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| 型号： | MAX15034BAUI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 28TSSOP-EP |
| 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： | 1 或 2 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 4.75 V ~ 5.5 V，5 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 ~ 125°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
where I RMS ≈
× I LOAD
LOSS
Conduction Loss
Gate Drive Loss
DESCRIPTION
Losses associated with MOSFET on-time, I RMS
is a function of load current and duty cycle.
Losses associated with charging and
discharging the gate of the MOSFET every
cycle. There is no Q GD charging involved in this
MOSFET due to the zero-voltage turn-on. The
SEGMENT LOSSES
P CONDUCTION = I RMS 2 × R DS ( ON )
V IN ? V OUT
V IN
P GATEDRIVE = V DD × ( Q G ? Q GD ) × f SW
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.
Keep the maximum output-voltage deviation less than
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
+ ? V Q_OUT ). Use the following equations to calculate
the required ESR and capacitance value:
The minimum average voltage, at which the voltage
across the current-sense resistor is clamped, is either
internally set to 20.4mV or is controlled by the voltage
at AVGLIMIT. The AVGLIMIT ground threshold of
550mV (typ) is the threshold above which the control of
the average current-limit voltage is transferred from the
internal 20.4mV (min) reference to the externally set
R ESR _ OUT =
? V ESR _ OUT
I LOAD _ STEP
V AVGLIMIT . For using the internal average current-limit
value, short AVGLIMIT to AGND. The minimum (inter-
nally set) average current limit is set at:
C OUT =
I LOAD _ STEP × t RESPONSE
? V Q _ OUT
I LIMIT ( MIN ) =
20.4mV
R SENSE
where I LOAD_STEP is the step in load current and
t RESPONSE is the response time of the controller.
For example, the current-sense resistor:
Controller response time depends on the control-loop
bandwidth. C OUT is C6 and C7 in Figure 6.
Current Limit
R SENSE =
20.4mV
10 A
= 2 . 04 m ?
The MAX15034 incorporates two forward current-limit
protection mechanisms, average current limit and hic-
cup fault current limit, which accurately limit the output
current per phase. The average current-mode control
technique of the MAX15034 accurately limits the maxi-
mum average output current per phase. The
MAX15034 senses the voltage across either a sense
resistor or can implement lossless inductor sense,
sensing the voltage across the parasitic resistance of
the inductor (DCR). Use either mechanism to limit the
maximum inductor current.
for a maximum output current limit of 10A. A standard
value is 2m ? . Also, adjust the value of the current-
sense resistor to compensate for parasitics associated
with the PCB. Select a noninductive resistor with an
appropriate wattage rating.
The implementation is shown in Figure 8.
When sensing directly across the inductor, connect an
RC circuit directly across the shunt or inductor (see
Figure 9).
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15034BAUI+ | 功能描述:DC/DC 开关控制器 Configurable Synchronous Buck 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 |
| MAX15034BAUI+T | 功能描述:DC/DC 开关控制器 Configurable Synchronous Buck 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 |
| MAX15034BEVKIT+ | 功能描述:电源管理IC开发工具 MAX15034B 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 |
| MAX15035ETL+ | 功能描述:电压模式 PWM 控制器 15A Step-Down Reg w/Internal Switch 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 |
| MAX15035ETL+T | 功能描述:电压模式 PWM 控制器 15A Step-Down Reg w/Internal Switch 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 |
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