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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vG1嘉泰姆

1.产品概述                       2.产品特点vG1嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 vG1嘉泰姆
5.产品封装图                     6.电路原理图                   vG1嘉泰姆
7.功能概述                        8.相关产品vG1嘉泰姆

一,产品概述(General Description)  vG1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                                                         vG1嘉泰姆

产品特点(Features)vG1嘉泰姆

High Input Voltages Range from 3V to 28V Input PowervG1嘉泰姆
Provide Adjustable Output Voltage from 0.75V tovG1嘉泰姆
5.5V +1% Accuracy over TemperaturevG1嘉泰姆
Integrated MOSFET Drivers and Bootstrap Forward P-CH MOSFETvG1嘉泰姆
Low Quiescent Current (200μA)vG1嘉泰姆
Excellent Line and Load Transient ResponsesvG1嘉泰姆
PFM Mode for Increased Light Load EfficiencyvG1嘉泰姆
Constant On-Time Controller SchemevG1嘉泰姆
- Switching Frequency Compensation for PWM ModevG1嘉泰姆
- Adjustable Switching Frequency from 100kHz tovG1嘉泰姆
550kHz in PWM Mode with DC Output CurrentvG1嘉泰姆
S3 and S5 Pins Control The Device in S0, S3 or S4/S5 StatevG1嘉泰姆
Power Good MonitoringvG1嘉泰姆
Extra Droop Voltage Control Function withvG1嘉泰姆
Adjustable Current SettingvG1嘉泰姆
70% Under-Voltage Protection (UVP)vG1嘉泰姆
125% Over-Voltage Protection (OVP)vG1嘉泰姆
Adjustable Current-Limit ProtectionvG1嘉泰姆
- Using Sense Low-Side MOSFET’s RDS(ON)vG1嘉泰姆
TQFN-20 3mmx3mm Thin packagevG1嘉泰姆
Lead Free Available (RoHS Compliant)vG1嘉泰姆
+1.5A LDO Section (VTT)vG1嘉泰姆
Sourcing or Sinking Current up to 1.5AvG1嘉泰姆
Fast Transient Response for Output VoltagevG1嘉泰姆
Output Ceramic Capacitors Support at least 10μMLCCvG1嘉泰姆
VTT and VTTREF Track at Half the VDDQSNS by internal dividervG1嘉泰姆
+20mV Accuracy for VTT and VTTREFvG1嘉泰姆
Independent Over-Current Limit (OCL)vG1嘉泰姆
Thermal Shutdown ProtectionvG1嘉泰姆
三,应用范围 (Applications)vG1嘉泰姆


DDR2, and DDR3 Memory Power SuppliesvG1嘉泰姆
SSTL-2 SSTL-18 and HSTL TerminationvG1嘉泰姆
四.下载产品资料PDF文档 vG1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vG1嘉泰姆

