LTC1730-4 LINER [Linear Technology], LTC1730-4 Datasheet - Page 6

• Manufacturer Part Number: LTC1730-4
• Description: Lithium-Ion Battery Pulse Charger with Overcurrent Protection
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
BLOCK DIAGRA
LTC1730-4/LTC1730-4.2
N-channel MOSFET. This output can sink up to 5mA
suitable for driving an LED.
FAULT (Pin 5): Fault Condition Detection Open-Drain
Output. This output can sink up to 3mA suitable for driving
an external LED. The internal N-channel MOSFET pulls this
pin to ground when either one of the following conditions
is detected:
1. The voltage at the NTC pin is out of the normal operation
2. The BAT pin potential stays below 2.45V for more
6
range. This usually means the battery pack temperature
is too high or too low. Once the temperature is back to
normal, the FAULT pin becomes high impedance.
than 1/4 of the programmed charge time. When this
U
NTC/SHDN
FAULT
CHRG
ACPR
U
121mV
0.125R
0.375R
0.5R
U
N1
–
+
–
+
+
–
OSCILLATOR
W
C6
C7
C8
TIMER
40 A
COLD
HOT
SHDN
CLK
FAULT
C/10
ON
STOP
LOGIC
RECHRG
I
MAX
ACPR
V
V
V
MAX
MIN
BAT
CHRG (Pin 6): Refer to LTC1730ES8-4.2
NC (Pins 7, 14): No Internal Connection. Connecting these
pins to ground will help transfer heat from the package.
TIMER (Pin 10): Refer to LTC1730ES8-4.2
NTC/SHDN (Pin 11): Refer to LTC1730ES8-4.2
SEL (Pin 12): 4.1V/4.2V Battery Selection Input. Ground-
ing this pin will set the output float voltage to 4.1V, while
connecting to V
GATE (Pin 13): Refer to LTC1730ES8-4.2
BAT (Pin 15): Refer to LTC1730ES8-4.2
condition is detected, the FAULT pin is pulled low and
latched.
C4
C9
40mV
+
–
–
+
+
–
150mV
V
CC
–
+
Q-PUMP
CC
4.1V/4.2V
(3X)
will set the voltage to 4.2V.
C5
C3
C2
C1
N
100mV
SW
+
–
–
+
–
+
–
+
35mA
1.21V
–
+
GND
R1
R2
R3
R4
R5
SENSE
GATE
BAT
SEL
1703 BD
1730f