CXSD62121

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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产品简介

目录LN5嘉泰姆

1.产品概述                       2.产品特点LN5嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 LN5嘉泰姆
5.产品封装图                     6.电路原理图                   LN5嘉泰姆
7.功能概述                        8.相关产品LN5嘉泰姆

一,产品概述(General Description)  LN5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                                                         LN5嘉泰姆

产品特点(Features)LN5嘉泰姆

High Input Voltages Range from 3V to 28V Input PowerLN5嘉泰姆
Provide Adjustable Output Voltage from 0.75V toLN5嘉泰姆
5.5V +1% Accuracy over TemperatureLN5嘉泰姆
Integrated MOSFET Drivers and Bootstrap Forward P-CH MOSFETLN5嘉泰姆
Low Quiescent Current (200μA)LN5嘉泰姆
Excellent Line and Load Transient ResponsesLN5嘉泰姆
PFM Mode for Increased Light Load EfficiencyLN5嘉泰姆
Constant On-Time Controller SchemeLN5嘉泰姆
- Switching Frequency Compensation for PWM ModeLN5嘉泰姆
- Adjustable Switching Frequency from 100kHz toLN5嘉泰姆
550kHz in PWM Mode with DC Output CurrentLN5嘉泰姆
S3 and S5 Pins Control The Device in S0, S3 or S4/S5 StateLN5嘉泰姆
Power Good MonitoringLN5嘉泰姆
Extra Droop Voltage Control Function withLN5嘉泰姆
Adjustable Current SettingLN5嘉泰姆
70% Under-Voltage Protection (UVP)LN5嘉泰姆
125% Over-Voltage Protection (OVP)LN5嘉泰姆
Adjustable Current-Limit ProtectionLN5嘉泰姆
- Using Sense Low-Side MOSFET’s RDS(ON)LN5嘉泰姆
TQFN-20 3mmx3mm Thin packageLN5嘉泰姆
Lead Free Available (RoHS Compliant)LN5嘉泰姆
+1.5A LDO Section (VTT)LN5嘉泰姆
Sourcing or Sinking Current up to 1.5ALN5嘉泰姆
Fast Transient Response for Output VoltageLN5嘉泰姆
Output Ceramic Capacitors Support at least 10μMLCCLN5嘉泰姆
VTT and VTTREF Track at Half the VDDQSNS by internal dividerLN5嘉泰姆
+20mV Accuracy for VTT and VTTREFLN5嘉泰姆
Independent Over-Current Limit (OCL)LN5嘉泰姆
Thermal Shutdown ProtectionLN5嘉泰姆
三,应用范围 (Applications)LN5嘉泰姆


DDR2, and DDR3 Memory Power SuppliesLN5嘉泰姆
SSTL-2 SSTL-18 and HSTL TerminationLN5嘉泰姆
四.下载产品资料PDF文档 LN5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LN5嘉泰姆

