CXSD62121A

CXSD62121A在功率因数调制(PFM)或脉冲宽度调制(PWM)模式下提供出色的瞬态响应和准确的直流电压输出

CXSD62121A同步buck-PWM控制器来产生VDDQ源极和陷极LDO线性调节器

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产品简介

目录Yuw嘉泰姆

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

一,产品概述(General Description)  Yuw嘉泰姆

    The CXSD62121A CXSD62121B CXSD62121 integrates a synchronous buck PWM con-troller to generate VDDQ, a sourcing and sinking LDO linear regulator to generate VTT. It offers the lowest total solution cost in system where space is at a premium.  The CXSD62121A CXSD62121B CXSD62121 provides excellent transient response and accurate DC voltage output in either PFM or PWM Mode.In Pulse Frequency Mode (PFM), the CXSD62121A CXSD62121B CXSD62121 provides very high efficiency over light to heavy loads with loading-modulated switching frequencies. On TQFN-20 Package,the Forced PWM Mode works nearly at constant frequency for low-noise requirements.  The CXSD62121A CXSD62121B CXSD62121 is equipped with accurate current-limit,output under-voltage, and output over-voltage protections.A Power-On- Reset function monitors the voltage on VCC prevents wrong operation during power on. Droop func-tion is allowed to adjust output voltage during light load period.The LDO is designed to provide a regulated voltage with bi-directional output current for DDR-SDRAM termination.The device integrates two power transistors to source or sink current up to 1.5A. It also incorporates current-limit and thermal shutdown protection.The output voltage of LDO tracks the voltage at VREF pin.An internal resistor divider is used to provide a half volt-age of VREF for VTTREF and VTT Voltage. The VTT output voltage is only requiring 20μF of ceramic output capaci tance for stability and fast transient response. The S3 and S5 pins provide the sleep state for VTT (S3 state)and suspend state (S4/S5 state) for device, when S5 and S3 are both pulled low the device provides the soft-off for VTT and VTTREF                                                         Yuw嘉泰姆

产品特点(Features)Yuw嘉泰姆

High Input Voltages Range from 3V to 28V Input PowerYuw嘉泰姆
Provide Adjustable Output Voltage from 0.75V toYuw嘉泰姆
5.5V +1% Accuracy over TemperatureYuw嘉泰姆
Integrated MOSFET Drivers and Bootstrap Forward P-CH MOSFETYuw嘉泰姆
Low Quiescent Current (200μA)Yuw嘉泰姆
Excellent Line and Load Transient ResponsesYuw嘉泰姆
PFM Mode for Increased Light Load EfficiencyYuw嘉泰姆
Constant On-Time Controller SchemeYuw嘉泰姆
- Switching Frequency Compensation for PWM ModeYuw嘉泰姆
- Adjustable Switching Frequency from 100kHz toYuw嘉泰姆
550kHz in PWM Mode with DC Output CurrentYuw嘉泰姆
S3 and S5 Pins Control The Device in S0, S3 or S4/S5 StateYuw嘉泰姆
Power Good MonitoringYuw嘉泰姆
Extra Droop Voltage Control Function withYuw嘉泰姆
Adjustable Current SettingYuw嘉泰姆
70% Under-Voltage Protection (UVP)Yuw嘉泰姆
125% Over-Voltage Protection (OVP)Yuw嘉泰姆
Adjustable Current-Limit ProtectionYuw嘉泰姆
- Using Sense Low-Side MOSFET’s RDS(ON)Yuw嘉泰姆
TQFN-20 3mmx3mm Thin packageYuw嘉泰姆
Lead Free Available (RoHS Compliant)Yuw嘉泰姆
+1.5A LDO Section (VTT)Yuw嘉泰姆
Sourcing or Sinking Current up to 1.5AYuw嘉泰姆
Fast Transient Response for Output VoltageYuw嘉泰姆
Output Ceramic Capacitors Support at least 10μMLCCYuw嘉泰姆
VTT and VTTREF Track at Half the VDDQSNS by internal dividerYuw嘉泰姆
+20mV Accuracy for VTT and VTTREFYuw嘉泰姆
Independent Over-Current Limit (OCL)Yuw嘉泰姆
Thermal Shutdown ProtectionYuw嘉泰姆
三,应用范围 (Applications)Yuw嘉泰姆


