0

0.2

0.4

0.6

0.8

1. 0

1. 2

1.4

TIME( 200Ps/DIV)

4.0

4.2

4.4

4.6

4.8

5.0

5.2

5.4

.

Control= 00 :)):00

3

LP55281

SNVS458B – JUNE 2007 – REVISED JUNE 2007

www.ti.com

BOOST OUTPUT VOLTAGE CONTROL

User can control the Boost output voltage by boost output 8-bit register.

Boost Output [7:0] Register 0Fh

Boost Output Voltage (typical)

Bin

Hex

0000 0000

00

4.00

0000 0001

01

4.25

0000 0011

03

4.40

0000 0111

07

4.55

0000 1111

0F

4.70

0001 1111

1F

4.85

0011 1111

3F

5.00 (default)

0111 1111

7F

5.15

1111 1111

FF

5.30

BOOST FREQUENCY CONTROL

Register 'Frequency selections' (address 10h). Register default value after reset is 07h.

FRQ_SEL[2:0]

frequency

1XX

2.00 MHz

01X

1.67 MHz

001

1.00 MHz

Figure 5. Boost Output Voltage Control

10

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