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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 >CXSD62121B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
CXSD62121B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
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CXSD62121B配备了精确的电流限制、输出欠压和输出过压保护。通电复位功能可监控VCC上的电压,防止通电期间出现错误操作。在轻载期间,允许下垂功能调整输出电压

CXSD62121B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
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目录B5A嘉泰姆

1.产品概述                       2.产品特点B5A嘉泰姆
3.应用范围                       4.下载产品资料PDF文档 B5A嘉泰姆
5.产品封装图                     6.电路原理图                   B5A嘉泰姆
7.功能概述                        8.相关产品B5A嘉泰姆

一,产品概述(General Description)  B5A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                                                         B5A嘉泰姆

产品特点(Features)B5A嘉泰姆

High Input Voltages Range from 3V to 28V Input PowerB5A嘉泰姆
Provide Adjustable Output Voltage from 0.75V toB5A嘉泰姆
5.5V +1% Accuracy over TemperatureB5A嘉泰姆
Integrated MOSFET Drivers and Bootstrap Forward P-CH MOSFETB5A嘉泰姆
Low Quiescent Current (200μA)B5A嘉泰姆
Excellent Line and Load Transient ResponsesB5A嘉泰姆
PFM Mode for Increased Light Load EfficiencyB5A嘉泰姆
Constant On-Time Controller SchemeB5A嘉泰姆
- Switching Frequency Compensation for PWM ModeB5A嘉泰姆
- Adjustable Switching Frequency from 100kHz toB5A嘉泰姆
550kHz in PWM Mode with DC Output CurrentB5A嘉泰姆
S3 and S5 Pins Control The Device in S0, S3 or S4/S5 StateB5A嘉泰姆
Power Good MonitoringB5A嘉泰姆
Extra Droop Voltage Control Function withB5A嘉泰姆
Adjustable Current SettingB5A嘉泰姆
70% Under-Voltage Protection (UVP)B5A嘉泰姆
125% Over-Voltage Protection (OVP)B5A嘉泰姆
Adjustable Current-Limit ProtectionB5A嘉泰姆
- Using Sense Low-Side MOSFET’s RDS(ON)B5A嘉泰姆
TQFN-20 3mmx3mm Thin packageB5A嘉泰姆
Lead Free Available (RoHS Compliant)B5A嘉泰姆
+1.5A LDO Section (VTT)B5A嘉泰姆
Sourcing or Sinking Current up to 1.5AB5A嘉泰姆
Fast Transient Response for Output VoltageB5A嘉泰姆
Output Ceramic Capacitors Support at least 10μMLCCB5A嘉泰姆
VTT and VTTREF Track at Half the VDDQSNS by internal dividerB5A嘉泰姆
+20mV Accuracy for VTT and VTTREFB5A嘉泰姆
Independent Over-Current Limit (OCL)B5A嘉泰姆
Thermal Shutdown ProtectionB5A嘉泰姆
三,应用范围 (Applications)B5A嘉泰姆


DDR2, and DDR3 Memory Power SuppliesB5A嘉泰姆
SSTL-2 SSTL-18 and HSTL TerminationB5A嘉泰姆
四.下载产品资料PDF文档 B5A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B5A嘉泰姆

