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参数资料
| 型号： | MAX17582GTM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/42页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM 2PH IMVP-6.5 48-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? |
| 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： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
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Dual-Phase, Quick-PWM Controller for
IMVP-6.5 CPU Core Power Supplies
Differential Remote Sense
The MAX17582 includes differential, remote-sense
inputs to eliminate the effects of voltage drops along the
PCB traces and through the processor’s power pins. The
feedback-sense node connects to the voltage-position-
ing resistor (R FB ). The ground-sense (GNDS) input con-
nects to an amplifier that adds an offset directly to the
target voltage, effectively adjusting the output voltage to
counteract the voltage drop in the ground path. Connect
the voltage-positioning resistor (R FB ) and ground-sense
(GNDS) input directly to the processor’s remote-sense
outputs, as shown in Figure 1.
Integrator Amplifier
An integrator amplifier forces the DC average of the FB
voltage to equal the target voltage. This transconduc-
tance amplifier integrates the feedback voltage and pro-
vides a fine adjustment to the regulation voltage (Figure
2), allowing accurate DC output-voltage regulation
regardless of the output ripple voltage. The integrator
amplifier can shift the output voltage by ±100mV (typ).
The differential input-voltage range is at least ±60mV
total, including DC offset and AC ripple.
The MAX17582 disables the integrator by connecting
the amplifier inputs together at the beginning of all VID
transitions done in pulse-skipping mode (DPRSLPVR =
high). The integrator remains disabled until 20μs after
the transition is completed (the internal target settles)
and the output is in regulation (edge detected on the
error comparator).
Transient-Overlap Operation
When a transient occurs, the response time of the con-
troller depends on how quickly it can slew the inductor
current. Multiphase controllers that remain 180° out-of-
phase when a transient occurs actually respond slower
than an equivalent single-phase controller. To provide
fast-transient response, the MAX17582 supports a
phase-overlap mode, which allows the dual regulators
to operate in-phase when heavy load transients are
detected, effectively reducing the response time. After
either high-side MOSFET turns off, if the output voltage
does not exceed the regulation voltage when the mini-
mum off-time expires, the controller simultaneously
turns on both high-side MOSFETs during the next on-
time cycle. This maximizes the total inductor current
slew rate. The phases remain overlapped until the out-
put voltage exceeds the regulation voltage after the
minimum off-time expires.
After the phase-overlap mode ends, the controller automat-
ically begins with the opposite phase. For example, if the
secondary phase provided the last on-time pulse before
overlap operation began, the controller starts switching
with the main phase when overlap operation ends. Table 3
is the operating mode truth table.
Nominal Output-Voltage Selection
The nominal no-load output voltage (V TARGET ) is
defined by the selected voltage reference (VID DAC)
plus the remote ground-sense adjustment (V GNDS ) as
defined in the following equation:
V TARGET = V FB = V DAC + V GNDS
where V DAC is the selected VID voltage. On startup, the
MAX17582 slews the target voltage from ground to the
preset boot voltage.
DAC Inputs (D0–D6)
The digital-to-analog converter (DAC) programs the out-
put voltage using the D0–D6 inputs. D0–D6 are low-
voltage (1.0V) logic inputs, designed to interface directly
with the CPU. Do not leave D0 –D6 unconnected.
Changing D0–D6 initiates a transition to a new output-
voltage level. Change D0–D6 together, avoiding greater
than 20ns skew between bits. Otherwise, incorrect DAC
readings might cause a partial transition to the wrong volt-
age level followed by the intended transition to the correct
voltage level, lengthening the overall transition time. The
available DAC codes and resulting output voltages are
compatible with the IMVP-6.5 (Table 4) specifications.
24
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