LTC4066 LINER [Linear Technology], LTC4066 Datasheet - Page 10

• Manufacturer Part Number: LTC4066
• Description: USB Power Controller and Li-Ion Linear Charger with Low Loss Ideal Diode
• Manufacturer: LINER [Linear Technology]

LTC4066/LTC4066-1
CLPROG (Pin 22): Current Limit Program and Input Cur-
rent Monitor. Connecting a resistor, R
programs the input to output current limit. The current
limit is programmed as follows:
In USB applications the resistor R
to no less than 2.1k.
The voltage on the CLPROG pin is always proportional to
the current fl owing through the IN to OUT power path.
This current can be calculated as follows:
PIN FUNCTIONS
10
I
I
CL
IN
( )
( ) =
A
A
=
R
V
R
1000
CLPROG
CLPROG
CLPROG
V
•
1000
CLPROG
CLPROG
should be set
, to ground
PROG (Pin 23): Charge Current Program. Connecting a
resistor, R
current. The battery charge current is programmed as
follows:
I
of the current fl owing into or out of the BAT pins fl ows
out of this pin. The POL polarity pin indicates which
direction current is fl owing. If the current fl owing into
the BAT pins drops below 1mA, then the I
continue to source 1μA. The I
charge current level at which the CHRG pin transitions to
its high impedance state. When the I
below 0.1V while charging in constant voltage mode the
CHRG pin will transition to a high impedance state. This
corresponds to a BAT current of:
STAT
I
I
CHG
BAT
(Pin 24): Battery Current Status Pin. One-thousandth
( )
( )
A
A
PROG
=
=
R
50 000
0 1
R
ISTAT
, to ground programs the battery charge
.
,
PROG
V
•
V
1000
STAT
pin also programs the
STAT
voltage drops
STAT
pin will
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