 QQ截图20160419174301.jpgB5A嘉泰姆

五,产品封装图 (Package)B5A嘉泰姆


blob.pngB5A嘉泰姆
六.电路原理图B5A嘉泰姆


blob.pngB5A嘉泰姆

七,功能概述B5A嘉泰姆


Soft- Start (cont.)B5A嘉泰姆

During soft-start stage before the PGOOD pin is ready,B5A嘉泰姆
the under voltage protection is prohibited. The over volt-B5A嘉泰姆
age and current limit protection functions are enabled. IfB5A嘉泰姆
the output capacitor has residue voltage before startup,B5A嘉泰姆
both low-side and high-side MOSFETs are in off-stateB5A嘉泰姆
until the internal digital soft start voltage equal the inter-B5A嘉泰姆
nal feedback voltage. This will ensure the output voltageB5A嘉泰姆
starts from its existing voltage level.B5A嘉泰姆
The VTT LDO part monitors the output current, both sourc-B5A嘉泰姆
ing and sinking current, and limits the maximum outputB5A嘉泰姆
current to prevent damages during current overload orB5A嘉泰姆
short circuit (shorted from VTT to GND or VLDOIN)B5A嘉泰姆
conditions.B5A嘉泰姆
The VTT LDO provides a soft-start function, using theB5A嘉泰姆
constant current to charge the output capacitor that givesB5A嘉泰姆
a rapid and linear output voltage rise. If the load current isB5A嘉泰姆
above the current limit start-up, the VTT cannot startB5A嘉泰姆
successfully.CXSD62121A CXSD62121B CXSD62121 has an independent counter for each output,B5A嘉泰姆
but the PGOOD signal indicates only the status of VDDQB5A嘉泰姆
and does not indicate VTT power good externally.B5A嘉泰姆
Power-Good Output (PGOOD)B5A嘉泰姆
PGOOD is an open-drain output and the PGOOD com-B5A嘉泰姆
parator continuously monitors the output voltage. PGOODB5A嘉泰姆
is actively held low in shutdown, and standby. When PWMB5A嘉泰姆
converter’s output voltage is greater than 95% of its tar-B5A嘉泰姆
get value, the internal open-drain device will be pulledB5A嘉泰姆
low. After 63μs debounce time, the PGOOD goes high.B5A嘉泰姆
The PGOOD goes low if VVDDQ output is 10% below orB5A嘉泰姆
above its nominal regulation point.B5A嘉泰姆
Under Voltage ProtectionB5A嘉泰姆
In the process of operation, if a short-circuit occurs, theB5A嘉泰姆
output voltage will drop quickly. When load current is big-B5A嘉泰姆
ger than current limit threshold value, the output voltageB5A嘉泰姆
will fall out of the required regulation range. The under-B5A嘉泰姆
voltage continually monitors the setting output voltageB5A嘉泰姆
after 2ms of PWM operations to ensure startup. If a loadB5A嘉泰姆
step is strong enough to pull the output voltage lowerB5A嘉泰姆
than the under voltage threshold (70% of normal outputB5A嘉泰姆
voltage), CXSD62121A CXSD62121B CXSD62121 shuts down the output gradually andB5A嘉泰姆
latches off both high and low side MOSFETs.B5A嘉泰姆
Over Voltage Protection (OVP)B5A嘉泰姆
The feedback voltage should increase over 125% of theB5A嘉泰姆
reference voltage due to the high-side MOSFET failure orB5A嘉泰姆
for other reasons, and the over voltage protection com-B5A嘉泰姆
parator designed with a 1.5μs noise filter will force theB5A嘉泰姆
low-side MOSFET gate driver to be high. This action ac-B5A嘉泰姆
tively pulls down the output voltage and eventually at-B5A嘉泰姆
tempts to blow the battery fuse.B5A嘉泰姆
When the OVP occurs, the PGOOD pin will pull down andB5A嘉泰姆
latch-off the converter. This OVP scheme only clamps theB5A嘉泰姆
voltage overshoot, and does not invert the output voltageB5A嘉泰姆
when otherwise activated with a continuously high outputB5A嘉泰姆
from low-side MOSFET driver. It’s a common problem forB5A嘉泰姆
OVP schemes with a latch. Once an over-voltage faultB5A嘉泰姆
condition is set, toggling VCC power-on-reset signal canB5A嘉泰姆
only reset it.B5A嘉泰姆
PWM Converter Current LimitB5A嘉泰姆
The current-limit circuit employs a unique “valley” currentB5A嘉泰姆
sensing algorithm (Figure 2). CS pin should be con-B5A嘉泰姆
nected to VCC through the trip voltage-setting resistor,B5A嘉泰姆
RCS. CS terminal sinks 5mA current, ICS, and the currentB5A嘉泰姆
limit threshold is set to the voltage across the RCS. TheB5A嘉泰姆
voltage between or CS_GND pin and PHASE pin moni-B5A嘉泰姆
tors the inductor current so that PHASE pin should beB5A嘉泰姆
connected to the drain terminal of the low side MOSFET.B5A嘉泰姆
PGND is used as the positive current sensing node soB5A嘉泰姆
that PGND should be connected to the proper currentB5A嘉泰姆
sensing device, i.e. the sense resistor or the source ter-B5A嘉泰姆
minal of the low side MOSFET.B5A嘉泰姆
If the magnitude of the current-sense signal is above theB5A嘉泰姆
current-limit threshold, the PWM is not allowed to initiateB5A嘉泰姆
a new cycle. The actual peak current is greater than theB5A嘉泰姆
current-limit threshold by an amount equal to the induc-B5A嘉泰姆
tor ripple current. Therefore, the exact current- limit char-B5A嘉泰姆
acteristic and maximum load capability are a function ofB5A嘉泰姆
the sense resistance, inductor value, and input voltage.B5A嘉泰姆
八,相关产品               更多同类产品...... B5A嘉泰姆


