The CXSD6275, two-phase PWM control IC, provides a precision voltage regulation system for advanced graphic microprocessors in graphics card applications. The integration of power MOSFET drivers into the controller
IC and reduces the number of external parts for a cost and space saving power management solution.
The CXSD6275 uses a voltage-mode PWM architecture,operating with fixed-frequency, to provides excellent load transient response. The device uses the voltage across the DCRs of the inductors for current sensing. Load line
voltage positioning (DROOP), channel-current balance,and over-current protection are accomplished through continuous inductor DCR current sensing.
The MODE pin programs single- or two- phase operation.When IC operates in two-phase mode normally, it can transfer two-phase mode to single-phase mode at liberty.Nevertheless, once operates in single-phase mode, the operation mode is latched. It is required to toggle SS,REFIN/EN or 5VCC pin to reset the IC. Such feature of the MODE pin makes the CXSD6275 ideally suitable for dual
power input applications, such as PCIE interfaced graphic cards.This control IC‘s protection features include a set of sophisticated over-temperature, over-voltage, under-voltage, and over-current protections. Over-voltage re-sults in the converter turning the lower MOSFETs on to clamp the rising output voltage and protects the
microprocessor. The over-current protection level is set through external resistors. The device also provides a power-on-reset function and a programmable soft-start
to prevent wrong operation and limit the input surge current during power-on or start-up.
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目录
1.产品概述 2.产品特点
3.应用范围 4.下载产品资料PDF文档
5.产品封装图 6.电路原理图
7.功能概述 8.相关产品
一,产品概述(General Description)
The CXSD6275, two-phase PWM control IC, provides a precision voltage regulation system for advanced graphic microprocessors in graphics card applications. The integration of power MOSFET drivers into the controller
IC and reduces the number of external parts for a cost and space saving power management solution.
The CXSD6275 uses a voltage-mode PWM architecture,operating with fixed-frequency, to provides excellent load transient response. The device uses the voltage across the DCRs of the inductors for current sensing. Load line
voltage positioning (DROOP), channel-current balance,and over-current protection are accomplished through continuous inductor DCR current sensing.
The MODE pin programs single- or two- phase operation.When IC operates in two-phase mode normally, it can transfer two-phase mode to single-phase mode at liberty.Nevertheless, once operates in single-phase mode, the operation mode is latched. It is required to toggle SS,REFIN/EN or 5VCC pin to reset the IC. Such feature of the MODE pin makes the CXSD6275 ideally suitable for dual
power input applications, such as PCIE interfaced graphic cards.This control IC‘s protection features include a set of sophisticated over-temperature, over-voltage, under-voltage, and over-current protections. Over-voltage re-sults in the converter turning the lower MOSFETs on to clamp the rising output voltage and protects the
microprocessor. The over-current protection level is set through external resistors. The device also provides a power-on-reset function and a programmable soft-start
to prevent wrong operation and limit the input surge current during power-on or start-up.
The CXSD6275 is available in a QFN4x4-24A package
二.产品特点(Features)
1.）Voltage-Mode Operation with Current Sharing
Adjustable Feedback Compensation
Fast Load Transient Response
2.）Operate with 8V~13.2VCC Supply Voltage
3.）Selectable External or Internal 0.6V Reference
±1.5% Accuracy Over Temperature
4.）Support Single- and Two-Phase Operations
5.）5VCC and Buffered Reference Outputs
6.）8~12V Gate Drivers with Internal Bootstrap Diode
7.）Lossless Inductor DCR Current Sensing
8.）Selectable Operation Frequency
150k/300k/400kHz per Phase
9.）Power-OK Indicator Output
Regulated 1.5V on REFOUT/POK
10.）Adjustable Over-Current Protection (OCP)
11.）Accurate Load Line (DROOP) Programming
12.）Adjustable Soft-Start
13.）Over-Voltage Protection (OVP)
14.）Under-Voltage Protection (UVP)
15.）Over-Temperature Protection (OTP)
16.）QFN4x4 24-Lead Package (QFN4x4-24A)
17.）Lead Free and Green Devices Available (RoHS Compliant)
三,应用范围 (Applications)
Graphics Card GPU Core Power Supply
Motherboard Chipset or DDR SDRAM Core PowerSupply
On-board High Power PWM Converter with Out-
put Current up to 60A
四.下载产品资料PDF文档
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！
五,产品封装图 (Package)
FUNCTION
|
PIN |
FUNCTION |
|
|
NO. |
NAME |
|
|
1 |
UGATE1 |
High-side Gate Driver Output for channel 1. Connect this pin to the gate of high-side MOSFET. This pin is monitored by the adaptive shoot-through protection circuitry to determine when the high-side MOSFET has turned off. |
|
2 |