 QQ截图20160419174301.jpgvG1嘉泰姆

五,产品封装图 (Package)vG1嘉泰姆


blob.pngvG1嘉泰姆
六.电路原理图vG1嘉泰姆


blob.pngvG1嘉泰姆

七,功能概述vG1嘉泰姆


Soft- Start (cont.)vG1嘉泰姆

During soft-start stage before the PGOOD pin is ready,vG1嘉泰姆
the under voltage protection is prohibited. The over volt-vG1嘉泰姆
age and current limit protection functions are enabled. IfvG1嘉泰姆
the output capacitor has residue voltage before startup,vG1嘉泰姆
both low-side and high-side MOSFETs are in off-statevG1嘉泰姆
until the internal digital soft start voltage equal the inter-vG1嘉泰姆
nal feedback voltage. This will ensure the output voltagevG1嘉泰姆
starts from its existing voltage level.vG1嘉泰姆
The VTT LDO part monitors the output current, both sourc-vG1嘉泰姆
ing and sinking current, and limits the maximum outputvG1嘉泰姆
current to prevent damages during current overload orvG1嘉泰姆
short circuit (shorted from VTT to GND or VLDOIN)vG1嘉泰姆
conditions.vG1嘉泰姆
The VTT LDO provides a soft-start function, using thevG1嘉泰姆
constant current to charge the output capacitor that givesvG1嘉泰姆
a rapid and linear output voltage rise. If the load current isvG1嘉泰姆
above the current limit start-up, the VTT cannot startvG1嘉泰姆
successfully.CXSD62121A CXSD62121B CXSD62121 has an independent counter for each output,vG1嘉泰姆
but the PGOOD signal indicates only the status of VDDQvG1嘉泰姆
and does not indicate VTT power good externally.vG1嘉泰姆
Power-Good Output (PGOOD)vG1嘉泰姆
PGOOD is an open-drain output and the PGOOD com-vG1嘉泰姆
parator continuously monitors the output voltage. PGOODvG1嘉泰姆
is actively held low in shutdown, and standby. When PWMvG1嘉泰姆
converter’s output voltage is greater than 95% of its tar-vG1嘉泰姆
get value, the internal open-drain device will be pulledvG1嘉泰姆
low. After 63μs debounce time, the PGOOD goes high.vG1嘉泰姆
The PGOOD goes low if VVDDQ output is 10% below orvG1嘉泰姆
above its nominal regulation point.vG1嘉泰姆
Under Voltage ProtectionvG1嘉泰姆
In the process of operation, if a short-circuit occurs, thevG1嘉泰姆
output voltage will drop quickly. When load current is big-vG1嘉泰姆
ger than current limit threshold value, the output voltagevG1嘉泰姆
will fall out of the required regulation range. The under-vG1嘉泰姆
voltage continually monitors the setting output voltagevG1嘉泰姆
after 2ms of PWM operations to ensure startup. If a loadvG1嘉泰姆
step is strong enough to pull the output voltage lowervG1嘉泰姆
than the under voltage threshold (70% of normal outputvG1嘉泰姆
voltage), CXSD62121A CXSD62121B CXSD62121 shuts down the output gradually andvG1嘉泰姆
latches off both high and low side MOSFETs.vG1嘉泰姆
Over Voltage Protection (OVP)vG1嘉泰姆
The feedback voltage should increase over 125% of thevG1嘉泰姆
reference voltage due to the high-side MOSFET failure orvG1嘉泰姆
for other reasons, and the over voltage protection com-vG1嘉泰姆
parator designed with a 1.5μs noise filter will force thevG1嘉泰姆
low-side MOSFET gate driver to be high. This action ac-vG1嘉泰姆
tively pulls down the output voltage and eventually at-vG1嘉泰姆
tempts to blow the battery fuse.vG1嘉泰姆
When the OVP occurs, the PGOOD pin will pull down andvG1嘉泰姆
latch-off the converter. This OVP scheme only clamps thevG1嘉泰姆
voltage overshoot, and does not invert the output voltagevG1嘉泰姆
when otherwise activated with a continuously high outputvG1嘉泰姆
from low-side MOSFET driver. It’s a common problem forvG1嘉泰姆
OVP schemes with a latch. Once an over-voltage faultvG1嘉泰姆
condition is set, toggling VCC power-on-reset signal canvG1嘉泰姆
only reset it.vG1嘉泰姆
PWM Converter Current LimitvG1嘉泰姆
The current-limit circuit employs a unique “valley” currentvG1嘉泰姆
sensing algorithm (Figure 2). CS pin should be con-vG1嘉泰姆
nected to VCC through the trip voltage-setting resistor,vG1嘉泰姆
RCS. CS terminal sinks 5mA current, ICS, and the currentvG1嘉泰姆
limit threshold is set to the voltage across the RCS. ThevG1嘉泰姆
voltage between or CS_GND pin and PHASE pin moni-vG1嘉泰姆
tors the inductor current so that PHASE pin should bevG1嘉泰姆
connected to the drain terminal of the low side MOSFET.vG1嘉泰姆
PGND is used as the positive current sensing node sovG1嘉泰姆
that PGND should be connected to the proper currentvG1嘉泰姆
sensing device, i.e. the sense resistor or the source ter-vG1嘉泰姆
minal of the low side MOSFET.vG1嘉泰姆
If the magnitude of the current-sense signal is above thevG1嘉泰姆
current-limit threshold, the PWM is not allowed to initiatevG1嘉泰姆
a new cycle. The actual peak current is greater than thevG1嘉泰姆
current-limit threshold by an amount equal to the induc-vG1嘉泰姆
tor ripple current. Therefore, the exact current- limit char-vG1嘉泰姆
acteristic and maximum load capability are a function ofvG1嘉泰姆
the sense resistance, inductor value, and input voltage.vG1嘉泰姆
八,相关产品               更多同类产品...... vG1嘉泰姆


