LTC4160EUDC-1#PBF Linear Technology, LTC4160EUDC-1#PBF Datasheet - Page 16

• Manufacturer Part Number: LTC4160EUDC-1#PBF
• Description: IC, BATT CHRG, Li-Ion, Li-Polymer, 1.2A, QFN20
• Manufacturer: Linear Technology

Specifications of LTC4160EUDC-1#PBF

• Battery Type: Li-Ion, Li-Polymer
• Input Voltage: 5.5V
• Battery Charge Voltage: 4.1V
• Charge Current Max: 1.2A
• Battery Ic Case Style: QFN
• No. Of Pins: 20
• No. Of Series Cells: 1
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

OPERATION
LTC4160/LTC4160-1
OR WALL
ADAPTER
current when the NMOS switch is on. This will cause the
inductor current to run away and the voltage on CLPROG
to rise. When CLPROG reaches 1.2V the switching of the
synchronous PMOS is terminated and V
statically to its gate. This ensures that the inductor current
will have sufficient negative slope during the time current
is flowing out of the V
switching when CLPROG drops down to 1.15V.
The PMOS switch is enabled when V
V
V
ning away when not in current limit. If the PMOS switch is
disabled for more than 7.2ms then the switcher will shut
off, the FAULT pin will go low and a short circuit fault will be
declared. To re-enable step-up mode, the ENOTG pin, with
ID high, must be cycled low and then high or the ID pin, with
ENOTG grounded, must be cycled high and then low.
Ideal Diode(s) from BAT to V
The LTC4160/LTC4160-1 each have an internal ideal diode
as well as a controller for an external ideal diode. Both the
internal and the external ideal diodes are always on and
will respond quickly whenever V
16
TO USB
OUT
OUT
+ 70mV to prevent the inductor current from run-
+ 180mV and is disabled when it falls below
13
17
1
2
V
CLPROG
OVGATE
OVSENS
I
SWITCH
BUS
1.18V
/N
BUS
5.1V
–
+
×2
CONTROLLER
AVERAGE V
OVERVOLTAGE PROTECTION
VOLTAGE
pin. The PMOS will resume
V
CURRENT LIMIT
CONTROLLER
BUS
OUT
–
+
OUT
BUS
+
–
OUTPUT
Figure 3. PowerPath Block Diagram – USB On-The-Go
+ –
drops below BAT.
BUS
GATE DRIVE
PWM AND
OUT
6V
rises above
is applied
V
CONTROLLER
OUT
VOLTAGE
–
+
+
3.6V
0.3V
+ –
If the load current increases beyond the power allowed
from the bidirectional switching regulator, additional
power will be pulled from the battery via the ideal diode(s).
Furthermore, if power to V
removed, then all of the application power will be provided
by the battery via the ideal diode(s). The ideal diode(s) will
prevent V
tance required for the bidirectional switching regulator. The
internal ideal diode consists of a precision amplifier that
activates a large on-chip P-channel MOSFET whenever
BATTERY CHARGER
I
BAT
/1000
–
+
–
+
OUT
Figure 4. Ideal Diode V-I Characteristics
1V
V
2200
2000
1800
1600
1400
1200
1000
FLOAT
800
600
400
200
from drooping with only the storage capaci-
0
0
FORWARD VOLTAGE (mV) (BAT – V
OmV
IDEAL
DIODE
60
15mV
IDEAL DIODE
120
VISHAY Si2333
OPTIONAL EXTERNAL
IDEAL DIODE
LTC4160-1
–
+
SEMICONDUCTOR
LTC4160/
BATTERY POWER
+
–
180
MBRM120LT3
BUS
IDGATE
240 300
PROG
V
OUT
BAT
SW
(USB or wall adapter) is
14
12
10
11
ON
8
360
OUT
420
+
41601 F04
)
SINGLE CELL
Li-Ion
480
41601 F03
3.5V TO
(BAT + 0.3V)
TO SYSTEM LOAD
41601fa