BOOT1 |
Bootstrap Supply for the floating high-side gate driver of channel 1. Connect the Bootstrap capacitor between the BOOT1 pin and the PHASE1 pin to form a bootstrap circuit. The bootstrap capacitor provides the charge to turn on the high-side MOSFET. Typical values for CBOOT ranged from 0.1μF to 1μF. Ensure that CBOOT is placed near the IC. |
|
3 |
5VCC |
Internal Regulator Output. This is the output pin of the linear regulator, which is converting power from VCC and provides output current up to 20mA minimums for internal bias and external usage. |
|
4 |
AGND |
Signal Ground for the IC. All voltage levels are measured with respect to this pin. Tie this pin to the ground island/plane through the lowest impedance connection available. |
|
5 |
MODE |
Operation Phase Selection Input. Pulling this pin lower than 0.64V sets two-phase operation with both channels enabled. Pulling this pin higher than 0.8V sets single-phase operation with the channel 2 disabled. Once operating in single-phase mode, the operation mode is latched. It is required to toggle SS, REFIN/EN, or 5VCC pin to reset the IC. |
|
6 |
CSP1 |
Positive Input of current sensing Amplifier for channel 1. This pin combined with CSN1 senses the inductor current through an RC network. |
|
7 |
CSN1 |
Negative Input of current sensing amplifier for channel 1. This pin combined with CSP1 senses the inductor current through an RC network. |
|
8 |
CSN2 |
Negative Input of current sensing amplifier for channel 2. This pin combined with CSP2 senses the inductor current through an RC network. |
|
9 |
CSP2 |
Positive Input of current sensing Amplifier for Channel 2. This pin combined with CSN2 senses the inductor current through an RC network. |
|
PIN |
FUNCTION |
||
|
NO. |
NAME |
||
|
10 |
DROOP |
Load Line (droop) Setting. Connect a resistor between this pin and AGND to set the droop. A |
|
|
11 |
RT |
Operating Frequency Setting. The three-level input pin sets the operating frequency for each |
|
|
RT |
Operating Frequency (kHz) |
||
|
GND |
150 |
||
|
Floating |
300 |
||
|
5VCC |
400 |
||
|
12 |
COMP |
Error Amplifier Output. Connect the compensation network between COMP, FB, and VOUT for Type |
|
|
13 |
FB |
Feedback Voltage. This pin is the inverting input to the error comparator. A resistor divider from |
|
|
14 |
SS |
Soft-start Current Output. Connect a capacitor from this pin to the AGND to set the soft-start |
|
|
15 |
REFIN/EN |
External Reference and Enable Input. The IC uses the voltage (VREFIN/EN) as reference voltage of |
|
|
16 |
REFOUT/PO |
Power-OK and 1.5V Reference Output. This pin is a reference output used to indicate the status |
|
|
17 |
BOOT2 |
Bootstrap Supply for the floating high-side gate driver of channel 2. Connect the Bootstrap |
|
|
18 |
UGATE2 |
High-side Gate Driver Output for Channel 2. Connect this pin to the gate of high-side MOSFET. |
|
|
19 |
PHASE2 |
Switch Node for Channel 2. Connect this pin to the source of high-side MOSFET and the drain of |
|
|
20 |
LGATE2 |
Low-side Gate Driver Output for Channel 2. Connect this pin to the gate of low-side MOSFET. |
|
|
21 |
VCCDRV |
Drive for External Linear Regulator. This pin is the drive output for the external linear regulator. |
|
|
22 |
VCC |
Supply Voltage. This pin along with VCCDRV pin and external pass element provides 8.5V |
|
|
23 |
LGATE1 |
Low-side Gate Driver Output for Channel 1. Connect this pin to the gate of low-side MOSFET. |
|
|
PIN |
FUNCTION |
|
|
NO. |
NAME |
|
|
24 |
PHASE1 |
Switch Node for Channel 1. Connect this pin to the source of high-side MOSFET and the drain of the low-side MOSFET. This pin is used as sink for UGATT1 driver. This pin is also monitored by the adaptive shoot-through protection circuitry to determine when the high-side MOSFET has turned off. An Schottky diode between this pin and the ground is recommended to reduce negative transient voltage, which is common in a power supply system. |
|
25 |
PGND |
Power Ground for the low-side gate drivers. Connect this pin to the source of low-side MOSFETs. This pin is used as sink for LGATE1 and LGATE2 drivers. |
六.电路原理图
八,相关产品 更多同类产品......
|
Switching Regulator > Buck Controller |
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|
Part_No |
Package |
Archi tectu |
Phase |
No.of PWM Output |
Output Current (A) |
Input Voltage (V) |
Reference Voltage (V) |
Bias Voltage (V) |
Quiescent Current (uA) |
|
|
min |
max |
|||||||||
|
SOP-14 QSOP-16 QFN4x4-16 |
VM |
1 |
1 |
30 |
2.9 |
13.2 |
0.9 |
12 |
8000 |
|
|
SOP-8 |
VM |
1 |
1 |
20 |
2.9 |
13.2 |
0.8 |
12 |
5000 |
|
|
SOP-8 |
VM |
1 |
1 |
20 |
2.9 |
13.2 |
0.8 |
12 |
5000 |
|
|
QFN4x4-24 |
VM |
2 |
1 |
60 |
3.1 |
13.2 |
0.6 |
12 |
5000 |
|
|
SOP-8 |
VM |
1 |
1 |
20 |
2.2 |
13.2 |
0.8 |
5~12 |
2100 |
|
|
SOP-8 |
VM |
1 |
1 |
20 |
2.2 |
13.2 |
0.8 |
5~12 |
2100 |
|
|
SOP8|TSSOP8 |
VM |
1 |
1 |
5 |
5 |
13.2 |
1.25|0.8 |
5~12 |
3000 |
|
|
SOP-8 |
VM |
1 |
1 |
10 |
||||||