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1vG1嘉泰姆

25vG1嘉泰姆

3vG1嘉泰姆

25vG1嘉泰姆

0.5vG1嘉泰姆

5vG1嘉泰姆

350vG1嘉泰姆

CXSD6294vG1嘉泰姆

QFN4x4-24vG1嘉泰姆

CMvG1嘉泰姆

2vG1嘉泰姆

1vG1嘉泰姆

40vG1嘉泰姆

4.5vG1嘉泰姆

13.2vG1嘉泰姆

0.6vG1嘉泰姆

5~12vG1嘉泰姆

4000vG1嘉泰姆

CXSD6295vG1嘉泰姆

SOP8PvG1嘉泰姆

TDFN3x3-10vG1嘉泰姆

VMvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

20vG1嘉泰姆

3vG1嘉泰姆

13.2vG1嘉泰姆

0.8vG1嘉泰姆

5~12vG1嘉泰姆

2500vG1嘉泰姆

CXSD6296A|B|C|DvG1嘉泰姆

SOP8PvG1嘉泰姆

VMvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

25vG1嘉泰姆

3vG1嘉泰姆

13.2vG1嘉泰姆

0.6|0.8vG1嘉泰姆

5~12vG1嘉泰姆

1200vG1嘉泰姆

CXSD6297vG1嘉泰姆

TDFN3x3-10vG1嘉泰姆

VMvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

25vG1嘉泰姆

4vG1嘉泰姆

13.2vG1嘉泰姆

0.8vG1嘉泰姆

5~12vG1嘉泰姆

2000vG1嘉泰姆

CXSD6298vG1嘉泰姆

TDFN3x3-10vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

25vG1嘉泰姆

4.5vG1嘉泰姆

25vG1嘉泰姆

0.6vG1嘉泰姆

5~12vG1嘉泰姆

80vG1嘉泰姆

CXSD6299|AvG1嘉泰姆

SOP-8PvG1嘉泰姆

VMvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

25vG1嘉泰姆

4.5vG1嘉泰姆

13.2vG1嘉泰姆

0.8vG1嘉泰姆

5~12vG1嘉泰姆

16000vG1嘉泰姆

CXSD62100vG1嘉泰姆

TQFN3x3-10vG1嘉泰姆

VMvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

25vG1嘉泰姆

4.5vG1嘉泰姆

13.2vG1嘉泰姆

0.6vG1嘉泰姆

5~12vG1嘉泰姆

2500vG1嘉泰姆

CXSD62101|LvG1嘉泰姆

TDFN3x3-10vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

30vG1嘉泰姆

3vG1嘉泰姆

25vG1嘉泰姆

0.8vG1嘉泰姆

5~12vG1嘉泰姆

2000vG1嘉泰姆

CXSD62102vG1嘉泰姆

TQFN3x3-16vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

30vG1嘉泰姆

1.8vG1嘉泰姆

28vG1嘉泰姆

0.6vG1嘉泰姆

5vG1嘉泰姆

600vG1嘉泰姆

CXSD62102AvG1嘉泰姆

TQFN 3x3 16vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

30vG1嘉泰姆

1.8vG1嘉泰姆

28vG1嘉泰姆

0.6vG1嘉泰姆

5vG1嘉泰姆

600vG1嘉泰姆