 QQ截图20160419174301.jpgLN5嘉泰姆

五,产品封装图 (Package)LN5嘉泰姆


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六.电路原理图LN5嘉泰姆


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七,功能概述LN5嘉泰姆


Soft- Start (cont.)LN5嘉泰姆

During soft-start stage before the PGOOD pin is ready,LN5嘉泰姆
the under voltage protection is prohibited. The over volt-LN5嘉泰姆
age and current limit protection functions are enabled. IfLN5嘉泰姆
the output capacitor has residue voltage before startup,LN5嘉泰姆
both low-side and high-side MOSFETs are in off-stateLN5嘉泰姆
until the internal digital soft start voltage equal the inter-LN5嘉泰姆
nal feedback voltage. This will ensure the output voltageLN5嘉泰姆
starts from its existing voltage level.LN5嘉泰姆
The VTT LDO part monitors the output current, both sourc-LN5嘉泰姆
ing and sinking current, and limits the maximum outputLN5嘉泰姆
current to prevent damages during current overload orLN5嘉泰姆
short circuit (shorted from VTT to GND or VLDOIN)LN5嘉泰姆
conditions.LN5嘉泰姆
The VTT LDO provides a soft-start function, using theLN5嘉泰姆
constant current to charge the output capacitor that givesLN5嘉泰姆
a rapid and linear output voltage rise. If the load current isLN5嘉泰姆
above the current limit start-up, the VTT cannot startLN5嘉泰姆
successfully.CXSD62121A CXSD62121B CXSD62121 has an independent counter for each output,LN5嘉泰姆
but the PGOOD signal indicates only the status of VDDQLN5嘉泰姆
and does not indicate VTT power good externally.LN5嘉泰姆
Power-Good Output (PGOOD)LN5嘉泰姆
PGOOD is an open-drain output and the PGOOD com-LN5嘉泰姆
parator continuously monitors the output voltage. PGOODLN5嘉泰姆
is actively held low in shutdown, and standby. When PWMLN5嘉泰姆
converter’s output voltage is greater than 95% of its tar-LN5嘉泰姆
get value, the internal open-drain device will be pulledLN5嘉泰姆
low. After 63μs debounce time, the PGOOD goes high.LN5嘉泰姆
The PGOOD goes low if VVDDQ output is 10% below orLN5嘉泰姆
above its nominal regulation point.LN5嘉泰姆
Under Voltage ProtectionLN5嘉泰姆
In the process of operation, if a short-circuit occurs, theLN5嘉泰姆
output voltage will drop quickly. When load current is big-LN5嘉泰姆
ger than current limit threshold value, the output voltageLN5嘉泰姆
will fall out of the required regulation range. The under-LN5嘉泰姆
voltage continually monitors the setting output voltageLN5嘉泰姆
after 2ms of PWM operations to ensure startup. If a loadLN5嘉泰姆
step is strong enough to pull the output voltage lowerLN5嘉泰姆
than the under voltage threshold (70% of normal outputLN5嘉泰姆
voltage), CXSD62121A CXSD62121B CXSD62121 shuts down the output gradually andLN5嘉泰姆
latches off both high and low side MOSFETs.LN5嘉泰姆
Over Voltage Protection (OVP)LN5嘉泰姆
The feedback voltage should increase over 125% of theLN5嘉泰姆
reference voltage due to the high-side MOSFET failure orLN5嘉泰姆
for other reasons, and the over voltage protection com-LN5嘉泰姆
parator designed with a 1.5μs noise filter will force theLN5嘉泰姆
low-side MOSFET gate driver to be high. This action ac-LN5嘉泰姆
tively pulls down the output voltage and eventually at-LN5嘉泰姆
tempts to blow the battery fuse.LN5嘉泰姆
When the OVP occurs, the PGOOD pin will pull down andLN5嘉泰姆
latch-off the converter. This OVP scheme only clamps theLN5嘉泰姆
voltage overshoot, and does not invert the output voltageLN5嘉泰姆
when otherwise activated with a continuously high outputLN5嘉泰姆
from low-side MOSFET driver. It’s a common problem forLN5嘉泰姆
OVP schemes with a latch. Once an over-voltage faultLN5嘉泰姆
condition is set, toggling VCC power-on-reset signal canLN5嘉泰姆
only reset it.LN5嘉泰姆
PWM Converter Current LimitLN5嘉泰姆
The current-limit circuit employs a unique “valley” currentLN5嘉泰姆
sensing algorithm (Figure 2). CS pin should be con-LN5嘉泰姆
nected to VCC through the trip voltage-setting resistor,LN5嘉泰姆
RCS. CS terminal sinks 5mA current, ICS, and the currentLN5嘉泰姆
limit threshold is set to the voltage across the RCS. TheLN5嘉泰姆
voltage between or CS_GND pin and PHASE pin moni-LN5嘉泰姆
tors the inductor current so that PHASE pin should beLN5嘉泰姆
connected to the drain terminal of the low side MOSFET.LN5嘉泰姆
PGND is used as the positive current sensing node soLN5嘉泰姆
that PGND should be connected to the proper currentLN5嘉泰姆
sensing device, i.e. the sense resistor or the source ter-LN5嘉泰姆
minal of the low side MOSFET.LN5嘉泰姆
If the magnitude of the current-sense signal is above theLN5嘉泰姆
current-limit threshold, the PWM is not allowed to initiateLN5嘉泰姆
a new cycle. The actual peak current is greater than theLN5嘉泰姆
current-limit threshold by an amount equal to the induc-LN5嘉泰姆
tor ripple current. Therefore, the exact current- limit char-LN5嘉泰姆
acteristic and maximum load capability are a function ofLN5嘉泰姆
the sense resistance, inductor value, and input voltage.LN5嘉泰姆
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CXSD6297LN5嘉泰姆