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1B5A嘉泰姆

25B5A嘉泰姆

3B5A嘉泰姆

25B5A嘉泰姆

0.5B5A嘉泰姆

5B5A嘉泰姆

350B5A嘉泰姆

CXSD6294B5A嘉泰姆

QFN4x4-24B5A嘉泰姆

CMB5A嘉泰姆

2B5A嘉泰姆

1B5A嘉泰姆

40B5A嘉泰姆

4.5B5A嘉泰姆

13.2B5A嘉泰姆

0.6B5A嘉泰姆

5~12B5A嘉泰姆

4000B5A嘉泰姆

CXSD6295B5A嘉泰姆

SOP8PB5A嘉泰姆

TDFN3x3-10B5A嘉泰姆

VMB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

20B5A嘉泰姆

3B5A嘉泰姆

13.2B5A嘉泰姆

0.8B5A嘉泰姆

5~12B5A嘉泰姆

2500B5A嘉泰姆

CXSD6296A|B|C|DB5A嘉泰姆

SOP8PB5A嘉泰姆

VMB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

25B5A嘉泰姆

3B5A嘉泰姆

13.2B5A嘉泰姆

0.6|0.8B5A嘉泰姆

5~12B5A嘉泰姆

1200B5A嘉泰姆

CXSD6297B5A嘉泰姆

TDFN3x3-10B5A嘉泰姆

VMB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

25B5A嘉泰姆

4B5A嘉泰姆

13.2B5A嘉泰姆

0.8B5A嘉泰姆

5~12B5A嘉泰姆

2000B5A嘉泰姆

CXSD6298B5A嘉泰姆

TDFN3x3-10B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

25B5A嘉泰姆

4.5B5A嘉泰姆

25B5A嘉泰姆

0.6B5A嘉泰姆

5~12B5A嘉泰姆

80B5A嘉泰姆

CXSD6299|AB5A嘉泰姆

SOP-8PB5A嘉泰姆

VMB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

25B5A嘉泰姆

4.5B5A嘉泰姆

13.2B5A嘉泰姆

0.8B5A嘉泰姆

5~12B5A嘉泰姆

16000B5A嘉泰姆

CXSD62100B5A嘉泰姆

TQFN3x3-10B5A嘉泰姆

VMB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

25B5A嘉泰姆

4.5B5A嘉泰姆

13.2B5A嘉泰姆

0.6B5A嘉泰姆

5~12B5A嘉泰姆

2500B5A嘉泰姆

CXSD62101|LB5A嘉泰姆

TDFN3x3-10B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

30B5A嘉泰姆

3B5A嘉泰姆

25B5A嘉泰姆

0.8B5A嘉泰姆

5~12B5A嘉泰姆

2000B5A嘉泰姆

CXSD62102B5A嘉泰姆

TQFN3x3-16B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

30B5A嘉泰姆

1.8B5A嘉泰姆

28B5A嘉泰姆

0.6B5A嘉泰姆

5B5A嘉泰姆

600B5A嘉泰姆

CXSD62102AB5A嘉泰姆

TQFN 3x3 16B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

30B5A嘉泰姆

1.8B5A嘉泰姆

28B5A嘉泰姆

0.6B5A嘉泰姆

5B5A嘉泰姆

600B5A嘉泰姆

