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参数资料
| 型号： | MAX15023EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MAX15023 CTLR |
| 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： | 2，非隔离 |
| 输出电压： | 1.2V，3.3V |
| 电流 - 输出： | 10A，5A |
| 输入电压： | 9 ~ 16 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： | MAX15023 |
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MAX15023
Wide 4.5V to 28V Input, Dual-Output
Synchronous Buck Controller
In case of a nonideal short circuit applied at the output,
the output voltage equals the output impedance times the
limited inductor current during this phase. After reaching
The maximum voltage conversion ratio is limited by the
maximum duty cycle (D max ):
< D max ? max DROP2 max DROP1
the maximum allowable limit of the soft-start duration
(twice the normal soft-start time), the controller remains off
for 7936 clock cycles before trying to soft-start again.
V OUT
V IN
D × V + (1 ? D ) × V
V IN
Undervoltage Lockout
The MAX15023 has an internal undervoltage lockout
(UVLO) circuit to monitor the voltage on V CC . The
UVLO circuit prevents the MAX15023 from operating if
the voltages for the MOSFET drivers or for the internal
control functions are too low. The V CC falling threshold
is 3.8V (typ), with 430mV hysteresis to prevent chatter-
ing on the rising/falling edge of the supply voltage.
Before V CC reaches UVLO rising threshold voltage,
DL_ and DH_ stay low to inhibit switching.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation
in the MAX15023. When the device’s die-junction tem-
perature exceeds T J = +150°C, an on-chip thermal sen-
sor shuts down the device, forcing DL_ and DH_ low,
allowing the IC to cool. The thermal sensor turns the
where V DROP1 is the sum of the parasitic voltage drops
in the inductor discharge path, including synchronous
rectifier, inductor, and PCB resistances. V DROP2 is the
sum of the voltage drops in the charging path, includ-
ing high-side switch, inductor, and PCB resistances. In
practice, the above condition should be met with ade-
quate margin for good load-transient response.
Setting the Enable Input (EN_)
Each controller has an enable input referenced to an
analog voltage (1.2V). When the voltage exceeds 1.2V,
the regulator is enabled. To set a specific turn-on
threshold that can act as a secondary UVLO, a resistive
divider circuit can be used (see Figure 2)
Select R 2 (EN_ to SGND resistor) to a value lower than
200k ? . Calculate R 1 (V MON to EN_ resistor) with the fol-
lowing equation:
? ? ? V EN _ H _ ?
device on again after the junction temperature cools by
20°C. During thermal shutdown, the regulators shut
down, and soft-start is reset. Thermal-overload protection
can be triggered by power dissipation in the LDO regula-
tor, by excessive driving losses, or by both. Therefore,
carefully evaluate the total power dissipation (see the
Power Dissipation section) to avoid unwanted triggering
of the thermal-overload protection in normal operation.
Design Procedure
Effective Input Voltage Range
Although the MAX15023 controllers can operate from
input supplies up to 28V and regulate down to 0.6V, the
minimum voltage conversion ratio (V OUT /V IN ) might be
limited by the minimum controllable on-time. For proper
fixed-frequency PWM operation, the voltage conversion
ratio should obey the following condition:
? ? V MON ?
R 1 = R 2 ? ? ?
where V EN_H_ = 1.2V (typical).
EN_
?
? 1 ?
? ?
V MON
R 1
R 2
V OUT
V I N
> t ON(MIN) × f SW
MA15023
where t ON(MIN) is 100ns (max) and f SW is the switching
frequency in Hertz. If the desired voltage conversion
does not meet the above condition, then pulse skipping
occurs to decrease the effective duty cycle. To avoid
this, decrease the switching frequency or lower the
input voltage V IN .
16
Figure 2. Adjustable Enable Voltage
Maxim Integrated
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| MAX15023EVKIT+ | 功能描述:电源管理IC开发工具 MAX15023 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 |
| MAX15024AATB/V+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX15024AATB/V+T | 功能描述:功率驱动器IC Single Low Side RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX15024AATB+ | 制造商:Maxim Integrated Products 功能描述:SINGLE/DUAL, 16NS, HIGH SINK/SOURCE CURRENT GATE DRIVERS - Rail/Tube |
| MAX15024AATB+T | 功能描述:功率驱动器IC Single Low Side RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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