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

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

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

产品特点(Features)BiP嘉泰姆

High Input Voltages Range from 3V to 28V Input PowerBiP嘉泰姆
Provide Adjustable Output Voltage from 0.75V toBiP嘉泰姆
5.5V +1% Accuracy over TemperatureBiP嘉泰姆
Integrated MOSFET Drivers and Bootstrap Forward P-CH MOSFETBiP嘉泰姆
Low Quiescent Current (200μA)BiP嘉泰姆
Excellent Line and Load Transient ResponsesBiP嘉泰姆
PFM Mode for Increased Light Load EfficiencyBiP嘉泰姆
Constant On-Time Controller SchemeBiP嘉泰姆
- Switching Frequency Compensation for PWM ModeBiP嘉泰姆
- Adjustable Switching Frequency from 100kHz toBiP嘉泰姆
550kHz in PWM Mode with DC Output CurrentBiP嘉泰姆
S3 and S5 Pins Control The Device in S0, S3 or S4/S5 StateBiP嘉泰姆
Power Good MonitoringBiP嘉泰姆
Extra Droop Voltage Control Function withBiP嘉泰姆
Adjustable Current SettingBiP嘉泰姆
70% Under-Voltage Protection (UVP)BiP嘉泰姆
125% Over-Voltage Protection (OVP)BiP嘉泰姆
Adjustable Current-Limit ProtectionBiP嘉泰姆
- Using Sense Low-Side MOSFET’s RDS(ON)BiP嘉泰姆
TQFN-20 3mmx3mm Thin packageBiP嘉泰姆
Lead Free Available (RoHS Compliant)BiP嘉泰姆
+1.5A LDO Section (VTT)BiP嘉泰姆
Sourcing or Sinking Current up to 1.5ABiP嘉泰姆
Fast Transient Response for Output VoltageBiP嘉泰姆
Output Ceramic Capacitors Support at least 10μMLCCBiP嘉泰姆
VTT and VTTREF Track at Half the VDDQSNS by internal dividerBiP嘉泰姆
+20mV Accuracy for VTT and VTTREFBiP嘉泰姆
Independent Over-Current Limit (OCL)BiP嘉泰姆
Thermal Shutdown ProtectionBiP嘉泰姆
三,应用范围 (Applications)BiP嘉泰姆


DDR2, and DDR3 Memory Power SuppliesBiP嘉泰姆
SSTL-2 SSTL-18 and HSTL TerminationBiP嘉泰姆
四.下载产品资料PDF文档 BiP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BiP嘉泰姆