CXSD62103B5A嘉泰姆

QFN4x4-24B5A嘉泰姆

VMB5A嘉泰姆

2B5A嘉泰姆

1B5A嘉泰姆

50B5A嘉泰姆

4.5B5A嘉泰姆

13.2B5A嘉泰姆

0.6B5A嘉泰姆

5~12B5A嘉泰姆

5000B5A嘉泰姆

CXSD62104B5A嘉泰姆

TQFN4x4-24B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

2B5A嘉泰姆

15B5A嘉泰姆

6B5A嘉泰姆

25B5A嘉泰姆

2B5A嘉泰姆

NB5A嘉泰姆

550B5A嘉泰姆

CXSD62105B5A嘉泰姆

TQFN4x4-24B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

2B5A嘉泰姆

15B5A嘉泰姆

6B5A嘉泰姆

25B5A嘉泰姆

2B5A嘉泰姆

NB5A嘉泰姆

550B5A嘉泰姆

CXSD62106|AB5A嘉泰姆

TQFN4x4-4B5A嘉泰姆

TQFN3x3-20B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

2B5A嘉泰姆

20B5A嘉泰姆

3B5A嘉泰姆

28B5A嘉泰姆

0.75B5A嘉泰姆

5B5A嘉泰姆

800B5A嘉泰姆

CXSD62107B5A嘉泰姆

TQFN3x3-16B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

20B5A嘉泰姆

1.8B5A嘉泰姆

28B5A嘉泰姆

0.75B5A嘉泰姆

5B5A嘉泰姆

400B5A嘉泰姆

CXSD62108B5A嘉泰姆

QFN3.5x3.5-14B5A嘉泰姆

TQFN3x3-16B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

20B5A嘉泰姆

1.8B5A嘉泰姆

28B5A嘉泰姆

0.75B5A嘉泰姆

5B5A嘉泰姆

400B5A嘉泰姆

CXSD62109B5A嘉泰姆

TQFN3x3-16B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

2B5A嘉泰姆

20B5A嘉泰姆

1.8B5A嘉泰姆

28B5A嘉泰姆

0.75B5A嘉泰姆

5B5A嘉泰姆

400B5A嘉泰姆

CXSD62110B5A嘉泰姆

QFN3x3-20B5A嘉泰姆

TQFN3x3-16B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

2B5A嘉泰姆

20B5A嘉泰姆

3B5A嘉泰姆

28B5A嘉泰姆

1.8|1.5|0.5B5A嘉泰姆

5B5A嘉泰姆

740B5A嘉泰姆

CXSD62111B5A嘉泰姆

TQFN4x4-24B5A嘉泰姆

|QFN3x3-20B5A嘉泰姆

CMB5A嘉泰姆

1B5A嘉泰姆

2B5A嘉泰姆

15B5A嘉泰姆

5B5A嘉泰姆

28B5A嘉泰姆

0.5B5A嘉泰姆

NB5A嘉泰姆

3000B5A嘉泰姆

CXSD62112B5A嘉泰姆

TDFN3x3-10B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

20B5A嘉泰姆

1.8B5A嘉泰姆

28B5A嘉泰姆

0.5B5A嘉泰姆

5B5A嘉泰姆

250B5A嘉泰姆

CXSD62113|CB5A嘉泰姆

TQFN3x3-20B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

2B5A嘉泰姆

15B5A嘉泰姆

6B5A嘉泰姆

25B5A嘉泰姆

2B5A嘉泰姆

