Datasheet

L1
A1
VIN
A2
EN
A3
GND
B1
ILIM0
B2
ILIM1
B3
L2
C1
PFM/PWM
C2
PG
C3
VOUT
D1
FB
D2
SS
D3
U4
TPS63051YFF
REG_VDD
10µF
C9
GND
GND
GND
10µF
C10
GND
VBQOUT
4.7µF
C4
GND
Yellow
D14
10.0k
R33
1.50k
R34
GND
0
R36
DNP
0
R37
VBQOUT
1000pF
C18
VBQOUT
47µF
C19
L1
LQM21PN1R0MC0D
TS
1
BAT
2
BAT
3
CE
4
EN2
5
EN1
6
PGOOD
7
VSS
8
CHG
9
OUT
10
OUT
11
ILIM
12
IN
13
TMR
14
ITERM
15
ISET
16
EP
17
U3
BQ24232RGTR
GND
8.66k
R17
GND
14.7k
R16
7.32k
R13
10.0k
R12
1.50k
R9
Orange
D13
5 4 6 7
3 1 2
S2
EG1257
0
R11
VUSB
0
R14
DNP
GND
GND
0
R15
DNP
0
R18
GND
VBQOUT
VBQOUT
VBQOUT
GND
0
R19
GND
GND
VBAT
4.7µF
C16
4.7µF
C15
GND
GND
1µF
C17
Battery Management
1
2
3
4
5
6
7
10
11
8
9
J2
ZX62-B-5PA(11)
GND
DC
DD
RST
0
R40
DNP
0
R41
DNP
0
R42
DNP
VUSB
0
R44
0
R45
DNP
Hardware Overview www.ti.com
CAUTION
TI does not recommend any changes to the circuitry around the BQ24232.
Figure 4. Battery / Power Source Management
5.3 TPS63051 Buck-Boost Converter
The onboard TPS63051 DC-DC converter is used to power the board including the Bluetooth radio and
LEDs. The TPS63051 is a fixed-voltage part meaning that the output voltage is steady at 3.3 V even for
any changes in the battery voltage within the operating conditions. An automatic buck boost switching
converter is desirable in this application to provide a steady output in cases where the battery voltage is
unsteady analogous to the typical voltage drain of a battery. The PGOOD LED D14 indicates that the
board is powered-up and the DC-DC converter is operational. The board is configured in PFM mode
through a resistor R37 which pulls the PFM/PWM pin to low. The REGVDD is the fixed 3.3-V rail for the
board.
Figure 5. Buck-Boost Converter for Board Supply
6
DRV2605EVM-BT User's Guide SLOU391–May 2014
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