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| 型号： | MAX8810AETM+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/50页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR PWM W/MOSFET 48TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 应用： | 控制器，Intel VR10、VR11 |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 1.6 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（6x6） |
| 包装： | 管件 |
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VRD11/VRD10, K8 Rev F 2/3/4-Phase PWM
Controllers with Integrated Dual MOSFET Drivers
V C = × R SENSE CA
× G
in a constant output current limit over the entire opera-
tional temperature range. This eliminates the need to
oversize MOSFETs and inductors to compensate for
thermal effects. Connecting ILIM to V CC programs the
default current-limit threshold. To select a different cur-
rent-limit threshold, connect a resistor-divider from REF
to GND with ILIM connected to the center tap. The volt-
age at ILIM is proportional to the current-limit threshold.
See the Setting the Current-Limit section for more details.
The current-limit circuitry terminates the DH_ on-time
immediately when the current-sense voltage (V CS_+ -
V CS_- ) exceeds the current-limit threshold, allowing the
output inductor current to ramp down. At the next
switching cycle, the PWM pulse is skipped if the output
inductor current is still above the current-limit threshold.
Otherwise, the new cycle initiates as normal.
The MAX8809A/MAX8810A offer foldback-current pro-
tection under soft-start and overload conditions. This
feature allows the VRM to safely operate under short-
circuit conditions and to automatically recover once the
short-circuit condition is removed. If the output voltage
falls below the VRREADY threshold during an overcur-
rent event, the foldback current-limit circuitry sets the
current-limit threshold to half the user-selected value.
Output Differential Sensing (RS+, RS-)
The MAX8809A/MAX8810A feature differential output-
voltage sensing to achieve the highest possible output
accuracy. This allows the controllers to sense the actu-
al voltage at the load, so the controller can compensate
for losses in the power output and ground lines. Traces
from the load point back to RS+ and RS- should be
routed close to each other and as far away as possible
from noise sources (such as inductors and high di/dt
traces). Use a ground plane to shield the remote-sense
traces from noise sources. To filter out common-mode
noise, RC filtering is recommended for these inputs as
shown in Figure 5. For VRD applications, a 100 Ω resis-
tor with a 1nF capacitor should be used. For VRM
applications, additional 50 Ω resistors should be con-
nected from these inputs to the local outputs of the
converter before the VRM connector. This avoids
excessive voltage at the CPU in case the remote-sense
connections get disconnected.
Programming the Output-Voltage Droop
Both the MAX8809A and MAX8810A employ peak-cur-
rent-mode control with finite gain to actively set the out-
put-voltage droop. Figure 6 shows the simplified control
block diagram. The relationship between the output
inductor current in an N-phase DC-DC converter and
the output voltage of the voltage-error amplifier is:
I OUT
N
where G CA (30V/V typ) is the gain of the differential cur-
rent amplifier and N is the number of phases. I OUT is the
total output current. Therefore, when the output current
increases, V C increases. On the other hand, V C is relat-
ed to the output voltage of the converter by the following
equation:
V C = g MV × R COMP × ( V DAC ? V OUT )
where g MV is the transconductance of the voltage-error
amplifier (2mS typ) and V DAC is the VID-generated voltage.
TO POSITIVE OUTPUT
OF VRM
I L_PEAK
R SENSE
R1
50 Ω
R3
100 Ω
RS+
G CA
TO REMOTE SENSE
LOCATION
R2
R4
100 Ω
C1
1nF
C2
1nF
RS-
MAX8809A/
MAX8810A
V OUT
V i
g MV
V C
PWM
COMPARATOR
50 Ω
TO POWER GROUND
OF VRM
V DAC
VOLTAGE-
ERROR AMPLIFIER
R COMP
Figure 5. Recommended Filtering for Output-Voltage Remote
Sensing
Figure 6. Simplified Peak Current-Mode Control IC with Active
Output-Voltage Positioning
20
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| MAX8810AETM+ | 功能描述:电流型 PWM 控制器 VRD11/10 K8 Rev. F 2/3/4-Phase PWM Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8810AETM+T | 功能描述:电流型 PWM 控制器 VRD11/10 K8 Rev. F 2/3/4-Phase PWM Ctlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8811EEE+ | 功能描述:功率驱动器IC High-Speed Dual Phase Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX8811EEE+T | 功能描述:功率驱动器IC High-Speed Dual Phase Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX8814ETA+ | 制造商:Maxim Integrated Products 功能描述:CHGR LI-ION/LI-POL 570MA 4.2V 8TDFN EP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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