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参数资料
| 型号： | MAX1830EEE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3A 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 1.5V，1.8V，2.5V，可调 |
| 输入电压： | 3 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-QSOP |
| 产品目录页面： | 1410 (CN2011-ZH PDF) |
3A, 1MHz, Low-Voltage, Step-Down Regulators with
Synchronous Rectification and Internal Switches
voltage and ground (Figure 4). Regulation is main-
tained for adjustable output voltages when V FB = V REF .
Use 30k ? for R1. R2 is given by the equation:
L =
V OUT × t OFF
I OUT × LIR
R2 = R1 ? OUT ? 1 ?
? V ?
? V REF ?
where V REF is typically 1.1V.
Programming the Switching
Frequency and Off-Time
The MAX1830/MAX1831 feature a programmable PWM
mode-switching frequency, which is set by the input
where:
I OUT = maximum DC load current
LIR = ratio of peak-to-peak AC inductor current to DC
load current, typically 0.25
The peak-inductor current at full load is 1.125 x I OUT if
the above equation is used; otherwise, the peak current
is calculated by:
and output voltage and the value of R TOFF , connected
from TOFF to GND. R TOFF sets the PMOS power switch
off-time in PWM mode. Use the following equation to
I PEAK = I OUT +
V OUT × t OFF
2 × L
select the off-time according to your desired switching
frequency in PWM mode:
Choose an inductor with a saturation current at least as
high as the peak-inductor current. The inductor you
t OFF =
( V IN – V OUT ? V PMOS )
f PWM ( V IN ? V PMOS + V NMOS )
select should exhibit low losses at your chosen operat-
ing frequency.
Capacitor Selection
The input-filter capacitor reduces peak currents and
where:
t OFF = the programmed off-time
V IN = the input voltage
V OUT = the output voltage
noise at the voltage source. Use a low-ESR and low-
ESL capacitor located no further than 5mm from IN.
Select the input capacitor according to the RMS input
ripple-current requirements and voltage rating:
V OUT ( IN ? V OUT
V PMOS = the voltage drop across the internal PMOS
power switch
V NMOS = the voltage drop across the internal NMOS
I RIPPLE = I LOAD
V
V IN
)
synchronous-rectifier switch
f PWM = switching frequency in PWM mode
Select R TOFF according to the formula:
R TOFF = (t OFF - 0.07μs) (110k ? / 1.00μs)
Recommended values for R TOFF range from 36k ? to
430k ? for off-times of 0.4μs to 4μs.
where I RIPPLE = input RMS current ripple.
The output-filter capacitor affects the output-voltage rip-
ple, output load-transient response, and feedback-loop
stability. For stable operation, the MAX1830/MAX1831
require a minimum output ripple voltage of V RIPPLE ≥ 1%
? V OUT .
The minimum ESR of the output capacitor should be:
Inductor Selection
The key inductor parameters must be specified: induc-
tor value (L) and peak current (I PEAK ). The following
ESR > 1 % ×
L
t OFF
C OUT ≥ OFF 79 μ FV / μ s
equation includes a constant, denoted as LIR, which is
the ratio of peak-to-peak inductor AC current (ripple
current) to maximum DC load current. A higher value of
LIR allows smaller inductance but results in higher loss-
es and ripple. A good compromise between size and
losses is found at approximately a 25% ripple-current
to load-current ratio (LIR = 0.25), which corresponds to
a peak-inductor current 1.125 times the DC load cur-
rent:
Stable operation requires the correct output-filter
capacitor. When choosing the output capacitor, ensure
that:
t
V OUT
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1830EEE+ | 功能描述:直流/直流开关调节器 3A 1MHz Step-Down 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 |
| MAX1830EEE+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) 制造商:Maxim Integrated Products 功能描述:IC STEP-DOWN PWM DC/DC CONVERTER QSOP-16 |
| MAX1830EEE+T | 功能描述:直流/直流开关调节器 3A 1MHz Step-Down 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 |
| MAX1830EEE-T | 功能描述:直流/直流开关调节器 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 |
| MAX1830EVKIT | 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 |
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