BQ24765_15 Datasheet, PDF (29/43 Pages) Texas Instruments – SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power MOSFETs

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bq24765
SLUS999A – NOVEMBER 2009 – REVISED NOVEMBER 2015
Typical Application (continued)
9.2.1 Design Requirements
For this design example, use the parameters listed in Table 6.
Table 6. Design Parameters
DESIGN
PARAMETER
Input Voltage⁽¹⁾
Input Current Limit⁽¹⁾
Battery Charge
Voltage ⁽²⁾
Battery Charge
Current ⁽²⁾
Battery Discharge
Current ⁽²⁾
EXAMPLE VALUE
17.7 V < Adapter Voltage < 24 V
3.2 A for 65 W adapter
12592 mV for 3s battery
4096 mA for 3s battery
6144 mA for 3s battery
(1) Refer to adapter specification for Input Voltage and Input Current
Limit.
(2) Refer to battery specification for settings.
9.2.2 Detailed Design Procedure
The parameters are configurable using the evaluation software, SLVC309. The simplified application circuit (see
Figure 17) shows the minimum capacitance requirements for each pin. Inductor, capacitor, and MOSFET
selection are explained in the rest of this section. Refer to the bq24765 EVM (HPA349) User's Guide, SLUU415
for the full application schematic.
Table 7. Component List For Typical System Circuit of bq24765
PART DESIGNATOR
Q1, Q2, Q6
RAC, RSR
L1
4xC2, 2xC9, 3xC13
C1
C3, C7, C11
C6
C4, C5, C10, C11, C12, C13,
C15
C8
C16
C17
C18
RC1
RC6
R3, R4, R5, R6, R7
R1
R2
R8
R9
R10
R11
R12
R13
Qty
DESCRIPTION
3 P-channel MOSFET, –30 V, –7.5 A, SO-8, Vishay-Siliconix, Si4835
2 Sense Resistor, 10 mΩ, 1 W, 2010, Vishay-Dale, WSL2010R0100F
1 Inductor, 2.2 µH, 8 A, 20 mΩ, Vishay, IHLP2525CZ01-2R2
9 Capacitor, Ceramic, 10 µF, 35 V, 20%, X5R, 1206, Panasonic, ECJ-3YB1E106M
1 Capacitor, Ceramic, 2.2 µF, 25 V, 1210
3 Capacitor, Ceramic, 1 µF, 25 V, 10%, X7R, 2012, TDK, C2012X7R1E105K
1 Capacitor, Ceramic, 0.47 µF, 25 V, 0805
7 Capacitor, Ceramic, 0.1 µF, 50 V, 10%, X7R, 0805, Kemet, C0805C104K5RACTU
1 Capacitor, Ceramic, 100 pF, 25 V, 10%, X7R, 0805, Kemet
1 Capacitor, Ceramic, 51 pF, 25 V, 10%, X7R, 0805, Kemet
1 Capacitor, Ceramic, 2000 pF, 25 V, 10%, X7R, 0805, Kemet
1 Capacitor, Ceramic, 130 pF, 25 V, 10%, X7R, 0805, Kemet
1 Resistor, thick film chip paralleling, 2x3.9 Ω, 25 V, 1210
1 Resistor, thick film chip, 20 Ω, 0805
5 Resistor, Chip, 10 kΩ, 1/16 W, 5%, 0402
1 Resistor, Chip, 309 kΩ, 1/16 W, 1%, 0402
1 Resistor, Chip, 49.9 kΩ, 1/16 W, 1%, 0402
1 Resistor, Chip, 51.1 kΩ, 1/16 W, 1%, 0402
1 Resistor, Chip, 17.4 kΩ, 1/16 W, 1%, 0402
1 Resistor, Chip, 7.5 kΩ, 1/16 W, 5%, 0402
1 Resistor, Chip, 4.7 kΩ, 1/16 W, 5%, 0402
1 Resistor, Chip, 200 kΩ, 1/16 W, 5%, 0402
1 Resistor, Chip, 1.4 MegΩ, 1/16 W, 1%, 0402
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