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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
2

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bqa嘉泰姆

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

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

产品特点(Features)bqa嘉泰姆

High Input Voltages Range from 3V to 28V Input Powerbqa嘉泰姆
Provide Adjustable Output Voltage from 0.75V tobqa嘉泰姆
5.5V +1% Accuracy over Temperaturebqa嘉泰姆
Integrated MOSFET Drivers and Bootstrap Forward P-CH MOSFETbqa嘉泰姆
Low Quiescent Current (200μA)bqa嘉泰姆
Excellent Line and Load Transient Responsesbqa嘉泰姆
PFM Mode for Increased Light Load Efficiencybqa嘉泰姆
Constant On-Time Controller Schemebqa嘉泰姆
- Switching Frequency Compensation for PWM Modebqa嘉泰姆
- Adjustable Switching Frequency from 100kHz tobqa嘉泰姆
550kHz in PWM Mode with DC Output Currentbqa嘉泰姆
S3 and S5 Pins Control The Device in S0, S3 or S4/S5 Statebqa嘉泰姆
Power Good Monitoringbqa嘉泰姆
Extra Droop Voltage Control Function withbqa嘉泰姆
Adjustable Current Settingbqa嘉泰姆
70% Under-Voltage Protection (UVP)bqa嘉泰姆
125% Over-Voltage Protection (OVP)bqa嘉泰姆
Adjustable Current-Limit Protectionbqa嘉泰姆
- Using Sense Low-Side MOSFET’s RDS(ON)bqa嘉泰姆
TQFN-20 3mmx3mm Thin packagebqa嘉泰姆
Lead Free Available (RoHS Compliant)bqa嘉泰姆
+1.5A LDO Section (VTT)bqa嘉泰姆
Sourcing or Sinking Current up to 1.5Abqa嘉泰姆
Fast Transient Response for Output Voltagebqa嘉泰姆
Output Ceramic Capacitors Support at least 10μMLCCbqa嘉泰姆
VTT and VTTREF Track at Half the VDDQSNS by internal dividerbqa嘉泰姆
+20mV Accuracy for VTT and VTTREFbqa嘉泰姆
Independent Over-Current Limit (OCL)bqa嘉泰姆
Thermal Shutdown Protectionbqa嘉泰姆
三,应用范围 (Applications)bqa嘉泰姆


DDR2, and DDR3 Memory Power Suppliesbqa嘉泰姆
SSTL-2 SSTL-18 and HSTL Terminationbqa嘉泰姆
四.下载产品资料PDF文档 bqa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bqa嘉泰姆

 QQ截图20160419174301.jpgbqa嘉泰姆

五,产品封装图 (Package)bqa嘉泰姆


blob.pngbqa嘉泰姆
六.电路原理图bqa嘉泰姆


blob.pngbqa嘉泰姆

七,功能概述bqa嘉泰姆


Soft- Start (cont.)bqa嘉泰姆

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