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| 型号： | MAX15053AEWL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/21页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 9WLP |
| 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： | 2A |
| 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, 2A, Current-Mode
Synchronous, Step-Down Switching Regulator
Detailed Description
The MAX15053 high-efficiency, current-mode switching
regulator can deliver up to 2A of output current. The
MAX15053 provides output voltages from 0.6V 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 MAX15053 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 MAX15053 features a 1MHz fixed switching frequen-
cy, allowing for all-ceramic capacitor designs and fast
transient responses. The high operating frequency mini-
mizes the size of external components. The MAX15053
is available in a 1.5mm x 1.5mm (3 x 3 array) x 0.5mm
pitch WLP package.
The MAX15053 offers a selectable skip-mode functional-
ity to reduce current consumption and achieve a higher
efficiency at light output loads. The low R DS(ON) integrat-
ed switches (30m I high-side and 18m I low-side, typ)
ensure high efficiency at heavy loads while minimizing
critical inductances, making the layout design a much
simpler task with respect to discrete solutions. Utilizing
a simple layout and footprint assures first-pass success
in new designs.
The MAX15053 features 1MHz Q 15%, factory-trimmed,
fixed-frequency PWM mode operation. The MAX15053 also
offers capacitor-programmable, soft-start reducing inrush
current, startup into PREBIAS operation, and a PGOOD
open-drain 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
temperature 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 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 volt-
age crosses the internal current-mode ramp waveform,
which is the sum of the slope compensation ramp and
the current-mode ramp derived from inductor current
(current-sense block). The high-side MOSFET also turns
off if the maximum duty cycle is 94%, or when the current
limit is reached. The low-side MOSFET turns on for the
remainder of the oscillation cycle.
Starting into a Prebiased Output
The MAX15053 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 MAX15053 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
converter to start. In case of prebiased output, below
or above the output nominal set point, if low-side sink
current-limit threshold (set to the reduced value of -0.4A
(typ) for the first 32 clock cycles and then set to -4A typ)
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:
? High-side source current hits the reduced high-side
current limit (0.4A, typ); in this case, the high-side
switch is turned off for the remaining time of the clock
period.
? 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, which could be damaged.
Low-side sink current limit is provided to protect the
low-side switch from excessive reverse current dur-
ing prebiased operation.
In skip mode operation, the prebias output needs to be
lower than the set point.
Enable Input
The MAX15053 features independent device enable
control and power-good signal that allow for flexible
power sequencing. 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 out-
put that asserts when V FB is above 555mV (typ), and
deasserts low if V FB is below 527mV (typ).
Programmable Soft-Start (SS/REFIN)
The MAX15053 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).
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相关代理商/技术参数 |
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|---|---|
| MAX15053EVKIT+ | 功能描述:电源管理IC开发工具 MAX15053 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 |
| MAX15053EWL+ | 制造商:Maxim Integrated Products 功能描述:2A, 1MHZ STEP-DOWN REGULATOR W. INTEGRATED SWITCHES IN 1.5X1 - Rail/Tube |
| MAX15053EWL+T | 功能描述:直流/直流开关调节器 2A Current-Mode Synchronous 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 |
| MAX15054AUT+ | 制造商:Maxim Integrated Products 功能描述:HIGH-SIDE MOSFET DRIVER FOR HB LED DRIVERS AND DC-DC APPLICA - Rail/Tube |
| MAX15054AUT+T | 功能描述:功率驱动器IC High-Side for HB LED Drivers & DC-DC Ap 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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