LP5526

SNVS431D – FEBRUARY 2006 – REVISED MARCH 2013

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MAGNETIC BOOST DC/DC CONVERTER ELECTRICAL CHARACTERISTICS

Parameter

Test Conditions

Min

Typ

Max

Unit

Maximum non-continuous load

3.0V

140

mA

150

Maximum continuous load current

100

Output voltage accuracy

3.0V

−2.3

+2.3

%

(FB pin)

-1.7

+1.7

Switch ON resistance

0.15

0.3

Ω

PWM mode switching frequency

RT = 82 k

Ω

1.0

MHz

Frequency accuracy

RT = 82 k

Ω

−7

+7

%

−9

+9

Switch pulse minimum width

no load

45

ns

Startup time

15

ms

no load

SW pin current limit

1500

1850

mA

(1)

Maximum non-continuous currents rates as short pulses (t < 1s). Exposure to maximum rating conditions for extended periods may

affect device reliability.

BOOST STANDBY MODE

User can set the Boost Converter to STANDBY mode by writing the register bit EN_BOOST low. When

EN_BOOST is written high, the converter starts for 20ms in low current PWM mode and then goes to normal

PWM mode. All LED outputs are off during the 20ms delay to ensure smooth startup.

BOOST OUTPUT VOLTAGE CONTROL

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

Boost Output [7:0]

Boost Output

Register 0DH

Voltage (typical)

Bin

Dec

0000 1000

8.0V

0000 1001

9

9.0V

0000 1010

10

10.0V

0000 1011

11

11.0V

0000 1100

12

12.0V

0000 1101

13

13.0V

0000 1110

14

14.0V

0000 1111

15

15.0V

0001 0000

16

16.0V

0001 0001

17

17.0V

0001 0010

18

18.0V

0001 0011

19

19.0V

0001 0100

20.0V

(1)

If register value is lower than 8, then value of 8 is used internally.

(2)

If register value is higher than 20, then value of 20 is used internally.

10

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