bq51050B
bq51051B
SLUSB42C –JULY 2012–REVISED FEBRUARY 2013
www.ti.com
YFP Package
3.0mm x 1.9mm 28-Pin WCSP
(TOP VIEW)
RHL Package
4.35mm x 3.35mm 20-Pin QFN
(TOP VIEW)
PGND
1
PGND
20
A1
A2
A3
A4
AC1
2
AC2
19
PGND
PGND
PGND
PGND
BOOT1
3
RECT
18
B1
B2
B3
B4
AC2
AC2
AC1
AC1
BAT
4
BOOT2
17
C1
C2
C3
C4
BOOT2
RECT
RECT
BOOT1
CLMP1
5
CLMP2
16
D1
D2
D3
D4
BAT
BAT
BAT
BAT
COM1
6
COM2
15
E1
E2
E3
E4
COM2
CLMP2 CLMP1
COM1
FOD
14
CHG
7
F1
F2
F3
F4
TS/
CTRL
13
AD-EN
8
TS/CTRL
FOD
AD-EN
CHG
G1
G2
G3
G4
AD
9
ILIM
12
ILIM
EN2
TERM
AD
EN2
11
TERM
10
PIN FUNCTIONS
NAME
AC1
WCSP
B3, B4
B1, B2
C4
QFN
I/O
I
DESCRIPTION
2
19
3
Input power from receiver coil.
AC2
I
BOOT1
BOOT2
O
O
Bootstrap capacitors for driving the high-side FETs of the synchronous rectifier. Connect a 10nF
ceramic capacitor from BOOT1 to AC1 and from BOOT2 to AC2.
C1
17
Filter capacitor for the internal synchronous rectifier. Connect a ceramic capacitor to PGND.
Depending on the power levels, the value may be 4.7μF to 22μF.
RECT
BAT
C2, C3
18
4
O
O
D1, D2,
D3, D4
Output pin, delivers power to the battery while applying the internal charger profile.
Open-drain output used to communicate with primary by varying reflected impedance. Connect
through a capacitor to either AC1 or AC2 for capacitive load modulation (COMM2 must be
connected to the alternate AC1 or AC2 pin). For resistive modulation connect COMM1 and COMM2
to RECT via a single resistor; connect through separate capacitors for capacitive load modulation.
COM1
COM2
E4
E1
6
O
O
Open-drain output used to communicate with primary by varying reflected impedance. Connect
through a capacitor to either AC1 or AC2 for capacitive load modulation (COMM1 must be
connected to the alternate AC1 or AC2 pin). For resistive modulation connect COMM1 and COMM2
to RECT via a single resistor; connect through separate capacitors for capacitive load modulation.
15
CLMP1
CLMP2
E3
E2
5
O
O
Open drain FETs which are utilized for a non-power dissipative over-voltage AC clamp protection.
When the RECT voltage goes above 15 V, both switches will be turned on and the capacitors will
act as a low impedance to protect the IC from damage. If used, Clamp1 is required to be connected
to AC1, and Clamp2 is required to be connected to AC2 via 0.47µF capacitors.
16
A1, A2,
A3, A4
PGND
1, 20
–
Power ground
8
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