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| 型号： | MAX5098AATJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/28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： | 2,500 |
| 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： | 带卷 (TR) |
| 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
D = O D IN
where
Δ V O _ RIPPLE ? Δ V ESR + Δ V Q
Δ I L is the peak-to-peak inductor current as calculated
above and f SW is the individual converter’s switching
frequency.
The allowable deviation of the output voltage during
fast transient loads also determines the output capaci-
tance and its ESR. The output capacitor supplies the
step load current until the controller responds with a
greater duty cycle. The response time (t RESPONSE )
depends on the closed-loop bandwidth of the convert-
er. The high switching frequency of the MAX5098A
allows for higher closed-loop bandwidth, reducing
t RESPONSE and the output capacitance requirement.
The resistive drop across the output capacitor ESR and
the capacitor discharge causes a voltage droop during
where
V + V ? V
V O + V D ? V DS
The V D is the forward voltage drop of the external
Schottky diode, D is the duty cycle, and V DS is the volt-
age drop across the internal MOSFET switch. Select
the inductor with low DC resistance and with a satura-
tion current (I SAT ) rating higher than the peak switch
current limit of 4.3A (I CL1 ) and 2.6A (I CL2 ) of converter
1 and converter 2, respectively.
Input Capacitor
The input current for the boost converter is continuous
and the RMS ripple current at the input is low. Calculate
the capacitor value and ESR of the input capacitor
using the following equations.
a step load. Use a combination of low-ESR tantalum or
polymer and ceramic capacitors for better transient
load and ripple/noise performance. Keep the maximum
output voltage deviation within the tolerable limits of the
electronics being powered. When using a ceramic
capacitor, assume 80% and 20% contribution from the
C IN =
ESR =
Δ I L
8 × f SW × Δ V Q
Δ V ESR
Δ I L
ESR OUT =
C OUT =
( V IN ? V DS ) × D
Δ I L =
Δ V ESR
C OUT = O MAX
output capacitance discharge and the ESR drop,
respectively. Use the following equations to calculate
the required ESR and capacitance value:
Δ V ESR
I STEP
I STEP × t RESPONSE
Δ V Q
where I STEP is the load step and t RESPONSE is the
response time of the controller. Controller response
time depends on the control-loop bandwidth.
Boost Converter
The MAX5098A can be configured for step-up conver-
sion since the internal MOSFET can be used as a low-
side switch. Use the following equations to calculate
the values for the inductor (L MIN ), input capacitor (C IN ),
and output capacitor (C OUT ) when using the converter
in boost operation.
Inductor
Choose the minimum inductor value so the converter
remains in continuous mode operation at minimum out-
put current (I OMIN ).
where
L × f SW
where V DS is the voltage drop across the internal
MOSFET switch. Δ I L is the peak-to-peak inductor ripple
current as calculated above. Δ V Q is the portion of input
ripple due to the capacitor discharge and Δ V ESR is the
contribution due to ESR of the capacitor.
Output Capacitor
For the boost converter, the output capacitor supplies
the load current when the main switch is ON. The
required output capacitance is high, especially at high-
er duty cycles. Also, the output capacitor ESR needs to
be low enough to minimize the voltage drop due to the
ESR while supporting the load current. Use the follow-
ing equation to calculate the output capacitor for a
specified output ripple tolerance.
ESR =
I PK
I × D
Δ V Q × f SW
L MIN =
V IN 2 × D
2 × f SW × V O × I OMIN
where I PK is the peak inductor current as defined in the
Power Dissipation section for the boost converter, I O is
the load current, Δ V Q is the portion of the ripple due to
20
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相关代理商/技术参数 |
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|---|---|
| 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 |
| MAX5099ATJ+T | 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 |
| MAX5099EVKIT+ | 功能描述:电源管理IC开发工具 MAX5098A/99 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 |
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