DDR2, and DDR3 Memory Power SuppliesYuw嘉泰姆
SSTL-2 SSTL-18 and HSTL TerminationYuw嘉泰姆
四.下载产品资料PDF文档 Yuw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Yuw嘉泰姆

 QQ截图20160419174301.jpgYuw嘉泰姆

五,产品封装图 (Package)Yuw嘉泰姆


blob.pngYuw嘉泰姆
六.电路原理图Yuw嘉泰姆


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七,功能概述Yuw嘉泰姆


Soft- Start (cont.)Yuw嘉泰姆

During soft-start stage before the PGOOD pin is ready,Yuw嘉泰姆
the under voltage protection is prohibited. The over volt-Yuw嘉泰姆
age and current limit protection functions are enabled. IfYuw嘉泰姆
the output capacitor has residue voltage before startup,Yuw嘉泰姆
both low-side and high-side MOSFETs are in off-stateYuw嘉泰姆
until the internal digital soft start voltage equal the inter-Yuw嘉泰姆
nal feedback voltage. This will ensure the output voltageYuw嘉泰姆
starts from its existing voltage level.Yuw嘉泰姆
The VTT LDO part monitors the output current, both sourc-Yuw嘉泰姆
ing and sinking current, and limits the maximum outputYuw嘉泰姆
current to prevent damages during current overload orYuw嘉泰姆
short circuit (shorted from VTT to GND or VLDOIN)Yuw嘉泰姆
conditions.Yuw嘉泰姆
The VTT LDO provides a soft-start function, using theYuw嘉泰姆
constant current to charge the output capacitor that givesYuw嘉泰姆
a rapid and linear output voltage rise. If the load current isYuw嘉泰姆
above the current limit start-up, the VTT cannot startYuw嘉泰姆
successfully.CXSD62121A CXSD62121B CXSD62121 has an independent counter for each output,Yuw嘉泰姆
but the PGOOD signal indicates only the status of VDDQYuw嘉泰姆
and does not indicate VTT power good externally.Yuw嘉泰姆
Power-Good Output (PGOOD)Yuw嘉泰姆
PGOOD is an open-drain output and the PGOOD com-Yuw嘉泰姆
parator continuously monitors the output voltage. PGOODYuw嘉泰姆
is actively held low in shutdown, and standby. When PWMYuw嘉泰姆
converter’s output voltage is greater than 95% of its tar-Yuw嘉泰姆
get value, the internal open-drain device will be pulledYuw嘉泰姆
low. After 63μs debounce time, the PGOOD goes high.Yuw嘉泰姆
The PGOOD goes low if VVDDQ output is 10% below orYuw嘉泰姆
above its nominal regulation point.Yuw嘉泰姆
Under Voltage ProtectionYuw嘉泰姆
In the process of operation, if a short-circuit occurs, theYuw嘉泰姆
output voltage will drop quickly. When load current is big-Yuw嘉泰姆
ger than current limit threshold value, the output voltageYuw嘉泰姆
will fall out of the required regulation range. The under-Yuw嘉泰姆
voltage continually monitors the setting output voltageYuw嘉泰姆
