LP8720

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SNVS575B – JULY 2008 – REVISED MAY 2013

Table 4. Register 0x00

EXT_DVS_CONTROL

1 – DVS pin control:

•

DVS = HI then BUCK_V1[4:0]

•

DVS = LO then BUCK_V2[4:0]

0 – Serial interface control:

•

DVS_V2/V1 = 1 then BUCK_V1[4:0]

•

DVS_V2/V1 = 0 then BUCK_V2[4:0]

EXT_SLEEP_CONTROL

1 – DVS-pin control:

•

DVS = HI then normal

•

DVS = LO then SLEEP

0 – Serial interface control:

•

SLEEP_MODE = 0 then normal

•

SLEEP_MODE = 1 then SLEEP

SHORT_TIMESTEP

1 – time step tS = 25 µs

0 – time step tS= 50 µs

By request time step 100 µs/200 µs is available.

Table 5. Registers 0x01 – 0x07

LDO1_V[4:0]

00000 – 1.20V

01000 – 1.60V

10000 – 2.10V

11000 – 2.75V

LDO2_V[4:0]

00001 – 1.25V

01001 – 1.65V

10001 – 2.20V

11001 – 2.80V

LDO3_V[4:0]

00010 – 1.30V

01010 – 1.70V

10010 – 2.30V

11010 – 2.85V

LDO5_V[4:0]

00011 – 1.35V

01011 – 1.75V

10011 – 2.40V

11011 – 2.90V

00100 – 1.40V

01100 – 1.80V

10100 – 2.50V

11100 – 2.95V

00101 – 1.45V

01101 – 1.85V

10101 – 2.60V

11101 – 3.00V

00110 – 1.50V

01110 – 1.90V

10110 – 2.65V

11110 – 3.10V

00111 – 1.55V

01111 – 2.00V

10111 – 2.70V

11111 – 3.30V

LDO4_V[4:0]

00000 – 0.80V

01000 – 1.35V

10000 – 1.75V

11000 – 2.40V

00001 – 0.85V

01001 – 1.40V

10001 – 1.80V

11001 – 2.50V

00010 – 0.90V

01010 – 1.45V

10010 – 1.85V

11010 – 2.60V

00011 – 1.00V

01011 – 1.50V

10011 – 1.90V

11011 – 2.65V

00100 – 1.10V

01100 – 1.55V

10100 – 2.00V

11100 – 2.70V

00101 – 1.20V

01101 – 1.60V

10101 – 2.10V

11101 – 2.75V

00110 – 1.25V

01110 – 1.65V

10110 – 2.20V

11110 – 2.80V

00111 – 1.30V

01111 – 1.70V

10111 – 2.30V

11111 – 2.85V

BUCK_V1[4:0] BUCK_V2[4:0]

0000

01000 – 1.15V

10000 – 1.55V

11000 – 1.95V

External resistor divider

01001 – 1.20V

10001 – 1.60V

11001 – 2.00V

00001 – 0.80V

01010 – 1.25V

10010 – 1.65V

11010 – 2.05V

00010 – 0.85V

01011 – 1.30V

10011 – 1.70V

11011 – 2.10V

00011 – 0.90V

01100 – 1.35V

10100 – 1.75V

11100 – 2.15V

00100 – 0.95V

01101 – 1.40V

10101 – 1.80V

11101 – 2.20V

00101 – 1.00V

01110 – 1.45V

10110 – 1.85V

11110 – 2.25V

00110 – 1.05V

01111 – 1.50V

10111 – 1.90V

11111 – 2.30V

00111 – 1.10V

BUCK_V1[4:0] should be higher (or equal) than BUCK_V2[4:0].

LDO1_T[2:0]

000 – startup delay 0

100 – startup delay = 4 * time step tS

LDO2_T[2:0]

001 – startup delay = 1 * time step tS

101 – startup delay = 5 * time step tS

LDO3_T[2:0]

010 – startup delay = 2 * time step tS

110 – startup delay = 6 * time step tS

LDO4_T[2:0]

011 – startup delay = 3 * time step tS

111 – NO startup

LDO5_T[2:0]

For proper startup operation “111 NO startup” should have corresponding bit in ENABLE_BITS register

BUCK_T[2:0]

0x08 set to 0 (disable).

FORCE_PWM

1 – Buck is forced to work in PWM mode

0 – Buck works in automatic PFM/PWM selection mode.

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