Datasheet

bq51050B

bq51051B

www.ti.com

SLUSB42D –JULY 2012–REVISED JANUARY 2014

PIN FUNCTIONS (continued)

NAME WCSP QFN I/O DESCRIPTION

Programming pin for the battery charge current. Connect external resistor to VSS. Size R

ILIM

with

ILIM G1 12 I/O

the following equation: R

ILIM

= 300 / I

ILIM

where I

ILIM

is the desired battery charge current.

Connect this pin to the wired adapter input. When a voltage is applied to this pin wireless charging is

AD G4 9 I disabled and AD_EN is driven low. Connect to GND through a 1µF capacitor. If unused, capacitor is

not required and should be grounded directly.

AD-EN F3 8 O Push-pull driver for external PFET when wired charging is active.

Must be connected to ground via a NTC resistor. If an NTC function is not desired, connect to GND

TS/CTRL F1 13 I with a 10 kΩ resistor. As a CTRL pin pull to ground to send end power transfer (EPT) fault to the

transmitter or pull-up to an internal rail (i.e. 1.8 V) to send EPT termination to the transmitter.

Input that allows the termination threshold to be programmable. K

TERM

= 240 Ω/%. Set the

TERM G3 10 I termination threshold by applying the following equation R

TERM

= %I

ILIM

× K

TERM

where %I

ILIM

is the

desired percentage of fast charge current when termination should occur.

EN2=0 enables wired charging source if AD input voltage is above 3.6V, wireless charging is

EN2 G2 11 I enabled if AD input voltage is < 3.6V, EN2=1 disables wired charging source; wireless power is

always enabled if present.

FOD F2 14 I Input for the rectified power measurement. Connect to GND with a 188 Ω resistor.

CHG F4 7 O Open-drain output – active when charging of the battery is active.

Product Folder Links: bq51050B bq51051B