Application NoteNxp

AN14685: PF9453 QFN Schematic and Layout Guidelines

Design guidelines for the PF9453 PMIC, featuring schematics for i.MX 91/93 processors, pin configurations, and component selection for BUCK converters and LDOs.

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Overview

This application note provides detailed schematic and PCB layout design guidelines for the NXP PF9453 Power Management IC (PMIC). The document covers the 40-pin HVQFN package variant (MPF9453AXMXXHN) and includes a reference schematic for the i.MX 91 processor family. It provides comprehensive pin connection tables, requirements for BUCK converter inductor selection, and mathematical formulas for calculating inductor ripple current and saturation current. The guide also specifies passive component recommendations, such as low-DCR inductors and ceramic bypass capacitors, to ensure optimal performance in industrial and IoT applications.

Use Cases

Power management for i.MX 91 and i.MX 93 processor families
Industrial IoT platform power supply design
Consumer electronics power sequencing
High-efficiency BUCK converter implementation

Topics

PF9453

PMIC

NXP

i.MX 91

i.MX 93

HVQFN40

Power Management

Buck Converter

LDO

Schematic Design

PCB Layout

Referenced Parts

DFE252010P-R47M=P2

Murata

BUCK1, BUCK2, Murata DFE252010P-R47M=P2 0.47 2.50 mm x 2.00 mm 35 5.0 3.5

ABS07-32.768KHZ-T

Abracon

Y1 XTAL XTAL_IN and XTAL_OUT ABS07-32.768KHZ-T 3.2 mm x 1.5 mm 32.768 kHz

DFE21CCNR47MELL

Murata

BUCK3, BUCK4. Murata DFE21CCNR47MELL 0.47 2.00 mm x 1.2 mm 29 4.8 4.1

MPF9453AXMXXHN

NXP

While applicable to all PF9453 QFN variants (MPF9453AXMXXHN), the term PF9453HN is used throughout for simplicity.

GCM1555C1H180JA16

Murata

C18 XTAL XTAL_IN GCM1555C1H180JA16 1005 18 pF

GRM155R60J475ME

Murata

C13, C14 LDO1 input INL1 GRM155R60J475ME 1005 4.7 μF x 2

GRM155R61C105KA

Murata

C10 VINT VINT GRM155R61C105KA 1005 1 μF

GRM155R61C225KE

Murata

C12 LDO_SNVS output LDO_SNVS GRM155R61C225KE 1005 2.2 μF

GRM158C80G226ME

Murata

C2 BUCK BUCK1 Output GRM158C80G226ME 6.0mΩ 1005 22 μF

GRM188R60J106ME

Murata

C1, C3 BUCK1 and BUCK2 INB12 GRM188R60J106ME 1608 10 μF x 2

DFE21CCNR47MELL

Murata

BUCK4. Murata DFE21CCNR47MELL 0.47 2.00 mm x

BUCK4.

Murata

BUCK4. Murata DFE21CCNR47MELL 0.47 2.00 mm x

DFE252010P-R47M=P2	Murata	BUCK1, BUCK2, Murata DFE252010P-R47M=P2 0.47 2.50 mm x 2.00 mm 35 5.0 3.5
ABS07-32.768KHZ-T	Abracon	Y1 XTAL XTAL_IN and XTAL_OUT ABS07-32.768KHZ-T 3.2 mm x 1.5 mm 32.768 kHz
DFE21CCNR47MELL	Murata	BUCK3, BUCK4. Murata DFE21CCNR47MELL 0.47 2.00 mm x 1.2 mm 29 4.8 4.1
MPF9453AXMXXHN	NXP	While applicable to all PF9453 QFN variants (MPF9453AXMXXHN), the term PF9453HN is used throughout for simplicity.
GCM1555C1H180JA16	Murata	C18 XTAL XTAL_IN GCM1555C1H180JA16 1005 18 pF
GRM155R60J475ME	Murata	C13, C14 LDO1 input INL1 GRM155R60J475ME 1005 4.7 μF x 2
GRM155R61C105KA	Murata	C10 VINT VINT GRM155R61C105KA 1005 1 μF
GRM155R61C225KE	Murata	C12 LDO_SNVS output LDO_SNVS GRM155R61C225KE 1005 2.2 μF
GRM158C80G226ME	Murata	C2 BUCK BUCK1 Output GRM158C80G226ME 6.0mΩ 1005 22 μF
GRM188R60J106ME	Murata	C1, C3 BUCK1 and BUCK2 INB12 GRM188R60J106ME 1608 10 μF x 2
DFE21CCNR47MELL	Murata	BUCK4. Murata DFE21CCNR47MELL 0.47 2.00 mm x
BUCK4.	Murata	BUCK4. Murata DFE21CCNR47MELL 0.47 2.00 mm x