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LTC4009-2

Description
High Effi ciency, Multi-Chemistry Battery Charger
File Size302KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC4009-2 Overview

High Effi ciency, Multi-Chemistry Battery Charger

FEATURES
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LTC4009
LTC4009-1/LTC4009-2
High Efficiency,
Multi-Chemistry
Battery Charger
DESCRIPTION
The LTC4009 is a constant-current/constant-voltage battery
charger controller. It uses a synchronous quasi-constant
frequency PWM control architecture that will not generate
audible noise with ceramic bulk capacitors. Charge cur-
rent is set by the combination of external sense, input and
programming resistors. With no built-in termination, the
LTC4009 family charges a wide range of batteries under
external control.
The LTC4009 features a fully adjustable output voltage, while
the LTC4009-1 and LTC4009-2 can be pin-programmed for
lithium-ion/polymer battery packs of 1-, 2-, 3- or 4-series
cells. The LTC4009-1 provides output voltage of 4.1V/cell,
and the LTC4009-2 is a 4.2V/cell version.
The device includes AC adapter input current limiting which
maximizes the charge rate for a fixed input power level. An
external sense resistor programs the input current limit, and
the
ICL
status pin indicates when the battery charge current
is being reduced as a result of AC adapter current limiting.
The
CHRG
status pin is active during all charging modes,
including special indication for low charge current.
General Purpose Battery Charger Controller
Efficient 550kHz Synchronous Buck PWM Topology
±0.5% Output Float Voltage Accuracy
Programmable Charge Current: 4% Accuracy
Programmable AC Adapter Current Limit:
3% Accuracy
No Audible Noise with Ceramic Capacitors
Wide Input Voltage Range: 6V to 28V
Wide Output Voltage Range: 2V to 28V
Indicator Outputs for AC Adapter Present, Charging,
C/10 Current Detection and Input Current Limiting
Analog Charge Current Monitor
Micropower Shutdown
Thermally Enhanced 20-Pin 4mm
×
4mm
×
0.75mm
QFN Package
APPLICATIONS
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Notebook Computers
Portable Instruments
Battery Backup Systems
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5723970.
TYPICAL APPLICATION
FROM
ADAPTER
13V TO 20V
33mΩ
0.1μF
DCIN
14.3k
CLP
0.1μF
5.1k
100
20μF
POWER TO
SYSTEM
Efficiency at DCIN = 20V
10000
95
EFFICIENCY (%)
90
POWER LOSS
85
80
75
70
V
FLOAT
= 12.3V
R
SENSE
= 33mΩ
R
IN
= 3.01k
R
PROG
= 26.7k
D
IN
= SSB44
L = IHLP-2525CZ 6.8μH
0
0.5
1.0
1.5
2.0
CHARGE CURRENT (A)
2.5
100
3.0
1000
1.5k
CLN
DCDIV BOOST
LTC4009
TGATE
CHRG
SW
INTV
DD
BGATE
GND
0.1μF
EFFICIENCY
POWER LOSS (mW)
TO/FROM
MCU
ACP
ICL
SHDN
ITH
6.04k
0.1μF
2μF
6.8μH
3.01k
CSP
33mΩ
3.01k
CSN
BAT
PROG
4.7nF
26.7k
V
FB
32.8k
FBDIV
301k
20μF
CHARGE
CURRENT
MONITOR
+
12.3V
Li-Ion
BATTERY
4009 TA01a
4009 TA01b
4009fb
1

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