after 2ms of PWM operations to ensure startup. If a loadYuw嘉泰姆
step is strong enough to pull the output voltage lowerYuw嘉泰姆
than the under voltage threshold (70% of normal outputYuw嘉泰姆
voltage), CXSD62121A CXSD62121B CXSD62121 shuts down the output gradually andYuw嘉泰姆
latches off both high and low side MOSFETs.Yuw嘉泰姆
Over Voltage Protection (OVP)Yuw嘉泰姆
The feedback voltage should increase over 125% of theYuw嘉泰姆
reference voltage due to the high-side MOSFET failure orYuw嘉泰姆
for other reasons, and the over voltage protection com-Yuw嘉泰姆
parator designed with a 1.5μs noise filter will force theYuw嘉泰姆
low-side MOSFET gate driver to be high. This action ac-Yuw嘉泰姆
tively pulls down the output voltage and eventually at-Yuw嘉泰姆
tempts to blow the battery fuse.Yuw嘉泰姆
When the OVP occurs, the PGOOD pin will pull down andYuw嘉泰姆
latch-off the converter. This OVP scheme only clamps theYuw嘉泰姆
voltage overshoot, and does not invert the output voltageYuw嘉泰姆
when otherwise activated with a continuously high outputYuw嘉泰姆
from low-side MOSFET driver. It’s a common problem forYuw嘉泰姆
OVP schemes with a latch. Once an over-voltage faultYuw嘉泰姆
condition is set, toggling VCC power-on-reset signal canYuw嘉泰姆
only reset it.Yuw嘉泰姆
PWM Converter Current LimitYuw嘉泰姆
The current-limit circuit employs a unique “valley” currentYuw嘉泰姆
sensing algorithm (Figure 2). CS pin should be con-Yuw嘉泰姆
nected to VCC through the trip voltage-setting resistor,Yuw嘉泰姆
RCS. CS terminal sinks 5mA current, ICS, and the currentYuw嘉泰姆
limit threshold is set to the voltage across the RCS. TheYuw嘉泰姆
voltage between or CS_GND pin and PHASE pin moni-Yuw嘉泰姆
tors the inductor current so that PHASE pin should beYuw嘉泰姆
connected to the drain terminal of the low side MOSFET.Yuw嘉泰姆
PGND is used as the positive current sensing node soYuw嘉泰姆
that PGND should be connected to the proper currentYuw嘉泰姆
sensing device, i.e. the sense resistor or the source ter-Yuw嘉泰姆
minal of the low side MOSFET.Yuw嘉泰姆
If the magnitude of the current-sense signal is above theYuw嘉泰姆
current-limit threshold, the PWM is not allowed to initiateYuw嘉泰姆
a new cycle. The actual peak current is greater than theYuw嘉泰姆
current-limit threshold by an amount equal to the induc-Yuw嘉泰姆
tor ripple current. Therefore, the exact current- limit char-Yuw嘉泰姆
acteristic and maximum load capability are a function ofYuw嘉泰姆
the sense resistance, inductor value, and input voltage.Yuw嘉泰姆
八,相关产品               更多同类产品...... Yuw嘉泰姆


