ADP5350ACBZ-1-R7 datasheet(59/63 Pages) AD

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Data Sheet

ADP5350

Rev. B | Page 59 of 63

CFL2 Capacitor Selection

The CFL2 pin is the internal regulator output that provides the

power supply for post stage control circuits, including the fuel

gauge, boost LED, and LDOs. To ensure stable performance of

the internal regulator, the recommended components for the

CFL2 capacitor are given in Table 85.

ISOS and ISOB Capacitor Selection

Higher output capacitor values reduce the output voltage ripple

and improve load transient response. When choosing this value,

it is also important to account for the loss of capacitance due to

output voltage dc bias.

To guarantee the performance of the charger in various operation

modes, including trickle charge, CC charge, and CV 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 peak-to-peak output voltage ripple for the selected output

capacitor and inductor values is calculated using the following

equation:

OUT

RIPPLE

Capacitors with lower effective series resistance (ESR) are

preferable to guarantee low output voltage ripple, as shown in

the following equation:

RIPPLE

COUT

ESR

≤

Table 83. Suggested VBUSx Capacitors

Vendor

Part Number

Value (µF)

Voltage (V)

Size

Murata

GRM188R61E225K

2.2

0603

TDK

C1608X5R1E225

2.2

0603

Table 84. Suggested CFL1 Capacitors

Vendor

Part Number

Value (µF)

Voltage (V)

Size

Murata

GRM188R60J475K

4.7

6.3

0603

TDK

C1608X5R0J475K

4.7

6.3

0603

Table 85. Suggested CFL2 Capacitors

Vendor

Part Number

Value (µF)

Voltage (V)

Size

Murata

GRM188R60J225K

2.2

6.3

0603

TDK

C1608X5R0J475K

2.2

6.3

0603

Table 86. Suggested ISOS and ISOB Capacitors

Vendor

Part Number

Value

(µF)

Voltage

(V)

Size

Murata

GRM188R60J106K

6.3

0603

TDK

C1608X5R0J106M080AB

6.3

0603

LDO Capacitor Selection

Connecting a 1 μF capacitor from VIN123 to AGND reduces

the circuit sensitivity to the PCB layout, especially when long

input traces or high source impedance are encountered.

The ADP5350 is designed for operation with small, space-saving

ceramic capacitors, but functions with most commonly used

capacitors as long as care is taken with regard to the ESR value.

The ESR of the output capacitor affects the stability of the LDO

control loop. A minimum of 1 μF capacitance with an ESR of

1 Ω or less is recommended to ensure stability of the ADP5350.

Transient response to changes in load current is also affected by

output capacitance. Using a larger value of output capacitance

improves the transient response of the ADP5350 to large changes

in load current.

Table 87. Suggested LDO Capacitors

Vendor

Part Number

Value

(µF)

Voltage

(V)

Size

Murata

GRM155R60J105KE19D

6.3

0402

TDK

CGB2A3X5R0J105M033BB

6.3

0402

Boost Capacitor Selection

The ADP5350 requires input and output decoupling capacitors

to supply transient currents while maintaining a constant input

and output voltage. Use a low ESR input capacitor, 4.7 μF or

greater, to prevent noise at the VIN4 node. Place the capacitor

between the VIN4 pin and PGND4 as close to the ADP5350 as

possible. Ceramic capacitors are preferred because of their low

ESR characteristics.

The output capacitor maintains the output voltage and supplies

current to the load while the boost switch is on. The value and

characteristics of the output capacitor greatly affect the output

voltage ripple and stability of the regulator. Use a low ESR

output capacitor; ceramic dielectric capacitors are preferred.

For very low ESR capacitors, such as ceramic capacitors, the

ripple current due to the capacitance is calculated as follows.

Because the capacitor discharges during the on time the charge

removed from the capacitor is the load current multiplied by

the on time. Choose the output capacitor based on the following

equation:

(

)

RIPPLE4

OUT4

SW4

IN4

OUT4

−

≥

where:

IL2 is the average inductor current.

VRIPPLE4 is boost output voltage ripple.

Table 88. Suggested Boost Capacitors

Vendor

Part Number

Value

(µF)

Voltage

(V)

Size

Murata

GRM188R61C475ME11

4.7

0603

TDK

C1608X5R1E475M080AC

4.7

0603

Murata

GRM188R61E106MA73

0603

TDK

C1608X5R1E106M080AC

0603

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