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参数资料
| 型号： | MAX8632ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/29页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY DDR 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 控制器，DDR |
| 输入电压： | 2 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 1.8V，2.5V，0.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Integrated DDR Power-Supply Solution for
Desktops, Notebooks, and Graphic Cards
temperature rise at the RMS input current for optimal
LX
L
V OUT
reliability and lifetime.
Output Capacitor Selection (Buck)
MAX8632
DL
Q2
C OUT
The output filter capacitor must have low enough equiv-
alent series resistance (R ESR ) to meet output ripple and
load-transient requirements, yet have high enough ESR
PGND1
GND
OUT
R C
to satisfy stability requirements.
For processor core voltage converters and other appli-
cations in which the output is subject to violent load
transients, the output capacitor’s size depends on how
much R ESR is needed to prevent the output from dip-
ping too low under a load transient. Ignoring the sag
due to finite capacitance:
FB
R D
R ESR ≤
V STEP
? I LOAD ( MAX )
In applications without large and fast load transients,
the output capacitor’s size often depends on how much
I PEAK LOAD ( MAX ) ? 1 +
= I
?
R ESR ≤
Figure 6. Setting VOUT with a Resistive Voltage-Divider
to 200kHz. The core must be large enough not to satu-
rate at the peak inductor current (I PEAK ):
? LIR ?
? 2 ?
Most inductor manufacturers provide inductors in stan-
dard values, such as 1.0μH, 1.5μH, 2.2μH, 3.3μH, etc.
Also look for nonstandard values, which can provide a
better compromise in LIR across the input voltage range.
If using a swinging inductor (where the no-load induc-
tance decreases linearly with increasing current), evalu-
ate the LIR with properly scaled inductance values.
Input Capacitor Selection (Buck)
The input capacitor must meet the ripple current
requirement (I RMS ) imposed by the switching currents:
R ESR is needed to maintain an acceptable level of out-
put voltage ripple. The output ripple voltage of a step-
down controller is approximately equal to the total
inductor ripple current multiplied by the output capaci-
tor’s R ESR . Therefore, the maximum R ESR required to
meet ripple specifications is:
V RIPPLE
I LOAD ( MAX ) × LIR
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 usually selected by ESR and voltage rating
rather than by capacitance value (this is true of tanta-
lums, OSCONs, polymers, and other electrolytics).
When using low-capacity filter capacitors, such as
ceramic capacitors, size is usually determined by the
V OUT ( V IN OUT )
I RMS = I LOAD
V IN
- V
capacity needed to prevent V SAG and V SOAR from
causing problems during load transients. Generally,
once enough capacitance is added to meet the over-
shoot requirement, undershoot at the rising load edge
I RMS has a maximum value of I LOAD / 2 when V IN = 2 ×
V OUT . For most applications, nontantalum capacitors
(ceramic, aluminum, POS, or OSCON) are preferred
due to their resistance to power-up surge currents typi-
cal of systems with a mechanical switch or connector in
series with the input. If the MAX8632 is operated as the
second stage of a two-stage power conversion system,
tantalum input capacitors are acceptable. In either con-
figuration, choose a capacitor that has less than 10°C
is no longer a problem (see the V SAG and V SOAR equa-
tions in the Transient Response (Buck) section).
However, low-capacity filter capacitors typically have
high-ESR zeros that can affect the overall stability (see
the Stability Requirements section).
______________________________________________________________________________________
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8632EVKIT | 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 |
| MAX8633ELA+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX8633ELA+T | 功能描述:低压差稳压器 - LDO Dual 300mA Pin-Prog LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX8633ETA+ | 制造商:Maxim Integrated Products 功能描述:LDO REG 1.5V TO 3V 0.3A 8TDFN EP - Rail/Tube |
| MAX8633ETA+T | 功能描述:低压差稳压器 - LDO Dual 300mA Pin-Prog LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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