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| 型号： | MAX17080GTL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 41/48页 |
| 文件大小： | 0K |
| 描述： | IC CONTROLLER AMD SVI 40-TQFN |
| 标准包装： | 60 |
| 应用： | 控制器，AMD SVI |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 3 |
| 输出电压： | 0.013 V ~ 1.55 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： | 管件 |
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AMD 2-/3-Output Mobile Serial
VID Controller
C BST =
= 0 . 24μ F
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
capacitance would be:
: 2 × 24nC
200 mV
Selecting the closest standard value, this example
requires a 0.22μF ceramic capacitor.
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:
NB SMPS Design Procedure
NB Inductor Selection
:
( R ESR + R PCB ) ≤
V STEP
? I LOAD ( MAX )
V IN 3 ? V OUT 3
L 3 = ??
: ? ? OUT 3 ?
? f SW 3 I LOAD 3 ( MAX ) LIR ? ? V IN 3 ?
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.
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:
? ?
V IN 3 f SW 3 3
R ESR ≤ ?
? V RI P PLE3
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
:
L
? ? ( V IN 3 ? V OUT 3 ) V OUT 3 ? ?
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:
where f SW3 is the switching frequency. The actual capac-
itance 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 usual-
V ( V IN 3 ? V OUT 3 )
V IN 3 f SW 3 3
:
? I INDUCTOR = OUT 3
L
ly limited by ESR and voltage rating rather than by
capacitance value (this is true of polymer types).
The capacitance value required is determined primarily
I PEAK 3 = I LOAD 3 ( MAX ) + ? INDUCTOR ?
= ( ? I LOAD 3 ( MAX ) ) 2 L 3
( ? I L OAD 3 ( MAX ) )
? I L OAD 3 ( MAX ) ( t SW 3 ? ? t )
: V SAG 3 = 2 C
(
)
OUT 3 V IN 3 × D MAX ? V OUT 3
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 Peak Inductor Current Limit (ILIM3)
The MAX17080 NB regulator overcurrent protection
employs a peak current-sensing algorithm that uses the
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
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.
The peak current-limit threshold is set by the ILIM3 pin
setting (see the Offset and Current-Limit Setting for NB
SMPS (ILIM3) section).
by the stability requirements. However, the soar and
sag calculations are still provided here for reference.
Low inductor values allow the inductor current to slew
faster, replenishing charge removed from or added to
the output filter capacitors by a sudden load step.
Therefore, the amount of output soar and sag when the
load is applied or removed is a function of the output
voltage and inductor value. The soar and sag voltages
are calculated as:
V SOAR 3
2 V OUT 3 C OUT 3
2
L 3
+
C OUT 3
where D MAX is the maximum duty cycle of the NB
SMPS as listed in the Electrical Characteristics table,
t SW3 is the NB switching period programmed by the
OSC pin, and ? t equals V OUT /V IN x t SW when in forced-
PWM mode, or L x I LX3MIN /(V IN - V OUT ) when in pulse-
skipping mode.
______________________________________________________________________________________
41
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相关代理商/技术参数 |
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|---|---|
| MAX17080GTL+ | 功能描述:开关变换器、稳压器与控制器 Integrated Circuits (ICs) Voltage Regulators - Special Purpose - IC CONTROLLER AMD SVI 40-TQFN RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MAX17080GTL+T | 功能描述:开关变换器、稳压器与控制器 Integrated Circuits (ICs) Voltage Regulators - Special Purpose - IC CONTROLLER AMD SVI 40-TQFN RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MAX17081EVKIT+ | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX17081EWV+ | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17081EWV+T | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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