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LTC4085EDE-1-PBF Datasheet(PDF) 8 Page - Linear Technology

Part # LTC4085EDE-1-PBF
Description  USB Power Manager with Ideal Diode Controller and 4.1V Li-Ion Charger
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4085EDE-1-PBF Datasheet(HTML) 8 Page - Linear Technology

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LTC4085-1
8
40851f
PI FU CTIO S
IN (Pin 1): Input Supply. Connect to USB supply, VBUS.
Input current to this pin is limited to either 20% or 100%
of the current programmed by the CLPROG pin as deter-
mined by the state of the HPWR pin. Charge current (to
BAT pin) supplied through the input is set to the current
programmed by the PROG pin but will be limited by the
input current limit if charge current is set greater than the
input current limit.
OUT (Pin 2): Voltage Output. This pin is used to provide
controlled power to a USB device from either USB VBUS
(IN) or the battery (BAT) when the USB is not present.
This pin can also be used as an input for battery charging
when the USB is not present and a wall adapter is applied
to this pin. OUT should be bypassed with at least 4.7μF
to GND.
CLPROG (Pin 3): Current Limit Program and Input Cur-
rent Monitor. Connecting a resistor, RCLPROG, to ground
programs the input to output current limit. The current
limit is programmed as follows:
IA
V
R
CL
CLPROG
() =
1000
In USB applications the resistor RCLPROG should be set
to no less than 2.1k.
The voltage on the CLPROG pin is always proportional to
the current flowing through the IN to OUT power path.
This current can be calculated as follows:
IA
V
R
IN
CLPROG
CLPROG
()
=
1000
HPWR (Pin 4): High Power Select. This logic input is used
to control the input current limit. A voltage greater than
1.2V on the pin will set the input current limit to 100% of
the current programmed by the CLPROG pin. A voltage
less than 0.4V on the pin will set the input current limit
to 20% of the current programmed by the CLPROG pin.
A 2μA pull-down is internally applied to this pin to ensure
it is low at power up when the pin is not being driven
externally.
SUSP (Pin 5): Suspend Mode Input. Pulling this pin above
1.2V will disable the power path from IN to OUT. The sup-
ply current from IN will be reduced to comply with the
USB specification for suspend mode. Both the ability to
charge the battery from OUT and the ideal diode function
(from BAT to OUT) will remain active. Suspend mode will
reset the charge timer if VOUT is less than VBAT while in
suspend mode. If VOUT is kept greater than VBAT, such as
when a wall adapter is present, the charge timer will not
be reset when the part is put in suspend. A 2μA pull-down
is internally applied to this pin to ensure it is low at power
up when the pin is not being driven externally.
TIMER (Pin 6): Timer Capacitor. Placing a capacitor, CTIMER,
to GND sets the timer period. The timer period is:
t
Hours
C
R
Hours
Fk
TIMER
TIMER
PROG
()
••
.•
=
μ
3
0 1
100
Charge time is increased if charge current is reduced
due to undervoltage current limit, load current, thermal
regulation and current limit selection (HPWR).
Shorting the TIMER pin to GND disables the battery
charging functions.


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