 QQ截图20160419174301.jpgBiP嘉泰姆

五,产品封装图 (Package)BiP嘉泰姆


blob.pngBiP嘉泰姆
六.电路原理图BiP嘉泰姆


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七,功能概述BiP嘉泰姆


Soft- Start (cont.)BiP嘉泰姆

During soft-start stage before the PGOOD pin is ready,BiP嘉泰姆
the under voltage protection is prohibited. The over volt-BiP嘉泰姆
age and current limit protection functions are enabled. IfBiP嘉泰姆
the output capacitor has residue voltage before startup,BiP嘉泰姆
both low-side and high-side MOSFETs are in off-stateBiP嘉泰姆
until the internal digital soft start voltage equal the inter-BiP嘉泰姆
nal feedback voltage. This will ensure the output voltageBiP嘉泰姆
starts from its existing voltage level.BiP嘉泰姆
The VTT LDO part monitors the output current, both sourc-BiP嘉泰姆
ing and sinking current, and limits the maximum outputBiP嘉泰姆
current to prevent damages during current overload orBiP嘉泰姆
short circuit (shorted from VTT to GND or VLDOIN)BiP嘉泰姆
conditions.BiP嘉泰姆
The VTT LDO provides a soft-start function, using theBiP嘉泰姆
constant current to charge the output capacitor that givesBiP嘉泰姆
a rapid and linear output voltage rise. If the load current isBiP嘉泰姆
above the current limit start-up, the VTT cannot startBiP嘉泰姆
successfully.CXSD62121A CXSD62121B CXSD62121 has an independent counter for each output,BiP嘉泰姆
but the PGOOD signal indicates only the status of VDDQBiP嘉泰姆
and does not indicate VTT power good externally.BiP嘉泰姆
Power-Good Output (PGOOD)BiP嘉泰姆
PGOOD is an open-drain output and the PGOOD com-BiP嘉泰姆
parator continuously monitors the output voltage. PGOODBiP嘉泰姆
is actively held low in shutdown, and standby. When PWMBiP嘉泰姆
converter’s output voltage is greater than 95% of its tar-BiP嘉泰姆
get value, the internal open-drain device will be pulledBiP嘉泰姆
low. After 63μs debounce time, the PGOOD goes high.BiP嘉泰姆
The PGOOD goes low if VVDDQ output is 10% below orBiP嘉泰姆
above its nominal regulation point.BiP嘉泰姆
Under Voltage ProtectionBiP嘉泰姆
In the process of operation, if a short-circuit occurs, theBiP嘉泰姆
output voltage will drop quickly. When load current is big-BiP嘉泰姆
ger than current limit threshold value, the output voltageBiP嘉泰姆
will fall out of the required regulation range. The under-BiP嘉泰姆
voltage continually monitors the setting output voltageBiP嘉泰姆
after 2ms of PWM operations to ensure startup. If a loadBiP嘉泰姆
step is strong enough to pull the output voltage lowerBiP嘉泰姆
than the under voltage threshold (70% of normal outputBiP嘉泰姆
voltage), CXSD62121A CXSD62121B CXSD62121 shuts down the output gradually andBiP嘉泰姆
latches off both high and low side MOSFETs.BiP嘉泰姆
Over Voltage Protection (OVP)BiP嘉泰姆
The feedback voltage should increase over 125% of theBiP嘉泰姆
reference voltage due to the high-side MOSFET failure orBiP嘉泰姆
for other reasons, and the over voltage protection com-BiP嘉泰姆
parator designed with a 1.5μs noise filter will force theBiP嘉泰姆
low-side MOSFET gate driver to be high. This action ac-BiP嘉泰姆
tively pulls down the output voltage and eventually at-BiP嘉泰姆
tempts to blow the battery fuse.BiP嘉泰姆
When the OVP occurs, the PGOOD pin will pull down andBiP嘉泰姆
latch-off the converter. This OVP scheme only clamps theBiP嘉泰姆
voltage overshoot, and does not invert the output voltageBiP嘉泰姆
when otherwise activated with a continuously high outputBiP嘉泰姆
from low-side MOSFET driver. It’s a common problem forBiP嘉泰姆
OVP schemes with a latch. Once an over-voltage faultBiP嘉泰姆
condition is set, toggling VCC power-on-reset signal canBiP嘉泰姆
only reset it.BiP嘉泰姆
PWM Converter Current LimitBiP嘉泰姆
The current-limit circuit employs a unique “valley” currentBiP嘉泰姆
sensing algorithm (Figure 2). CS pin should be con-BiP嘉泰姆
nected to VCC through the trip voltage-setting resistor,BiP嘉泰姆
RCS. CS terminal sinks 5mA current, ICS, and the currentBiP嘉泰姆
limit threshold is set to the voltage across the RCS. TheBiP嘉泰姆
voltage between or CS_GND pin and PHASE pin moni-BiP嘉泰姆
tors the inductor current so that PHASE pin should beBiP嘉泰姆
connected to the drain terminal of the low side MOSFET.BiP嘉泰姆
PGND is used as the positive current sensing node soBiP嘉泰姆
that PGND should be connected to the proper currentBiP嘉泰姆
sensing device, i.e. the sense resistor or the source ter-BiP嘉泰姆
minal of the low side MOSFET.BiP嘉泰姆
If the magnitude of the current-sense signal is above theBiP嘉泰姆
current-limit threshold, the PWM is not allowed to initiateBiP嘉泰姆
a new cycle. The actual peak current is greater than theBiP嘉泰姆
current-limit threshold by an amount equal to the induc-BiP嘉泰姆
tor ripple current. Therefore, the exact current- limit char-BiP嘉泰姆
acteristic and maximum load capability are a function ofBiP嘉泰姆
the sense resistance, inductor value, and input voltage.BiP嘉泰姆
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25BiP嘉泰姆