CXSD62103vG1嘉泰姆

QFN4x4-24vG1嘉泰姆

VMvG1嘉泰姆

2vG1嘉泰姆

1vG1嘉泰姆

50vG1嘉泰姆

4.5vG1嘉泰姆

13.2vG1嘉泰姆

0.6vG1嘉泰姆

5~12vG1嘉泰姆

5000vG1嘉泰姆

CXSD62104vG1嘉泰姆

TQFN4x4-24vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

2vG1嘉泰姆

15vG1嘉泰姆

6vG1嘉泰姆

25vG1嘉泰姆

2vG1嘉泰姆

NvG1嘉泰姆

550vG1嘉泰姆

CXSD62105vG1嘉泰姆

TQFN4x4-24vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

2vG1嘉泰姆

15vG1嘉泰姆

6vG1嘉泰姆

25vG1嘉泰姆

2vG1嘉泰姆

NvG1嘉泰姆

550vG1嘉泰姆

CXSD62106|AvG1嘉泰姆

TQFN4x4-4vG1嘉泰姆

TQFN3x3-20vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

2vG1嘉泰姆

20vG1嘉泰姆

3vG1嘉泰姆

28vG1嘉泰姆

0.75vG1嘉泰姆

5vG1嘉泰姆

800vG1嘉泰姆

CXSD62107vG1嘉泰姆

TQFN3x3-16vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

20vG1嘉泰姆

1.8vG1嘉泰姆

28vG1嘉泰姆

0.75vG1嘉泰姆

5vG1嘉泰姆

400vG1嘉泰姆

CXSD62108vG1嘉泰姆

QFN3.5x3.5-14vG1嘉泰姆

TQFN3x3-16vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

20vG1嘉泰姆

1.8vG1嘉泰姆

28vG1嘉泰姆

0.75vG1嘉泰姆

5vG1嘉泰姆

400vG1嘉泰姆

CXSD62109vG1嘉泰姆

TQFN3x3-16vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

2vG1嘉泰姆

20vG1嘉泰姆

1.8vG1嘉泰姆

28vG1嘉泰姆

0.75vG1嘉泰姆

5vG1嘉泰姆

400vG1嘉泰姆

CXSD62110vG1嘉泰姆

QFN3x3-20vG1嘉泰姆

TQFN3x3-16vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

2vG1嘉泰姆

20vG1嘉泰姆

3vG1嘉泰姆

28vG1嘉泰姆

1.8|1.5|0.5vG1嘉泰姆

5vG1嘉泰姆

740vG1嘉泰姆

CXSD62111vG1嘉泰姆

TQFN4x4-24vG1嘉泰姆

|QFN3x3-20vG1嘉泰姆

CMvG1嘉泰姆

1vG1嘉泰姆

2vG1嘉泰姆

15vG1嘉泰姆

5vG1嘉泰姆

28vG1嘉泰姆

0.5vG1嘉泰姆

NvG1嘉泰姆

3000vG1嘉泰姆

CXSD62112vG1嘉泰姆

TDFN3x3-10vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

20vG1嘉泰姆

1.8vG1嘉泰姆

28vG1嘉泰姆

0.5vG1嘉泰姆

5vG1嘉泰姆

250vG1嘉泰姆

CXSD62113|CvG1嘉泰姆

TQFN3x3-20vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

2vG1嘉泰姆

15vG1嘉泰姆

6vG1嘉泰姆

25vG1嘉泰姆

2vG1嘉泰姆

