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参数资料
| 型号： | MAX5099ATJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/27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： | 2,500 |
| 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： | 带卷 (TR) |
| 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
2) Place a zero f Z 1 =
1
2 π × R F × C F
at 0 . 75 × f LC .
Choose a suitable power MOSFET that can safely oper-
ate in the saturation region. Verify its capability to sup-
port the downstream DC-DC converters’ input current
during the load-dump event by checking its safe oper-
C F =
1
2 π × 0 . 75 × f LC × R F
ating area (SOA) characteristics.
Since the transient peak power dissipation on the
MOSFET can be very high during the load-dump event,
V OSC ? ? ( ) + ω C O O ? ?
?
?
ω C F IN
C I =
where R F ≥ 10kΩ.
3) Calculate C I for a target crossover frequency, f C :
2 2
1 ? D L C
R V
where ω C = 2 π x f C .
also refer to the thermal impedance graph given in the
data sheet of the power MOSFET to make sure its tran-
sient power dissipation is kept within the recommended
limits.
Improving Noise Immunity
In applications where the MAX5099 is subject to noisy
environments, adjust the controller’s compensation to
improve the system’s noise immunity. In particular, high-
4) Place a pole f P 1 =
1
2 π × R I × C I
at f ZERO , RHP
frequency noise coupled into the feedback loop causes
jittery duty cycles. One solution is to lower the crossover
frequency (see the Compensation section).
or 5 x f C , whichever is lower.
R I =
1
2 π × f × C I
V L
5) Place the second zero f Z 2 =
1
2 π × R 1 × C I
at f LC .
MAX5099
R 1 =
1
2 π × f LC × C I
? R I
VDRV
BST_/VDD_
6) Place the second pole at 1/2 the switching frequency.
PGND
V+
C CF =
C F
( 2 π × 0 . 5 × f SW × R F × C F ) ? 1
DRAIN_
VOUT_
Load-Dump Protection MOSFET
Select the external MOSFET with an adequate voltage
rating, V DSS , to withstand the maximum expected load-
dump input voltage. The on-resistance of the MOSFET,
R DS(ON) , should be low enough to maintain a minimal
voltage drop at full load, limiting the power dissipation
of the MOSFET.
During regular operation, the power dissipated by the
DRAIN_
*DL_
SOURCE_
SOURCE_
SGND
C OUT
MOSFET is:
P NORMAL = I LOAD2 x R DS(ON)
FB_
where I LOAD is equal to the sum of both converters’
input currents.
The MOSFET operates in a saturation region during
load dump, with both high voltage and current applied.
*LEAVE DL_ UNCONNECTED.
Figure 5. Boost Application
______________________________________________________________________________________
23
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| 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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| MAX509ACAP+T | 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 |
| MAX509ACAP-T | 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 |
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