PCA9420 datasheet(71/87 Pages) NXP

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NXP Semiconductors

PCA9420

Power management IC for low-power microcontroller applications

13.4 BUCK2 (SW2)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIN(SW2)

Input voltage

range for SW2

Input is VPSYS2

2.5

5.5

IOUT(SW2)MAX

Maximum Output

Current

Over VPSYS2

500

1.5

2.1

VSW2_RANGE

Output range for

SW2

I2C programmable, 25 mV/step

2.7

3.3

Over full VPSYS2, IOUT(SW2),

Tamb=room temp

-2

VSW2_Accuracy

SW2 DC Output

Accuracy

Over full VPSYS2, IOUT(SW2),

temperature range

-3

ΔVSW2 / Δ VPSYS2

DC Line

regulation

VSW2OUT(NOM)+0.5 V < VPSYS2 <

5.5 V, IOUT(SW1) = 500 mA

0.15

%/V

ΔVSW2 / ΔIOUT(SW2) DC Load

regulation

0 mA < IOUT(SW1) < 500 mA

0.008

%/mA

TON (SW2)

250

360

490

IIN(SW2)[1]

Quiescent current SW2 enabled, IOUT(SW2) = 0, no

switching

700

Inductor value

2.2

µH

High Side P-FET

RDSON

VPSYS2 = 5 V

250

450

RDSON(SW2)[1]

Low Side N-FET

RDSON

VPSYS2 = 5 V

125

250

mΩ

RSTDN(SW2)

SW2 Output

Active Discharge

Resistance

ILIM(SW2)

Peak Current

Limit

Cycle by cycle peak current limit

900

1300

1800

tONMIN(SW2)

Min. On Time

tOFFMIN(SW2)

Max On Time

tSSTART(SW2)

Softstart time

VSW2OUT=1.8 V

1.8

@IOUT=10 µA

> 78

@IOUT=100 µA

> 87

@IOUT=125 mA

> 88

@IOUT=250 mA

> 88

Efficiency[1]

VPSYS25 V

VSW2OUT = 1.8 V

@IOUT=500 mA

> 86

Table 83. EC table for BUCK2 (SW2)

[1]

Guaranteed by design and characterization; not tested in production.

PCA9420

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 4.0 — 28 November 2022

71 / 87

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