LTC4099 Linear Technology Corporation, LTC4099 Datasheet - Page 11

• Manufacturer Part Number: LTC4099
• Description: I2C Controlled USB Power Manager/Charger
• Manufacturer: Linear Technology Corporation

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PIN FUNCTIONS
DV
0.01μF bypass capacitor is required.
SCL (Pin 16): Clock Input for the I
input levels are scaled with respect to DV
SDA (Pin 17): Data Input/Output for the I
The I
ACPR (Pin 18): Auxiliary Power Source Present Output
(Active Low). ACPR indicates that the output of an external
high voltage step-down switching regulator connected to
WALL is suitable for use by the LTC4099. ACPR may be
connected to the gate of an external P-channel MOSFET
transistor whose source is connected to V
drain is connected to WALL. ACPR has a high level of V
and a low level of GND.
CLPROG (Pin 19): USB Current Limit Program and Monitor
Pin. A 1% resistor from CLPROG to ground determines
the upper limit of the current drawn from the V
A precise fraction of the input current, h
to the CLPROG pin when the high side switch is on. The
CC
2
(Pin 15): Logic Reference for the I
C input levels are scaled with respect to DV
2
C Serial Port. The I
2
C Serial Port. A
CLPROG
CC
OUT
2
C Serial Port.
.
and whose
, is sent
BUS
CC
.
pin.
OUT
2
C
switching regulator delivers power until the CLPROG pin
reaches 1.18V. Therefore, the current drawn from V
will be limited to an amount given by h
R
available by I
100mA and 500mA USB specifi cations (see Table 2). A
multilayer ceramic averaging capacitor is also required at
CLPROG for fi ltering.
OVSENS (Pin 20): 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 pass transistor. When the voltage on this
pin exceeds V
GND to disable the pass transistor and protect the LTC4099
from potentially damaging high voltage.
Exposed Pad (Pin 21): Ground. The Exposed Pad and pin
must be soldered to the PCB to provide a low electrical
and thermal impedance connection to ground.
CLPROG
. There are a multitude of ratios for h
2
OVCUTOFF
C control, two of which correspond to the
, the OVGATE pin will be pulled to
LTC4099
CLPROG
11
CLPROG
and
BUS
4099f