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参数资料
| 型号： | MAX5072ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/27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 ~ 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： | 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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2.2MHz, Dual-Output Buck or Boost
Converter with POR and Power-Fail Output
C IN =
? I L × D
4 × f SW × ? V Q
R 1
V OUT
ESR =
? V ESR
? I L
R 2
V REF
-
+
g M
COMP
R F
where
? I L
=
( V IN ? V DS ) × D
L × f SW
C F
C CF
where V DS is the total voltage drop across the internal
MOSFET plus the voltage drop across the inductor
ESR. ? I L is the peak-to-peak inductor ripple current as
calculated above. ? V Q is the portion of input ripple due
to the capacitor discharge and ? V ESR is the contribu-
Figure 7. Type II Compensation Network.
V OUT
C CF
tion due to ESR of the capacitor.
R I
R1
R F
C F
Output Capacitor Selection
For the boost converter, the output capacitor supplies
C I
the load current when the main switch is ON. The
required output capacitance is high, especially at high-
er duty cycles. Also, the output capacitor ESR needs to
R2
V REF
-
g M
+
COMP
be low enough to minimize the voltage drop due to the
ESR while supporting the load current. Use the follow-
ing equation to calculate the output capacitor for a
specified output ripple tolerance.
Figure 8. Type III Compensation Network
ESR =
? V ESR
I O
ent temperature. The total power dissipation in the pack-
age must be limited so the junction temperature does not
exceed its absolute maximum rating of +150°C at maxi-
mum ambient temperature.
C OUT = O MAX
I RMS DC PK DC PK )) × MAX
I × D
? V Q × f SW
I O is the load current, ? V Q is the portion of the ripple
due to the capacitor discharge and ? V ESR is the contri-
bution due to the ESR of the capacitor. D MAX is the
maximum duty cycle at minimum input voltage.
Power Dissipation
For the buck converter:
= ( I +I +(I × I
P DC = I 2 RMS × R DS(ON)MAX
where
2 2 D
3
The MAX5072 includes a high-frequency, low R DS_ON
switching MOSFET. At +85°C, the R DS_ON of the inter-
nal switch for converter 1 and converter 2 are 290m ?
and 630m ? , respectively. The DC loss is a function of
I DC = I O ?
? I L
2
the RMS current in the switch while the switching loss is
a function of switching frequency and input voltage. Use
the following equations to calculate the RMS current,
I PK = I O +
? I L
2
DC loss, and switching loss of each converter. The
MAX5072 device is available in a thermally enhanced
package and can dissipate up to 2.7W at +70°C ambi-
See the Electrical Characteristics table for the R DS(ON)MAX
value.
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5072ETJ+ | 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 |
| MAX5072ETJ+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 |
| MAX5072ETJ-T | 功能描述:直流/直流开关转换器 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 |
| MAX5072EVKIT | 功能描述:电源管理IC开发工具 2.2MHz Buck or Boost Converter 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 |
| MAX5073 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:2.2MHz, Dual-Output Buck or Boost Converter with Internal Power MOSFETs |
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