ams Datasheet

Page 9

[v1-03] 2015-Aug-31

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AS3728 − Application Information

Figure 11:

Typical Application Circuit

Typical Application: This figure shows the connection of the DCDC controller and the AS3728 Power Stage.

External Components

Figure 12:

Step Down DCDC Power Stage External Components

External Components: Shows the recommended values of the needed external components of the Step Down

DCDC Power Stage.

Symbol

Parameter

Min

Typ

Max

Units

Note

External Components Per Phase

CFB

Output Capacitor

64

82

μF

Ceramic X5R or X7R / 6.3V high

performance

32

47

μF

Ceramic X5R or X7R / 6.3V cost

optimized

CHVSUP

HV Input Capacitor

6

10

μF

Ceramic X5R or X7R / 25V

CBOOST

Boost Capacitor

100

nF

Ceramic X5R or X7R / 6.3V

C5VSUP

5V Supply Capacitor

1

μF

Ceramic X5R or X7R / 6.3V

LInductor

0.5

1

μH

5A rated, 1MHz operation, low RON

Application Information

DCDC

0.6 – 1.5V

8A

1.3MHz

HVSUP

TEMP

CTRL1

5VSUP

CTRL2

BOOST1

LX2

BOOST2

LX 1

PVSS

PVSS

1uH

1uH

FB_SDx

FB_SDx

CTRL2_SDx

CTRL1_SDx

TEMP_SDx

Vout (0.6-1.5V@8A)

DVM, 10mV steps

100nF

100nF

47uF

HVSUP

10uF

10uF

1uF

optional

47uF