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LTC4099EPDC-PBF Datasheet(PDF) 10 Page - Linear Technology

Part # LTC4099EPDC-PBF
Description  I2C Controlled USB Power Manager/Charger with Overvoltage Protection
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4099EPDC-PBF Datasheet(HTML) 10 Page - Linear Technology

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LTC4099
10
4099f
OVGATE (Pin 1): Overvoltage Protection Gate Output.
Connect OVGATE to the gate pin of an external N-channel
MOSFET pass transistor. The source of the transistor should
be connected to VBUS and the drain should be connected
to the product’s DC input connector. In the absence of an
overvoltage condition, this pin is driven from an internal
charge pump capable of creating sufficient overdrive to
fully enhance the pass transistor. If an overvoltage condition
is detected, OVGATE is brought rapidly to GND to prevent
damage to the LTC4099. OVGATE works in conjunction
with OVSENS to provide this protection.
NTC (Pin 2): Input to the Negative Temperature Coefficient
Thermistor Monitoring Circuit. The NTC pin connects to
a negative temperature coefficient thermistor which is
typically copackaged with the battery to determine if the
battery is too hot or too cold to charge. If the battery’s
temperature is out of range, charging is paused until the
battery temperature re-enters the valid range. A low drift
bias resistor is required from NTCBIAS to NTC and a
thermistor is required from NTC to ground.
NTCBIAS (Pin 3): NTC Thermistor Bias Output. Connect a
bias resistor between NTCBIAS and NTC, and a thermistor
between NTC and GND.
VC (Pin 4): Bat-Track Auxiliary Switching Regulator Control
Output. This pin drives the VC pin of an external Linear
Technology step-down switching regulator. In conjunction
with WALL and ACPR, it will regulate VOUT to maximize
battery charger efficiency.
WALL (Pin 5): Auxiliary Power Source Sense Input. WALL
is used to determine when power is available from an
auxiliary power source. When power is detected, ACPR is
driven low and the USB input is automatically disabled.
BATSENS (Pin 6): Battery Voltage Sense Input. For proper
operation, this pin must always be connected to BAT. For
best operation, connect BATSENS to BAT physically close
to the Li-Ion cell.
PROG (Pin 7): Charge Current Program and Charge Current
Monitor Pin. Connecting a resistor from PROG to ground
programs the charge current. If sufficient input power
is available in constant-current mode, this pin servos
to one of eight possible I2C controllable voltages (see
Table 3). The voltage on this pin always represents the
actual charge current by using the following formula:
I
V
R
BAT
PROG
PROG
=
• 1030
IRQ (Pin 8): Open-Drain Interrupt Output. The IRQ pin
can be used to generate an interrupt due to a multitude
of maskable status change events within the LTC4099.
See Table 1.
GND (Pin 9): Ground.
IDGATE (Pin 10): Ideal Diode Amplifier Output. This pin
controls the gate of an external P-channel MOSFET tran-
sistor used to supplement the internal ideal diode. The
source of the P-channel MOSFET should be connected to
VOUT and the drain should be connected to BAT.
BAT (Pin 11): Single-Cell Li-Ion Battery Pin. Depending
on available power and load, a Li-Ion battery on BAT will
either deliver system power to VOUT through the ideal
diode or be charged from the battery charger.
VOUT (Pin 12): Output Voltage of the Switching PowerPath
Controller and Input Voltage of the Battery Charger. The
majority of the portable product should be powered from
VOUT. The LTC4099 will partition the available power be-
tween the external load on VOUT and the internal battery
charger. Priority is given to the external load and any extra
power is used to charge the battery. An ideal diode from
BAT to VOUT ensures that VOUT is powered even if the load
exceeds the allotted power from VBUS or if the VBUS power
source is removed. VOUT should be bypassed with a low
impedance multilayer ceramic capacitor.
VBUS (Pin 13): Input Voltage for the Switching PowerPath
Controller. VBUS will usually be connected to the USB port
of a computer or a DC output wall adapter. VBUS should
be bypassed with a low impedance multilayer ceramic
capacitor.
SW (Pin 14): Switching Regulator Power Transmission
Pin. The SW pin delivers power from VBUS to VOUT via the
step-down switching regulator. An inductor should be con-
nected from SW to VOUT. See the Applications Information
section for a discussion of inductance value.
PIN FUNCTIONS


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