1A, 4.5V to 40V Input Buck Converters with
50mA Auxiliary LDO Regulators
C IN_LDO
C IN_SW
C DRAIN
R6
R3
V IN
4.5V TO 40V
D1
C8
C6
R5
C7
IN_LDO
IN_SW
DRAIN
COMP
BST
FB
C BST
L
R4
V IN
5V TO 40V
C F
EN_SW
EN_SYS
C+
C-
SS
MAX15015
MAX15016
LX
RESET
CT
D2
10k ?
V OUT1 AT 1A
C OUT
PGND
SGND
SYNC
LDO_OUT
V OUT2 AT 50mA
REG
C SS
C REG
1 ?
0.47 μ F
DVREG
PGND
SET_LDO
SGND
C CT
C LDO_OUT
Figure 6. MAX15015/MAX15016 Typical Application Circuit (4.5V to 40V Input Operation)
P SW = IN OUT R F SW
power dissipated due to the RMS current through the
internal power MOSFET (P MOSFET ). The total power
dissipated in the package must be limited such that the
junction temperature does not exceed its absolute max-
imum rating of +150°C at maximum ambient tempera-
ture. Calculate the power lost in the MAX15014 –
MAX15017 using the following equations:
The power loss through the switch:
P MOSFET = ( I RMS _ MOSFET ) 2 × R ON
R ON is the on-resistance of the internal power MOSFET
(see the Electrical Characteristics).
The power loss due to switching the internal MOSFET:
V × I × ( t + t ) × f
4
t R and t F are the rise and fall times of the internal power
MOSFET measured at LX.
× ? I PK + ( I PK DC ) + I DC ? ?
D ? 2 2
I RMS _ MOSFET =
3 ? ?
× I
The power loss due to the switching supply current (I SW ):
P Q = V IN _ SW × I SW
I PK = I OUT +
I DC = I OUT ?
? I P ? P
2
? I P ? P
2
The power loss due to the LDO regulator:
P LDO = ( V IN _ LDO ? V LDO _ OUT ) × I LDO _ OUT
D =
V OUT
V IN
The total power dissipated in the device will be:
P TOTAL = P MOSFET + P SW + P Q + P LDO
22
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相关代理商/技术参数
MAX15016AATX+ 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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
MAX15016AATX+T 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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
MAX15016BATX+ 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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
MAX15016BATX+T 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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
MAX15017AATX+ 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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
MAX15017AATX+T 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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
MAX15017BATX+ 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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
MAX15017BATX+T 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters 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