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参数资料
| 型号： | MAX8855ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/20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
The power-good, open-drain output for regulator 2
(PWRGD2) is high impedance when V SS2 ≥ 0.54V and
V FB2 ≥ 0.9 x V SS2 . PWRGD2 is low when V SS2 < 0.54V,
THERM
EN2 is low, V VDD or V IN2 is below V UVLO , the thermal-over-
IN1
SHDN
load protection is activated, or when V FB2 < 0.9 x V SS2 .
External Reference Input (REFIN)
The MAX8855/MAX8855A have an external reference
RRUVB
UVLO
UVLO
TLIM
REG1 ON
input. Connect an external reference between 0 and
V VDD - 1.6V to REFIN to set the FB1 regulation voltage.
To use the internal 0.6V reference, connect REFIN to
SS1. When the IC is shut down, REFIN is pulled to GND
BIAS
GEN
V DD
through 335 Ω .
Startup and Sequencing
EN1
EN2
REF
REF
RDY
UVLO
RRUVB
The MAX8855/MAX8855A feature separate enable
inputs (EN1 and EN2) for the two regulators. Driving
EN_ high enables the corresponding regulator; driving
UVLO
UVLO
REG2 ON
EN_ low turns the regulator off. Driving both EN1 and
EN2 low puts the IC in low-power shutdown mode,
RRUVB
TLIM
reducing the supply current typically to 30nA. The
MAX8855/MAX8855A regulators power up when the fol-
lowing conditions are met (see Figure 2):
? EN_ is logic-high.
IN2
THERM
SHDN
?
?
?
V VDD is above the UVLO threshold.
V IN_ is above the UVLO threshold.
The internal reference is powered.
Figure 2. Startup Control Diagram
charged with a constant 8μA current source so that its
? The IC is not in thermal overload (T J < +165°C).
Once these conditions are met, the MAX8855/
MAX8855A begin soft-start. FB2 regulates to the volt-
age at SS2. During soft-start, the SS2 capacitor is
voltage ramps up for the soft-start time. See the Setting
the Soft-Start Time section to select the SS2 capacitor
for the desired soft-start time. FB1 regulates to the volt-
age at REFIN. Connect REFIN to SS1 to use the internal
EN1
OUT1
PWRGD1
EN2
OUT2
PWRGD2
10k Ω
10k Ω
PWRGD1
V DD
PWRGD2
SS1
EN1
EN2
SS2
REFIN
EN1
EN2
Figure 3a. Startup and Sequencing Options—Two Independent Output Startup and Shutdown Waveforms
10
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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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