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| 型号： | MAX5089ATE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 16TQFN |
| 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： | 1 |
| 输出电压： | 0.6 V ~ 20 V |
| 输入电压： | 4.5 V ~ 23 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 312kHz ~ 2.1MHz |
| 电流 - 输出： | 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： | 16-WQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
2.2MHz, 2A Buck Converters with an
Integrated High-Side Switch
( V IN ? V OUT ) × V OUT
? I P ? P =
The input ripple comprises mainly of ? V Q (caused by the
capacitor discharge) and ? V ESR (caused by the ESR of
the input capacitor). The total voltage ripple is the sum of
? V Q and ? V ESR . Assume the input voltage ripple from
the ESR and the capacitor discharge is equal to 50%
each. The following equations show the ESR and capaci-
where:
V IN × f SW × L
V OUT _ RIPPLE ? ? V ESR + ? V Q
tor requirement for a target voltage ripple at the input:
? I P-P is the peak-to-peak inductor current as calculated
? ? I P ? P ?
? I OUT + ?
ESR =
C IN =
? V ESR
? 2 ?
I OUT × D ( 1 ? D )
? V Q × f SW
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 )
( V IN ? V OUT ) × V OUT
? I P ? P =
D = OUT
where
V
V IN
V IN × f SW × L
and
depends on the closed-loop bandwidth of the convert-
er. The high switching frequency of MAX5088/
MAX5089 allows for a higher closed-loop bandwidth,
thus reducing t RESPONSE and the output capacitance
requirement. The resistive drop across the output
capacitor’s ESR and the capacitor discharge causes a
voltage droop during a step load. Use a combination of
ESR OUT =
C OUT = STEP RESPONSE
? V ESR
? I P-P
? I P-P
8 × ? V Q SW
C OUT =
where I OUT is the output current, D is the duty cycle,
and f SW is the switching frequency. Use additional
input capacitance at lower input voltages to avoid pos-
sible undershoot below the UVLO threshold during
transient loading.
Output Capacitors
The allowable output voltage ripple and the maximum
deviation of the output voltage during step load cur-
rents determine the output capacitance and its ESR.
The output ripple comprises of ? V Q (caused by the
capacitor discharge) and ? V ESR (caused by the ESR of
the output capacitor). Use low-ESR ceramic or alu-
minum electrolytic capacitors at the output. For alu-
minum electrolytic capacitors, the entire output ripple is
contributed by ? V ESR . Use the ESR OUT equation to cal-
culate 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 to be equal. The following
equations show the output capacitance and ESR
requirement for a specified output voltage ripple.
ESR =
× f
low-ESR tantalum and ceramic capacitors for better
transient load and ripple/noise performance. Keep the
maximum output voltage deviation below the tolerable
limits of the electronics being powered. When using a
ceramic capacitor, assume an 80% and 20% contribu-
tion from the output capacitance discharge and the
ESR drop, respectively. Use the following equations to
calculate the required ESR and capacitance value:
? V ESR
I STEP
I × t
? V Q
where I STEP is the load step and t RESPONSE is the
response time of the controller. The controller response
time depends on the control-loop bandwidth.
Power Dissipation
The MAX5088/MAX5089 are available in thermally
enhanced 16-pin, 5mm x 5mm TQFN packages that
dissipate up to 2.7W at T A = +70°C. When the die tem-
perature reaches +170°C, the MAX5088/MAX5089 shut
down (see the Thermal-Overload Protection section).
The power dissipated in the device is the sum of the
power dissipated from supply current (P Q ), power dis-
sipated due to switching the internal power MOSFET
(P SW ), and the power dissipated due to the RMS cur-
______________________________________________________________________________________
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5089ATE+ | 功能描述:直流/直流开关转换器 2.2MHz 2A 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 |
| MAX5089ATE+T | 功能描述:直流/直流开关转换器 2.2MHz 2A 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 |
| MAX5089EVKIT | 功能描述:直流/直流开关转换器 MAX5089 Evaluation Kit 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 |
| MAX508ACPP | 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 |
| MAX508ACPP+ | 功能描述:数模转换器- DAC 12-Bit 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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