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| 型号： | MAX15118EWI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/23页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 18A 28WLP |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5.17 V |
| 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： | 18A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFBGA，WLBGA |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-WLP（3.5x2） |
MAX15118
High-Efficiency, 18A, Current-Mode Synchronous
Step-Down Regulator with Integrated Switches
Detailed Description
The MAX15118 high-efficiency, current-mode switching
regulator delivers up to 18A of output current. The regu-
lator provides output voltages from 0.6V up to 0.94 x V IN
from 2.7V to 5.5V input supplies, making the device ideal
for on-board point-of-load applications.
The MAX15118 delivers current-mode control architec-
ture using a high-gain transconductance error amplifier.
The current-mode control architecture facilitates easy
compensation design and ensures cycle-by-cycle cur-
rent limit with fast response to line and load transients.
The regulator features a 1MHz fixed switching frequency,
allowing for all-ceramic capacitor designs and fast tran-
sient responses. The high operating frequency minimizes
the size of external components.
The regulator offers a selectable skip-mode functionality
to reduce current consumption and achieve a higher
efficiency at light output loads. Integrated switches
ensure high efficiency at heavy loads while minimizing
critical inductances.
The MAX15118 features PWM current-mode control,
allowing for an all-ceramic capacitor solution. The regu-
lator offers capacitor-programmable soft-start to reduce
input inrush current. The device safely starts up into a
prebiased output. The MAX15118 includes an enable
input and open-drain PGOOD output for sequencing with
other devices.
Controller Function—PWM Logic
The controller logic block is the central processor that
determines the duty cycle of the high-side MOSFET
under different line, load, and temperature conditions.
Under normal operation, where the current-limit and tem-
perature protection are not triggered, the controller logic
block takes the output from the PWM comparator and
generates the driver signals for both high-side and low-
side MOSFETs. The controller 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 derived from the inductor current
(current-sense block). The high-side MOSFET also turns
Starting into a Prebiased Output
The MAX15118 can soft-start into a prebiased output
without discharging the output capacitor. In safe pre-
biased startup, both low-side and high-side MOSFETs
remain off to avoid discharging the prebiased output.
PWM operation starts when the voltage on SS/REFIN
crosses the voltage on FB.
The MAX15118 can start into a prebiased voltage higher
than the nominal set point without abruptly discharg-
ing the output. Forced PWM operation starts when the
SS/REFIN voltage reaches 0.58V (typ), forcing the con-
verter to start. The low-side current limit is increased over
350μs to the maximum from the first LX pulse. When the
low-side sink current-limit threshold of 24A is reached,
the low-side switch turns off before the end of the clock
period and the high-side switch turns on until one of the
following conditions is satisfied:
U High-side source current hits the reduced high-side
current limit (24A, typ); in this case, the high-side
switch is turned off for the remaining time of the clock
period.
U The clock period ends.
Reduced high-side current limit is activated to recirculate
the current into the high-side power switch rather than
into the internal high-side body diode
Low-side sink current limit is provided to protect the
low-side switch from excessive reverse current during
prebiased operation.
Enable Input and Power-Good
(PGOOD) Output
The MAX15118 features independent enable control and a
power-good signal that allows for flexible power sequenc-
ing. Drive the enable input (EN) high to enable the regula-
tor, or connect EN to IN for always-on operation.
Power-good (PGOOD) is an open-drain output that
asserts when V FB is above 555mV (typ) and deasserts
low if V FB is below 530mV (typ).
Programmable Soft-Start (SS/REFIN)
The MAX15118 utilizes a soft-start feature to slowly
ramp up the regulated output voltage to reduce input
inrush current during startup. Connect a capacitor from
SS/REFIN to GND to set the startup time (see the Setting
the Soft-Start Time section for capacitor selection details).
off if either the maximum duty cycle (94%, typ) or the cur-
rent limit is reached. The low-side MOSFET turns on for
the remainder of the oscillation cycle.
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