L9758 datasheet(13/29 Pages) STMICROELECTRONICS

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L9758

Electrical characteristics

Doc ID 14273 Rev 3

13/29

4.2

BUCK pre-regulator

Tamb = -40 °C to 125 °C, VBAT = VBAT_SW = 5.5 to 26.5 V; unless otherwise specified.

Table 8.

BUCK pre-regulator

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

FSW

Operating frequency

Rext = 10.0 kOhm ±1%

VBAT_SW = 13.5 V

300

450

kHz

RdsON

High side switch ON

resistance

VBAT_SW = 6.0V

0.25

IST_MAX

Average current during

start-up

VB = 3.0V

0.3

0.7

VBREG

Output voltage

7.0V < VBAT_SW < 18V

0.25A < IVBAT <2.0A

5.5

6.1

Vb100

100% Duty Cycle operation

threshold

Voltage sensed at VBAT_SW pin

6.2

7.8

Vb100h

100% Duty Cycle operation

threshold hysteresis

0.05

0.8

ΔVpre

Load regulation

ΔI

VB = 0.1A –2A VBAT_SW = 13.5V

400

Vrpre

Voltage ripple, p-p

L = 22µH, C = 22µF X7R

VBAT_SW = 13.5V

300

Start time

L = 22µH, C = 22µF X7R

1.4

DCmin

Minimum duty cycle

EFF

Efficiency

VBAT_SW = 13.5 V IVB = 0.5A

VBAT_SW = 13.5V IVB = 2A

Output Inductance

µH

ESR

Output capacitance

100

160

µF

Power-up overvoltage

VBAT_SW < 26.5V

0.25A < IVBAT <2.0A

200

Tr_sw

Tf_sw

SW rising and falling time

7.0V < VBAT_SW < 18V

IVBAT <2.0A (20%, 80%)

150

µs

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