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参数资料
| 型号： | MAX5081ATE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 16TQFN |
| 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） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.23 V ~ 32 V |
| 输入电压： | 7.5 V ~ 40 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 250kHz |
| 电流 - 输出： | 1A |
| 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： | 16-WQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
1A, 40V, MAXPower Step-Down
DC-DC Converters
The power dissipated in the device is the sum of the
C8
power dissipated from supply current (P Q ), transition
losses due to switching the internal power MOSFET
R5
C7
(P SW ), and the power dissipated due to the RMS cur-
V OUT
C6
R3
R6
rent through the internal power MOSFET (P MOSFET ).
The total power dissipated in the package must be lim-
ited such that the junction temperature does not
exceed its absolute maximum rating of +150°C at maxi-
P MOSFET = I = RMS _ MOSFET 2 x R ON ON
GAIN
R4
REF
EA
COMP
mum ambient temperature. Calculate the power lost in
the MAX5080/MAX5081 using the following equations:
The power loss through the switch:
P MOSFET I RMS_MOSFET 2 x R
? I 2 PK + ( I
?
PK DC ) + I DC ? ? ×
× I
(dB)
CLOSED-LOOP
GAIN
EA
GAIN
I RMS _ MOSFET =
? ?
2
D
3
I PK = I OUT +
? I P ? P
2
f Z1 f Z2
f P2
f C
f P3
FREQUENCY
I DC = I OUT ?
? I P ? P
2
R ON is the on-resistance of the internal power MOSFET
Figure 4. Error Amplifier Compensation Circuit (Closed-Loop
and Error Amplifier Gain Plot) for Higher ESR Output Capacitors
(see Electrical Characteristics ).
The power loss due to switching the internal MOSFET:
Since R3 >> R6, R3 + R6 can be approximated as R3.
R3 is then calculated as:
P SW =
V IN × I OUT × ( t R × t F ) × f SW
4
R 3 ≈
1
2 π × f LC × C 6
where t R and t F are the rise and fall times of the internal
power MOSFET measured at LX.
The power loss due to the switching supply current
f P3 is set at 5xf C . Therefore, C8 is calculated as:
(I SW ):
C 8 =
C 7
( 2 π × C 7 × R 5 × f P3 ? 1 )
Power Dissipation
P Q = V IN x I SW
The total power dissipated in the device will be:
P TOTAL = P MOSFET + P SW + P Q
The MAX5080/MAX5081 is available in a thermally
enhanced package and can dissipate up to 2.7W at T A
= +70°C. When the die temperature reaches +160°C,
the part shuts down and is allowed to cool. After the
parts cool by 20°C, the device restarts with a soft-start.
TRANSISTOR COUNT: 4300
PROCESS: BiCMOS/DMOS
Chip Information
______________________________________________________________________________________
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5081ATE+ | 功能描述:直流/直流开关转换器 1A 40V MAXPower Step-Down 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 |
| MAX5081ATE+T | 功能描述:直流/直流开关转换器 1A 40V MAXPower Step-Down 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 |
| MAX5081ATE-T | 功能描述:直流/直流开关转换器 1A 40V MAXPower Step-Down 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 |
| MAX5082 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1.5A, 40V, MAXPower Step-Down DC-DC Converters |
| MAX5082ATE | 功能描述:直流/直流开关转换器 1A 40V MAXPower Step-Down 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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