13.2bwb嘉泰姆	0.6bwb嘉泰姆	12bwb嘉泰姆	5000bwb嘉泰姆
CXSD6276bwb嘉泰姆	SOP-8bwb嘉泰姆	VMbwb嘉泰姆	1bwb嘉泰姆	1bwb嘉泰姆	20bwb嘉泰姆	2.2bwb嘉泰姆	13.2bwb嘉泰姆	0.8bwb嘉泰姆	5~12bwb嘉泰姆	2100bwb嘉泰姆
CXSD6276Abwb嘉泰姆	SOP-8bwb嘉泰姆	VMbwb嘉泰姆	1bwb嘉泰姆	1bwb嘉泰姆	20bwb嘉泰姆	2.2bwb嘉泰姆	13.2bwb嘉泰姆	0.8bwb嘉泰姆	5~12bwb嘉泰姆	2100bwb嘉泰姆
CXSD6277/A/Bbwb嘉泰姆	SOP8\|TSSOP8bwb嘉泰姆	VMbwb嘉泰姆	1bwb嘉泰姆	1bwb嘉泰姆	5bwb嘉泰姆	5bwb嘉泰姆	13.2bwb嘉泰姆	1.25\|0.8bwb嘉泰姆	5~12bwb嘉泰姆	3000bwb嘉泰姆
CXSD6278bwb嘉泰姆	SOP-8bwb嘉泰姆	VMbwb嘉泰姆	1bwb嘉泰姆	1bwb嘉泰姆	10bwb嘉泰姆	3.3bwb嘉泰姆	5.5bwb嘉泰姆	0.8bwb嘉泰姆	5bwb嘉泰姆	2100bwb嘉泰姆
CXSD6279Bbwb嘉泰姆	SOP-14bwb嘉泰姆	VM bwb嘉泰姆	1bwb嘉泰姆	1bwb嘉泰姆	10bwb嘉泰姆	5bwb嘉泰姆	13.2bwb嘉泰姆	0.8bwb嘉泰姆	12bwb嘉泰姆	2000bwb嘉泰姆
CXSD6280bwb嘉泰姆	TSSOP-24bwb嘉泰姆 \|QFN5x5-32bwb嘉泰姆	VMbwb嘉泰姆	1bwb嘉泰姆	2bwb嘉泰姆	20bwb嘉泰姆	5bwb嘉泰姆	13.2bwb嘉泰姆	0.6bwb嘉泰姆	5~12bwb嘉泰姆	4000bwb嘉泰姆
CXSD6281Nbwb嘉泰姆	SOP14bwb嘉泰姆 QSOP16bwb嘉泰姆 QFN-16bwb嘉泰姆	VMbwb嘉泰姆	1bwb嘉泰姆	1bwb嘉泰姆	30bwb嘉泰姆	2.9bwb嘉泰姆	13.2bwb嘉泰姆	0.9bwb嘉泰姆	12bwb嘉泰姆	4000bwb嘉泰姆
CXSD6282bwb嘉泰姆	SOP-14bwb嘉泰姆	VMbwb嘉泰姆	1bwb嘉泰姆	1bwb嘉泰姆	30bwb嘉泰姆	2.2bwb嘉泰姆	13.2bwb嘉泰姆	0.6bwb嘉泰姆	12bwb嘉泰姆	5000bwb嘉泰姆
CXSD6282Abwb嘉泰姆	SOP-14bwb嘉泰姆	VMbwb嘉泰姆	1bwb嘉泰姆	1bwb嘉泰姆	30bwb嘉泰姆	2.2bwb嘉泰姆	13.2bwb嘉泰姆	0.6bwb嘉泰姆	12bwb嘉泰姆	5000bwb嘉泰姆
CXSD6283bwb嘉泰姆	SOP-14bwb嘉泰姆	VMbwb嘉泰姆	1bwb嘉泰姆	1bwb嘉泰姆	25bwb嘉泰姆	2.2bwb嘉泰姆	13.2bwb嘉泰姆	0.8bwb嘉泰姆	12bwb嘉泰姆	5000bwb嘉泰姆
CXSD6284/Abwb嘉泰姆	LQFP7x7 48bwb嘉泰姆 TQFN7x7-48bwb嘉泰姆	VMbwb嘉泰姆	1bwb嘉泰姆	6bwb嘉泰姆	0.015bwb嘉泰姆	1.4bwb嘉泰姆	6.5bwb嘉泰姆	-bwb嘉泰姆	5bwb嘉泰姆	1800bwb嘉泰姆
CXSD6285bwb嘉泰姆	TSSOP-24Pbwb嘉泰姆	VMbwb嘉泰姆	1bwb嘉泰姆	2bwb嘉泰姆	20bwb嘉泰姆	2.97bwb嘉泰姆	5.5bwb嘉泰姆	0.8bwb嘉泰姆	5~12bwb嘉泰姆	5000bwb嘉泰姆
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