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| 型号： | MAX5072ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/27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 ~ 28 V |
| 输入电压： | 4.5 V ~ 23 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 ~ 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） |
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2.2MHz, Dual-Output Buck or Boost
Converter with POR and Power-Fail Output
ripple of 100mV or less, yielding an ESR and capaci-
tance value of 20m ? and 6.8μF for 1.25MHz frequency.
Use a 100μF capacitor at low input voltages to avoid
possible undershoot below the undervoltage lockout
threshold during power-on and transient loading.
tronics being powered. When using a ceramic capaci-
tor, assume 80% and 20% contribution from the output
capacitance discharge and the ESR drop, respectively.
Use the following equations to calculate the required
ESR and capacitance value:
Output Capacitor Selection
The allowable output ripple voltage and the maximum
deviation of the output voltage during step load currents
determines the output capacitance and its ESR.
ESR OUT =
? V ESR
I STEP
C OUT = STEP RESPONSE
The output ripple is comprised of ? V Q (caused by the
capacitor discharge) and ? V ESR (caused by the ESR of
the capacitor). Use low-ESR ceramic or aluminum elec-
trolytic capacitors at the output. For aluminum electrolytic
capacitors, the entire output ripple is contributed by
? V ESR . Use the ESR OUT equation to calculate the ESR
requirement and choose the capacitor accordingly. If
using ceramic capacitors, assume the contribution to
the output ripple voltage from the ESR and the capacitor
discharge are equal. Calculate the output capacitance
and ESR required for a specified ripple using the follow-
ing equations:
I × t
? 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 MAX5072 can be configured for step-up conversion
since the internal MOSFET can be used as a low-side
switch. Use the following equations to calculate the
inductor (L MIN ), input capacitor (C IN ), and output capac-
ESR OUT =
? V ESR
? I L
itor (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-
where
C OUT =
? I L
8 × ? V Q × f SW
put current (I OMIN ).
V 2 IN × D × η
L MIN =
2 × f SW × V O × I OMIN
D = O D IN
? V O _ RIPPLE ? ? V ESR + ? V Q
where ? I L is the peak-to-peak inductor current as cal-
culated 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 MAX5072 allows for
higher closed-loop bandwidth, reducing t RESPONSE
and the output capacitance requirement. The resistive
drop across the output capacitor ESR and the capaci-
tor discharge causes a voltage droop during a step
load. Use a combination of low-ESR tantalum and
ceramic capacitors for better transient load and
ripple/noise performance. Keep the maximum output
voltage deviation above the tolerable limits of the elec-
where
V + V ? V
V O + V D ? V DS
and I OMIN = 0.25 x I O
The V D is the forward voltage drop of the external Schottky
diode, D is the duty cycle, and V DS is the voltage drop
across the internal switch. Select the inductor with low DC
resistance and with a saturation current (I SAT ) rating high-
er than the peak switch current limit of 4.5A and 2.2A 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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5072ETJ+ | 功能描述:直流/直流开关转换器 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 |
| MAX5072ETJ+T | 功能描述:直流/直流开关转换器 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 |
| MAX5072ETJ-T | 功能描述:直流/直流开关转换器 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 |
| MAX5072EVKIT | 功能描述:电源管理IC开发工具 2.2MHz Buck or Boost Converter 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 |
| MAX5073 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:2.2MHz, Dual-Output Buck or Boost Converter with Internal Power MOSFETs |
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