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PDF LM2601 Data sheet ( Hoja de datos )

Número de pieza LM2601
Descripción Adapter Interface Circuit
Fabricantes National Semiconductor 
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April 2001
LM2601
Adapter Interface Circuit
General Description
The Adapter Interface Circuit (AIC) is used to sense the
presence of an external power source for a portable com-
puter. It notifies the computer if a source is present and
indicates if the source is appropriate for charging battery
packs inside the computer. The AIC also senses an adapter
current and its direction. AIC isolates the adapter and signals
the computer when peak current threshold is exceeded.
LM2601 drives P-channel FETs. No high current rated
Schottky diode is required to implement an adapter switcho-
ver circuit. This significantly decreases additional heat dissi-
pation during simultaneous fast battery charging while run-
ning a computer, particularly in Maximum Performance
mode of operation
Features
n Detects an AC-DC adapter suitable for battery charging
or an airplane or car power line adapter that should not
be used for battery charging
n Allows the implementation of intelligent switchover
circuits for portable systems
n LM2601 shuts down automatically when adapter is
removed
n Low leakage current from battery when not powered
n Drives P-channel FETs, no Schottky diodes are required
n No reverse inrush current from battery into the adapter
output capacitance
n Allows for battery capacity gas-gauge calibration under
system software/firmware control
n Adapter over current threshold programmable with
external resistors
n Wide input range: 5V - 24V
n Available in TSSOP-14 package
Applications
n Portable Computers
n Portable IAs (Internet Appliances, Information
Appliances)
n Other Battery Powered Devices
Block Diagram
© 2001 National Semiconductor Corporation DS101309
10130901
www.national.com

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LM2601 pdf
Typical Delay Time vs. Temperature
Application Information
The adapter interface circuit (AIC) IC provides the control
functions necessary for use in mating a constant voltage
output AC-DC adapter or airline adapter to a notebook com-
puter system or a portable device. It allows optimal battery
charging during computer operation, and allows battery dis-
charge for battery gas gauge calibration. It receives control
signals from the notebook computer, monitors input current
from the adapter, provides adapter voltage status to the
notebook system management microcontroller (or embed-
ded controller), and appropriately drives MOSFET switches
to electrically connect the adapter to the computer.
AIC will allow a system designer to solve various power
management tasks typical for an adapter powered systems
containing a rechargeable battery.
When a notebook computer is being powered from a battery
and the adapter is plugged in, the computer should start
drawing power from the adapter, not from the battery. The
most time efficient charging scenario is when a computer
draws the full rated current from a constant voltage adapter.
The computer uses what it needs to run, and passes all
remaining power on to the battery for charging. The com-
puter should be able to automatically refuse to charge a
battery when powered from an airplane power line. It may be
10130905
necessary sometimes to have a computer fully discharging
the battery and then fully recharging it (for battery gas gauge
calibration purposes) while being powered by an AC adapter.
AIC will also allow a computer to prevent backfeeding cur-
rent into an adapter if the adapter is not powered while being
plugged into the computer (some of existing adapters can
draw current from the computer under this conditions for
charging the AC adapter output bulk capacitance from the
computer battery).
While the lowest usable adapter voltage is about 9.5V, that is
VADAPTER = 11.7V minus 2.2V hysteresis, AIC is operational
down to VADAPTER = 5V. This means that AIC will not gen-
erate false readings down to VADAPTER = 5V. Such false
readings would be MPS = HIGH, ADAPTER PRESENT =
HIGH, CHARGER PRESENT = HIGH.
AIC determines usable voltage ranges by comparing
VADAPTER with an internal 2.5V voltage reference (see also
Electrical Characteristics). AIC detects operating current limit
and leakage current limit into the adapter jack by differential
sensing across current sense resistor RSENSE either directly
or scaled down by resistor dividers R1/R3 and R2/R4.
When designing the LM2601 into a system it may be neces-
sary to consider ESD protection requirements for the
adapter jack according to your system design spec.
5 www.national.com

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