RT9278PQV datasheet(9/13 Pages) RICHTEK

Part #	RT9278PQV

Description	High Efficiency Boost LDO Converter & High Power White LED Driver

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Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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9 / 13 page

RT9278

Preliminary

9

DS9278-04 August 2007

www.richtek.com

Typical Operating Characteristics

Reference Voltage vs. Temperature

0.796

0.797

0.798

0.799

0.8

0.801

0.802

0.803

0.804

-40 -20

0

20

40

60

80 100 120 140 160 180

Temperature (

°C)

VDD = 3.3V

Efficiency vs. Output Current

0

10

20

30

40

50

60

70

80

90

100

1

10

100

1000

Output Current (mA)

VIN = 4.5V

VIN = 4.0V

VIN = 3.5V

VIN = 3.0V

VIN = 2.5V

VIN = 2.0V

VIN = 1.5V

VOUT = 5.0V

Efficiency vs. Output Current

0

10

20

30

40

50

60

70

80

90

100

1

10

100

1000

Output Current (mA)

VIN = 3.0V

VIN = 2.5V

VIN = 2.0V

VIN = 1.5V

VOUT = 3.3V

Frequency vs. Temperature

580

600

620

640

660

680

700

-40 -20

0

20

40

60

80 100 120 140 160 180

Temperature (

°C)

VDD = 3.3V

Input Voltage vs. Output Voltage

4.850

4.900

4.950

5.000

5.050

5.100

5.150

1.6

1.925

2.25 2.575

2.9

3.225 3.55 3.875

4.2

Input Voltage (V)

VOUT = 5.0V

1.93

2.58

3.23

3.88

Input Voltage vs. Output Voltage

3.200

3.225

3.250

3.275

3.300

3.325

3.350

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

Input Voltage (V)

VOUT = 3.3V

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