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| 型号： | MAX17528GTJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/41页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM VID PS 1PH 32-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Quick-PWM™ |
| 应用： | 控制器，Intel IMVP-6.5? GMCH |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.01 V ~ 1.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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1-Phase Quick-PWM
Intel IMVP-6.5/GMCH Controllers
Pin Description
PIN
1
2
3
4
5
6
NAME
IMON
GNDS
FB
CSN
CSP
SLOW
FUNCTION
Current Monitor Output. The MAX17528 IMON output sources a current that is directly proportional
to the current-sense voltage as defined by:
I IMON = G m(IMON) x (V CSP - V CSN )
where G m(IMON) = 5mS (typ).
The IMON current is unidirectional (sources current out of IMON only) for positive current-sense
values. For negative current-sense voltages, the IMON current is zero.
Connect an external resistor between IMON and VSS_SENSE to create the desired IMON gain
based on the following equation:
R IMON = 0.999V/(IMAX x R SENSE x G m(IMON) )
where IMAX is defined in the Current Monitor (IMON) section of the Intel IMVP-6.5 specification and
based on discrete increments (20A, 30A, 40A, etc.,), R SENSE is the typical effective value of the
current-sense element (sense resistor or inductor DCR) that is used to provide the current-sense
voltage, and G m(IMON) is the typical transconductance amplifier gain as defined in the Electrical
Characteristics table.
The IMON voltage is internally clamped to a maximum of 1.1V (typ).
The transconductance amplifier and voltage clamp are internally compensated, so IMON cannot
directly drive large capacitance values. To filter the IMON signal, use an RC filter as shown in
Figure 1. IMON is pulled to ground when the MAX17528 is in shutdown.
Remote Ground-Sense Input. Connect directly to the CPU or GMCH V SS sense pin (ground sense)
or directly to the ground connection of the load. GNDS internally connects to a transconductance
amplifier that adjusts the feedback voltage, compensating for voltage drops between the
regulator ’s ground and the processor ’s ground.
Output of the Voltage-Positioning Transconductance Amplifier. Connect a resistor, R FB , between
FB and the positive side of the feedback remote sense to set the steady-state droop based on the
voltage-positioning gain requirement.
R FB = R DROOP /(R SENSE x GMD)
where R DROOP is the desired voltage-positioning slope, GMD = 600μS typ and R SENSE is the
value of the current-sense resistor that is used to provide the (CSP, CSN), current-sense voltage. If
lossless sensing is used, R SENSE = R L . In this case, consider using a thermistor-resistor network
to minimize the temperature dependence of the voltage-positioning slope. Droop can be disabled
by shorting FB to the positive remote-sense point, but doing so increases the minimum ESR
requirement of the output capacitance for stability, and FB might therefore need to be driven by a
carefully designed feed-forward network. FB is high impedance in shutdown.
Negative Inductor Current-Sense Input. Connect CSN to the negative terminal of the inductor
current-sensing resistor or directly to the negative terminal of the inductor if the lossless DCR
sensing method is used (see Figure 4).
Under V CC UVLO conditions and after soft-shutdown is completed, CSN is internally pulled to GND
through a 10
FET to discharge the output.
Positive Inductor Current-Sense Input. Connect CSP to the positive terminal of the inductor current-
sensing resistor or directly to the positive terminal of the filtering capacitor used when the
lossless DCR sensing method is used (see Figure 4).
Active-Low Slew-Rate Select Input. This 1.0V logic input signal selects between the nominal and
slow (half of nominal rate) slew rates. When SLOW is forced high, the selected nominal slew rate is
set by the time resistance. When SLOW is forced low, the slew rate is reduced to half of the
nominal slew rate.
For IMVP-6.5 applications ( CLKEN pullup to 3.3V with 1.9k ), the fast slew rate is not needed.
Connect SLOW to GND.
For GMCH 2009 applications ( CLKEN = GND), connect to the system GFXDPRSLPVR signal.
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