NvG1嘉泰姆

550vG1嘉泰姆

CXSD62113EvG1嘉泰姆

TQFN 3x3 20vG1嘉泰姆

COTvG1嘉泰姆

2vG1嘉泰姆

2vG1嘉泰姆

11vG1嘉泰姆

6vG1嘉泰姆

25vG1嘉泰姆

2vG1嘉泰姆

NvG1嘉泰姆

550vG1嘉泰姆

CXSD62114vG1嘉泰姆

TQFN3x3-20vG1嘉泰姆

COTvG1嘉泰姆

2vG1嘉泰姆

2vG1嘉泰姆

11vG1嘉泰姆

5.5vG1嘉泰姆

25vG1嘉泰姆

2vG1嘉泰姆

NvG1嘉泰姆

280vG1嘉泰姆

CXSD62115vG1嘉泰姆

QFN4x4-24vG1嘉泰姆

VMvG1嘉泰姆

2vG1嘉泰姆

1vG1嘉泰姆

60vG1嘉泰姆

3.1vG1嘉泰姆

13.2vG1嘉泰姆

0.85vG1嘉泰姆

12vG1嘉泰姆

5000vG1嘉泰姆

CXSD62116A|B|CvG1嘉泰姆

SOP-8PvG1嘉泰姆

VMvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

20vG1嘉泰姆

2.9vG1嘉泰姆

13.2vG1嘉泰姆

0.8vG1嘉泰姆

12vG1嘉泰姆

16000vG1嘉泰姆

CXSD62117vG1嘉泰姆

SOP-20vG1嘉泰姆

VMvG1嘉泰姆

2vG1嘉泰姆

2vG1嘉泰姆

30vG1嘉泰姆

10vG1嘉泰姆

13.2vG1嘉泰姆

1vG1嘉泰姆

12vG1嘉泰姆

5000vG1嘉泰姆

CXSD62118vG1嘉泰姆

TDFN3x3-10vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

1vG1嘉泰姆

25vG1嘉泰姆

1.8vG1嘉泰姆

28vG1嘉泰姆

0.7vG1嘉泰姆

5vG1嘉泰姆

250vG1嘉泰姆

CXSD62119vG1嘉泰姆

TQFN3x3-20vG1嘉泰姆

COTvG1嘉泰姆

2vG1嘉泰姆

1vG1嘉泰姆

40vG1嘉泰姆

1.8vG1嘉泰姆

25vG1嘉泰姆

REFIN SettingvG1嘉泰姆

5vG1嘉泰姆

700vG1嘉泰姆

CXSD62120vG1嘉泰姆

QFN 3x3 20vG1嘉泰姆

TQFN 3x3 16vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

2vG1嘉泰姆

20vG1嘉泰姆

3vG1嘉泰姆

28vG1嘉泰姆

1.8|1.5 1.35|1.2 0.5vG1嘉泰姆

5vG1嘉泰姆

800vG1嘉泰姆

CXSD62121AvG1嘉泰姆

TQFN3x3 20vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

2vG1嘉泰姆

15vG1嘉泰姆

3vG1嘉泰姆

28vG1嘉泰姆

0.75vG1嘉泰姆

5vG1嘉泰姆

220vG1嘉泰姆

CXSD62121BvG1嘉泰姆

TQFN3x3 20vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

2vG1嘉泰姆

15vG1嘉泰姆

3vG1嘉泰姆

28vG1嘉泰姆

0.75vG1嘉泰姆

5vG1嘉泰姆

220vG1嘉泰姆

CXSD62121vG1嘉泰姆

TQFN3x3-20vG1嘉泰姆

COTvG1嘉泰姆

1vG1嘉泰姆

2vG1嘉泰姆

20vG1嘉泰姆

3vG1嘉泰姆

28vG1嘉泰姆

0.75vG1嘉泰姆

5vG1嘉泰姆

180vG1嘉泰姆

 vG1嘉泰姆

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