LTC4160-1 LINER [Linear Technology], LTC4160-1 Datasheet - Page 10

• Manufacturer Part Number: LTC4160-1
• Description: Switching Power Manager with USB On-The-Go And Overvoltage Protection
• Manufacturer: LINER [Linear Technology]

PIN FUNCTIONS
LTC4160/LTC4160-1
OVGATE (Pin 1): Overvoltage Protection Gate Output.
Connect OVGATE to the gate pin of an external N-channel
MOSFET. The source of the transistor should be connected
to V
DC input connector. In the absence of an overvoltage con-
dition, this pin is connected to an internal charge pump
capable of creating suffi cient overdrive to fully enhance
the MOSFET. If an overvoltage condition is detected, OV-
GATE is brought rapidly to GND to prevent damage to the
LTC4160/LTC4160-1. OVGATE works in conjunction with
OVSENS to provide this protection.
OVSENS (Pin 2): Overvoltage Protection Sense Input.
OVSENS should be connected through a 6.2k resistor to
the input power connector and the drain of an external
N-channel MOSFET. When the voltage on this pin exceeds
V
able the MOSFET and protect the LTC4160/LTC4160-1.
The OVSENS pin shunts current during an overvoltage
transient in order to keep the pin voltage at 6V.
VBUSGD (Pin 3): Logic Output. This is an open-drain
output which indicates that V
V
to provide indication.
FAULT (Pin 4): Logic Output. This in an open-drain output
which indicates a bad battery fault when the charger is
enabled or a short circuit condition on V
bidirectional PowerPath switching regulator is in step-up
mode (On-The-Go). FAULT requires a pull-up resistor
and/or LED to provide indication.
ID (Pin 5): Logic Input. This pin independently enables
the bidirectional switching regulator to step-up the volt-
age on V
USB On-The-Go applications. If the host does not power
down V
a USB micro-AB receptacle. Active low. Has an internal
2.5μA pull-up current source.
ENOTG (Pin 6): Logic Input. This pin independently enables
the bidirectional switching regulator to step-up the voltage
on V
On-The-Go applications. Active high. Has an internal 1.8μA
10
OVCUTOFF,
DUVLO
BUS
OUT
. VBUSGD requires a pull-up resistor and/or LED
and the drain should be connected to the product’s
BUS
and provide a 5V output on the V
OUT
the OVGATE pin will be pulled to GND to dis-
then connect this pin directly to the ID pin of
and provide a 5V output on the V
BUS
is above V
BUS
BUS
pin for USB
BUS
when the
UVLO
pin for
and
pull-down current source.
ENCHARGER (Pin 7): Logic Input. This pin enables the
battery charger. Active low. Has an internal 1.8μA pull-
down current source.
PROG (Pin 8): Charge Current Program and Charge Cur-
rent Monitor Pin. Connecting a 1% resistor from PROG to
ground, programs the charge current. If suffi cient input
power is available in constant-current mode, this pin servos
to 1V. The voltage on this pin always represents the actual
charge current by using the following formula:
CHRG (Pin 9): Logic Output. This is an open-drain out-
put that indicates whether the battery is charging or not
charging. CHRG requires a pull-up resistor and/or LED to
provide indication.
IDGATE (Pin 10): Ideal Diode Amplifi er Output. This pin
controls the gate of an optional external P-channel MOSFET
used as an ideal diode between V
ideal diode operates in parallel with the internal ideal diode.
The source of the P-channel MOSFET should be connected
to V
external ideal diode MOSFET is not used, IDGATE should
be left fl oating.
BAT (Pin 11): Single Cell Li-Ion Battery Pin. Depending on
available V
deliver power to V
from V
V
Path Switching Regulator in Step-Down Mode and Input
Voltage of the Battery Charger. The majority of the portable
product should be powered from V
LTC4160-1 will partition the available power between the
external load on V
Priority is given to the external load and any extra power
is used to charge the battery. An ideal diode from BAT to
V
the allotted power from V
is removed. In On-The-Go mode, this pin delivers power
to V
OUT
OUT
I
BAT
OUT
BUS
ensures that V
(Pin 12): Output Voltage of the Bidirectional Power-
OUT
=
and the drain should be connected to BAT. If the
via the SW pin. V
R
V
BUS
via the battery charger.
PROG
PROG
power, a Li-Ion battery on BAT will either
OUT
• 1030
OUT
OUT
through the ideal diode or be charged
is powered even if the load exceeds
and the internal battery charger.
BUS
OUT
or if the V
should be bypassed with a
OUT
and BAT. The external
OUT
BUS
. The LTC4160/
power source
41601f