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参数资料
| 型号： | MAX5072ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/27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
The transconductance error-amplifier gain is:
Calculate C I for a target unity crossover frequency, f C :
G E / A = g m × R F
C I =
2 π × f C × L OUT × C OUT × V OSC
V IN × R F
The total loop gain at f C should be equal to 1
G M × G E / A = 1
Place a pole
(f P 1 =
1
2 π × R I × C I at f ZERO,ESR .
or
R F =
V OSC ( ESR + 2 π × f C × L OUT ) V OUT
0 . 8 × V IN × g m × ESR
1
R I =
2 π × f ZERO , ESR × C I
Place a second zero, f Z2 , at 0.2f C or at f LC , whichever
Place a zero at or below the LC double pole:
is lower.
C F =
1
2 π × R F × f LC
R 1 =
1
2 π × f Z 2 × C I
? R I
Place a high-frequency pole at f P = 0.5 x f SW .
Procedure 2 (See Figure 8):
If the output capacitor used is a low-ESR ceramic type,
Place a second pole
switching frequency.
( f P 2 =
1
2 π × R F × C CF
)
at 1/2 the
the ESR frequency is usually far away from the targeted
unity crossover frequency (f C ). In this case, Type III com-
pensation is recommended. Type III compensation pro-
vides two-pole zero pairs. The locations of the zero and
C CF =
C F
( 2 π × 0 . 5 × f SW × R F × C F ) ? 1
f C f P
f C ≤ SW
poles should be such that the phase margin peaks at f C .
= = 5
The f Z f C is a good number to get about 60 °
phase margin at f C . However, it is important to place
the two zeros at or below the double pole to avoid the
conditional stability issue.
Select a crossover frequency:
f
20
Calculate the LC double-pole frequency, f LC :
1
f LC =
2 π × L OUT × C OUT
Place a zero
Boost Converter Compensation
The boost converter compensation gets complicated
due to the presence of a right-half-plane zero
F ZERO,RHP . The right-half-plane zero causes a drop in-
phase while adding positive (+1) slope to the gain curve.
It is important to drop the gain significantly below unity
before the RHP frequency. Use the following procedure
to calculate the compensation components.
Calculate the LC double-pole frequency, f LC , and the
right half plane zero frequency.
1 ? D
f LC =
2 π × L OUT C OUT
( 1 ? D ) 2 R ( MIN )
f ZERO , RHP =
2 π × L OUT
where:
f Z =
1
2 π × R F × C F
at 0 . 75 × f LC
where:
D = 1 ?
V IN
V OUT
C F =
1
2 π × 0 . 75 × f LC × R F
R ( MIN ) =
V OUT
I OUT ( MAX )
and R F ≥ 10k ? .
Target the unity-gain crossover frequency for:
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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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