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首页 > 产品中心 > 电源管理 > DC降压型芯片 > Buck降压型芯片 >CXSD62121 VTT的输出电压只需要20μF的陶瓷输出电容就可以稳定和快速的瞬态响应
CXSD62121 VTT的输出电压只需要20μF的陶瓷输出电容就可以稳定和快速的瞬态响应
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CXSD62121在轻载期间,允许下垂功能调整输出电压。LDO设计用于为DDR-SDRAM终端提供双向输出电流的稳压。该装置集成了两个功率晶体管,源或汇电流高达1.5A。它还集成了电流限制和热关机保护。

CXSD62121 VTT的输出电压只需要20μF的陶瓷输出电容就可以稳定和快速的瞬态响应
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目录sdq嘉泰姆

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

一,产品概述(General Description)  sdq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                                                         sdq嘉泰姆

产品特点(Features)sdq嘉泰姆

High Input Voltages Range from 3V to 28V Input Powersdq嘉泰姆
Provide Adjustable Output Voltage from 0.75V tosdq嘉泰姆
5.5V +1% Accuracy over Temperaturesdq嘉泰姆
Integrated MOSFET Drivers and Bootstrap Forward P-CH MOSFETsdq嘉泰姆
Low Quiescent Current (200μA)sdq嘉泰姆
Excellent Line and Load Transient Responsessdq嘉泰姆
PFM Mode for Increased Light Load Efficiencysdq嘉泰姆
Constant On-Time Controller Schemesdq嘉泰姆
- Switching Frequency Compensation for PWM Modesdq嘉泰姆
- Adjustable Switching Frequency from 100kHz tosdq嘉泰姆
550kHz in PWM Mode with DC Output Currentsdq嘉泰姆
S3 and S5 Pins Control The Device in S0, S3 or S4/S5 Statesdq嘉泰姆
Power Good Monitoringsdq嘉泰姆
Extra Droop Voltage Control Function withsdq嘉泰姆
Adjustable Current Settingsdq嘉泰姆
70% Under-Voltage Protection (UVP)sdq嘉泰姆
125% Over-Voltage Protection (OVP)sdq嘉泰姆
Adjustable Current-Limit Protectionsdq嘉泰姆
- Using Sense Low-Side MOSFET’s RDS(ON)sdq嘉泰姆
TQFN-20 3mmx3mm Thin packagesdq嘉泰姆
Lead Free Available (RoHS Compliant)sdq嘉泰姆
+1.5A LDO Section (VTT)sdq嘉泰姆
Sourcing or Sinking Current up to 1.5Asdq嘉泰姆
Fast Transient Response for Output Voltagesdq嘉泰姆
Output Ceramic Capacitors Support at least 10μMLCCsdq嘉泰姆
VTT and VTTREF Track at Half the VDDQSNS by internal dividersdq嘉泰姆
+20mV Accuracy for VTT and VTTREFsdq嘉泰姆
Independent Over-Current Limit (OCL)sdq嘉泰姆
Thermal Shutdown Protectionsdq嘉泰姆
三,应用范围 (Applications)sdq嘉泰姆


DDR2, and DDR3 Memory Power Suppliessdq嘉泰姆
SSTL-2 SSTL-18 and HSTL Terminationsdq嘉泰姆
四.下载产品资料PDF文档 sdq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sdq嘉泰姆

