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| 型号： | MAX8952EWE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/31页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2.5A 16WLP |
| 产品培训模块： | Lead (SnPb) Finish for COTS 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： | 0.77 V ~ 1.4 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 频率 - 开关： | 3.25MHz |
| 电流 - 输出： | 2.5A |
| 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： | 16-UFBGA，WLCSP |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-WLP（2x2） |
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MAX8952
2.5A Step-Down Regulator
with Remote Sense in 2mm x 2mm WLP
ly biased and the number of consecutive zero-crossing
cycles exceeds 24, the DC-DC step-down converter
begins hysteretic operation.
During hysteretic operation, there is a silent DC offset
due to the use of valley regulation. See Figure 4.
When operating in power-save mode and the load cur-
switching frequency depending on the load condition.
With moderate to heavy loading, the regulator switches
at a fixed switching frequency as it does in forced-PWM
mode. In power-save mode, the transition from hys-
teretic mode to fixed-frequency switching occurs at the
load current specified in the following equation:
I OUT = IN OUT ×
rent is increased so that the number of consecutive
zero-crossing cycles is less than 16, the PWM mode is
biased. Once fully biased and the number of zero-
crossing cycles drops below 8, the DC-DC converter
V ? V
2 × L
V OUT
V IN × f OSC
then begins PWM operation. Since there is a delay
between the increase in load current and the
DC-DC converter starting PWM, the converter supports
full current on the output during hysteretic operation.
See Figure 5 for a detailed state diagram.
Power-save operation offers improved efficiency at light
loads by changing to hysteretic mode, reducing the
In forced-PWM mode, the regulator operates with a
constant (3.25MHz or synchronized to external clock
source) switching frequency regardless of output load.
Forced-PWM mode is ideal for low-noise systems
because switching harmonics occur at multiples of the
constant switching frequency and are easily filtered.
However, light-load power consumption in forced-PWM
mode is higher than that of power-save mode.
REGULATION
THRESHOLD
Figure 4. Output Regulation in Hysteretic Operation
OUTPUT
RIPPLE
Soft-Start
The IC includes internal soft-start circuitry that eliminates
inrush current at startup, reducing transients on the
input source (see the Typical Operating Charac-
MORE THAN 16 CONSECUTIVE
ZERO-CROSSING CYCLES
LESS THAN 8 CONSECUTIVE
ZERO-CROSSING CYCLES
AND PWM MODE READY
PWM
MODE
LESS THAN 8 CONSECUTIVE
ZERO-CROSSING CYCLES
MORE THAN 24 CONSECUTIVE
ZERO-CROSSING CYCLES
PWM MODE
WITH POWER-SAVE
MODE BIASED
POWER SAVE NOT READY
MORE THAN 24 CONSECUTIVE
ZERO-CROSSING CYCLES
AND POWER-SAVE MODE READY
PWM NOT READY
POWER-SAVE
MODE WITH
PWM BIASED
POWER-SAVE
MODE
LESS THAN 16 CONSECUTIVE
ZERO-CROSSING CYCLES
Figure 5. Mode Change for DC-DC Step-Down Converter
14
Maxim Integrated
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