ADP5360ACBZ-1-R7 datasheet(55/60 Pages) AD

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Data Sheet

ADP5360

Rev. 0 | Page 55 of 60

EXTERNAL COMPONENTS

VBUS Capacitor Selection

According to the USB specification, USB peripherals have a

detectable change in capacitance on VBUS when VBUS is

attached. The peripheral device VBUS bypass capacitance must be

at least 1 μF but not larger than 10 μF. The combined capacitance

for the VBUS pin and the VDD pin must not exceed 10 μF at

any temperature or dc bias condition. Suggested VBUS

capacitors are shown in Table 73.

Table 73. Suggested VBUS Capacitors

Vendor

Product Number

Value (µF) Voltage (V)

Size

Murata

GRM155R61E225ME15D

2.2

0402

Yageo

CC0402MRX5R8BB225

2.2

0402

VDD Capacitor Selection

The internal supply voltage of the ADP5360 is equipped with a

noise suppressing capacitor at VDD. Use typical VDD

capacitance (1 μF). However, do not exceed 10 μF during

operation. Do not connect any external voltage source, any

resistive load, or any other current load to VDD. Suggested

VDD capacitors are shown in Table 74.

Table 74. Suggested VDD Capacitors

Vendor

Product Number

Value (µF)

Voltage (V) Size

Murata

GRM155R60J105KE19D

6.3

0402

Yageo

CC0402KRX5R5BB105

6.3

0402

VSYS Capacitor Selection

To guarantee the performance of the charger in various operation

modes, including trickle charge, constant current charge, and

constant voltage charge, it is imperative that the effects of dc bias,

temperature, and tolerances on the behavior of the capacitors be

evaluated for each application. The total VSYS capacitance

consists of all capacitors when VSYS is tied together with the

input node of the buck and buck boost regulators.

The VSYS capacitance must be ≥10 μF. Suggested VSYS

capacities are shown in Table 75.

Table 75. Suggested VSYS, ISOB, VIN1, VIN2, VOUT1, and

VOUT2 Capacitors

Vendor

Product Number

Value (µF) Voltage (V) Size

Murata

GRM155R60J106ME44D

6.3

0402

Yageo

CC0402MRX5R5BB106

6.3

0402

ISOB Capacitor Selection

The ISOB effective capacitance must be ≥4.7 μF at any point during

operation. Typically, a nominal capacitance of 10 μF is required to

fulfill the condition at all points of operation. Suggestions for an

ISOB capacitor are show in Table 75.

Buck Input Capacitor Selection

An input capacitor is required to reduce the input voltage ripple,

input ripple current, and source impedance. Place the input

capacitor as close as possible to the VIN1 pin. Use the following

equation to determine the rms input current:

(

)

(

)

−

≥

OUT

RMS

LOAD MAX

For most applications, the VIN1 pin ties together with the VSYS

pin. The VSYS capacitance is effective, therefore, a 1 µF capacitor

is sufficient for the VIN1 pin. The input capacitor can be

increased without any limit for better input voltage filtering.

Suggested VIN1 capacitors are show in Table 75.

Buck Inductor Selection

The high switching frequency of the ADP5360 buck converter

allows the selection of small chip inductors when the buck

operates in FPWM mode.

Use the following equation to calculate the peak-to-peak

inductor current ripple (IRIPPLE1):

IRIPPLE1 = VOUT1 × ((VIN1 − VOUT1))/(VIN1 × fSW × L1)

where:

VOUT1 is the buck output voltage.

VIN1 is the buck input voltage at the VIN1 node.

fSW is the buck switching frequency.

L1 is the buck output inductor value.

The minimum dc current rating of the inductor must be greater

than the inductor peak current (IPEAK1). To calculate IPEAK1, use

the following equation:

IPEAK1 = ILOAD1(MAX) + IRIPPLE1

where ILOAD(MAX) is the output current load.

Inductor conduction losses are caused by the flow of current

through the inductor, which has an associated internal dc

resistance (DCR). Larger inductors have smaller DCR values

that can decrease inductor conduction losses. Inductor core

losses are related to the magnetic permeability of the core material.

Because the buck regulators are high switching frequency dc-to-

dc converters, shielded ferrite core material is recommended for

low core losses and low electromagnetic interference (EMI).

Suggested buck inductors are shown in Table 76.

Buck Output Capacitor Selection

Output capacitance is required to minimize the output voltage

overshoot and undershoot and to minimize the output ripple

significantly both in hysteresis mode and FPWM mode.

Capacitors with low equivalent series resistance (ESR) values

produce the lowest output ripple in FPWM mode.

Suggested buck output capacitors are shown in Table 75.

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