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| 型号： | MAX8833ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A DL 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： | 2 |
| 输出电压： | 0.6 V ~ 3.24 V |
| 输入电压： | 2.35 V ~ 3.6 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 1MHz ~ 2MHz |
| 电流 - 输出： | 3A |
| 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） |
Dual, 3A, 2MHz Step-Down Regulator
EN
OUT1
OUT2
PWRGD1
PWRGD2
10k Ω
10k Ω
PWRGD1
V DD
PWRGD2
SS1
EN1
EN2
SS2
REFIN
EN
Figure 3d. Startup and Sequencing Options—Matching Startup Slopes of Output Voltages with Internal Reference
In Figure 3d, EN1 and EN2 are connected together and
driven as a single input. Although both outputs begin
ramping up at the same time, slope matching is
achieved by selecting the SS_ capacitors. See the
Setting the Soft-Start Time section for information on
selecting the SS_ capacitors. In Figure 3d, the slope of
the output voltages during soft-start is equal. This is
achieved by setting the ratio of the soft-start capacitors
equal to the ratio of the output voltages:
Design Procedure
Setting the Output Voltage
The output voltages for regulator 1 (with REFIN con-
nected to SS1) and regulator 2 are set with a resistor
voltage-divider connected from the output to FB_ to
GND as shown in Figure 4. Select a value for the resis-
tor connected from output to FB_ (R4 in Figure 4)
between 2k Ω and 10k Ω . Use the following equations to
find the value for the resistor connected from FB_ to
= OUT 1
R 6 =
C SS 1 V
C SS 2 V OUT 2
Synchronization (FSYNC)
The MAX8833 operates from 500kHz to 2MHz using
either its internal oscillator, or an externally supplied
clock. See the Setting the Switching Frequency section.
GND (R6 in Figure 4):
0 . 6
( V OUT _ ? 0 . 6 )
L
LX_
× R 4
OUTPUT
Thermal-Overload Protection
Thermal-overload protection limits the total power dissi-
pation of the MAX8833. Internal thermal sensors monitor
MAX8833
C O
R4
R8
the junction temperature at each of the regulators. When
the junction temperature exceeds +165°C, the corre-
FB_
C11
sponding regulator is shut down, allowing the IC to cool.
The thermal sensor turns the regulator on after the junc-
tion temperature cools by +20°C. In a continuous ther-
mal-overload condition, this results in a pulsed output.
COMP_
R7
C9
C10
R6
Figure 4. Type III Compensation Network
12
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| MAX8833ETJ+ | 功能描述:直流/直流开关调节器 Dual 3A 2MHz Step-Down Regulator 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 |
| MAX8833ETJ+T | 功能描述:直流/直流开关调节器 Dual 3A 2MHz Step-Down Regulator 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 |
| MAX8834YEVKIT+ | 功能描述:LED 照明开发工具 Adaptive Step-Up Converters with 1.5A Flash Driver RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX8834YEWP+T | 功能描述:LED照明驱动器 Adaptive Step-Up Converter RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8834ZEWP+T | 功能描述:LED照明驱动器 Adaptive Step-Up Converter RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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