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LTC4007-1 Datasheet(PDF) 11 Page - Linear Technology

Part # LTC4007-1
Description  4A, High Efficiency, Li-Ion Battery Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4007-1 Datasheet(HTML) 11 Page - Linear Technology

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LTC4007-1
40071f
gate of the input FET is driven to a voltage sufficient to keep
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 LTC4007-1 charger controller uses a constant off-
time, current mode step-down architecture. During nor-
mal operation, 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 com-
parator 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.
The peak inductor current, at which ICMP resets the SR
latch, is controlled by the voltage on ITH. ITH is in turn
controlled by several loops, depending upon the situation
at hand. The average current control loop converts the
voltage between CSP and BAT to a representative current.
Error amp CA2 compares this current against the desired
current programmed by RPROG at the PROG pin and
TGATE
OFF
ON
BGATE
INDUCTOR
CURRENT
tOFF
TRIP POINT SET BY ITH VOLTAGE
ON
OFF
40071 F01
Figure 1
OPERATIO
LTC4007-1: State Diagram
40071 TBL01
MASTER
SHUTDOWN
SHUTDOWN
ANY
1
2
4
11
12, 13, 14, 15, 16
3, 17, 18,
19, 20, 21
3, 8,
9, 10
5, 6, 7
CONDITION
CHARGE


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