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5~12Yuw嘉泰姆

2000Yuw嘉泰姆

CXSD6298Yuw嘉泰姆

TDFN3x3-10Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

1Yuw嘉泰姆

25Yuw嘉泰姆

4.5Yuw嘉泰姆

25Yuw嘉泰姆

0.6Yuw嘉泰姆

5~12Yuw嘉泰姆

80Yuw嘉泰姆

CXSD6299|AYuw嘉泰姆

SOP-8PYuw嘉泰姆

VMYuw嘉泰姆

1Yuw嘉泰姆

1Yuw嘉泰姆

25Yuw嘉泰姆

4.5Yuw嘉泰姆

13.2Yuw嘉泰姆

0.8Yuw嘉泰姆

5~12Yuw嘉泰姆

16000Yuw嘉泰姆

CXSD62100Yuw嘉泰姆

TQFN3x3-10Yuw嘉泰姆

VMYuw嘉泰姆

1Yuw嘉泰姆

1Yuw嘉泰姆

25Yuw嘉泰姆

4.5Yuw嘉泰姆

13.2Yuw嘉泰姆

0.6Yuw嘉泰姆

5~12Yuw嘉泰姆

2500Yuw嘉泰姆

CXSD62101|LYuw嘉泰姆

TDFN3x3-10Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

1Yuw嘉泰姆

30Yuw嘉泰姆

3Yuw嘉泰姆

25Yuw嘉泰姆

0.8Yuw嘉泰姆

5~12Yuw嘉泰姆

2000Yuw嘉泰姆

CXSD62102Yuw嘉泰姆

TQFN3x3-16Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

1Yuw嘉泰姆

30Yuw嘉泰姆

1.8Yuw嘉泰姆

28Yuw嘉泰姆

0.6Yuw嘉泰姆

5Yuw嘉泰姆

600Yuw嘉泰姆

CXSD62102AYuw嘉泰姆

TQFN 3x3 16Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

1Yuw嘉泰姆

30Yuw嘉泰姆

1.8Yuw嘉泰姆

28Yuw嘉泰姆

0.6Yuw嘉泰姆

5Yuw嘉泰姆

600Yuw嘉泰姆

CXSD62103Yuw嘉泰姆

QFN4x4-24Yuw嘉泰姆

VMYuw嘉泰姆

2Yuw嘉泰姆

1Yuw嘉泰姆

50Yuw嘉泰姆

4.5Yuw嘉泰姆

13.2Yuw嘉泰姆

0.6Yuw嘉泰姆

5~12Yuw嘉泰姆

5000Yuw嘉泰姆

CXSD62104Yuw嘉泰姆

TQFN4x4-24Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

2Yuw嘉泰姆

15Yuw嘉泰姆

6Yuw嘉泰姆

25Yuw嘉泰姆

2Yuw嘉泰姆

NYuw嘉泰姆

550Yuw嘉泰姆

CXSD62105Yuw嘉泰姆

TQFN4x4-24Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

2Yuw嘉泰姆

15Yuw嘉泰姆

6Yuw嘉泰姆

25Yuw嘉泰姆

2Yuw嘉泰姆

NYuw嘉泰姆

550Yuw嘉泰姆

CXSD62106|AYuw嘉泰姆

TQFN4x4-4Yuw嘉泰姆

TQFN3x3-20Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

2Yuw嘉泰姆

20Yuw嘉泰姆

3Yuw嘉泰姆

28Yuw嘉泰姆

0.75Yuw嘉泰姆

5Yuw嘉泰姆

800Yuw嘉泰姆

CXSD62107Yuw嘉泰姆

TQFN3x3-16Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

1Yuw嘉泰姆

20Yuw嘉泰姆

1.8Yuw嘉泰姆

28Yuw嘉泰姆

0.75Yuw嘉泰姆

5Yuw嘉泰姆

400Yuw嘉泰姆

CXSD62108Yuw嘉泰姆

QFN3.5x3.5-14Yuw嘉泰姆

TQFN3x3-16Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

1Yuw嘉泰姆

20Yuw嘉泰姆

1.8Yuw嘉泰姆

28Yuw嘉泰姆

0.75Yuw嘉泰姆

5Yuw嘉泰姆

400Yuw嘉泰姆

CXSD62109Yuw嘉泰姆

TQFN3x3-16Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

2Yuw嘉泰姆

20Yuw嘉泰姆

1.8Yuw嘉泰姆

28Yuw嘉泰姆

0.75Yuw嘉泰姆

5Yuw嘉泰姆

400Yuw嘉泰姆

CXSD62110Yuw嘉泰姆

QFN3x3-20Yuw嘉泰姆

TQFN3x3-16Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

