LTC4063 LINER [Linear Technology], LTC4063 Datasheet - Page 7

• Manufacturer Part Number: LTC4063
• Description: Standalone Linear Li-Ion Charger with Micropower Low Dropout Linear Regulator
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
BAT (Pin 1): Charger Output and Regulator Input. This pin
provides charge current to the battery and regulates the
final float voltage to 4.2V. This pin also supplies power to
the LDO regulator.
OUT (Pin 2): LDO Regulator Output. This pin should be
bypassed with a ≥ 2µF low ESR capacitor as close to the
pin as possible for best performance. The minimum V
is 1.2V.
FB (Pin 3): Regulator Feedback Input. The voltage on this
pin is compared to the internal reference voltage (800mV)
by the error amplifier to keep the output voltage in regula-
tion. An external resistor divider between OUT and FB sets
the output voltage.
LDOEN (Pin 4): LDO Enable Input. A logic high on the
LDOEN pin shuts down the LDO. In this state, OUT
becomes high impedance and the battery drain current
drops to less than 5µA. A logic low on the LDOEN pin
enables the LDO regulator. A 2M pull-down resistor de-
faults the LDO to its enabled state.
CHGEN (Pin 5): Charger Enable Input. A logic high on the
CHGEN pin places the charger into shutdown mode, where
the I
this pin enables battery charging. A 2M pull-down resistor
to ground defaults the charger to its enabled state.
CHRG (Pin 6): Open-Drain Charge Status Output. The
charge status indicator pin has two states: pull-down and
high impedance. This output can be used as a logic
interface or an LED driver. In the pull-down state, an
NMOS transistor capable of sinking 10mA pulls down on
the CHRG pin. The state of this pin is dependent on the
value of I
used. See Applications Information.
TIMER (Pin 7): Timer Program and Termination Select
Pin. This pin selects which method is used to terminate the
charge cycle. Connecting a capacitor, C
selects Charge Time termination. The charge time is set by
the following formula:
U
Time Hours
C
CC
TIMER
quiescent current is less than 65µA. A logic low on
(
DETECT
U
=
0 1
.
)
µ
as well as the termination method being
=
F
3
•
U
Time Hours
Hours
3
(
Hours
(
•
C
0 1
TIMER
)
.
µ
)
F
or
TIMER
, to ground
OUT
Connecting the pin to ground selects Charge Current
termination, while connecting the pin to V
termination. See Applications Information.
IDET (Pin 8): Current Detection Threshold Program Pin.
The current detection threshold, I
necting a resistor, R
following formula:
The CHRG pin becomes high impedance when the charge
current drops below I
the programmed charge current by connecting IDET di-
rectly to PROG. See Applications Information.
This pin is clamped to approximately 2.4V. Driving this pin
to voltages beyond the clamp voltage can draw large
currents and should be avoided.
PROG (Pin 9): Charge Current Program and Charge Cur-
rent Monitor. The charge current is set by connecting a
resistor, R
current mode, this pin servos to 1V. The voltage on this pin
can be used to measure the charge current using the
following formula:
V
the battery charger. This pin should be bypassed with a
1µF capacitor.
Exposed Pad (Pin 11): Ground. This pin is the back of the
Exposed Pad package and must be soldered to the PCB
copper for minimal thermal resistance.
CC
I
I
R
BAT
DETECT
(Pin 10): Positive Input Supply Pin. Provides power to
DET
=
=
R
V
PROG
I
=
DETECT
PROG
PROG
100
10
R
PROG
, to ground. When charging in constant
R
V
DET
• 1000
DET
DETECT
•
I
, to ground. I
CHG
. I
=
DETECT
100
R
DET
DETECT
V
can be set to 1/10th
DETECT
or
, is set by con-
LTC4063
CC
selects User
is set by the
4063fb
7