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参数资料
| 型号： | MAX15118EWI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/23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
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 1.2mS (typ). COMP clamp low is set to 0.97V
(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 MAX15118 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 150A/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 MAX15118 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 MAX15118 features selectable skip mode operation
when SKIP is connected to EN. When in skip mode, the
LX output becomes high impedance when the induc-
tor 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 cur-
rent limit threshold (3.6A, 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 MAX15118 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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