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| 型號(hào)： | LTC4012IUF-1#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20 |
| 文件頁(yè)數(shù)： | 13/28頁(yè) |
| 文件大小： | 381K |
| 代理商： | LTC4012IUF-1#TRPBF |
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LTC4012/
LTC4012-1/LTC4012-2
0
4012fa
applications inForMation
Table 5. Digital Read Back State (IN, Figure 10)
LTC4012
CHARGER STATE
OUT STATE
Hi-Z
1
Off
1
C/10 Charge
0
1
Bulk Charge
0
Input and Output Capacitors
In addition to typical input supply bypassing (0.1F) on
DCIN, the relatively high ESR of aluminum electrolytic ca-
pacitors is helpful for reducing ringing when hot-plugging
the charger to the AC adapter. Refer to LTC Application
Note 88 for more information.
The input capacitor between system power (drain of top
FET, Figure 1) and GND is required to absorb all input PWM
ripplecurrent,thereforeitmusthaveadequateripplecurrent
rating. Maximum RMS ripple current is typically one-half
of the average battery charge current. Actual capacitance
value is not critical, but using the highest possible voltage
rating on PWM input capacitors will minimize problems.
Consult with the manufacturer before use.
Figure 10. Microprocessor Status Interface
33k
200k
4012 F10
VDD
3.3V
P
IN
OUT
LTC4012
CHRG 7
C/10 CHRG Indicator
The value chosen for RPROG has a strong influence
on charge current monitoring and the accuracy of the
C/10 charge indicator output (CHRG). The LTC4012
uses the voltage on the PROG pin to determine when
charge current has dropped to the C/10 threshold.
The nominal threshold of 400mV produces an accu-
rate low charge current indication of C/10 as long as
RPROG = 26.7k, independent of all other current pro-
gramming considerations. However, it may sometimes
be necessary to deviate from this value to satisfy other
application design goals.
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
LTC4012 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
(
)
Direct digital monitoring of C/10 indication is possible
with an external application circuit like the one shown in
Figure 9.
By using two different value pull-up resistors, a micropro-
cessorcandetectthreestatesfromthispin(charging,C/10
andnotcharging).SeeFigure10.Whenadigitaloutputport
(OUT) from the microprocessor drives one of the resistors
andaseconddigitalinputportpollsthenetwork,thecharge
state can be determined as shown in Table 5.
Figure 9. Digital C/10 Indicator
17
7
INTVDD
CHRG
Q1
TP0610T
Q2
2N7002
100k
LTC4012
4012 F09
100k
VLOGIC
100k
C/10
CHRG
100k
Q3
2N7002
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