Diodes API9221 Manual do Utilizador descarregar pdf (Página 10)

API9221

R/WALL or USB SUPPLY INPUT LITHIUM BATTERY

CHARGER with OVP USB BYPASS and 10mA LDO

API9221

Document number: DS32204 Rev. 2 - 2

10 of 15

www.diodes.com

November 2011

NEW PRODUCT

Functional Characteristics (cont.)

Power Supply Filtering and Stability

At each of the inputs VDC and VUSB, a local decoupling

capacitor is required to be connected to GND. A

minimum value of 1µF is recommended, ceramic type

X7R. (The USB standard sets an upper bound of

capacitance somewhat larger than this.)

At the linear regulator output VDC_LDO, a local

decoupling capacitor is required, connected to GND. A

value of 1µF is recommended, ceramic type X7R.

At the battery connection BAT, a local decoupling

capacitor is required, connected to GND. A value of 1µF

is recommended, ceramic type X7R.

Timing Diagram

PPR

VUSB

VDC

VDC_LDO

USB_BYP

VBAT

IUSB

IVDC

CHG

4.94V

USB_BYP

CHRG

LDO

CHRG

ENABLED

5.4V OVP

VUSB

6.9V OVP

VDC

OVP

VDC

-HOVP

VDC

OVP

VUSB

-HOVP

VUSB

PO = Power-ON

CHRG

= Battery Charging Current

1 2 ... 5 6 7 8 9 10 11 12 13 14 15

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