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| 型号： | MAX15015AEVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/26页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX15015A |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 3.3V，5V |
| 电流 - 输出： | 1A，50mA |
| 输入电压： | 4.5 ~ 40 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 500kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX15015A |
1A, 4.5V to 40V Input Buck Converters with
50mA Auxiliary LDO Regulators
The error amplifier gain between f P2 and f P3 is approxi-
mately equal to R5 / (R6 || R3).
The ESR zero frequency f ZESR might not be very much
higher than the double-pole frequency f LC , therefore
the value of R5 can be calculated as:
V IN_LDO
IN_LDO
LDO_OUT
R 5 =
R 3 × R 6
R 3 + R 6
×
f C 2
G MOD _ DC × f LC 2
MAX15014–
R1
C7 can still be calculated as:
MAX15017
SET_LDO
C 7 =
1
0 . 5 × 2 π × R 5 × f LC
SGND
R2
f P3 is set at 5xf C . Therefore, C8 is calculated as:
C 8 =
C 7
2 π × C 7 × R 5 × f P 3 ? 1
Figure 5. Setting the Output Voltage Using a Resistive Divider
Connect CT to LDO_OUT to select the internally fixed
Setting the LDO Linear
Regulator Output Voltage
The MAX15014–MAX15017 LDO regulator features Dual
Mode ? operation: it can operate in either a preset voltage
mode or an adjustable mode. In preset voltage mode,
internal trimmed feedback resistors set the internal linear
regulator to 3.3V or 5V (see the Selector Guide). Select
preset voltage mode by connecting SET_LDO to ground.
In adjustable mode, select an output voltage between
1.5V and 11V using two external resistors connected as a
voltage-divider to SET_LDO (see Figure 5). Set the output
voltage using the following equation:
timeout period. C CT must be low-leakage-type capaci-
tor. Ceramic capacitors are recommended; do not use
capacitors lower than 200pF to avoid the influence of
parasitic capacitances.
Capacitor Selection and
Regulator Stability
For stable operation over the full temperature range and
with load currents up to 50mA, use a 10μF (min) output
capacitor (C LDO_OUT ) with a maximum ESR of 0.4 ? . To
reduce noise and improve load-transient response, sta-
bility, and power-supply rejection, use larger output
capacitor values. Some ceramic dielectrics such as Z5U
V OUT = V SET _ LDO ? 1 +
R 2 ?
?
?
R 1 ?
?
and Y5V exhibit very large capacitance and ESR varia-
tion with temperature and are not recommended. With
X7R or X5R dielectrics, 15μF should be sufficient for
where V SET_LDO = 1.241V and the recommended value
for R2 is around 50k ? .
Setting the RESET Timeout Delay
The RESET timeout period is adjustable to accommo-
date a variety of μP applications. Adjust the RESET
timeout period by connecting a capacitor (C CT )
between CT and SGND.
operation over their rated temperature range. For higher-
ESR tantalum capacitors (up to 1 ? ), use 22μF or more to
maintain stability. To improve power-supply rejection
and transient response use a minimum 0.1μF capacitor
between IN_LDO and SGND.
Power Dissipation
The MAX15014–MAX15017 are available in a thermally
enhanced package and can dissipate up to 2.86W at
T A = +70°C. When the die temperature reaches
t RP =
C CT × V CT ? TH
I CT ? THQ
+160°C, the part shuts down and is allowed to cool.
After the die cools by 20°C, the device restarts with a
soft-start. The power dissipated in the device is the
where V CT-TH = delay comparator threshold (rising) =
1.241V (typ), I CT-THQ = CT charge current = 2 x 10 -6 A
(typ), t RP is in seconds and C CT is in Farads.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
sum of the power dissipated in the LDO, power dissi-
pated from supply current (P Q ), transition losses due to
switching the internal power MOSFET (P SW ), and the
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15015AEVKIT+ | 功能描述:电源管理IC开发工具 MAX15015A Eval Kit 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 |
| MAX15015BATX+ | 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 |
| MAX15015BATX+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 |
| MAX15015EVKIT | 功能描述:电源管理IC开发工具 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 |
| 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 |
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