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| BQ24153A_14 Datasheet, PDF (34/46 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger With Full USB Compliance and USB-OTG Support | |||
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bq24153A, bq24156A
bq24158, bq24159
SLUSAB0C â OCTOBER 2010 â REVISED JULY 2013
www.ti.com
Table 12. Inductor Part Numbers
PART NUMBER
INDUCTANCE
SIZE
MANUFACTURER
LQM2HPN1R0MJ0
1 μH
2.5 x 2.0 mm
Murata
MIPS2520D1R0
1 μH
2.5 x 2.0 mm
FDK
MDT2520-CN1R0M
1 μH
2.5 x 2.0 mm
TOKO
CP1008
1 μH
2.5 x 2.0 mm
Inter-Technical
2. Determine the output capacitor value (COUT) using 40 kHz as the resonant frequency:
1
fo =
2p ´ LOUT ´ COUT
(9)
1
COUT = 4p2 ´ f02 ´ LOUT
(10)
COUT
=
1
4p2 ´ (40 ´ 103 )2 ´ (1 ´ 10-6 )
(11)
COUT = 15.8 μF
Select two 0603 X5R 6.3V 10-μF ceramic capacitors in parallel i.e., Murata GRM188R60J106M.
3. Determine the sense resistor using the following equation:
R(SNS)
=
V(RSNS)
I(CHARGE)
(12)
The maximum sense voltage across the sense resistor is 85 mV. In order to get a better current regulation
accuracy, V(RSNS) should equal 85mV, and calculate the value for the sense resistor.
R(SNS)
=
85mV
1.25A
(13)
R(SNS) = 68 mâ¦
This is a standard value. If it is not a standard value, then choose the next close value and calculate the real
charge current. Calculate the power dissipation on the sense resistor:
P(RSNS) = I(CHARGE) 2 Ã R(SNS)
P(RSNS) = 1.252 Ã 0.068
P(RSNS) = 0.106 W
Select 0402 0.125-W 68-m⦠2% sense resistor, i.e. Panasonic ERJ2BWGR068.
4. Measured efficiency and total power loss with different inductors are shown in Figure 38. SW node and
inductor current waveform are shown in Figure 39.
34
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