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参数资料
| 型号： | MAX5073ATI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/25页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST ADJ 1A/2A 28TQFN |
| 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 ~ 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： | 28-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
2.2MHz, Dual-Output Buck or Boost Converter
with Internal Power MOSFETs
Output Capacitors
The allowable output ripple voltage and the maximum
deviation of the output voltage during step load currents
determines the output capacitance and its ESR.
The output ripple is comprised of ? V Q (caused by the
being powered. When using a ceramic capacitor,
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:
capacitor discharge) and ? V ESR (caused by the ESR
of the capacitor). Use low-ESR ceramic or aluminum
electrolytic capacitors at the output. For aluminum
electrolytic capacitors, the entire output ripple is con-
ESR OUT =
? V ESR
I STEP
C OUT = STEP RESPONSE
tributed by ? V ESR . Use the ESR OUT equation to calcu-
late 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 rip-
ple using the following 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.
ESR OUT =
? V ESR
? I L
Boost Converter
The MAX5073 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
C OUT =
? I L
8 × ? V Q × f SW
inductor (L MIN ), input capacitor (C IN ), and output capac-
itor (C OUT ) when using the converter in boost operation.
Inductor
where
? V O _ RIPPLE ? ? V ESR + ? V Q
Choose the minimum inductor value so the converter
remains in continuous mode operation at minimum out-
put current (I OMIN ).
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-
where
L MIN =
V 2 IN × D × η
2 × f SW × V O × I OMIN
D = O D IN
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 MAX5073 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 volt-
age deviation above the tolerable limits of the electronics
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.
______________________________________________________________________________________
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5073ETI | 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 |
| MAX5073ETI+ | 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 |
| MAX5073ETI+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 |
| MAX5073ETI-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 |
| MAX5073ETJ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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