L99LD21 datasheet(57/73 Pages) STMICROELECTRONICS

57 / 73 page

DS11130 Rev 5

57/73

L99LD21

Electrical specifications

tTONMAX_OFF

Buck off time after

detection of two

consecutive TON_MAX

operation

µs

tDELAY

Time delay before: to

switch on Buckx (Boost

Disable or No power good);

to switch off Boost (VS

undervoltage)

tLOOP_DELAY_BUCK Buck loop delay

190

tON_MIN_BUCK

Operative Buck converter

minimum on-time

400

tON_MAX_BUCK

Operative Buck converter

maximum on-time

µs

tOFF_MIN_BUCK

Operative Buck converter

minimum off-time

500

tOFF_MAX_BUCK

Operative Buck converter

maximum off-time

µs

ILx_Peak

Inductor Peak Current

Reference Range (see

Table 40 and figures 11 and

12)

Low ILx_PEAK current range;

High RDSON mode

0.179

0.849

High ILx_PEAK current range;

Low RDSON mode

0.362

1.695

VLED_RES

VLED input impedance

425

Ω

ADC_RES

ADC resolution

bits

ADC_CONV_TIME

VLED1 ADC refresh time

Full conversion of 8 bits

VS = 13.5 V

VSPI = 5 V

VLEDx = 10 V

3.6

µs

VLED2 ADC refresh time

ADC_FS

ADC full scale for VLED

measurement

52.5

ADC_INL

ADC Integral Non Linearity

-2

LSB

ADC_DNL

ADC Differential Non

Linearity

-2

LSB

Table 39. Buck converter power stage (continued)

Symbol

Parameter

Test conditions

Min

Typ

Max

Unit

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