 QQ截图20160419174301.jpgsdq嘉泰姆

五,产品封装图 (Package)sdq嘉泰姆


blob.pngsdq嘉泰姆
六.电路原理图sdq嘉泰姆


blob.pngsdq嘉泰姆

七,功能概述sdq嘉泰姆


Soft- Start (cont.)sdq嘉泰姆

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

1sdq嘉泰姆

1sdq嘉泰姆

25sdq嘉泰姆

3sdq嘉泰姆

13.2sdq嘉泰姆

0.6|0.8sdq嘉泰姆

5~12sdq嘉泰姆

1200sdq嘉泰姆

CXSD6297sdq嘉泰姆

TDFN3x3-10sdq嘉泰姆

VMsdq嘉泰姆

1sdq嘉泰姆

1sdq嘉泰姆

25sdq嘉泰姆

4sdq嘉泰姆

13.2sdq嘉泰姆

0.8sdq嘉泰姆

5~12sdq嘉泰姆

2000sdq嘉泰姆

CXSD6298sdq嘉泰姆

TDFN3x3-10sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

1sdq嘉泰姆

25sdq嘉泰姆

4.5sdq嘉泰姆

25sdq嘉泰姆

0.6sdq嘉泰姆

5~12sdq嘉泰姆

80sdq嘉泰姆

CXSD6299|Asdq嘉泰姆

SOP-8Psdq嘉泰姆

VMsdq嘉泰姆

1sdq嘉泰姆

1sdq嘉泰姆

25sdq嘉泰姆

4.5sdq嘉泰姆

13.2sdq嘉泰姆

0.8sdq嘉泰姆

5~12sdq嘉泰姆

16000sdq嘉泰姆

CXSD62100sdq嘉泰姆

TQFN3x3-10sdq嘉泰姆

VMsdq嘉泰姆

1sdq嘉泰姆

1sdq嘉泰姆

25sdq嘉泰姆

4.5sdq嘉泰姆

13.2sdq嘉泰姆

0.6sdq嘉泰姆

5~12sdq嘉泰姆

2500sdq嘉泰姆

CXSD62101|Lsdq嘉泰姆

TDFN3x3-10sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

1sdq嘉泰姆

30sdq嘉泰姆

3sdq嘉泰姆

25sdq嘉泰姆

0.8sdq嘉泰姆

5~12sdq嘉泰姆

2000sdq嘉泰姆

CXSD62102sdq嘉泰姆

TQFN3x3-16sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

1sdq嘉泰姆

30sdq嘉泰姆

1.8sdq嘉泰姆

28sdq嘉泰姆

0.6sdq嘉泰姆

5sdq嘉泰姆

600sdq嘉泰姆

CXSD62102Asdq嘉泰姆

TQFN 3x3 16sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

1sdq嘉泰姆

30sdq嘉泰姆

1.8sdq嘉泰姆

28sdq嘉泰姆

0.6sdq嘉泰姆

5sdq嘉泰姆

600sdq嘉泰姆

CXSD62103sdq嘉泰姆

QFN4x4-24sdq嘉泰姆

VMsdq嘉泰姆

2sdq嘉泰姆

1sdq嘉泰姆

50sdq嘉泰姆

4.5sdq嘉泰姆

13.2sdq嘉泰姆

0.6sdq嘉泰姆

5~12sdq嘉泰姆

5000sdq嘉泰姆

CXSD62104sdq嘉泰姆

TQFN4x4-24sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

2sdq嘉泰姆

15sdq嘉泰姆

6sdq嘉泰姆

25sdq嘉泰姆

2sdq嘉泰姆

Nsdq嘉泰姆

550sdq嘉泰姆

CXSD62105sdq嘉泰姆

TQFN4x4-24sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

2sdq嘉泰姆

15sdq嘉泰姆

6sdq嘉泰姆

25sdq嘉泰姆

2sdq嘉泰姆

Nsdq嘉泰姆

550sdq嘉泰姆

CXSD62106|Asdq嘉泰姆

TQFN4x4-4sdq嘉泰姆

TQFN3x3-20sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

2sdq嘉泰姆

20sdq嘉泰姆

3sdq嘉泰姆

28sdq嘉泰姆

0.75sdq嘉泰姆

5sdq嘉泰姆

800sdq嘉泰姆

CXSD62107sdq嘉泰姆

TQFN3x3-16sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

1sdq嘉泰姆

20sdq嘉泰姆

1.8sdq嘉泰姆

28sdq嘉泰姆

0.75sdq嘉泰姆

5sdq嘉泰姆

400sdq嘉泰姆

CXSD62108sdq嘉泰姆

QFN3.5x3.5-14sdq嘉泰姆

TQFN3x3-16sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

1sdq嘉泰姆

20sdq嘉泰姆

1.8sdq嘉泰姆

28sdq嘉泰姆

0.75sdq嘉泰姆

5sdq嘉泰姆

400sdq嘉泰姆

CXSD62109sdq嘉泰姆

TQFN3x3-16sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

