POWER LOSS (mW)
LTC4009
LTC4009-1/LTC4009-2
High Efficiency,
Multi-Chemistry
Battery Charger
Fae Tseru Dpircse Tnoi
n
General Purpose Battery Charger Controller
The LTC 4009 is a constant-current/constant-voltage
n
Efficient 550kHz Synchronous Buck PWM Topology
battery charger controller. It uses a synchronous quasi-
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0.5% Output Float Voltage Accuracy
constant frequency PWM control architecture that will
n
Programmable Charge Current: 4% Accuracy
not generate audible noise with ceramic bulk capacitors.
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Programmable AC Adapter Current Limit:
Charge current is set by the combination of external
3% Accuracy
sense, input and programming resistors. With no built-in
n
No Audible Noise with Ceramic Capacitors
termination, the LTC4009 family charges a wide range of
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Wide Input Voltage Range: 6V to 28V
batteries under external control.
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Wide Output Voltage Range: 2V to 28V
The LTC4009 features a fully adjustable output voltage, while
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Indicator Outputs for AC Adapter Present, Charging,
the LTC4009-1 and LTC4009-2 can be pin-programmed for
C/10 Current Detection and Input Current Limiting
lithium-ion/polymer battery packs of 1-, 2-, 3- or 4-series
n
Analog Charge Current Monitor
cells. The LTC4009-1 provides output voltage of 4.1V/cell,
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Micropower Shutdown
and the LTC4009-2 is a 4.2V/cell version.
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Thermally Enhanced 20-Pin 4mm 4mm 0.75mm
The device includes AC adapter input current limiting which
QFN Package
maximizes the charge rate for a fixed input power level. An
external sense resistor programs the input current limit, and
a acilpp Tsnoi
the ICL status pin indicates when the battery charge current
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Notebook Computers
is being reduced as a result of AC adapter current limiting.
n
Portable Instruments
n The CHRG status pin is active during all charging modes,
Battery Backup Systems
including special indication for low charge current.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents including 5723970.
T lacipy a acilpp Tnoi
FROM
33m
POWER TO
ADAPTER
SYSTEM
13V TO 20V 0.1F 20F
0.1F
Efficiency at DCIN = 20V
DCIN CLP
5.1k
14.3k
CLN
100 10000
DCDIV
BOOST
0.1F
LTC4009
1.5k
95
TGATE
EFFICIENCY
CHRG
SW
90
ACP INTV
DD
TO/FROM
POWER LOSS
2F
MCU
85 1000
ICL BGATE 6.8H
SHDN GND
V = 12.3V
OUT
80
3.01k
R = 33m
SENSE
ITH CSP
R = 3.01k
IN
6.04k R = 26.7k
75 PROG
33m
D = SSB44
IN
3.01k
0.1F
L = IHLP-2525CZ 6.8H
CSN
70 100
BAT 0 0.5 1.0 1.5 2.0 2.5 3.0
CHARGE
+
CHARGE CURRENT (A)
CURRENT PROG FBDIV 20F 12.3V
MONITOR Li-Ion
301k 4009 TA01b
26.7k
4.7nF
BATTERY
V
FB
4009 TA01a
32.8k
4009fd
EFFICIENCY (%)LTC4009
LTC4009-1/LTC4009-2
a ulosb T e Mixa Mu M r a Tsgni (Note 1)
DCIN, CLP, CLN or SW to GND ................... 0.3V to 30V ACP, CHRG or ICL to GND .......................... 0.3V to 30V
CLP to CLN ............................................................0.3V Operating Temperature Range
CSP, CSN or BAT to GND ........................... 0.3V to 28V (Note 2) ............................................. 40C to 125C
CSP to CSN ............................................................0.3V Junction Temperature (Note 3) ............................. 125C
BOOST to GND ........................................... 0.3V to 36V Storage Temperature Range .................. 65C to 150C
BOOST to SW............................................... 0.3V to 7V
DCDIV, SHDN, FVS0, FVS1 or V to GND ... 0.3V to 7V
FB
p ni c no Farugi Tnoi
LTC4009 LTC4009-1
LTC4009-2
TOP VIEW TOP VIEW
20 19 18 17 16 20 19 18 17 16
CLN CSP CLN CSP
1 15 1 15
CLP 2 14 CSN CLP 2 14 CSN
DCIN 3 21 13 PROG DCIN 3 21 13 PROG
ICL 4 12 ITH ICL 4 12 ITH
DCDIV 11 BAT DCDIV 11 BAT
5 5
6 7 8 9 10 6 7 8 9 10
UF PACKAGE UF PACKAGE
20-LEAD (4mm 4mm) PLASTIC QFNs 20-LEAD (4mm s 4mm) PLASTIC QFN
T = 125C, = 37C/W T = 125C, = 37C/W
JMAX JA JMAX JA
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
o r D re i n Fro Ma Tnoi
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4009CUF#PBF LTC4009CUF#TRPBF 4009 0C to 85C
20-Lead (4mm 4mm) Plastic QFN
LTC4009CUF-1#PBF LTC4009CUF-1#TRPBF 40091 20-Lead (4mm 4mm) Plastic QFN 0C to 85C
LTC4009CUF-2#PBF LTC4009CUF-2#TRPBF 40092 20-Lead (4mm 4mm) Plastic QFN 0C to 85C
LTC4009IUF#PBF LTC4009IUF#TRPBF 4009 40C to 125C
20-Lead (4mm 4mm) Plastic QFN
LTC4009IUF-1#PBF LTC4009IUF-1#TRPBF 40091 40C to 125C
20-Lead (4mm 4mm) Plastic QFN
LTC4009IUF-2#PBF LTC4009IUF-2#TRPBF 40092 40C to 125C
20-Lead (4mm 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: