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| 型号： | MAX17480GTL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 42/48页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR SERIAL VID 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 处理器 |
| 电流 - 电源： | 5mA |
| 电源电压： | 4.5 V ~ 5.5 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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AMD 2-/3-Output Mobile Serial
VID Controller
select the boost capacitors to avoid discharging the
capacitor more than 200mV while charging the high-
side MOSFETs’ gates:
NB Peak Inductor Current Limit (ILIM3)
The MAX17480 NB regulator overcurrent protection
employs a peak current-sensing algorithm that uses the
C BST =
N × Q GATE
200 mV
high-side MOSFET R ON(NH3) as the current-sense ele-
ment. Since the controller limits the peak inductor cur-
rent, the maximum average load current is less than the
where N is the number of high-side MOSFETs used for
one SMPS, and Q GATE is the gate charge specified in the
MOSFET ’s data sheet. For example, assume two
IRF7811W n-channel MOSFETs are used on the high
side. According to the manufacturer’s data sheet, a single
IRF7811W has a maximum gate charge of 24nC (V GS =
5V). Using the above equation, the required boost
peak current-limit threshold by an amount equal to half
the inductor ripple current. Therefore, the maximum
load capability is a function of the current-limit setting,
inductor value, switching frequency, and input-to-out-
put voltage difference. When combined with the output
undervoltage-protection circuit, the system is effectively
protected against excessive overload conditions.
C BST =
capacitance would be:
:
2 × 24nC
200 mV
= 0 . 24μ F
The peak current-limit threshold is set by the ILIM3 pin
setting (see the Offset and Current-Limit Setting for NB
SMPS (ILIM3) section).
V IN 3 ? V OUT 3
L 3 = ??
: ? ? OUT 3 ?
? f SW 3 I LOAD 3 ( MAX ) LIR ? ? V IN 3 ?
( R ESR PCB ) ≤
+ R
? I LOAD ( MAX )
V ( V IN 3 ? V OUT 3 )
? I INDUCTOR = OUT 3
V IN 3 f SW 3 3
? ?
V IN 3 f SW 3 3
R ESR ≤ ?
? V RI P PLE3
? ? ( V IN 3 ? V OUT 3 ) V OUT 3 ? ?
I PEAK 3 = I LOAD 3 ( MAX ) + ? INDUCTOR ?
Selecting the closest standard value, this example
requires a 0.22μF ceramic capacitor.
NB SMPS Design Procedure
NB Inductor Selection
The switching frequency and operating point (% ripple
current or LIR) determine the inductor value as follows:
? ? ? V ?
?
where I LOAD3(MAX) is the maximum current and f SW3 is
the switching frequency of the NB regulator.
Find a low-loss inductor having the lowest possible DC
resistance that fits in the allotted dimensions. If using
a swinging inductor (where the inductance decreases
linearly with increasing current), evaluate the LIR with
properly scaled inductance values. For the selected
inductance value, the actual peak-to-peak inductor rip-
ple current ( ? I INDUCTOR ) is defined by:
:
L
Ferrite cores are often the best choice, although pow-
dered iron is inexpensive and can work well at 200kHz.
The core must be large enough not to saturate at the
peak inductor current (I PEAK3 ):
? ? I ?
? 2 ?
NB Output Capacitor Selection
The output filter capacitor must have low enough ESR to
meet output ripple and load-transient 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
:
The output capacitor ’s size 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 capacitor’s ESR. For
single-phase operation, the maximum ESR to meet the
output-ripple-voltage requirement is:
L
:
where f SW3 is the switching frequency. 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, capacitor selection
is usually limited by ESR and voltage rating rather than
by capacitance value (this is true of polymer types).
42
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