L7292 datasheet(18/60 Pages) STMICROELECTRONICS

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Voltage regulators

L7292

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DocID028601 Rev 1

6.4

BUCK4 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 13. BUCK4 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

0.7

1.3

Output voltage step size

Single step change

Load current range

Internal FET, steady state

1.0

Current limit threshold

Integrated FET current

3.0(1)

PFM current peak

Programmable

0.8

DC line regulation

3.3 V < VSUP < 5 V Iout = 1 A

0.4(1)

%/V

DC load regulation

While in PWM PSR4CFG 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 µs.

Referring to CCM, Vout = 1.1 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 = 1.1 V, Rload = 1.5



360(1)

µs

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 = 1.1 V, Iload = 1 mA

82(2)

Vin = 3.3 V, Vout = 1.1 V, Iload = 1 mA

83(2)

Vin = 5.0 V, Vout = 1.1 V, Iload = 1 A

81(2)

Vin = 3.3 V, Vout = 1.1 V, Iload = 1 A

82(2)

FB input impedance

0.2



Input capacitor

4.7

µF

Output filter capacitor

µF

Output filter capacitor ESR



Output filter inductance

1.0

µH

1. Guarantee by design.

2. Efficiency measured between the SUP14 PIN and BUCK4 POUT and while the BUCK1 is off. L= 1 µH, DC resistance max =

0.036

.

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