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参数资料
| 型号： | MAX8855ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/20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
Set the second compensation pole at 1/2 the switching
frequency. Calculate C10 as follows:
?
A multilayer PCB is recommended. Use inner-layer
ground (and power) planes to minimize noise coupling.
C 10 =
1
π × R 7 × f S
?
Place the input ceramic decoupling capacitor
directly across and as close as possible to IN_ and
PGND_. This is to help contain the high switching
currents within a small loop.
The recommended range for R4 is 2k Ω to 10k Ω . Note
that the loop compensation remains unchanged if only
R6’s resistance is altered to set different outputs.
Safe-Starting into a Prebiased Output
The MAX8855/MAX8855A are capable of safe-starting
up into a prebiased output without discharging the out-
put capacitor. This type of operation is also termed
monotonic startup. However, in order to avoid output
voltage glitches during safe-start it should be ensured
that the inductor current is in continuous conduction
mode during the end of the soft-start period, this is
done by satisfying the following equation:
?
?
?
?
Connect IN_ and PGND_ separately to large copper
areas to help cool the IC and further improve effi-
ciency and long-term reliability.
Connect input, output, and VDL capacitors to the
power ground plane (PGND_).
Keep the path of switching currents short and mini-
mize the loop area formed by LX_, the output
capacitor(s), and the input capacitor(s).
Place the IC decoupling capacitors as close as
possible to the IC pins, connecting all other ground-
terminated capacitors, resistors, and passive com-
ponents to the reference or analog ground plane
≥ P ? P
C O ×
V O
t SS
I
2
?
(GND).
Separate the power and analog ground planes,
using a single-point common connection point (typi-
where C O is the output capacitor, V O is the output volt-
cally, at the C IN_ cathode.
age, t SS is the soft-start time set by the soft-start capac-
itor C SS , and I P-P is the peak inductor ripple current (as
defined in the Output-Capacitor Selection section).
Depending on the application, one of these parameters
may drive the selection of the others. See Starting into
Prebiased Output waveforms in the Typical Operating
Characteristics section for an example selection of the
above parameters.
Applications Information
PCB Layout Guidelines
Careful PCB layout is critical to achieve low switching
losses and clean, stable operation. The switching
power stage requires particular attention. It is highly
recommended to duplicate the MAX8855 EV kit layout
for optimum performance. If deviation is necessary, fol-
low these guidelines for a good PCB layout:
?
?
?
Connect the exposed pad to the analog ground
plane, allowing sufficient copper area to help cool
the device. If the exposed pad is used as a com-
mon PGND_-to-GND connection point, avoid run-
ning high current through the exposed pad by
using separate vias to connect the PGND_ pins to
the power ground plane rather than connecting
them to the exposed pad on the top layer.
Use caution when routing feedback and compensa-
tion node traces; avoid routing near high dV/dt
nodes (LX_) and high-current paths. Place the feed-
back and compensation components as close as
possible to the IC pins.
Reference the MAX8855 Evaluation Kit for an exam-
ple layout.
16
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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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