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4V to 72V Input LDOs with Boost Preregulator
P DISS includes the losses in the boost converter opera-
MAXIMUM POWER DISSIPATION
vs. AMBIENT TEMPERATURE
3.0
2.5
2.0
1.5
1.0
0.5
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
AMBIENT TEMPERATURE ( ° C)
Figure 8. MAX5092/MAX5093 Package Power Dissipation
Maximum Output Current (I OUT_MAX )
The MAX5092_/MAX5093_ high input voltage (+72V
max) provides up to 250mA of current from OUT.
Package power-dissipation limits the amount of output
current available for a given input/output voltage and
ambient temperature. Figure 8 depicts the maximum
power-dissipation curve for the devices. The graph
assumes that the exposed metal pad of the IC package
is soldered to the PCB copper according to the JEDEC
51 standard (multilayer board). Use Figure 8 to deter-
mine the allowable package dissipation for a given
ambient temperature. Alternately, use the following for-
mula to calculate the allowable package dissipation
(P DISS ) in watts:
tion and the LDO itself. The boost converter loss
P LOSS(BST) , depends on V IN , V BSOUT , and I OUT . See
the Boost Converter Power Loss graphs in the Typical
Operating Characteristics to estimate the losses at a
given V IN and V BSOUT at room temperature. At a higher
ambient temperature of +105°C, P LOSS(BST) increases
by up to 20% due to higher R DS-ON and switching loss-
es of the internal boost converter MOSFET. (Note:
I OUT_MAX must be less than 250mA).
PCB Layout Guidelines
Good PCB layout and routing are required in high-fre-
quency switching power supplies to achieve proper
regulation and stability. It is strongly recommended that
the evaluation kit PCB layouts be followed as closely as
possible. Refer to the MAX5092 EV kit for an example
layout. Follow these guidelines for good PCB layout:
1) For SGND, use a large copper plane under the IC
and solder it to the exposed paddle. To effectively
use this copper area as a heat exchanger between
the PCB and ambient, expose this copper area on
the top and bottom side of the PCB. Do not make a
direct connection from the EP copper plane to pin 3
(SGND) underneath the IC so as to minimize
ground bounce.
2) Isolate the power components and high-current
path from the sensitive analog circuit.
3) Keep the high-current paths short, especially at the
ground terminals. This practice is essential for sta-
ble, jitter-free operation.
4) Connect the return terminals of input capacitors
and boost output capacitors to the PGND_BST
power ground plane. Connect the power ground
For T A ≤ +70°C:
P DISS = 2.67
(PGND_BST) and signal ground (SGND) planes
together at the negative terminal of the input capac-
itors. Do not connect them anywhere else. Connect
For +70°C < T A ≤ +125°C:
P DISS = 2.67 - (0.0333 x (T A - 70))
where +70°C < T A ≤ +125°C and 0.0333W/°C is the
package thermal derating. After determining the allow-
able package dissipation, calculate the maximum out-
put current (I OUT_MAX ) using the following formula:
PGND_LDO ground plane to SGND ground plane
at a single point.
5) Ensure that the feedback connections are short and
direct. Ensure a low-impedance path between
BSFB and SGND to limit the transient at BSFB to
100mV.
I OUT _ MAX =
P DISS ? P LOSS(BST)
V IN ? V OUT
6) Route high-speed switching nodes away from the
sensitive analog areas. Use the internal PCB layer
for SGND as an EMI shield to keep radiated noise
away from the IC, feedback dividers, and bypass
where P DISS is the allowable package power dissipa-
tion and P LOSS(BST) is the boost converter power loss.
capacitors.
20
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相关代理商/技术参数
MAX5093
制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:4V to 72V Input LDOs with Boost Preregulator
MAX5093AATE+
功能描述:低压差稳压器 - LDO 4V to 72V LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
MAX5093AATE+T
功能描述:低压差稳压器 - LDO 4V to 72V LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
MAX5093BATE+
功能描述:低压差稳压器 - LDO 4V to 72V LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
MAX5093BATE+T
功能描述:低压差稳压器 - LDO 4V to 72V LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
MAX5094A
制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:High-Performance, Single-Ended, Current-Mode PWM Controllers
MAX5094AASA
功能描述:电流型 PWM 控制器 Single-Ended RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
MAX5094AASA+
功能描述:电流型 PWM 控制器 Single-Ended RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14