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| 型号： | MAX17021GTL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 42/48页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM DUAL IMVP-6+ 40-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+，IMVP-6.5? |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Dual-Phase, Quick-PWM Controllers for
IMVP-6+/IMVP-6.5 CPU Core Power Supplies
? ? ? V OUT ?
L = η TOTAL ?
? ?
? f SW LOAD ( MAX ) LIR ? ? V I N ?
?
I LIMIT ( LOW ) > ?
I PEAK = ?
? ? ? 1 + 2 ? ?
( R ESR + R PCB ) ≤ Δ I
Inductor Selection
The switching frequency and operating point (% ripple
current or LIR) determine the inductor value as follows:
V IN - V OUT
I
where η TOTAL is the total number of phases.
Find a low-loss inductor having the lowest possible DC
resistance that fits in the allotted dimensions. Ferrite
cores are often the best choice, although powdered
iron is inexpensive and can work well at 200kHz. The
core must be large enough not to saturate at the peak
inductor current (I PEAK ):
? I LOAD ( MAX ) ? ? LIR ?
? η TOTAL ?
Transient Response
The inductor ripple current impacts transient-response
performance, especially at low V IN - V OUT differentials.
Low inductor values allow the inductor current to slew
faster, replenishing charge removed from the output fil-
ter capacitors by a sudden load step. The amount of
output sag is also a function of the maximum duty fac-
tor, which can be calculated from the on-time and mini-
mum off-time. For a dual-phase controller, the
worst-case output sag voltage can be determined by:
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 effec-
tive series resistance (ESR) to meet output ripple and
load-transient requirements, yet have high enough ESR
to satisfy stability requirements.
In CPU V CORE converters and other applications 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:
V STEP
LOAD ( MAX )
In non-CPU applications, the output capacitor’s size
(
) 2
? ? + t OFF (M IN ) ?
? ? 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 ) ?
? ? + t OFF ( MIN ) ?
? ? ?
? ?
V SAG =
? V IN
V
? ?
? ? V IN ? ?
Δ I LOAD(MAX) ? ? V OUT T SW ? ?
?
2 C OUT V IN ?
often depends on how much ESR is needed to maintain
an acceptable level of output ripple voltage. The output
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-
phase operation, the maximum ESR to meet ripple
( Δ I LOAD ( MAX ) ) 2 L
2 η TOTAL OUT OUT
V SOAR ≈
? ? ( V IN - η TOTAL V OUT ) V OUT ? ?
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.
requirements is:
? V IN f SW L ?
R ESR ≤ ? ? V RI P PLE
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).
42
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