2sdq嘉泰姆

20sdq嘉泰姆

1.8sdq嘉泰姆

28sdq嘉泰姆

0.75sdq嘉泰姆

5sdq嘉泰姆

400sdq嘉泰姆

CXSD62110sdq嘉泰姆

QFN3x3-20sdq嘉泰姆

TQFN3x3-16sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

2sdq嘉泰姆

20sdq嘉泰姆

3sdq嘉泰姆

28sdq嘉泰姆

1.8|1.5|0.5sdq嘉泰姆

5sdq嘉泰姆

740sdq嘉泰姆

CXSD62111sdq嘉泰姆

TQFN4x4-24sdq嘉泰姆

|QFN3x3-20sdq嘉泰姆

CMsdq嘉泰姆

1sdq嘉泰姆

2sdq嘉泰姆

15sdq嘉泰姆

5sdq嘉泰姆

28sdq嘉泰姆

0.5sdq嘉泰姆

Nsdq嘉泰姆

3000sdq嘉泰姆

CXSD62112sdq嘉泰姆

TDFN3x3-10sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

1sdq嘉泰姆

20sdq嘉泰姆

1.8sdq嘉泰姆

28sdq嘉泰姆

0.5sdq嘉泰姆

5sdq嘉泰姆

250sdq嘉泰姆

CXSD62113|Csdq嘉泰姆

TQFN3x3-20sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

2sdq嘉泰姆

15sdq嘉泰姆

6sdq嘉泰姆

25sdq嘉泰姆

2sdq嘉泰姆

Nsdq嘉泰姆

550sdq嘉泰姆

CXSD62113Esdq嘉泰姆

TQFN 3x3 20sdq嘉泰姆

COTsdq嘉泰姆

2sdq嘉泰姆

2sdq嘉泰姆

11sdq嘉泰姆

6sdq嘉泰姆

25sdq嘉泰姆

2sdq嘉泰姆

Nsdq嘉泰姆

550sdq嘉泰姆

CXSD62114sdq嘉泰姆

TQFN3x3-20sdq嘉泰姆

COTsdq嘉泰姆

2sdq嘉泰姆

2sdq嘉泰姆

11sdq嘉泰姆

5.5sdq嘉泰姆

25sdq嘉泰姆

2sdq嘉泰姆

Nsdq嘉泰姆

280sdq嘉泰姆

CXSD62115sdq嘉泰姆

QFN4x4-24sdq嘉泰姆

VMsdq嘉泰姆

2sdq嘉泰姆

1sdq嘉泰姆

60sdq嘉泰姆

3.1sdq嘉泰姆

13.2sdq嘉泰姆

0.85sdq嘉泰姆

12sdq嘉泰姆

5000sdq嘉泰姆

CXSD62116A|B|Csdq嘉泰姆

SOP-8Psdq嘉泰姆

VMsdq嘉泰姆

1sdq嘉泰姆

1sdq嘉泰姆

20sdq嘉泰姆

2.9sdq嘉泰姆

13.2sdq嘉泰姆

0.8sdq嘉泰姆

12sdq嘉泰姆

16000sdq嘉泰姆

CXSD62117sdq嘉泰姆

SOP-20sdq嘉泰姆

VMsdq嘉泰姆

2sdq嘉泰姆

2sdq嘉泰姆

30sdq嘉泰姆

10sdq嘉泰姆

13.2sdq嘉泰姆

1sdq嘉泰姆

12sdq嘉泰姆

5000sdq嘉泰姆

CXSD62118sdq嘉泰姆

TDFN3x3-10sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

1sdq嘉泰姆

25sdq嘉泰姆

1.8sdq嘉泰姆

28sdq嘉泰姆

0.7sdq嘉泰姆

5sdq嘉泰姆

250sdq嘉泰姆

CXSD62119sdq嘉泰姆

TQFN3x3-20sdq嘉泰姆

COTsdq嘉泰姆

2sdq嘉泰姆

1sdq嘉泰姆

40sdq嘉泰姆

1.8sdq嘉泰姆

25sdq嘉泰姆

REFIN Settingsdq嘉泰姆

5sdq嘉泰姆

700sdq嘉泰姆

CXSD62120sdq嘉泰姆

QFN 3x3 20sdq嘉泰姆

TQFN 3x3 16sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

2sdq嘉泰姆

20sdq嘉泰姆

3sdq嘉泰姆

28sdq嘉泰姆

1.8|1.5 1.35|1.2 0.5sdq嘉泰姆

5sdq嘉泰姆

800sdq嘉泰姆

CXSD62121Asdq嘉泰姆

TQFN3x3 20sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

2sdq嘉泰姆

15sdq嘉泰姆

3sdq嘉泰姆

28sdq嘉泰姆

0.75sdq嘉泰姆

5sdq嘉泰姆

220sdq嘉泰姆

CXSD62121Bsdq嘉泰姆

TQFN3x3 20sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

2sdq嘉泰姆

15sdq嘉泰姆

3sdq嘉泰姆

28sdq嘉泰姆

0.75sdq嘉泰姆

5sdq嘉泰姆

220sdq嘉泰姆

CXSD62121sdq嘉泰姆

TQFN3x3-20sdq嘉泰姆

COTsdq嘉泰姆

1sdq嘉泰姆

2sdq嘉泰姆

20sdq嘉泰姆

3sdq嘉泰姆

28sdq嘉泰姆

0.75sdq嘉泰姆

5sdq嘉泰姆

180sdq嘉泰姆

 sdq嘉泰姆

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