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参数资料
| 型号： | MAX17582GTM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 37/42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
(
)
? ? + t OFF (M IN ) ?
2 ? ? V OUT T SW ? ?
L Δ I LOAD(MAX) ? ? M
?
? +
? ? ( V IN - 2 V OUT ) T SW ? ?
2 C OUT OUT ? ? ? - 2 t OFF ( MIN ) ?
V SAG =
V
? ?
? ? V IN ? ?
? V IN
ripple voltage of a step-down controller equals the total
inductor ripple current multiplied by the output capaci-
tor’s ESR. When operating multiphase systems out-of-
phase, the peak inductor currents of each phase are
staggered, resulting in lower output ripple voltage by
reducing the total inductor ripple current. For multi-
? ? + t OFF ( MIN ) ?
? ? ?
? ?
? ? ( V IN TOTAL OUT OUT ? ?
) V
R ESR ≤ ? ? V RI P PLE
( Δ I LOAD ( MAX ) ) 2 L
2 η TOTAL OUT OUT
V SOAR ≈
I LIMIT ( LOW ) > ?
f ESR ≤ SW
Δ I LOAD(MAX) ? ? V OUT T SW ? ?
?
2 C OUT V IN ?
where t OFF(MIN) is the minimum off-time (see the
Electrical Characteristics table). The amount of overshoot
due to stored inductor energy can be calculated as:
C V
where η TOTAL is the total number of active phases.
Setting the Current Limit
The minimum current-limit threshold must be high
enough to support the maximum load current when the
current limit is at the minimum tolerance value. The val-
ley of the inductor current occurs at I LOAD(MAX) minus
half the ripple current, therefore:
? I LOAD(MAX ) ? ? LIR ?
? ? ?
? η TOTAL ? ? 1 - 2 ?
where η TOTAL is the total number of active phases, and
I LIMIT(LOW) equals the minimum current-limit threshold
voltage divided by the current-sense resistor (R SENSE ).
Output Capacitor Selection
The output filter capacitor must have low-enough ESR
to meet output ripple and load-transient requirements,
yet have high enough ESR to satisfy stability require-
ments.
In CPU V CORE converters and other applications where
phase operation, the maximum ESR to meet ripple
requirements is:
? V IN f SW L ?
- η V
where η TOTAL is the total number of active phases, and
f SW is the switching frequency per phase. The actual
capacitance value required relates to the physical size
needed to achieve low ESR, as well as to the chemistry
of the capacitor technology. Thus, the capacitor is usu-
ally selected by ESR and voltage rating rather than by
capacitance value (this is true of polymer types).
When using low-capacity ceramic filter capacitors,
capacitor size is usually determined by the capacity
needed to prevent V SAG and V SOAR from causing
problems during load transients. Generally, once
enough capacitance is added to meet the overshoot
requirement, undershoot at the rising load edge is no
longer a problem (see the V SAG and V SOAR equations
in the Transient Response section).
Output Capacitor Stability Considerations
For Quick-PWM controllers, stability is determined by
the value of the ESR zero relative to the switching fre-
quency. The boundary of instability is given by the fol-
lowing equation:
f
π
where:
the output is subject to large-load transients, the output
capacitor’s size typically depends on how much ESR is
needed to prevent the output from dipping too low
under a load transient. Ignoring the sag due to finite
capacitance:
and:
f ESR =
1
2 π R EFF C OUT
( R ESR + R PCB ) ≤
V STEP
Δ I LOAD ( MAX )
R EFF = R ESR + R DROOP + R PCB
where C OUT is the total output capacitance, R ESR is the
total equivalent series resistance, R DROOP is the volt-
In non-CPU applications, the output capacitor’s size
often depends on how much ESR is needed to maintain
an acceptable level of output ripple voltage. The output
age-positioning gain, and R PCB is the parasitic board
resistance between the output capacitors and sense
resistors.
______________________________________________________________________________________
37
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