AIC1550 Ver la hoja de datos (PDF) - Analog Intergrations

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AIC1550

Low-Noise Synchronous PWM Step-Down DC/DC Converter

Analog Intergrations 

AIC1550

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

300

VOUT=1.8V

250

200

SYNC/PWM=IN

150

100

SYNC/PWM=GND

50

0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0

Supply Voltage (V)

Fig. 13 DC Supply Current vs. Supply Voltage

100

90 PWM/PFM

80

70

60

PWM

50

40

30

VIN=3.6V

20

VOUT=1.8V

10

0.1

1

10

100

Load current (mA)

Fig. 14 Efficiency vs. Load current

1000

1000

900

800

700

600

500

2250 2000 1750 1500 1250 1000 750

Tuning Resistor RT (kΩ)

500 250

Fig. 15 Operation Frequency vs. Tuning Resistor

Fig. 16 Start-up from Shutdown, RLOAD=3Ω

VOUT=1.8V;

ILOAD=50mA to 500mA;

SYNC/MODE=IN

Fig. 17 Load Transient Response

VOUT=1.8V;

ILOAD=50mA to 500mA;

SYNC/MODE=GND

Fig. 18 Load Transient Response

7

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