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LTC1980 Datasheet(PDF) 9 Page - Linear Technology

Part # LTC1980
Description  Combination Battery Charger and DC/DC Converter
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1980 Datasheet(HTML) 9 Page - Linear Technology

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LTC1980
9
1980f
The LTC1980 is an IC designed to provide a regulated
voltage to a system load from an unregulated or regulated
wall adapter, or from a battery and also charge a battery,
thereby providing an uninterruptable power source for the
system. When the wall adapter is present it provides
power to the system load and, if needed, a portion of the
power can be used to simultaneously charge the battery.
If the wall adapter is removed, the LTC1980 uses the
battery as a power source to continue providing a regu-
lated output voltage to power the system.
Combining these two functions into a single IC reduces
circuit area compared to presently available solutions
OPERATIO
(Figure 1). The unique bidirectional power converter to-
pology (Figure 2) accounts for much of the area savings.
A transformer based design allows the wall adapter volt-
age to be less than or greater than the battery voltage.
The LTC1980 includes a 300kHz DC/DC PWM converter
that operates in two modes. The first mode is when the wall
adapter is present and the LTC1980 is used to charge the
battery using a constant-current/constant-voltage charge
scheme. The second mode is when the wall adapter is
removed and the battery powers the LTC1980 and the
DC/DC converter generates a regulated output voltage.
POWER ROUTING
Existing Methods
Using the LTC1980
LOW DROPOUT
REGULATOR
TO SYSTEM LOAD
DC/DC CONVERTERS
TO SYSTEM LOAD
DC/DC CONVERTERS
FROM WALL ADAPTER
1980 F01
FROM
WALL ADAPTER
PWM
REGULATOR
BATTERY
CHARGER
CHARGE
TERMINATION
LTC1980-BASED
POWER DESIGN
Figure 1. Portable Power Systems
LTC1980
ISENSE
•
•
Li-Ion
BATTERY
T1
WALL
ADAPTER
1980 F02a
SYSTEM LOAD
DC/DC
CONVERTERS
BAT-FET
REG-FET
RS
Figure 2. LTC1980 Bidirectional Power Conversion
(a) Battery Charger Mode
LTC1980
ISENSE
•
•
Li-Ion
BATTERY
T1
1980 F02a
SYSTEM LOAD
DC/DC
CONVERTERS
BAT-FET
REG-FET
RS
(b) DC/DC Converter Mode (Wall Adapter Removed)



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