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参数资料
| 型号： | MAX5073ETI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/25页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST ADJ 1A/2A 28TQFN |
| 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： | 28-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
2.2MHz, Dual-Output Buck or Boost Converter
with Internal Power MOSFETs
G M =
V IN
V OSC
×
ESR
ESR + ( 2 π × f C × L OUT )
×
0 . 8
V OUT
V OUT
C CF
where V OSC is a peak-to-peak ramp amplitude equal
to 1V.
R I
R1
R F
C F
The transconductance error amplifier gain is:
C I
G E / A = g m × R F
The total loop gain at f C should be equal to 1
R2
V REF
-
g M
+
COMP
G M × G E / A = 1
Figure 7. Type III Compensation Network
or
V OSC ( ESR + 2 π × f C × L OUT ) V OUT
R F =
0 . 8 × V IN × g m × ESR
4) Place a zero at or below the LC double pole:
where:
C F =
1
2 π × 0 . 75 × f LC × R F
C F =
1
2 π × R F × f LC
and R F ≥ 10k ? .
4) Calculate C I for a target unity crossover frequency, f C :
5) Place a high-frequency pole at f P = 0.5 x f SW .
Procedure 2 (see Figure 7)
If the output capacitor used is a low-ESR ceramic type,
C I =
2 π × f C × L OUT × C OUT × V OSC
V IN × R F
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
5) Place a pole
( f P 1 =
1
2 π × R I × C I
)
at f ZERO,ESR .
f C f P
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
R I =
1
2 π × f ZERO , ESR × C I
the two zeros at or below the double pole to avoid the
conditional stability issue.
1) Select a crossover frequency:
6) Place a second zero, f Z2 , at 0.2 x f C or at f LC ,
whichever is lower.
f SW
f C ≤
20
2) Calculate the LC double-pole frequency, f LC :
1
f LC =
1
R 1 = ? R I
2 π × f Z 2 × C I
1
( f P 2 =
7) Place a second pole 2 π × R F × C CF
the switching frequency.
)
at 1/2
3) Place a zero
f Z =
2 π × L OUT × C OUT
1
at 0 . 75 × f LC
2 π × R F × C F
C CF =
C F
( 2 π × 0 . 5 × f SW × R F × C F ) ? 1
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5073ETI+ | 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 |
| MAX5073ETI+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 |
| MAX5073ETI-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 |
| MAX5073ETJ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5074AAUP+T | 制造商:Maxim Integrated Products 功能描述: |
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