2Yuw嘉泰姆

20Yuw嘉泰姆

3Yuw嘉泰姆

28Yuw嘉泰姆

1.8|1.5|0.5Yuw嘉泰姆

5Yuw嘉泰姆

740Yuw嘉泰姆

CXSD62111Yuw嘉泰姆

TQFN4x4-24Yuw嘉泰姆

|QFN3x3-20Yuw嘉泰姆

CMYuw嘉泰姆

1Yuw嘉泰姆

2Yuw嘉泰姆

15Yuw嘉泰姆

5Yuw嘉泰姆

28Yuw嘉泰姆

0.5Yuw嘉泰姆

NYuw嘉泰姆

3000Yuw嘉泰姆

CXSD62112Yuw嘉泰姆

TDFN3x3-10Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

1Yuw嘉泰姆

20Yuw嘉泰姆

1.8Yuw嘉泰姆

28Yuw嘉泰姆

0.5Yuw嘉泰姆

5Yuw嘉泰姆

250Yuw嘉泰姆

CXSD62113|CYuw嘉泰姆

TQFN3x3-20Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

2Yuw嘉泰姆

15Yuw嘉泰姆

6Yuw嘉泰姆

25Yuw嘉泰姆

2Yuw嘉泰姆

NYuw嘉泰姆

550Yuw嘉泰姆

CXSD62113EYuw嘉泰姆

TQFN 3x3 20Yuw嘉泰姆

COTYuw嘉泰姆

2Yuw嘉泰姆

2Yuw嘉泰姆

11Yuw嘉泰姆

6Yuw嘉泰姆

25Yuw嘉泰姆

2Yuw嘉泰姆

NYuw嘉泰姆

550Yuw嘉泰姆

CXSD62114Yuw嘉泰姆

TQFN3x3-20Yuw嘉泰姆

COTYuw嘉泰姆

2Yuw嘉泰姆

2Yuw嘉泰姆

11Yuw嘉泰姆

5.5Yuw嘉泰姆

25Yuw嘉泰姆

2Yuw嘉泰姆

NYuw嘉泰姆

280Yuw嘉泰姆

CXSD62115Yuw嘉泰姆

QFN4x4-24Yuw嘉泰姆

VMYuw嘉泰姆

2Yuw嘉泰姆

1Yuw嘉泰姆

60Yuw嘉泰姆

3.1Yuw嘉泰姆

13.2Yuw嘉泰姆

0.85Yuw嘉泰姆

12Yuw嘉泰姆

5000Yuw嘉泰姆

CXSD62116A|B|CYuw嘉泰姆

SOP-8PYuw嘉泰姆

VMYuw嘉泰姆

1Yuw嘉泰姆

1Yuw嘉泰姆

20Yuw嘉泰姆

2.9Yuw嘉泰姆

13.2Yuw嘉泰姆

0.8Yuw嘉泰姆

12Yuw嘉泰姆

16000Yuw嘉泰姆

CXSD62117Yuw嘉泰姆

SOP-20Yuw嘉泰姆

VMYuw嘉泰姆

2Yuw嘉泰姆

2Yuw嘉泰姆

30Yuw嘉泰姆

10Yuw嘉泰姆

13.2Yuw嘉泰姆

1Yuw嘉泰姆

12Yuw嘉泰姆

5000Yuw嘉泰姆

CXSD62118Yuw嘉泰姆

TDFN3x3-10Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

1Yuw嘉泰姆

25Yuw嘉泰姆

1.8Yuw嘉泰姆

28Yuw嘉泰姆

0.7Yuw嘉泰姆

5Yuw嘉泰姆

250Yuw嘉泰姆

CXSD62119Yuw嘉泰姆

TQFN3x3-20Yuw嘉泰姆

COTYuw嘉泰姆

2Yuw嘉泰姆

1Yuw嘉泰姆

40Yuw嘉泰姆

1.8Yuw嘉泰姆

25Yuw嘉泰姆

REFIN SettingYuw嘉泰姆

5Yuw嘉泰姆

700Yuw嘉泰姆

CXSD62120Yuw嘉泰姆

QFN 3x3 20Yuw嘉泰姆

TQFN 3x3 16Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

2Yuw嘉泰姆

20Yuw嘉泰姆

3Yuw嘉泰姆

28Yuw嘉泰姆

1.8|1.5 1.35|1.2 0.5Yuw嘉泰姆

5Yuw嘉泰姆

800Yuw嘉泰姆

CXSD62121AYuw嘉泰姆

TQFN3x3 20Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

2Yuw嘉泰姆

15Yuw嘉泰姆

3Yuw嘉泰姆

28Yuw嘉泰姆

0.75Yuw嘉泰姆

5Yuw嘉泰姆

220Yuw嘉泰姆

CXSD62121BYuw嘉泰姆

TQFN3x3 20Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

2Yuw嘉泰姆

15Yuw嘉泰姆

3Yuw嘉泰姆

28Yuw嘉泰姆

0.75Yuw嘉泰姆

5Yuw嘉泰姆

220Yuw嘉泰姆

CXSD62121Yuw嘉泰姆

TQFN3x3-20Yuw嘉泰姆

COTYuw嘉泰姆

1Yuw嘉泰姆

2Yuw嘉泰姆

20Yuw嘉泰姆

3Yuw嘉泰姆

28Yuw嘉泰姆

0.75Yuw嘉泰姆

5Yuw嘉泰姆

180Yuw嘉泰姆

 Yuw嘉泰姆

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