- 您现在的位置：买卖IC网 > PDF目录1841 > MAX1951AESA+T (Maxim Integrated Products)IC REG BUCK SYNC ADJ 2A 8SOIC PDF资料下载
参数资料
| 型号： | MAX1951AESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 2A |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
1MHz, 2A, 2.6V to 5.5V Input, PWM DC-DC
Step-Down Regulator with Enable
R LOAD = V OUT /I OUT(MAX) = 1.5V/2A = 0.75 ?
fp MOD = [1/(2 π x C OUT x (R LOAD + R ESR )]
= [1/(2 x π x10 x10 -6 x (0.75 + 0.01)] = 20.9Hz.
fz ESR = [1/(2 π x C OUT x R ESR )]
= [1/(2 x π x 10 x10 -6 x 0.01)] = 1.59MHz.
For a 2μH output inductor, pick the closed-loop unity-
gain crossover frequency (f C ) at 200kHz. Determine the
power modulator gain at f C :
G MOD(fc) = gmc x R LOAD x fp MOD /f C = 4.2 x 0.75 x
20.9kHz/200kHz = 0.33
then:
R 1 = V O x K/(g mEA x V FB x G MOD(fC) ) = (1.5 x
0.55)/(60 x 10 -6 x 0.8 x 0.33) ≈ 52.3k ? (1%)
C 2 = (2 x V OUT x C OUT )/R 1 x I OUT(MAX)
= (2 x 1.5 x 10 x 10 -6 )/(52.3k ? x 2)
≈ 143pF, choose 150pF, 10%
Applications Information
PCB Layout Considerations
Careful PCB layout is critical to achieve clean and sta-
ble operation. The switching power stage requires par-
ticular attention. Follow these guidelines for good PCB
layout:
1) Place decoupling capacitors as close as possible to
the IC. Keep the power ground plane (connected to
PGND) and signal ground plane (connected to
GND) separate.
2) Connect input and output capacitors to the power
ground plane; connect all other capacitors to the
signal ground plane.
3) Keep the high-current paths as short and wide as
possible. Keep the path of switching current (C1 to IN
and C1 to PGND) short. Avoid vias in the switching
paths.
4) If possible, 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 as close as pos-
sible to the IC.
6) Route high-speed switching nodes away from sensi-
tive analog areas (FB, COMP).
Thermal Considerations
See the MAX1951A Evaluation Kit for an optimized lay-
out example. Thermal performance can be further
improved with one of the following options:
1) Increase the copper areas connected to GND, LX,
and IN.
2) Provide thermal vias next to GND and IN, to the
ground plane and power plane on the back side of
PCB with openings in the solder mask next to the
vias to provide better thermal conduction.
3) Provide forced-air cooling to further reduce case
temperature.
10
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1951ESA+W | IC REG BUCK SYNC ADJ 2A 8SOIC |
| MAX1954AEUB+T | IC REG CTRLR BUCK PWM CM 10-UMAX |
| MAX1954EUB+ | IC REG CTRLR BUCK PWM CM 10-UMAX |
| MAX1956ETI+T | IC REG CTRLR BUCK PWM VM 28-TQFN |
| MAX1961EEP+ | IC REG CTRLR BUCK PWM VM 20-QSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1951ESA | 功能描述:直流/直流开关调节器 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 |
| MAX1951ESA+ | 功能描述:直流/直流开关调节器 1MHz 2A 2.6-5.5V PWM DC/DC Step-Down 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 |
| MAX1951ESA+T | 功能描述:直流/直流开关调节器 1MHz 2A 2.6-5.5V PWM DC/DC Step-Down 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 |
| MAX1951ESA+TW | 功能描述:直流/直流开关调节器 1MHz 2A 2.6-5.5V PWM DC/DC Step-Down 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 |
| MAX1951ESA+W | 功能描述:直流/直流开关调节器 1MHz 2A 2.6-5.5V PWM DC/DC Step-Down 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 |
发布紧急采购，3分钟左右您将得到回复。