TDFN3x3-10LN5嘉泰姆

VMLN5嘉泰姆

1LN5嘉泰姆

1LN5嘉泰姆

25LN5嘉泰姆

4LN5嘉泰姆

13.2LN5嘉泰姆

0.8LN5嘉泰姆

5~12LN5嘉泰姆

2000LN5嘉泰姆

CXSD6298LN5嘉泰姆

TDFN3x3-10LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

1LN5嘉泰姆

25LN5嘉泰姆

4.5LN5嘉泰姆

25LN5嘉泰姆

0.6LN5嘉泰姆

5~12LN5嘉泰姆

80LN5嘉泰姆

CXSD6299|ALN5嘉泰姆

SOP-8PLN5嘉泰姆

VMLN5嘉泰姆

1LN5嘉泰姆

1LN5嘉泰姆

25LN5嘉泰姆

4.5LN5嘉泰姆

13.2LN5嘉泰姆

0.8LN5嘉泰姆

5~12LN5嘉泰姆

16000LN5嘉泰姆

CXSD62100LN5嘉泰姆

TQFN3x3-10LN5嘉泰姆

VMLN5嘉泰姆

1LN5嘉泰姆

1LN5嘉泰姆

25LN5嘉泰姆

4.5LN5嘉泰姆

13.2LN5嘉泰姆

0.6LN5嘉泰姆

5~12LN5嘉泰姆

2500LN5嘉泰姆

CXSD62101|LLN5嘉泰姆

TDFN3x3-10LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

1LN5嘉泰姆

30LN5嘉泰姆

3LN5嘉泰姆

25LN5嘉泰姆

0.8LN5嘉泰姆

5~12LN5嘉泰姆

2000LN5嘉泰姆

CXSD62102LN5嘉泰姆

TQFN3x3-16LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

1LN5嘉泰姆

30LN5嘉泰姆

1.8LN5嘉泰姆

28LN5嘉泰姆

0.6LN5嘉泰姆

5LN5嘉泰姆

600LN5嘉泰姆

CXSD62102ALN5嘉泰姆

TQFN 3x3 16LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

1LN5嘉泰姆

30LN5嘉泰姆

1.8LN5嘉泰姆

28LN5嘉泰姆

0.6LN5嘉泰姆

5LN5嘉泰姆

600LN5嘉泰姆

CXSD62103LN5嘉泰姆

QFN4x4-24LN5嘉泰姆

VMLN5嘉泰姆

2LN5嘉泰姆

1LN5嘉泰姆

50LN5嘉泰姆

4.5LN5嘉泰姆

13.2LN5嘉泰姆

0.6LN5嘉泰姆

5~12LN5嘉泰姆

5000LN5嘉泰姆

CXSD62104LN5嘉泰姆

TQFN4x4-24LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

2LN5嘉泰姆

15LN5嘉泰姆

6LN5嘉泰姆

25LN5嘉泰姆

2LN5嘉泰姆

NLN5嘉泰姆

550LN5嘉泰姆

CXSD62105LN5嘉泰姆

TQFN4x4-24LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

2LN5嘉泰姆

15LN5嘉泰姆

6LN5嘉泰姆

25LN5嘉泰姆

2LN5嘉泰姆

NLN5嘉泰姆

550LN5嘉泰姆

CXSD62106|ALN5嘉泰姆

TQFN4x4-4LN5嘉泰姆

TQFN3x3-20LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

2LN5嘉泰姆

20LN5嘉泰姆

3LN5嘉泰姆

28LN5嘉泰姆

0.75LN5嘉泰姆

5LN5嘉泰姆

800LN5嘉泰姆

CXSD62107LN5嘉泰姆

TQFN3x3-16LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

1LN5嘉泰姆

20LN5嘉泰姆

1.8LN5嘉泰姆

28LN5嘉泰姆

0.75LN5嘉泰姆

5LN5嘉泰姆

400LN5嘉泰姆

CXSD62108LN5嘉泰姆

QFN3.5x3.5-14LN5嘉泰姆

TQFN3x3-16LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

1LN5嘉泰姆

20LN5嘉泰姆

1.8LN5嘉泰姆

28LN5嘉泰姆

0.75LN5嘉泰姆

5LN5嘉泰姆

400LN5嘉泰姆

CXSD62109LN5嘉泰姆

TQFN3x3-16LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

2LN5嘉泰姆

20LN5嘉泰姆

1.8LN5嘉泰姆

28LN5嘉泰姆

0.75LN5嘉泰姆

5LN5嘉泰姆

400LN5嘉泰姆

CXSD62110LN5嘉泰姆

QFN3x3-20LN5嘉泰姆

TQFN3x3-16LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

