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参数资料
| 型号： | MAX5098AATJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST ADJ 1A/2A 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），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 0.85 V，4.5 V ~ 28 V |
| 输入电压： | 4.5 V ~ 19 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz ~ 2.2MHz |
| 电流 - 输出： | 1A，2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°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） |
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Dual, 2.2MHz, Automotive Buck or Boost
Converter with 80V Load-Dump Protection
f C ≤
Target the unity-gain crossover frequency for:
f ZERO,RHP
5
6) Place the second pole f P 2 =
the switching frequency.
1
2 π × R F × C CF
at 1 / 2
2) Place a zero f Z 1 =
1
2 π × R F × C F
at 0 . 75 × f LC .
C CF =
( 2 π × 0 . 5 × f SW × R F × C F ) ? 1
C F
Load-Dump Protection MOSFET
C F =
1
2 π × 0 . 75 × f LC × R F
Select the external MOSFET with an adequate voltage
rating, V DSS , to withstand the maximum expected load-
dump input voltage. The on-resistance of the MOSFET,
where R F ≥ 10k Ω .
3) Calculate C I for a target crossover frequency, f C :
R DS(ON) , should be low enough to maintain a minimal
voltage drop at full load, limiting the power dissipation
of the MOSFET.
V OSC ? ? ( 1 ? D ) + ω C 2 L OUT C OUT ? ?
C I =
? ?
2
ω C R F V IN
During regular operation, the power dissipated by the
MOSFET is:
P NORMAL = I LOAD2 x R DS(ON)
where I LOAD is equal to the sum of both converters’
where ω C = 2 π x f C :
input currents.
4) Place a pole f P 1 =
1
2 π × R I × C I
at f ZERO , RHP .
The MOSFET operates in a saturation region during
load dump, with both high voltage and current applied.
Choose a suitable power MOSFET that can safely oper-
ate in the saturation region. Verify its capability to sup-
R I =
1
2 π × f ZERO , RHP × C I
port the downstream DC-DC converters input current
during the load-dump event by checking its safe oper-
ating area (SOA) characteristics. Since the transient
peak power dissipation on the MOSFET can be very
5) Place the second zero f Z 2 =
where
1
2 π × R 1 × C I
at f LC .
high during the load-dump event, also refer to the ther-
mal impedance graph given in the data sheet of the
power MOSFET to make sure its transient power dissi-
pation is kept within the recommended limits.
Improving Noise Immunity
R 1 =
1
2 π × f LC × C I
? R I
In applications where the MAX5098A is subject to noisy
environments, adjust the controller’s compensation to
improve the system’s noise immunity. In particular, high-
frequency noise coupled into the feedback loop causes
jittery duty cycles. One solution is to lower the crossover
frequency (see the Compensation section).
24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5098AATJ+ | 功能描述:直流/直流开关转换器 Dual 2.2MHz Buck or Boost Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX5098AATJ+T | 功能描述:直流/直流开关转换器 Dual 2.2MHz Buck or Boost Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX5099 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection |
| MAX5099ATJ | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection |
| MAX5099ATJ+ | 功能描述:直流/直流开关转换器 Dual 2.2MHz Synch Buck Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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