NB5A嘉泰姆

550B5A嘉泰姆

CXSD62113EB5A嘉泰姆

TQFN 3x3 20B5A嘉泰姆

COTB5A嘉泰姆

2B5A嘉泰姆

2B5A嘉泰姆

11B5A嘉泰姆

6B5A嘉泰姆

25B5A嘉泰姆

2B5A嘉泰姆

NB5A嘉泰姆

550B5A嘉泰姆

CXSD62114B5A嘉泰姆

TQFN3x3-20B5A嘉泰姆

COTB5A嘉泰姆

2B5A嘉泰姆

2B5A嘉泰姆

11B5A嘉泰姆

5.5B5A嘉泰姆

25B5A嘉泰姆

2B5A嘉泰姆

NB5A嘉泰姆

280B5A嘉泰姆

CXSD62115B5A嘉泰姆

QFN4x4-24B5A嘉泰姆

VMB5A嘉泰姆

2B5A嘉泰姆

1B5A嘉泰姆

60B5A嘉泰姆

3.1B5A嘉泰姆

13.2B5A嘉泰姆

0.85B5A嘉泰姆

12B5A嘉泰姆

5000B5A嘉泰姆

CXSD62116A|B|CB5A嘉泰姆

SOP-8PB5A嘉泰姆

VMB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

20B5A嘉泰姆

2.9B5A嘉泰姆

13.2B5A嘉泰姆

0.8B5A嘉泰姆

12B5A嘉泰姆

16000B5A嘉泰姆

CXSD62117B5A嘉泰姆

SOP-20B5A嘉泰姆

VMB5A嘉泰姆

2B5A嘉泰姆

2B5A嘉泰姆

30B5A嘉泰姆

10B5A嘉泰姆

13.2B5A嘉泰姆

1B5A嘉泰姆

12B5A嘉泰姆

5000B5A嘉泰姆

CXSD62118B5A嘉泰姆

TDFN3x3-10B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

1B5A嘉泰姆

25B5A嘉泰姆

1.8B5A嘉泰姆

28B5A嘉泰姆

0.7B5A嘉泰姆

5B5A嘉泰姆

250B5A嘉泰姆

CXSD62119B5A嘉泰姆

TQFN3x3-20B5A嘉泰姆

COTB5A嘉泰姆

2B5A嘉泰姆

1B5A嘉泰姆

40B5A嘉泰姆

1.8B5A嘉泰姆

25B5A嘉泰姆

REFIN SettingB5A嘉泰姆

5B5A嘉泰姆

700B5A嘉泰姆

CXSD62120B5A嘉泰姆

QFN 3x3 20B5A嘉泰姆

TQFN 3x3 16B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

2B5A嘉泰姆

20B5A嘉泰姆

3B5A嘉泰姆

28B5A嘉泰姆

1.8|1.5 1.35|1.2 0.5B5A嘉泰姆

5B5A嘉泰姆

800B5A嘉泰姆

CXSD62121AB5A嘉泰姆

TQFN3x3 20B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

2B5A嘉泰姆

15B5A嘉泰姆

3B5A嘉泰姆

28B5A嘉泰姆

0.75B5A嘉泰姆

5B5A嘉泰姆

220B5A嘉泰姆

CXSD62121BB5A嘉泰姆

TQFN3x3 20B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

2B5A嘉泰姆

15B5A嘉泰姆

3B5A嘉泰姆

28B5A嘉泰姆

0.75B5A嘉泰姆

5B5A嘉泰姆

220B5A嘉泰姆

CXSD62121B5A嘉泰姆

TQFN3x3-20B5A嘉泰姆

COTB5A嘉泰姆

1B5A嘉泰姆

2B5A嘉泰姆

20B5A嘉泰姆

3B5A嘉泰姆

28B5A嘉泰姆

0.75B5A嘉泰姆

5B5A嘉泰姆

180B5A嘉泰姆

 B5A嘉泰姆

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