2LN5嘉泰姆

20LN5嘉泰姆

3LN5嘉泰姆

28LN5嘉泰姆

1.8|1.5|0.5LN5嘉泰姆

5LN5嘉泰姆

740LN5嘉泰姆

CXSD62111LN5嘉泰姆

TQFN4x4-24LN5嘉泰姆

|QFN3x3-20LN5嘉泰姆

CMLN5嘉泰姆

1LN5嘉泰姆

2LN5嘉泰姆

15LN5嘉泰姆

5LN5嘉泰姆

28LN5嘉泰姆

0.5LN5嘉泰姆

NLN5嘉泰姆

3000LN5嘉泰姆

CXSD62112LN5嘉泰姆

TDFN3x3-10LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

1LN5嘉泰姆

20LN5嘉泰姆

1.8LN5嘉泰姆

28LN5嘉泰姆

0.5LN5嘉泰姆

5LN5嘉泰姆

250LN5嘉泰姆

CXSD62113|CLN5嘉泰姆

TQFN3x3-20LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

2LN5嘉泰姆

15LN5嘉泰姆

6LN5嘉泰姆

25LN5嘉泰姆

2LN5嘉泰姆

NLN5嘉泰姆

550LN5嘉泰姆

CXSD62113ELN5嘉泰姆

TQFN 3x3 20LN5嘉泰姆

COTLN5嘉泰姆

2LN5嘉泰姆

2LN5嘉泰姆

11LN5嘉泰姆

6LN5嘉泰姆

25LN5嘉泰姆

2LN5嘉泰姆

NLN5嘉泰姆

550LN5嘉泰姆

CXSD62114LN5嘉泰姆

TQFN3x3-20LN5嘉泰姆

COTLN5嘉泰姆

2LN5嘉泰姆

2LN5嘉泰姆

11LN5嘉泰姆

5.5LN5嘉泰姆

25LN5嘉泰姆

2LN5嘉泰姆

NLN5嘉泰姆

280LN5嘉泰姆

CXSD62115LN5嘉泰姆

QFN4x4-24LN5嘉泰姆

VMLN5嘉泰姆

2LN5嘉泰姆

1LN5嘉泰姆

60LN5嘉泰姆

3.1LN5嘉泰姆

13.2LN5嘉泰姆

0.85LN5嘉泰姆

12LN5嘉泰姆

5000LN5嘉泰姆

CXSD62116A|B|CLN5嘉泰姆

SOP-8PLN5嘉泰姆

VMLN5嘉泰姆

1LN5嘉泰姆

1LN5嘉泰姆

20LN5嘉泰姆

2.9LN5嘉泰姆

13.2LN5嘉泰姆

0.8LN5嘉泰姆

12LN5嘉泰姆

16000LN5嘉泰姆

CXSD62117LN5嘉泰姆

SOP-20LN5嘉泰姆

VMLN5嘉泰姆

2LN5嘉泰姆

2LN5嘉泰姆

30LN5嘉泰姆

10LN5嘉泰姆

13.2LN5嘉泰姆

1LN5嘉泰姆

12LN5嘉泰姆

5000LN5嘉泰姆

CXSD62118LN5嘉泰姆

TDFN3x3-10LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

1LN5嘉泰姆

25LN5嘉泰姆

1.8LN5嘉泰姆

28LN5嘉泰姆

0.7LN5嘉泰姆

5LN5嘉泰姆

250LN5嘉泰姆

CXSD62119LN5嘉泰姆

TQFN3x3-20LN5嘉泰姆

COTLN5嘉泰姆

2LN5嘉泰姆

1LN5嘉泰姆

40LN5嘉泰姆

1.8LN5嘉泰姆

25LN5嘉泰姆

REFIN SettingLN5嘉泰姆

5LN5嘉泰姆

700LN5嘉泰姆

CXSD62120LN5嘉泰姆

QFN 3x3 20LN5嘉泰姆

TQFN 3x3 16LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

2LN5嘉泰姆

20LN5嘉泰姆

3LN5嘉泰姆

28LN5嘉泰姆

1.8|1.5 1.35|1.2 0.5LN5嘉泰姆

5LN5嘉泰姆

800LN5嘉泰姆

CXSD62121ALN5嘉泰姆

TQFN3x3 20LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

2LN5嘉泰姆

15LN5嘉泰姆

3LN5嘉泰姆

28LN5嘉泰姆

0.75LN5嘉泰姆

5LN5嘉泰姆

220LN5嘉泰姆

CXSD62121BLN5嘉泰姆

TQFN3x3 20LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

2LN5嘉泰姆

15LN5嘉泰姆

3LN5嘉泰姆

28LN5嘉泰姆

0.75LN5嘉泰姆

5LN5嘉泰姆

220LN5嘉泰姆

CXSD62121LN5嘉泰姆

TQFN3x3-20LN5嘉泰姆

COTLN5嘉泰姆

1LN5嘉泰姆

2LN5嘉泰姆

20LN5嘉泰姆

3LN5嘉泰姆

28LN5嘉泰姆

0.75LN5嘉泰姆

5LN5嘉泰姆

180LN5嘉泰姆

 LN5嘉泰姆

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