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RT9287

Boost Converter for OLED Power with Dual LDO

Richtek Technology 

RT9287

Preliminary

Typical Operating Characteristics

Boost Efficiency vs. Input Voltage

88

86

VOUT = 12V

Boost Efficiency vs. Load Current

86

84

84

82

82

VOUT = 15V

80

80

78

78

ILOAD = 20mA

76

3

3.2 3.4 3.6 3.8

4

Input Voltage (V)

4.2 4.4

76

VIN = 3.7V, VOUT = 15V

74

5

10

15 20 25 30

35 40

Load Current (mA)

Boost Feedback Voltage vs. Input Voltage

1.2400

1.2395

1.2390

1.2385

1.2380

VOUT = 15V, ILOAD = 20mA

1.2375

3

3.2 3.4 3.6 3.8

4

Input Voltage (V)

4.2 4.4

Boost Feedback Voltage vs. Load Current

1.243

1.242

1.241

1.240

1.239

1.238

1.237

VIN = 3.7V, VOUT = 15V

1.236

0

10

20

30

40

50

Load Current (mA)

Boost Feedback Voltage vs.Temperature

1.2390

1.2385

1.2380

VIN

(100mV/Div)

VOUT

(100mV/Div)

Boost Normal Operation

1.2375

1.2370

ILX

(200mA/Div)

1.2365

1.2360

VIN = 3.7V, ILOAD = 20mA

1.2355

-40 -30 -20 -10 0 10 20 30 40 50 60 70 80

Temperature (°C)

VLX

(10V/Div)

VIN = 3V, VOUT = 15V, ILOAD = 20mA

Time (500ns/Div)

www.richtek.com

6

DS9287-01 August 2007

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