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LTC4007EGN Datasheet(PDF) 10 Page - Linear Technology

Part # LTC4007EGN
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

LTC4007EGN Datasheet(HTML) 10 Page - Linear Technology

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10
LTC4007
4007fa
a low forward voltage drop from drain to source. If the
voltage between DCIN and CLN drops to less than 25mV,
the input FET is turned off slowly. If the voltage between
DCIN and CLN is ever less than – 25mV, then the input FET
is turned off in less than 10
µs to prevent significant
reverse current from flowing in the input FET. In this
condition, the ACP pin is driven low and the charger is
disabled.
Battery Charger Controller
The LTC4007 charger controller uses a constant off-time,
current mode step-down architecture. During normal op-
eration, the top MOSFET is turned on each cycle when the
oscillator sets the SR latch and turned off when the main
current comparator ICMP resets the SR latch. While the top
MOSFET is off, the bottom MOSFET is turned on until
either the inductor current trips the current comparator
IREV or the beginning of the next cycle. The oscillator uses
the equation:
t
VV
Vf
OFF
DCIN
BAT
DCIN
OSC
=
to set the bottom MOSFET on time. The result is a nearly
constant switching frequency over a wide input/output
voltage range. This activity is diagrammed in Figure 1.
TGATE
OFF
ON
BGATE
INDUCTOR
CURRENT
tOFF
TRIP POINT SET BY ITH VOLTAGE
ON
OFF
4006 F01
Figure 1
OPERATIO
Table 1. Truth Table For Indicator States
TIMER
MODE
DCIN
SHDN
ACP**
LOBAT
FLAG** FAULT**
ICL
STATE
CHG**
Shut down by low adapter voltage
<BAT
LOW
LOW
LOW
HIGH
HIGH
LOW
Reset
HIGH
Charging a low bat
>BAT
LOW
HIGH
LOW
HIGH*
HIGH*
HIGH*
Running
LOW
Normal charging
>BAT
LOW
HIGH
HIGH
HIGH
HIGH*
HIGH*
Running
LOW
Input current limited charging
>BAT
LOW
HIGH
HIGH
HIGH*
HIGH*
LOW
Running
LOW
Charger paused due to thermistor out of range
>BAT
LOW
HIGH
X
X
LOW
HIGH
Paused
LOW
(from
NTC)
Shut down by SHDN pin
X
HIGH
X
X
HIGH
HIGH
LOW
Reset
HIGH
Terminated by low-battery fault (Note 1)
>BAT
LOW
HIGH
LOW
HIGH*
LOW
LOW
>T/4
HIGH
(Faulted)
Timer is reset when FLAG goes low, then
>BAT
LOW
HIGH
HIGH
LOW
HIGH
LOW
>T/4
HIGH
terminates after 1/4 T
after
(Waiting
FLAG =
for Restart)
LOW
Terminated by expired timer
>BAT
LOW
HIGH
HIGH
HIGH
HIGH
LOW
>T
HIGH
(Waiting
for Restart
Timer defeated
XXXXX
XX
X
Forced LOW
Shut down by undervoltage lockout
>BAT
LOW
HIGH
HIGH
HIGH
HIGH*
LOW
Reset
HIGH*
+ <UVL
*Most probable condition X = Don’t care, ** Open-drain output HIGH = OPEN with pull-up
Note 1: If a depleted battery is inserted while the charger is in this state, the
charger must be reset to initiate charging.


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