AIC1553 查看數據表（PDF） - Analog Intergrations

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AIC1553

Compact 500KHz PWM/PFM, Step-Down DC/DC Converters

Analog Intergrations 

AIC1553

TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

Fig. 11 Start-up ILOAD=400mA

VIN=3.3V, VOUT=2.5V

BLOCK DIAGRAM

GND

VIN

0.75V

REF

Phase

Compensation

FB

Error

FB

-

AMP.

REF

+

Fig. 12 Load Transient Response

ILOAD=20mA to 400mA

VIN=3.3V, VOUT=2.5V

Current Limit

Comparator

+

-

Current AMP.

+

X5

-

VIN

VIN

5Ω

Slope

Compensation

PWM

Comparator

-

+

500KHz

Oscillator

Control

Logic

x20

x1

LX

Driver

Shutdown

SHDN

PWM/PFM

Control

-

REF

+

PFM

Comparator

6

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