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参数资料
| 型号： | MAX15038EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX15038 |
| 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，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 4A |
| 输入电压： | 2.9 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX15038 |
4A, 2MHz Step-Down Regulator
with Integrated Switches
Power-Good Output (PWRGD)
PWRGD is an open-drain output that goes high imped-
ance when V FB is above 0.925 x V REFIN and V REFIN is
above 0.54V for at least 48 clock cycles. PWRGD pulls
Table 1. CTL1 and CTL2 Output Voltage
Selection
V OUT WHEN
low when V FB is below 90% of V REFIN or V REFIN is
below 0.54V for at least 48 clock cycles. PWRGD is low
CTL1
CTL2
V OUT (V)
USING
EXTERNAL
when the IC is in shutdown mode, V DD is below the
V REFIN (V)
internal UVLO threshold, or the IC is in thermal shut-
down mode.
Programming the Output Voltage
(CTL1, CTL2)
As shown in Table 1, the output voltage is pin program-
mable by the logic states of CTL1 and CTL2. CTL1 and
GND
V DD
GND
GND
GND
V DD
Unconnected
V DD
0.6* or
0.6 < V OUT
0.9 x V IN **
0.7
0.8
1.0
V REFIN * or
V REFIN < V OUT
0.9 x V IN **
V REFIN x (7/6)
V REFIN x (4/3)
V REFIN x (5/3)
CTL2 are trilevel inputs: V DD , unconnected, and GND.
An 8.06k Ω resistor must be connected between V OUT
and FB when CTL1 and CTL2 are connected to GND.
Unconnected GND
Unconnected Unconnected
1.2
1.5
V REFIN x 2
V REFIN x 2.5
The logic states of CTL1 and CTL2 should be pro-
grammed only before power-up. Once the part is
Unconnected
V DD
V DD
GND
1.8
2.0
V REFIN x 3
V REFIN x (10/3)
enabled, CTL1 and CTL2 should not be changed. If the
output voltage needs to be reprogrammed, cycle
power or EN and reprogram before enabling. The out-
put voltage can be programmed continuously from
0.6V to 90% of V IN by using a resistor-divider network
from V OUT to FB to GND as shown in Figure 3a. CTL1
and CTL2 must be connected to GND.
Shutdown Mode
V DD Unconnected 2.5 V REFIN x (25/6)
*Install an 8.06k Ω resistor at R3 and do not install a resistor at R4.
**Install R3 and R4 following the equation in the Compensation
Design section (see Figure 3a).
Inductor Selection
Choose an inductor with the following equation:
Drive EN to GND to shut down the IC and reduce quies-
cent current to a typical value of 10μA. During shutdown,
the LX is high impedance. Drive EN high to enable the
MAX15038.
L =
f S × V IN × LIR × I OUT ( MAX )
V OUT × ( V IN ? V OUT )
Thermal Protection
Thermal-overload protection limits total power dissipation
in the device. When the junction temperature exceeds
T J = +165°C, a thermal sensor forces the device into
shutdown, allowing the die to cool. The thermal sensor
turns the device on again after the junction temperature
cools by 20°C, causing a pulsed output during continu-
ous overload conditions. The soft-start sequence begins
after recovery from a thermal-shutdown condition.
Applications Information
IN and V DD Decoupling
To decrease the noise effects due to the high switching
frequency and maximize the output accuracy of
the MAX15038, decouple IN with a 22μF capacitor from
IN to PGND. Also, decouple V DD with a 2.2μF
low-ESR ceramic capacitor from V DD to GND. Place
these capacitors as close as possible to the IC.
where LIR is the ratio of the inductor ripple current to full
load current at the minimum duty cycle. Choose LIR
between 20% to 40% for best performance and stability.
Use an inductor with the lowest possible DC resistance
that fits in the allotted dimensions. Powdered iron ferrite
core types are often the best choice for performance.
With any core material, the core must be large enough
not to saturate at the current limit of the MAX15038.
Output-Capacitor Selection
The key selection parameters for the output capacitor
are capacitance, ESR, ESL, and voltage-rating require-
ments. These affect the overall stability, output ripple
voltage, and transient response of the DC-DC convert-
er. The output ripple occurs due to variations in the
charge stored in the output capacitor, the voltage drop
due to the capacitor’s ESR, and the voltage drop due to
the capacitor’s ESL. Estimate the output-voltage ripple
due to the output capacitance, ESR, and ESL:
V RIPPLE = V RIPPLE ( C ) + V RIPPLE ( ESR ) + V RIPPLE ( ESL )
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相关代理商/技术参数 |
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| MAX15038EVKIT+ | 功能描述:电源管理IC开发工具 4A 2MHz Step-Down w/Integrated Switch 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 |
| MAX15039ETG+ | 功能描述:直流/直流开关调节器 6A 2MHz Step-Down w/Integrated Switch RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX15039ETG+T | 功能描述:直流/直流开关调节器 6A 2MHz Step-Down w/Integrated Switch RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX15039EVKIT+ | 功能描述:电源管理IC开发工具 6A 2MHz Step-Down w/Integrated Switch 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 |
| MAX1503XETJ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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