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| 型号： | MAX15109EWP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/19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
= f P3
= f Z2
=
C CC =
C OUT × ESR
C CC =
If the ESR output zero is located at less than one-half
the switching frequency, use the (optional) secondary
compensation capacitor, C CC , to cancel it, as follows:
1 1
2 π × C CC R C 2 π × C OUT ESR
therefore:
R C
If the ESR zero exceeds 1/2 the switching frequency,
use the following equation:
therefore:
2
2 π × f SW × R C
Overall C CC detracts from the overall system phase
margin. Place this third pole well beyond the desired
crossover frequency to minimize the interaction with the
system loop response at crossover. Ignore C CC in these
calculations if C CC is smaller than 10pF.
Power Dissipation
The IC is available in a 20-bump WLP package and
can dissipate up to 1.27W at +70 N C board temperature.
When the die temperature exceeds +155 N C, the ther-
1 f SW
GAIN
f P3
=
=
2 π × C CC R C 2
1ST ASYMPTOTE
V FB x V OUT -1 x 10 A VEA [dB]/20 x G MOD x R LOAD
mal-shutdown protection is activated. See the Thermal
Shutdown Protection section.
2ND ASYMPTOTE
V FB x V OUT -1 x g MV x (C C ) -1 x G MOD x R LOAD
3RD ASYMPTOTE
V FB x V OUT -1 x g MV x (C C ) -1 x G MOD x R LOAD x (C OUT (ESR + R LOAD )) -1
4TH ASYMPTOTE
V FB x V OUT -1 x g MV x R C x G MOD x R LOAD x (C OUT (ESR + R LOAD )) -1
3RD POLE
(C CC R C ) -1
2ND ZERO
(C OUT ESR) -1
UNITY
1ST POLE
g MV x (10 A VEA [dB]/20 C C ) -1
1ST ZERO
(C C R C ) -1
CO
RAD/S
2ND POLE
(C OUT (ESR + R LOAD )) -1
5TH ASYMPTOTE
V FB x V OUT -1 x g MV x R C x G MOD x (ESR || R LOAD )
6TH ASYMPTOTE
V FB x V OUT -1 x g MV x (C CC ) -1 x G MOD x (ESR || R LOAD )
Figure 4. Asymptotic Loop Response of Peak Current-Mode Regulator
16
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