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| 型号： | MAX17528GTJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 30/41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
Forced-PWM Operation (Normal Mode)
During soft-shutdown and normal operation—when the
CPU is actively running (SKIP = low, Table 3), the
MAX17528 operates with the low-noise, forced-PWM
control scheme. Forced-PWM operation disables the
zero-crossing comparator, forcing the low-side gate-
drive waveforms to constantly be the complement of
the high-side gate-drive waveforms. This keeps the
switching frequency constant and allows the inductor
current to reverse under light loads, providing fast,
accurate negative output-voltage transitions by quickly
discharging the output capacitors.
Forced-PWM operation comes at a cost: the no-load
+5V bias supply current remains between 10mA to
50mA, depending on the external MOSFETs and switch-
ing frequency. To maintain high efficiency under light-
load conditions, the processor can switch the controller
to a low-power pulse-skipping control scheme after
entering suspend mode. The MAX17528 automatically
Light-Load Pulse-Skipping Operation
During soft-start and sleep states —SKIP is pulled
high—the MAX17528 operates in pulse-skipping mode.
The pulse-skipping mode enables the driver’s zero-
crossing comparator, so the controller pulls DL low
when the low-side MOSFET voltage drop (LX to GND
voltage) detects “zero” inductor current. This keeps the
inductor from sinking current and discharging the output
capacitors and forces the controller to skip pulses under
light-load conditions to avoid overcharging the output.
Upon entering pulse-skipping operation, the controller
temporarily blanks the upper PWRGD and CLKEN
thresholds, when the transition to pulse-skipping opera-
tion coincides with a VID code change. Once the error
amplifier detects that the output voltage is in regulation,
the upper PWRGD and upper CLKEN , resume tracking
the selected VID DAC code. The MAX17528 automati-
cally uses forced-PWM operation during soft-shutdown,
regardless of the SKIP configuration.
uses pulse-skipping operation during soft-start, regard-
less of the SKIP configuration.
10mV/ μ s
ACTIVE VID
CPU CORE
VOLTAGE
VID (D0–D6)
GFXDPRSLPVR
DEEPER SLEEP VID
ACTIVE VID
DPRSLP VID
PULSE SKIPPING
1-PHASE FORCED PWM
PWRGD
DH
BLANK HIGH IMPEDANCE
t BLANK
20 μ s typ
BLANK HIGH IMPEDANCE
t BLANK
20 μ s typ
NOTE: GFXDPRSLPVR = SKIP = SLOW.
Figure 7. Fast Render GMCH Sleep Transition
30
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