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| 型号： | MAX8566ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 10A 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 3.1 V |
| 输入电压： | 2.3 V ~ 3.6 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 250kHz ~ 4.2MHz |
| 电流 - 输出： | 10A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
square wave at the desired synchronization frequency.
A rising edge on SYNC triggers the internal SYNC cir-
Inductor Design
Choose an inductor with the following equation:
cuitry. The frequency of the input into SYNC must be
higher than the internal oscillator frequency set by
R FREQ . Leave SYNC disconnected to disable the func-
tion and operate on the internal oscillator.
L =
V OUT × ( V IN ? V OUT )
f s × V IN × LIR × I OUT ( MA X )
The MAX8566 has a SYNCOUT output that generates a
clock signal that is 180° out-of-phase with its internal
oscillator, or the signal applied to SYNC. This allows for
another regulator to be synchronized 180° out-of-phase
to reduce the input ripple current.
Power-Good Output (PWRGD)
PWRGD is an open-drain output that goes high imped-
ance once the soft-start ramp has concluded, provided
V FB is above 0.54V. PWRGD pulls low when V FB is
below 0.54V for at least 50μs. PWRGD is low during
where LIR is the ratio of the inductor ripple current to
average continuous current at the minimum duty cycle.
Choose the LIR between 20% to 40% for best perfor-
mance and stability.
Use a low-loss inductor with the lowest possible DC
resistance that fits in the allotted dimensions. Powered
iron ferrite core types are often the best choice for per-
formance. With any core material the core must be
large enough not to saturate at the peak inductor cur-
rent (I PEAK ). Calculate I PEAK as follows:
I PEAK = ? 1 +
shutdown.
Low-Side MOSFET Driver Supply (LSS)
The MAX8566 provides an external input for the low-
?
?
LIR ?
2 ? ?
× I OUT ( MAX )
V RIPPLE ( C ) =
V RIPPLE ( ESL ) = × ESL
or V RIPPLE ( ESL ) = P ? P × ESL , whichever is greater .
side MOSFET driver supply (LSS). This allows for high-
er gate-drive voltages to maximize converter efficiency
at low input voltages.
Shutdown Mode
Drive EN to GND to shut down the IC and reduce qui-
escent current to 4μA. During shutdown, the output is
high impedance. Drive EN high to enable the
MAX8566.
Thermal Protection
Thermal-overload protection limits total power dissipa-
tion in the device. When the junction temperature
exceeds T J = +165°C a thermal sensor forces the
device into shutdown, allowing the die to cool. The ther-
mal sensor turns the device on again after the junction
temperature cools by 20°C, causing a pulsed output
during continuous overload conditions. The soft-start
sequence begins after a thermal-shutdown condition.
Applications Information
V DD Decoupling
To decrease the noise effects due to the high switching
frequency and maximize the output accuracy of the
MAX8566, decouple V DD with a 4.7μF capacitor from
V DD to GND and a 2 ? resistor from V DD to V IN . Place
the capacitor as close to V DD as possible.
Output Capacitor Selection
The key selection parameters for the output capacitor
are capacitance, ESR, ESL, and voltage rating require-
ments. These affect the overall stability, output ripple
voltage, and transient response of the DC-DC convert-
er. The output ripple occurs due to variations in the
charge stored in the output capacitor, the voltage drop
due to the capacitor’s ESR, and the voltage drop due to
the capacitor’s ESL. Calculate the output voltage ripple
due to the output capacitance, ESR, and ESL as:
V RIPPLE = V RIPPLE(C) + V RIPPLE(ESR) + V RIPPLE(ESL)
where the output ripple due to output capacitance,
ESR, and ESL are:
I P ? P
8 × C OUT × f s
V RIPPLE ( ESR ) = I P ? P × E S R
I P ? P
t ON
I
t OFF
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8566ETJ+ | 功能描述:电压模式 PWM 控制器 10A Step-Down Regulator RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX8566ETJ+T | 功能描述:电压模式 PWM 控制器 10A Step-Down Regulator RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX8566ETJ-T | 功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX8566EVKIT | 制造商:Maxim Integrated Products 功能描述:10A OUTPUT STEPDOWN REGULATOR WITH - Rail/Tube |
| MAX8566EVKIT+ | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT FOR THE MAX8566 - Boxed Product (Development Kits) |
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