L7292 datasheet(15/60 Pages) STMICROELECTRONICS

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L7292

Voltage regulators

6.1

BUCK1 switching regulator

Unless otherwise noted, typical values at TA = 25 °C, Vin = 5.0 V.

The max. values are at Tj = 125 °C and the worst case process.

Table 10. BUCK1 switching regulator

Parameter

Conditions

Min.

Typ.

Max.

Unit

DC bias current

No load , PFM mode

µA

Output DC voltage range

Steady state, ILOAD < 1 A

0.9

1.6

Output voltage step size

Single step change

Load current

Internal FET, steady state

Current limit threshold

Integrated FET current

2.5(1)

PFM current peak

Programmable peak current

0.8

DC line regulation

3.3 V < VSUP < 5 V, Iout = 1 A

0.4(1)

%/V

DC load regulation

While in PWM

PSR1CFG bit 7 = 1

0.2(1)

%/A

Switching frequency

Programmable

1.3

MHz

Output voltage accuracy

While In PWM

-2

Transient response

Load transient time = 10

s. Referring to CCM,

Vout = 1.2 V, load current from 0 to 80% Imax.

±3(1)

Soft-start time

Vin = 3.3 V, output voltage ramp from 0 to 95%

of final Vout = 1.2 V, R load =1.4



250(1)

360(1)

s

Integrated high-side PFET

RDS

Vin =5 V

109



Vin = 3.3 V

132

Integrated low-side NFET

RDS

Vin = 5 V

Vin = 3.3 V

Efficiency

Vin = 5.0 V, Vout = 1.2 V, Iload = 1 mA

82(2)

Vin =3.3 V, Vout = 1.2 V, Iload = 1 mA

84(2)

Vin = 5.0 V, Vout = 1.2 V, Iload = 1 A

81(2)

Vin = 3.3 V, Vout = 1.2 V, Iload = 1 A

82(2)

FB input impedance

0.2



Input capacitor

4.7

F

Output filter capacitor

F

Output filter capacitor ESR



Output filter inductance

1.0

H

1. Guaranteed by design.

2. Efficiency measured between the SUP14 PIN and BUCK1 POUT and while the BUCK4 is off. L = 1

H, DC resistance

max. = 0.036

.

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