MAX1775 查看數據表（PDF） - Maxim Integrated

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MAX1775

Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers

Maxim Integrated 

Dual-Output Step-Down

DC-DC Converter for PDA/Palmtop Computers

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VMAIN = +3.3V, VCORE = +1.8V, TA = +25°C, unless otherwise noted.)

0

-0.2

-0.4

-0.6

-0.8

-1.0

-1.2

-1.4

-1.6

-1.8

-2.0

0

REFERENCE LOAD REGULATION

10 20 30 40 50 60 70 80

IREF (µA)

MAIN SWITCHING WAVEFORMS,

HEAVY LOAD (1A)

MAX1775 toc06

LX

5V/div

MAIN SWITCHING WAVEFORMS,

LIGHT LOAD (100mA)

MAX1775 toc05

LX

5V/div

1µs/div

ILM

500mA/div

VMAIN

(AC-COUPLED)

20mV/div

CORE SWITCHING WAVEFORMS,

LIGHT LOAD (50mA)

MAX1775 toc07

LX

5V/div

1µs/div

1000mA ILM

500mA 500mA/div

0

VMAIN

(AC-COUPLED)

20mV/div

1µs/div

200mA ILC

0

200mA/div

VCORE

(AC-COUPLED)

20mV/div

CORE SWITCHING WAVEFORMS,

HEAVY LOAD (500mA)

4V MAX1775 toc08

LXC

2V/div

0

VCORE

(AC-COUPLED)

20mV/div

MAIN LINE-TRANSIENT RESPONSE

(5V TO 12V)

MAX1775 toc09

12V

VIN

5V

0

2µs/div

500mA

ILC

250mA/div

0

100µs/div

VMAIN

50mV/div

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