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参数资料
| 型号： | MAX15112EVKIT# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/23页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT STEP-DOWN 12A MAX15112 |
| 产品培训模块： | 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 |
| 功率 - 输出： | 18W |
| 输出电压： | 1.5V |
| 电流 - 输出： | 12A |
| 输入电压： | 2.7 V ~ 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： | MAX15112 |
MAX15112
High-Efficiency, 12A, Current-Mode Synchronous
Step-Down Regulator with Integrated Switches
Error Amplifier
A high-gain transconductance error amplifier provides
accuracy for the voltage-feedback loop regulation.
Connect the necessary compensation network between
COMP and GND (see the Compensation Design
Guidelines section). The error-amplifier transconduc-
tance is 1.1mS (typ). COMP clamp low is set to 0.91V
(typ), just below the slope ramp compensation valley,
helping COMP to rapidly return to the correct set point
during load and line transients.
Ground-Sense Amplifier
The MAX15112 features a ground-sense amplifier to pre-
vent output voltage droop under heavy load conditions.
Connect GSNS to the negative terminal of the load output
capacitor to properly Kelvin-sense the output ground.
Route the GSNS trace away from the switching nodes.
PWM Comparator
The PWM comparator compares the COMP voltage to
the current-derived ramp waveform (COMP voltage to LX
current transconductance value is 80A/V, typ). To avoid
instability due to subharmonic oscillations when the duty
cycle is around 50% or higher, a slope compensation
ramp is added to the current-derived ramp waveform.
The compensation ramp slope is designed to ensure
stable operation at any duty cycle up to 94%.
Overcurrent Protection and Hiccup Mode
When the converter output is shorted or the device is
overloaded, each high-side MOSFET current-limit event
turns off the high-side MOSFET and turns on the low-side
MOSFET. On each current-limit event (either high-side
or low-side) a 3-bit counter is incremented. The counter
is reset after three consecutive switching cycles that do
not reach the current limit. If the current-limit condition
persists, the counter fills up reaching eight events. The
control logic then keeps the low-side MOSFET turned on
until the inductor current is fully discharged to avoid high
The control logic turns off both high-side and low-side
MOSFETs and waits for the hiccup period (1024 clock
cycles, typ) before attempting a new soft-start sequence.
The hiccup mode is also enabled during soft-start time.
Thermal Shutdown Protection
The MAX15112 contains an internal thermal sensor that
limits the total power dissipation to protect the device in
the event of an extended thermal fault condition. When
the die temperature exceeds +150 N C (typ), the thermal
sensor shuts down the device, turning off the DC-DC
converter to allow the die to cool. After the die tempera-
ture falls by 20 N C (typ), the device restarts.
Skip Mode Operation
The MAX15112 features selectable skip mode operation
when SKIP is connected to EN. When in skip mode, the
LX output becomes high impedance when the inductor
current falls below 0.5A (typ). The inductor current does
not become negative. If during a clock cycle the inductor
current falls below the 0.5A threshold (during off-time),
the low-side turns off. At the next clock cycle, if the
output voltage is above set point, the PWM logic keeps
both high-side and low-side MOSFETs off. If instead the
output voltage is below the set point, the PWM logic
drives the high-side on until a reduced current limit
threshold (3A, typ) is reached. In this way the system can
skip cycles, reducing the frequency of operation, and
switches only as needed to service load at the cost of
an increase in output voltage ripple (see the Skip Mode
Frequency and Output Ripple section). In skip mode,
power dissipation is reduced and efficiency is improved
at light loads because power MOSFETs do not switch at
every clock cycle.
The MAX15112 automatically enters continuous mode
regardless of the state of SKIP when the load current
increases beyond the skip mode current limit.
Do not change the state of SKIP when EN is high.
currents circulating through the low-side body diode.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15112EVKIT# | 功能描述:电源管理IC开发工具 MAX15112 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 |
| MAX15112EVKIT+ | 功能描述:直流/直流开关调节器 12A Buck Converter with Integrated Switches 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 |
| MAX15112EWG+ | 功能描述:直流/直流开关调节器 12A w/Internal 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 |
| MAX15112EWG+T | 功能描述:直流/直流开关调节器 12A w/Internal 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 |
| MAX15114GTM+ | 功能描述:直流/直流开关调节器 New 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 |
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