MAX887 데이터 시트보기 (PDF) - Maxim Integrated

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MAX887

100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC Converter

Maxim Integrated 

100% Duty Cycle, Low-Noise,

Step-Down, PWM DC-DC Converter

_____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)

LOAD-TRANSIENT RESPONSE

LINE-TRANSIENT RESPONSE

A

B

C

40µs/div

VIN = 5V, VOUT = 3.3V,

LOAD = 0mA TO 500mA, PWM MODE

A: LX, 5V/div

B: VOUT, 50mV/div, AC COUPLED

C: LOAD CURRENT, 500mA/div

A

B

200µs/div

VIN = 5V TO 11V, VOUT = 3.3V,

LOAD = 500mA, PWM MODE

A: VIN, 5V/div

B: VOUT, 20mV/div, AC COUPLED

RECOVERY FROM 100% DUTY CYCLE

(DROP OUT)

A

B

C

200µs/div

VIN = 3.3V TO 11V, VOUT = 3.3V,

LOAD = 500mA, PWM MODE

A: VIN, 5V/div

B: VOUT, 50mV/div, AC COUPLED

C: LX, 10V/div

SHUTDOWN AND STARTUP RESPONSE

A

B

C

D

500µs/div

VIN = 5V, VOUT = 3.3V,

LOAD = 100mA, PWM MODE

A: SHDN, 5V/div

B: VOUT, 2V/div, AC COUPLED

C: LX, 5V/div

D: INDUCTOR CURRENT, 500mA/div

6 _______________________________________________________________________________________

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