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参数资料
| 型号： | MAX15118EVKIT# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/23页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT STEP-DOWN 18A MAX15118 |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 功率 - 输出： | 27W |
| 输出电压： | 1.5V |
| 电流 - 输出： | 18A |
| 输入电压： | 2.7 V ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX15118 |
MAX15118
High-Efficiency, 18A, Current-Mode Synchronous
Step-Down Regulator with Integrated Switches
C C ≥
C FF =
C SS OUT ×
>> C
3) Select C C . C C is determined by selecting the desired
first system zero, f Z1 , based on the desired phase
margin. Typically, setting f Z1 below 1/5th of f CO pro-
vides sufficient phase margin.
5
2 π f CO × R C
Optionally, for low duty-cycle applications, the addition
of a phase-leading capacitor (C FF in Figure 2 ) helps miti-
gate the phase lag of the damped half-frequency double
pole. Adding a second zero near to but below the desired
crossover frequency increases both the closed-loop
phase margin and the regulator’s unity-gain bandwidth
(crossover frequency). Select the capacitor as follows:
1
2 π × f CO × (R1 || R2)
I SS , the soft-start current, is 10 F A (typ) and V FB is the
0.6V (typ) output feedback voltage threshold. When
using large C OUT capacitance values, the high-side
current limit can trigger during the soft-start period. To
ensure the correct soft-start time, t SS , choose C SS large
enough to satisfy:
V OUT × I SS
(24A - I LOAD ) × V FB
An external tracking reference with steady-state value
between 0V and (V IN - 2.5V) can be applied to SS/REFIN.
In this case, connect an RC network from the external
The recommended value for R SS is approximately 330 I .
R SS is needed to ensure that, during hiccup period,
SS/REFIN can be pulled down internally.
Using C FF , the zero-pole order is adjusted as follows:
f P1 < f P2 < f Z1 < 1/ [ 2 π C FF R 1 ]
? ?
< 1/ ? 2 π C FF ( R1|| R2 ) ? < f P3 < f Z2
V REF_EXT
R SS
C SS
SS/REFIN
MAX15118
C SS = SS SS
Setting the Soft-Start Time
The soft-start feature ramps up the output voltage slowly,
reducing input inrush current during startup. Size the C SS
capacitor to achieve the desired soft-start time, t SS , using:
I × t
V FB
Figure 4. RC Network for External Reference at SS/REFIN
Design Examples
Table 1 provides values for various outputs based on the
typical operating circuit.
Table 1. Suggested Component Values (see the Typical Operating Circuits )
V IN (V)
3.3
3.3
3.3
3.3
3.3
5
5
5
5
5
5
V OUT (V)
0.8
1.2
1.5
1.8
2.5
0.8
1.2
1.5
1.8
2.5
3.3
L (μH)
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.15
0.22
0.22
0.22
LIR (A/A)
0.22
0.28
0.30
0.30
0.22
0.25
0.34
0.39
0.29
0.32
0.28
C15 (nF)
6.8
4.7
3.3
3.3
3.3
6.8
4.7
3.3
3.3
3.3
2.2
R3 (k I )
2.94
2.21
3.83
4.22
5.62
2.94
2.21
3.83
3.92
5.1
4.64
C14 (pF)
22
22
22
22
22
22
22
22
22
22
22
R1 (k I )
1.78
5.36
8.06
10.7
16.9
1.78
5.36
8.06
10.7
16.9
24.3
R2 (k I )
5.36
5.36
5.36
5.36
5.36
5.36
5.36
5.36
5.36
5.36
5.36
Note: C IN , C OUT , and other components are the same as in the standard MAX15118 Evaluation Kit.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15118EVKIT# | 功能描述:电源管理IC开发工具 MAX15118 Eval Kit 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 |
| MAX15118EVKIT+ | 功能描述:电流型 PWM 控制器 18A Buck Converter w/ Integrated Switches RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX15118EWI+ | 功能描述:电流型 PWM 控制器 18A w/Internal Switch RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX15118EWI+T | 功能描述:电流型 PWM 控制器 18A w/Internal Switch RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX15119GTM+ | 功能描述:直流/直流开关调节器 Rev 5 of the MAX17411 for Apple RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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