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| 型号： | MAX5099ATJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/27页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 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） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 17.1 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： | 是 |
| 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 Synchronous Buck
Converter with 80V Load-Dump Protection
Output Capacitor
The allowable output ripple voltage and the maximum
deviation of the output voltage during step load cur-
ESR OUT =
Δ V ESR
I STEP
C OUT = STEP RESPONSE
ESR OUT =
C OUT =
rents determine the output capacitance and its ESR.
The output ripple is comprised of Δ V Q (caused by the
capacitor discharge) and Δ V ESR (caused by the ESR of
the capacitor). Use low-ESR ceramic or aluminum elec-
trolytic capacitors at the output. For aluminum elec-
trolytic capacitors, the entire output ripple is
contributed by Δ V ESR . Use the ESR OUT equation to cal-
culate the ESR requirements 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 following equations:
Δ V ESR
Δ I L
Δ I L
8 × Δ V Q × f SW
I × t
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 MAX5099 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
Δ V O _ RIPPLE ? Δ V ESR + Δ V Q
L MIN =
V IN 2 × D
2 × f SW × V O × I OMIN
Δ I L is the peak-to-peak inductor current as calculated
where
above and f SW is the individual converter’s switching
frequency.
The allowable deviation of the output voltage during
D =
V O + V D ? V IN
V O + V D ? V DS
C IN =
Δ V ESR
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 converter.
The high switching frequency of the MAX5099 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 or poly-
mer and ceramic capacitors for better transient load
and ripple/noise performance. Keep the maximum out-
put-voltage deviation within the tolerable limits of the
electronics 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:
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 MOSFET switch. Select the inductor
with low DC resistance and with a saturation 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:
Δ I L
8 × f SW × Δ V Q
ESR =
Δ I L
______________________________________________________________________________________
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| 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 |
| MAX509ACAP | 功能描述:数模转换器- DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| MAX509ACAP+ | 功能描述:数模转换器- DAC 8-Bit 4Ch Precision DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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