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参数资料
| 型号： | MAX8643AETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 3.2 V |
| 输入电压： | 2.35 V ~ 3.6 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 500kHz ~ 2MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
3A, 2MHz Step-Down Regulator
with Integrated Switches
where C O is the output capacitor, V O is the output volt-
age, t SS is the soft-start time set by the soft-start capacitor
C SS , and I P-P is the peak-to-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 the Starting into
Prebias Output waveform in the Typical Operating
Characteristics section for an example selection of the
above parameters. Connecting the PREBIAS pin to GND
disables the prebias soft-start feature and causes the
MAX8643A to discharge any voltage present on the out-
put capacitors and then commence its soft-start.
PCB Layout Considerations and
Thermal Performance
Careful PCB layout is critical to achieve clean and stable
4) Connect IN, LX, and PGND separately to a large
copper area to help cool the IC to further improve
efficiency and long-term reliability.
5) Ensure all feedback connections are short and
direct. Place the feedback resistors and compensa-
tion components as close to the IC as possible.
6) Route high-speed switching nodes, such as LX,
away from sensitive analog areas (FB, COMP).
Pin Configuration
TOP VIEW
operation. It is highly recommended to duplicate the
MAX8643 EV kit layout for optimum performance. If devia-
18
17
16
15
14
13
tion is necessary, follow these guidelines for good PCB
layout:
PGND 19
PGND 20
12 PWRGD
11 FREQ
1) Connect input and output capacitors to the power
ground plane; connect all other capacitors to the sig-
nal ground plane.
IN 21
IN 22
MAX8643A
10 OUT
9 FB
2) Place capacitors on V DD , V IN , and SS as close as
possible to the IC and its corresponding pin using
direct traces. Keep power ground plane (connected
to PGND) and signal ground plane (connected to
IN 23
EN 24
+
1
*EP
2
3
4
5
6
8
7
COMP
GND
GND) separate.
3) Keep the high-current paths as short and wide as
possible. Keep the path of switching current short
and minimize the loop area formed by LX, the out-
put capacitors, and the input capacitors.
*EP = EXPOSED PAD.
THIN QFN
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8643AETG/V+ | 功能描述:直流/直流开关调节器 3A 2MHz Step-Down Regulator w/Switch 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 |
| MAX8643AETG/V+T | 功能描述:直流/直流开关调节器 3A 2MHz Step-Down Regulator w/Switch 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 |
| MAX8643AETG+ | 功能描述:直流/直流开关调节器 3A 2MHz Step-Down Regulator w/Switch 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 |
| MAX8643AETG+T | 功能描述:直流/直流开关调节器 3A 2MHz Step-Down Regulator w/Switch 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 |
| MAX8643ETG+ | 功能描述:直流/直流开关调节器 3A 2MHz Step-Down Regulator w/Switch 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 |
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