PCA9420 datasheet(69/87 Pages) NXP

69 / 87 page

NXP Semiconductors

PCA9420

Power management IC for low-power microcontroller applications

13.3 BUCK1 (SW1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIN(SW1)

Input voltage

range for CORE

BUCK

Input is PSYS1, guaranteed by design 2.5

5.5

IOUT(SW1) MAX

Max Output

Current

Over VPSYS1, guaranteed by design

250

VSW1 Range

Output range for

CORE BUCK

I2C programmable from 0.5 V to 1.5 V

in 25 mV/step, a fixed 1.8 V

0.5

1.5

Over full VPSYS1, IOUT(SW1),

-40 °C ≤ Tamb ≤ +85 °C, for all

VSW1_OUT except for 500 mV and

1.8 V

-3

Over full VPSYS1, IOUT(SW1),

-40 °C ≤ Tamb ≤ +85 °C, for only

VSW1_OUT =1.8 V

-3.5

+3.5

VSW1_OUT Accuracy CORE BUCK DC

Output Accuracy

Over full VPSYS1, IOUT(SW1),

-40 °C ≤ Tamb ≤ +85 °C, for only

VSW1_OUT =0.5 V

-4

ΔVSW1 / Δ VPSYS1

DC Line

regulation

VSW1(NOM)+0.5 V < VPSYS1 < 5.5 V,

IOUT(SW1) = 250 mA

0.15

%/V

ΔVSW1 / ΔIOUT(SW1) DC Load

regulation

0 mA < IOUT(SW1) < 250 mA

0.008

%/mA

TON (SW1)

-40 °C ≤ Tamb ≤ +85 °C [1]

110

240

350

IIN(SW1)[1]

Quiescent current SW1 enabled, IOUT(SW1) = 0, no

switching

700

Inductor value

2.2

µH

High Side P-FET

RDSON

VPSYS1=5 V

500

900

RDSON(SW1)[1]

Low Side N-FET

RDSON

VPSYS1=5 V

250

450

mΩ

RSTDN(SW1)

SW1 Output

Active Discharge

Resistance

ILIM(SW1)

Internal Peak

Current Limit

Cycle by cycle peak current limit

700

950

1200

tONMIN(SW1)

Minimum On-

Time

tOFFMIN(SW1)

Minimum-Off

Time

tSSTART(SW1)

Soft-start time

VSW1OUT=1.2 V

1.2

@IOUT=10 µA

> 76

@IOUT=100 µA

> 84

Efficiency[1]

VPSYS1=5 V,

VSW1OUT=1.5 V

@IOUT=65 mA

> 86

Table 82. EC table for BUCK1 (SW1)

PCA9420

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

Product data sheet

Rev. 4.0 — 28 November 2022

69 / 87

PCA9420 Datasheet(PDF) 69 Page - NXP Semiconductors

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