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BQ2000PN-B5 Datasheet(PDF) 10 Page - Texas Instruments

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Part # BQ2000PN-B5
Description  Programmable Multi-Chemistry Fast-Charge Management IC
Download  29 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

BQ2000PN-B5 Datasheet(HTML) 10 Page - Texas Instruments

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BAT+
Q1
FMMT718
D2
ZHCS1000
L1
47 H
m
C9
1000PF
R12
120OHMS
Q2
MMBT3904LT1
C6
47 F
m
D5
MMSD914LT
D3
MMSD914LT
D4
S1A
DC-
R10
1KW
D1
RED
R2
2KW
C3
10 F
m
D6
BZT52-C5V1
R1
100KW
RC 6
LED
3
BAT
4
VSS
2
TS
5
VCC 7
SNS
1
MOD 8
U1
bq2000
C4
0.0022 F
m
R4
12.4K
VCC
C7
4.7PF
C8
0.33 F
m
Q3
MMBT3904LT1
R11
220 W
R6
210KW
C5
10 F
m
BAT-
THERM
CHEMISTRY
R7
200KW
R9
221KW
R5
20KW
C1
0.1
R8
6.81KW
C2
0.1
NOTES:
1.ForLi-Ion,theCHEMISTRY isleftfloating.
ForNiCd/NiMH,theCHEMISTRY istiedtoBAT-
2.DCinputvoltage:9–16V
4.L1:3L GlobalP/NPKSMD-1005-470K-1A
3.Chargecurrent:1A
R13
1.1K
R3
0.05 W
DC+
bq2000
SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009
www.ti.com
Figure 7. Single-Cell Li-Ion, 3-Cell NiCd/NiMH 1A Charger
Minimum Current (Li-Ion Only)
The bq2000 monitors the charging current during the voltage-regulation phase of Li-Ion batteries. Fast charge is
terminated when the current is tapered off to 14% of the maximum charging current.
Once constant-current fast charge has ended, the bq2000 either measures the value of the CMTO capacitor (in
the case of Nickel batteries) and then proceeds to either top-off or trickle maintenance charge or simply
completes the constant-voltage stage of fast charge (in the case of a Li-Ion cell).
Top-Off and Pulse-Trickle Maintenance Charge
An optional top-off charge is available for NiCd or NiMH batteries. Top-off may be desirable on batteries that
have a tendency to terminate charge before reaching full capacity. To enable this option, the capacitance value
of CMTO connected between the RC pin and VCC (Figure 5) should be greater than 0.13µF, and the value of the
resistor connected to this pin should be less than 250k
Ω. To disable top-off, the capacitance value should be less
than 0.07µF. The tolerance of the capacitor needs to be taken into account in component selection.
Once top-off is started, the timer is reset and top-off proceeds until the timer expires, VMCV is reached, or there is
a temperature fault. During top-off, current is delivered to the battery in pulses that occur each second. The fixed
pulse width allows an average current of 1/16 of the fast charge current to be delivered to the battery every
second. The LED is always off during top-off and trickle maintenance charge.
10
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Copyright © 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): bq2000


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