L99LD21 datasheet(56/73 Pages) STMICROELECTRONICS

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Electrical specifications

L99LD21

56/73

DS11130 Rev 5

6.4.3

Buck

Table 39. Buck converter power stage

Symbol

Parameter

Test conditions

Min

Typ

Max

Unit

VBUCKIN1

VBUCKIN2

Buck input voltage range

ILx_PEAK

Accuracy of the inductor

peak current

Low RDSon Mode;

Tj ≥ 25 °C

-4.5

4.5

Low RDSon Mode;

Tj < 25 °C

DAC code

≥ 26

-6

High RDSon Mode;

Tj ≥ 25 °C

DAC code

≥ 26

-4.5

4.5

High Rdson Mode;

Tj ≥ 25 °C

DAC code < 26

-6

High Rdson Mode;

Tj ˂ 25 °C

DAC code

≥ 26

VLED_SHT

Buck short circuit activation

threshold

Ramp on VLEDx from 52.5 V

to 0 V

1.2

1.7

2.2

RDSON

Buck MOSFET RDSON

High RDS_ON mode;

VBUCKINx = 45 V;

IOUT = 350 mA; Tj = 25 °C

800

Ω

Low RDS_ON mode;

VBUCKINx = 45 V;

IOUT = 700 mA; Tj = 25 °C

400

Ω

RDSON

Buck MOSFET RDSON

High RDS_ON mode;

VBUCKINx = 45 V;

IOUT = 350 mA; Tj = 150 °C

1300

Ω

Low RDS_ON mode;

VBUCKINx = 40 V;

IOUT = 700 mA; Tj = 150 °C

650

Ω

(dVLX/dt)ON

LX Turn on voltage slope

2.4

V/ns

(dVLX/dt)OFF

LX Turn off voltage slope

2.4

V/ns

tBlank_Buck

Buck Blanking Time

200

tSTARTUP

Buck startup phase

duration

400

µs

N_ton_min_fail

Number of failure counter

cycle

N_ton_min_fail_reset

Reset of number of failure

counter cycle

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