MAX1774(2002) Просмотр технического описания (PDF) - Maxim Integrated

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MAX1774
(Rev.:2002)

Dual, High-Efficiency, Step-Down Converter with Backup Battery Switchover

Maxim Integrated 

Dual, High-Efficiency, Step-Down

Converter with Backup Battery Switchover

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN = +5V, VINC = +3.3V, TA = +25°C, unless otherwise noted.)

CORE SWITCHING WAVEFORMS

(LIGHT LOAD 50mA)

MAX1774-08

3.3V

0

LX

2V/div

CORE SWITCHING WAVEFORMS

(HEAVY LOAD 500mA)

4V MAX1774-09

2V

LXC

0

2V/div

500mA

IL2

0 500mA/div

VCORE

(AC-COUPLED)

20mV/div

20mV

0

VCORE

(AC-COUPLED)

-20mV 20mV/div

500mA L2

0

500mA/div

1µs/div

2µs/div

MAIN LINE-TRANSIENT RESPONSE

MAX1774-10

12V

10V VIN

5V/div

5V

0

50mV VMAIN

(AC-COUPLED)

50mV/div

-50mV

100µs/div

MAIN LOAD-TRANSIENT RESPONSE

MAX1774-12 1000mA

500mA

IMAIN

0

500mA/div

20mV

0

VMAIN

(AC-COUPLED)

-20mV 20mV/div

100µs/div

CORE LINE-TRANSIENT RESPONSE

MAX1774-11

4V

VINC

2V 2V/div

0

VCORE

(AC-COUPLED)

50mV/div

1µs/div

MAIN LOAD-TRANSIENT RESPONSE

50mA TO 500mA

MAX1774-13

500mA IMAIN

0

500mA/div

100µs/div

10mV

0

-10mV

VMAIN

(AC-COUPLED)

10mV/div

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