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参数资料
| 型号： | MAX8855ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 5A 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： | 5A |
| 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, 5A, 2MHz Step-Down Regulators
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
Sequencing is achieved by connecting EN2 to
PWRGD1. In this mode, regulator 2 starts once regulator
1 reaches regulation.
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
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
GND (R6 in Figure 4):
= OUT 1
equal to the ratio of the output voltages:
C SS 1 V
C SS 2 V OUT 2
Synchronization (FSYNC)
The MAX8855/MAX8855A operate from 500kHz to
2MHz using either its internal oscillator, or an externally
supplied clock. See the Setting the Switching
Frequency section.
MAX8855/
MAX8855A
R 6 =
LX_
0 . 6
( V OUT _ ? 0 . 6
L
C O
)
× R 4
R4
OUTPUT
R8
C11
Thermal-Overload Protection
Thermal-overload protection limits the total power dissi-
pation of the MAX8855/MAX8855A. Internal thermal sen-
FB_
COMP_
R7
C9
R6
sors monitor the junction temperature at each of the
regulators. When the junction temperature exceeds
+165°C, the corresponding regulator is shut down,
allowing the IC to cool. The thermal sensor turns the reg-
ulator on after the junction temperature cools by +20°C.
In a continuous thermal-overload condition, this results in
a pulsed output.
C10
Figure 4. Type III Compensation Network
12
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8855ETJ+ | 功能描述:直流/直流开关调节器 Dual 5A 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 |
| MAX8855ETJ+T | 功能描述:直流/直流开关调节器 Dual 5A 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 |
| MAX8855EVKIT+ | 功能描述:电源管理IC开发工具 MAX8855 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 |
| MAX8856ETD+ | 制造商:Maxim Integrated Products 功能描述:USB/AC ADAPTER, LI+ LINEAR BATTERY CHARGER WITH INTEGRATED - Bulk |
| MAX8856ETD+T | 功能描述:电池管理 USB/AC Adapter Li+ Linear Bat Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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