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LTC4006 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4006
Description  4A, High Efficiency, Standalone Li-Ion Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4006 Datasheet(HTML) 9 Page - Linear Technology

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LTC4006
4006fa
OPERATIO
comparesthiscurrentagainstthedesiredcurrentprogrammed
by RIMON at the IMON pin and adjusts ITH until:
V
R
VV
A
k
k
REF
IMON
CSP
BAT
=
–.
11 67
3
3
therefore,
I
V
R
A
k
R
CHARGE
REF
IMON
SENSE
⎝⎜
⎠⎟
–.
11 67
3
The voltage at BAT is divided down by an internal resistor
divider and is used by error amp EA to decrease ITH if the
divider voltage is above the 1.19V reference. When the
charging current begins to decrease, the voltage at IMON
will decrease in direct proportion. The voltage at IMON is
then given by:
VI
R
A
k
R
k
IMON
CHARGE
SENSE
IMON
=+
µ
()
•.
11 67
3
3
Table 1. Truth Table for LTC4006 Operation
MODE
DCIN
BAT VOLTAGE
BAT CURRENT
ACP/SHDN
TIMER STATE
CHG*
Shut Down by Low Adapter Voltage
<BAT
>UVLO
Leakage
LOW
Reset
HIGH
Conditioning a Depleted Battery
>BAT
<2.5V/Cell
10% Programmed
HIGH
Running
LOW
Current
Normal Charging
>BAT
>2.5V/Cell
Programmed
HIGH
Running
LOW
Current
Input Current Limited Charging
>BAT
>2.5V/Cell
Programmed
HIGH
Running
LOW
Current
Charger Paused Due to Thermistor Out of Range
>BAT
X
OFF
HIGH
Paused
LOW or 25
µA
(Faulted)
Shut Down by ACP/SHDN Pin
>BAT
X
OFF
Forced LOW
Reset
HIGH
Terminated by Low-Battery Fault (Note 1)
>BAT
<2.5V/Cell
OFF
HIGH
>T/4 Stopped
HIGH
(Faulted)
Top-Off Charging. C/10 is Latched
>BAT
VFLOAT
OFF
HIGH
<T/4 After C/10
25
µA
Comparator Trip.
Running
Timer is Reset by C/10 Comparator (Latched),
>BAT
VFLOAT
OFF
HIGH
>T/4 After C/10
HIGH
then Terminates After 1/4 T
Comparator Trip.
(Waiting
Stopped
for Restart)
Terminated by Expired Timer
>BAT
VFLOAT**
OFF
HIGH
>T Stopped
HIGH
(Waiting
for Restart)
Timer Defeated. (Low-Battery Conditioning Still
X
X
X
X
X
Forced LOW
Functional)
Shut Down by Undervoltage Lockout
>BAT
<UVL
OFF
HIGH
Reset
HIGH**
and <UVL
Timer Defeated Until VBAT > 3.9V/Cell
>BAT
2.5V
≤ VBAT ≤3.9V
Programmed
HIGH
Running
LOW
(V/Cell)
Current
*Open Drain. High when used with pull-up resistor.
**Most probable condition, X = Don’t care
Note 1: If a depleted battery is inserted while the charger is in this state,
the charger must be reset to initiate charging.
The accuracy of VIMON will range from 0% to ITOL.
VIMON is plotted in Figure 2.
The amplifier CL1 monitors and limits the input current to
a preset level (100mV/RCL). At input current limit, CL1 will
decrease the ITH voltage, thereby reducing charging cur-
rent. When this condition is detected, the C/10 indicator will
Figure 2. VIMON vs ICHARGE
ICHARGE (% OF MAXIMUM CURRENT)
0
0
0.2
0.4
0.6
0.8
4006 F02
1.0
1.2
20
40
60
80
100
1.19V
0.309V


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