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| 型号： | MAX15109EWP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 8A 20WLP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 可编程 |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 8A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 包装： | * |
| 供应商设备封装： | * |
High-Efficiency, 8A, Current-Mode Synchronous
Step-Down Switching Regulator with VID Control
Detailed Description
The MAX15109 high-efficiency, current-mode switch-
ing regulator delivers up to 8A of output current. The
regulator operates from 2.7V to 5.5V and provides a VID
selectable output.
The IC current-mode control architecture uses a high
gain transconductance error amplifier that facilitates an
easy compensation design and ensures cycle-by-cycle
current limit with fast response to line and load transients.
The regulator features a 1MHz fixed switching fre-
quency, allowing for all-ceramic capacitor designs with
fast transient responses. The high operating frequency
minimizes the size of external components. The IC is
available in a 2.5mm x 2mm (4 x 5 array), 0.5mm pitch
WLP package.
The regulator offers skip-mode functionality to reduce
current consumption and achieve a high efficiency at
light output loads. The low R DS(ON) integrated switches
ensure high efficiency at heavy loads while minimizing
critical inductance, making the layout design a much
simpler task than that of discrete solutions. The IC’s
simple layout and footprint assure first-pass success in
new designs.
The IC has output voltages of 0.9V, 0.8V, 0.725V, and
0.625V by configuring the VID inputs. The regulator
offers capacitor-programmable soft-start to reduce input
inrush current. The device safely starts up into a prebi-
ased output. The IC includes an enable input and open-
drain PGOOD output for sequencing with other devices.
Controller Function — PWM Logic
The controller logic block determines the duty cycle of
the high-side MOSFET under different line, load, and
temperature conditions. Under normal operation, where
the current-limit and temperature protection are not trig-
gered, the controller logic block takes the output from
the PWM comparator to generate the driver signals for
both high-side and low-side MOSFETs. The control logic
block controls the break-before-make logic and all the
necessary timing.
The high-side MOSFET turns on at the beginning of the
oscillator cycle and turns off when the COMP voltage
crosses the internal current-mode ramp waveform. The
internal ramp is the sum of the compensation ramp and
the current-mode ramp. The high-side MOSFET also
turns off if the maximum duty cycle exceeds 95%, or
when the current limit is reached. The low-side MOSFET
turns on for the remainder of the switching cycle.
Starting into a Prebiased Output
The IC can soft-start into a prebiased output with-
out discharging the output capacitor. In safe prebi-
ased startup, both low-side and high-side MOSFETs
remain off to avoid discharging the prebiased out-
put. PWM operation starts when the voltage on
SS crosses the voltage on FB.
The IC can start into a prebiased voltage higher than the
nominal set point without abruptly discharging the out-
put. Forced PWM operation starts when the SS voltage
reaches 0.58V, forcing the converter to start. When the
low-side sink current-limit threshold of 14A is reached,
the low-side switch turns off before the end of the clock
period. The low-side sink current limit is 14A. The high-
side switch turns on until one of the following conditions
is satisfied:
? High-side source current hits the reduced high-side
current limit (14A). The high-side switch turns off for
the remaining time of clock period.
? The clock period ends.
Reduced high-side current limit is activated in order to
recirculate the current into the high-side power switch
rather than into the internal high-side body diode, which
can cause damage to the devices. The high-side current
limit is set to 14A.
Low-side sink current limit protects the low-side switch
from excessive reverse current during prebiased
operation.
Enable Input
The IC features independent device enable control and
power-good signal that allow for flexible power sequenc-
ing. Drive the enable input (EN) high to enable the
regulator, or connect EN to IN for always-on operation.
Power-good (PGOOD) is an open-drain output that goes
high when V FB is above the PGOOD threshold, and goes
low if V FB is below the PGOOD threshold.
10
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| MAX1510ETB | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE DDR LINEAR REGULATOR - Bulk |
| MAX1510ETB/V+T | 功能描述:线性稳压器 - 标准 Low-Voltage DDR Linear Regulator RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
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| MAX1510ETB-T | 功能描述:线性稳压器 - 标准 RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
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