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参数资料
| 型号： | LTC4009IUF#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20 |
| 文件页数： | 11/28页 |
| 文件大小： | 351K |
| 代理商： | LTC4009IUF#PBF |
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4009fd
LTC4009
LTC4009-1/LTC4009-2
applicaTions inForMaTion
If RPROG is greater than 26.7k, the actual level at which
low charge current is detected will be less than C/10. The
highest value of RPROG that can be used while reliably
indicating low charge current before reaching final VBAT
is 30.1k. RPROG can safely be set to values higher than
this, but low current indication will be lost.
If RPROG is less than 26.7k, low charge current detection
occurs at a level higher than C/10. More importantly, the
LTC4009 becomes increasingly sensitive to reverse cur-
rent. The lowest value of RPROG that can be used without
the risk of erroneous boost operation detection at end of
charge is 26.1k. Values of RPROG less than this should not
be used. See the Operation section for more information
about reverse current.
The nominal fractional value of IMAX at which C/10 indica-
tion occurs is given by:
I
mV R
A
V R
C
MAX
PROG
10
400
11 67
1 2085
=
(
)
–
.
.
–
.
11 67A
(
)
DirectdigitalmonitoringofC/10indicationispossiblewith
anexternalapplicationcircuitliketheoneshowninFigure 9.
The LTC4009 initially indicates C/10 until the PWM has
started and the actual charge current can be determined
(PROG pin voltage). The 0.1F capacitor from CHRG to
GND is used to filter this initial pulse, which is typically
less than 2ms when starting toward a final charge current
that is actually greater than C/10. If external circuitry is
insensitive to, or can ignore, this momentary C/10 indica-
tion at start-up, the capacitor can be omitted.
By using two different value pull-up resistors, a micro-
processor can detect three states from this pin (charging,
C/10 and not charging). See Figure 10. When a digital
output port (OUT) from the microprocessor drives one
of the resistors and a second digital input port polls the
network, the charge state can be determined as shown
in Table 5.
Figure 9. Digital C/10 Indicator
Figure 10. Microprocessor Status Interface
17
8
INTVDD
CHRG
Q1
TP0610T
Q2
2N7002
100k
LTC4009
4009 F09
100k
VLOGIC
100k
C/10
CHRG
100k
0.1F
Q3
2N7002
33k
200k
4009 F10
VDD
3.3V
P
IN
OUT
LTC4009
CHRG 8
Table 5. Digital Read Back State (IN, Figure 10)
LTC4009
CHARGER STATE
OUT STATE
Hi-Z
1
Off
1
C/10 Charge
0
1
Bulk Charge
0
相关PDF资料 |
PDF描述 |
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| LTC4009CUF-1#TRPBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009CUF-2#TRPBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009IUF-1#PBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009CUF-2#PBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009CUF-1#PBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
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