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参数资料
| 型号： | MAX5098AATJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/28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 ~ 0.85 V，4.5 V ~ 28 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： | 无 |
| 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 Buck or Boost
Converter with 80V Load-Dump Protection
the capacitor discharge, and Δ V ESR is the contribution
due to the ESR of the capacitor. D MAX is the maximum
duty cycle at minimum input voltage.
where V DS is the drop across the internal MOSFET and
η is the efficiency. See the Electrical Characteristics
table for the R ON(MAX) value.
Power Dissipation
The MAX5098A includes two internal power MOSFET
switches. The DC loss is a function of the RMS current in
P SW =
V O × I IN × ( t R + t F ) × f SW
4
I RMS = ?? I DC PK DC PK ) ?? × MAX
+ ( I
+ I
× I
= I
× R
P DC RMS DS ( ON ) MAX
Δ I L
I PK = I O +
V IN × I O × ( t R + t F ) × f SW
P SW =
the switch while the switching loss is a function of switch-
ing frequency and instantaneous switch voltage and cur-
rent. Use the following equations to calculate the RMS
current, DC loss, and switching loss of each converter.
The MAX5098A is available in a thermally enhanced
package and can dissipate up to 2.7W at +70°C ambient
temperature. The total power dissipation in the package
must be limited so that the operating junction tempera-
ture does not exceed its absolute maximum rating of
+150°C at maximum ambient temperature.
For the buck converter:
2 2 D
3
2
where
I DC = I O ?
2
Δ I L
2
4
See the Electrical Characteristics table for the
R ON(MAX) maximum value.
For the boost converter:
where t R and t F are rise and fall times of the internal
MOSFET. t F can be measured in the actual application.
The supply current in the MAX5098A is dependent on
the switching frequency. See the Typical Operating
Characteristics to find the supply current of the
MAX5098A at a given operating frequency. The power
dissipation (P S ) in the device due to supply current
(I SUPPLY ) is calculated using following equation.
P S = V INMAX x I SUPPLY
The total power dissipation P T in the device is:
P T = P DC1 + P DC2 + P SW1 + P SW2 + P S
where P DC1 and P DC2 are DC losses in converter 1 and
converter 2, respectively. P SW1 and P SW2 are switching
losses in converter 1 and converter 2, respectively.
Calculate the temperature rise of the die using the fol-
lowing equation:
T J = T C x (P T x θ JC )
where θ JC is the junction-to-case thermal impedance of
the package equal to +1.7°C/W. Solder the exposed
pad of the package to a large copper area to minimize
the case-to-ambient thermal impedance. Measure the
temperature of the copper area near the device at a
worst-case condition of power dissipation and use
+1.7°C/W as θ JC thermal impedance.
Compensation
The MAX5098A provides an internal transconductance
( I (
DC + I PK + I DC PK
× I
I RMS =
2 2
3
) ) × D MAX
amplifier with its inverting input and its output available
for external frequency compensation. The flexibility of
external compensation for each converter offers wide
I IN = O O
( V IN ? V DS ) × D
Δ I L =
Δ I L
Δ I L
I PK = I IN +
= I
× R
P DC RMS DS ( ON )( MAX )
V × I
V IN × η
L × f SW
I DC = I IN ?
2
2
2
selection of output filtering components, especially the
output capacitor. For cost-sensitive applications, use
aluminum electrolytic capacitors; for component size-
sensitive applications, use low-ESR tantalum, polymer,
or ceramic capacitors at the output. The high switching
frequency of MAX5098A allows use of ceramic capaci-
tors at the output.
Choose all the passive power components that meet
the output ripple, component size, and component cost
requirements. Choose the small-signal components for
the error amplifier to achieve the desired closed-loop
______________________________________________________________________________________
21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5098AATJ+ | 功能描述:直流/直流开关转换器 Dual 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 |
| MAX5098AATJ+T | 功能描述:直流/直流开关转换器 Dual 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 |
| MAX5099 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection |
| MAX5099ATJ | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual, 2.2MHz, Automotive Synchronous Buck Converter with 80V Load-Dump Protection |
| 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 |
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