3BiP嘉泰姆

13.2BiP嘉泰姆

0.6|0.8BiP嘉泰姆

5~12BiP嘉泰姆

1200BiP嘉泰姆

CXSD6297BiP嘉泰姆

TDFN3x3-10BiP嘉泰姆

VMBiP嘉泰姆

1BiP嘉泰姆

1BiP嘉泰姆

25BiP嘉泰姆

4BiP嘉泰姆

13.2BiP嘉泰姆

0.8BiP嘉泰姆

5~12BiP嘉泰姆

2000BiP嘉泰姆

CXSD6298BiP嘉泰姆

TDFN3x3-10BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

1BiP嘉泰姆

25BiP嘉泰姆

4.5BiP嘉泰姆

25BiP嘉泰姆

0.6BiP嘉泰姆

5~12BiP嘉泰姆

80BiP嘉泰姆

CXSD6299|ABiP嘉泰姆

SOP-8PBiP嘉泰姆

VMBiP嘉泰姆

1BiP嘉泰姆

1BiP嘉泰姆

25BiP嘉泰姆

4.5BiP嘉泰姆

13.2BiP嘉泰姆

0.8BiP嘉泰姆

5~12BiP嘉泰姆

16000BiP嘉泰姆

CXSD62100BiP嘉泰姆

TQFN3x3-10BiP嘉泰姆

VMBiP嘉泰姆

1BiP嘉泰姆

1BiP嘉泰姆

25BiP嘉泰姆

4.5BiP嘉泰姆

13.2BiP嘉泰姆

0.6BiP嘉泰姆

5~12BiP嘉泰姆

2500BiP嘉泰姆

CXSD62101|LBiP嘉泰姆

TDFN3x3-10BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

1BiP嘉泰姆

30BiP嘉泰姆

3BiP嘉泰姆

25BiP嘉泰姆

0.8BiP嘉泰姆

5~12BiP嘉泰姆

2000BiP嘉泰姆

CXSD62102BiP嘉泰姆

TQFN3x3-16BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

1BiP嘉泰姆

30BiP嘉泰姆

1.8BiP嘉泰姆

28BiP嘉泰姆

0.6BiP嘉泰姆

5BiP嘉泰姆

600BiP嘉泰姆

CXSD62102ABiP嘉泰姆

TQFN 3x3 16BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

1BiP嘉泰姆

30BiP嘉泰姆

1.8BiP嘉泰姆

28BiP嘉泰姆

0.6BiP嘉泰姆

5BiP嘉泰姆

600BiP嘉泰姆

CXSD62103BiP嘉泰姆

QFN4x4-24BiP嘉泰姆

VMBiP嘉泰姆

2BiP嘉泰姆

1BiP嘉泰姆

50BiP嘉泰姆

4.5BiP嘉泰姆

13.2BiP嘉泰姆

0.6BiP嘉泰姆

5~12BiP嘉泰姆

5000BiP嘉泰姆

CXSD62104BiP嘉泰姆

TQFN4x4-24BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

2BiP嘉泰姆

15BiP嘉泰姆

6BiP嘉泰姆

25BiP嘉泰姆

2BiP嘉泰姆

NBiP嘉泰姆

550BiP嘉泰姆

CXSD62105BiP嘉泰姆

TQFN4x4-24BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

2BiP嘉泰姆

15BiP嘉泰姆

6BiP嘉泰姆

25BiP嘉泰姆

2BiP嘉泰姆

NBiP嘉泰姆

550BiP嘉泰姆

CXSD62106|ABiP嘉泰姆

TQFN4x4-4BiP嘉泰姆

TQFN3x3-20BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

2BiP嘉泰姆

20BiP嘉泰姆

3BiP嘉泰姆

28BiP嘉泰姆

0.75BiP嘉泰姆

5BiP嘉泰姆

800BiP嘉泰姆

CXSD62107BiP嘉泰姆

TQFN3x3-16BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

1BiP嘉泰姆

20BiP嘉泰姆

1.8BiP嘉泰姆

28BiP嘉泰姆

0.75BiP嘉泰姆

5BiP嘉泰姆

400BiP嘉泰姆

CXSD62108BiP嘉泰姆

QFN3.5x3.5-14BiP嘉泰姆

TQFN3x3-16BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

1BiP嘉泰姆

20BiP嘉泰姆

1.8BiP嘉泰姆

28BiP嘉泰姆

0.75BiP嘉泰姆

5BiP嘉泰姆

400BiP嘉泰姆

CXSD62109BiP嘉泰姆

TQFN3x3-16BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

2BiP嘉泰姆

20BiP嘉泰姆

1.8BiP嘉泰姆

28BiP嘉泰姆

0.75BiP嘉泰姆

5BiP嘉泰姆

400BiP嘉泰姆

CXSD62110BiP嘉泰姆

QFN3x3-20BiP嘉泰姆

