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| 型号： | MAX5066EUI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 4.75 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
Configurable, Single-/Dual-Output, Synchronous
Buck Controller for High-Current Applications
Table 2. Low-Side MOSFET Losses
LOSS
DESCRIPTION
SEGMENT LOSSES
P CONDUCTION = I RMS 2 × R DS ( ON )
Conduction Loss
Losses associated with MOSFET on-time, I RMS
is a function of load current and duty cycle.
where I RMS ≈
V IN ? V OUT
V IN
× I LOAD
Losses associated with charging and
Gate Drive Loss
discharging the gate of the MOSFET every
cycle. There is no Q GD charging involved in this
P GATEDRIVE = V DD × ( Q G ? Q GD ) × f SW
MOSFET due to the zero-voltage turn-on. The
charge involved is (Q G - Q GD ).
Note: The gate drive losses are distributed between the drivers and the MOSFETs in the ratio of the gate driver’s resistance and the
MOSFET’s internal gate resistance.
load step. Use a combination of SP polymer and
ceramic capacitors for better transient load and rip-
ple/noise performance.
Keep the maximum output-voltage deviation less than
Due to tolerances involved, the minimum average volt-
age at which the voltage across the current-sense
resistor is clamped is 20.4mV. Therefore, the minimum
average current limit is set at:
or equal to the adaptive voltage-positioning window
( ? V OUT ). During a load step, assume a 50% contribu-
tion each from the output capacitance discharge and
the voltage drop across the ESR ( ? V OUT = ? V ESR_OUT
I LIMIT ( MIN ) =
20 . 4 × 10 ? 3
R SENSE
R SENSE = = 2 . 04 m ?
+ ? V Q_OUT ). Use the following equations to calculate
the required ESR and capacitance value:
? V ESR _ OUT
R ESR _ OUT =
I LOAD _ STEP
I LOAD _ STEP × t RESPONSE
C OUT =
? V Q _ OUT
where I LOAD_STEP is the step in load current and
t RESPONSE is the response time of the controller.
Controller response time depends on the control-loop
bandwidth. C OUT is C6 and C7 in Figure 6.
Current Limit
The average current-mode control technique of the
MAX5066 accurately limits the maximum average out-
For example, the current-sense resistor:
20.4 mV
10 A
for a maximum output current of 10A. The standard
value is 2m ? . Also, adjust the value of the current-
sense resistor to compensate for parasitics associated
with the PC board. Select a noninductive resistor with
appropriate wattage rating.
The second type of current limit is the peak current limit
as explained in the Peak-Current Comparator section.
The third current-protection circuit is the hiccup fault
protection as explained in the Hiccup Fault Protection
section. The average current during a short at the out-
put is given by:
put current per phase. The MAX5066 senses the volt-
age across the sense resistor and limits the maximum
inductor current accordingly. Use the equations below
to calculate the current-sense resistor values:
I AVG ( SHORT ) =
1 . 41 × 10 ? 3
R SENSE
Reverse Current Limit
I LOAD ( MAX ) =
24 . 75 × 10 ? 3
R SENSE
The MAX5066 limits the reverse current when the output
capacitor voltage is higher than the preset output volt-
age. Calculate the maximum reverse current limit based
on V CLAMP_LO and the current-sense resistor R SENSE .
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5066EUI+ | 功能描述:DC/DC 开关控制器 Synch Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX5066EUI+T | 功能描述:DC/DC 开关控制器 Synch Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX5066EUI-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX5066EVKIT | 功能描述:电源管理IC开发工具 MAX5066 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 |
| MAX5067 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual-Phase, +0.6V to +3.3V Output Parallelable, Average-Current-Mode Controllers |
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