TQFN3x3-16BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

2BiP嘉泰姆

20BiP嘉泰姆

3BiP嘉泰姆

28BiP嘉泰姆

1.8|1.5|0.5BiP嘉泰姆

5BiP嘉泰姆

740BiP嘉泰姆

CXSD62111BiP嘉泰姆

TQFN4x4-24BiP嘉泰姆

|QFN3x3-20BiP嘉泰姆

CMBiP嘉泰姆

1BiP嘉泰姆

2BiP嘉泰姆

15BiP嘉泰姆

5BiP嘉泰姆

28BiP嘉泰姆

0.5BiP嘉泰姆

NBiP嘉泰姆

3000BiP嘉泰姆

CXSD62112BiP嘉泰姆

TDFN3x3-10BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

1BiP嘉泰姆

20BiP嘉泰姆

1.8BiP嘉泰姆

28BiP嘉泰姆

0.5BiP嘉泰姆

5BiP嘉泰姆

250BiP嘉泰姆

CXSD62113|CBiP嘉泰姆

TQFN3x3-20BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

2BiP嘉泰姆

15BiP嘉泰姆

6BiP嘉泰姆

25BiP嘉泰姆

2BiP嘉泰姆

NBiP嘉泰姆

550BiP嘉泰姆

CXSD62113EBiP嘉泰姆

TQFN 3x3 20BiP嘉泰姆

COTBiP嘉泰姆

2BiP嘉泰姆

2BiP嘉泰姆

11BiP嘉泰姆

6BiP嘉泰姆

25BiP嘉泰姆

2BiP嘉泰姆

NBiP嘉泰姆

550BiP嘉泰姆

CXSD62114BiP嘉泰姆

TQFN3x3-20BiP嘉泰姆

COTBiP嘉泰姆

2BiP嘉泰姆

2BiP嘉泰姆

11BiP嘉泰姆

5.5BiP嘉泰姆

25BiP嘉泰姆

2BiP嘉泰姆

NBiP嘉泰姆

280BiP嘉泰姆

CXSD62115BiP嘉泰姆

QFN4x4-24BiP嘉泰姆

VMBiP嘉泰姆

2BiP嘉泰姆

1BiP嘉泰姆

60BiP嘉泰姆

3.1BiP嘉泰姆

13.2BiP嘉泰姆

0.85BiP嘉泰姆

12BiP嘉泰姆

5000BiP嘉泰姆

CXSD62116A|B|CBiP嘉泰姆

SOP-8PBiP嘉泰姆

VMBiP嘉泰姆

1BiP嘉泰姆

1BiP嘉泰姆

20BiP嘉泰姆

2.9BiP嘉泰姆

13.2BiP嘉泰姆

0.8BiP嘉泰姆

12BiP嘉泰姆

16000BiP嘉泰姆

CXSD62117BiP嘉泰姆

SOP-20BiP嘉泰姆

VMBiP嘉泰姆

2BiP嘉泰姆

2BiP嘉泰姆

30BiP嘉泰姆

10BiP嘉泰姆

13.2BiP嘉泰姆

1BiP嘉泰姆

12BiP嘉泰姆

5000BiP嘉泰姆

CXSD62118BiP嘉泰姆

TDFN3x3-10BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

1BiP嘉泰姆

25BiP嘉泰姆

1.8BiP嘉泰姆

28BiP嘉泰姆

0.7BiP嘉泰姆

5BiP嘉泰姆

250BiP嘉泰姆

CXSD62119BiP嘉泰姆

TQFN3x3-20BiP嘉泰姆

COTBiP嘉泰姆

2BiP嘉泰姆

1BiP嘉泰姆

40BiP嘉泰姆

1.8BiP嘉泰姆

25BiP嘉泰姆

REFIN SettingBiP嘉泰姆

5BiP嘉泰姆

700BiP嘉泰姆

CXSD62120BiP嘉泰姆

QFN 3x3 20BiP嘉泰姆

TQFN 3x3 16BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

2BiP嘉泰姆

20BiP嘉泰姆

3BiP嘉泰姆

28BiP嘉泰姆

1.8|1.5 1.35|1.2 0.5BiP嘉泰姆

5BiP嘉泰姆

800BiP嘉泰姆

CXSD62121ABiP嘉泰姆

TQFN3x3 20BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

2BiP嘉泰姆

15BiP嘉泰姆

3BiP嘉泰姆

28BiP嘉泰姆

0.75BiP嘉泰姆

5BiP嘉泰姆

220BiP嘉泰姆

CXSD62121BBiP嘉泰姆

TQFN3x3 20BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

2BiP嘉泰姆

15BiP嘉泰姆

3BiP嘉泰姆

28BiP嘉泰姆

0.75BiP嘉泰姆

5BiP嘉泰姆

220BiP嘉泰姆

CXSD62121BiP嘉泰姆

TQFN3x3-20BiP嘉泰姆

COTBiP嘉泰姆

1BiP嘉泰姆

2BiP嘉泰姆

20BiP嘉泰姆

3BiP嘉泰姆

28BiP嘉泰姆

0.75BiP嘉泰姆

5BiP嘉泰姆

180BiP嘉泰姆

 BiP嘉泰姆

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