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Linear Technology Electronic Components Datasheet

LTC4012IUF Datasheet

Multi-Chemistry Battery Charger

No Preview Available !

LTC4012/
LTC4012-1/LTC4012-2
Features
High Efficiency,
Multi-Chemistry Battery Charger
with PowerPath Control
Description
n General Purpose Battery Charger Controller
n Efficient 550kHz Synchronous Buck PWM Topology
n ±0.5% Output Float Voltage Accuracy
n Programmable Charge Current: 4% Accuracy
n Programmable AC Adapter Current Limit:
3% Accuracy
n No Audible Noise with Ceramic Capacitors
n INFET Low Loss Ideal Diode PowerPath™ Control
n Wide Input Voltage Range: 6V to 28V
n Wide Output Voltage Range: 2V to 28V
n Indicator Outputs for AC Adapter Present, Charging,
C/10 Current Detection and Input Current Limiting
n Analog Charge Current Monitor
n Micropower Shutdown
n 20-Pin 4mm × 4mm × 0.75mm QFN Package
Applications
n Notebook Computers
n Portable Instruments
n Battery Backup Systems
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.
The LTC4012 is a constant-current /constant-volt-
age battery charger controller. It uses a synchronous
quasi-constant frequency PWM control architecture
that will not generate audible noise with ceramic bulk
capacitors. Charge current is set by external resis-
tors and can be monitored as an output voltage.
With no built-in termination, the LTC4012 family charges
a wide range of batteries under external control.
The LTC4012 features fully adjustable output voltage, while
the LTC4012-1 and LTC4012-2 can be pin-programmed for
Lithium-Ion/Polymer battery packs of 1-, 2-, 3- or 4-series
cells. The LTC4012-1 provides output voltage of 4.1V/cell
and the LTC4012-2 is a 4.2V/cell version.
The device includes AC adapter input current limiting, which
maximizes charge rate for a fixed input power level. An
external sense resistor programs the input current limit,
and the ICL status pin indicates reduced charge current as
a result of AC adapter current limiting. Ideal diode control
at the adaptor input improves charger efficiency.
The CHRG status pin is active during all charging modes,
including special indication for low charge current.
Typical Application
FROM
ADAPTER
13V TO 28V
0.1µF
TO/FROM
MCU
6.04k
0.1µF
26.7k
4.7nF
INFET
DCIN
CLP
CLN
BOOST
TGATE
ACP
CHRG
SW
INTVDD
ICL
BGATE
SHDN GND
ITH
CSP
LTC4012
PROG
CSN
BAT
FBDIV
VFB
0.1µF
25mΩ
5.1k
0.1µF
POWER TO
20µF
SYSTEM
2µF
3.01k
3.01k
301k
32.8k
6.8µH
33mΩ
20µF
+
12.3V
Li-Ion
BATTERY
4012 TA01
Efficiency at DCIN = 20V
100
10000
95
EFFICIENCY
90
85
POWER LOSS
1000
80
75
70
0
VOUT = 12.3V
RSENSE = 33mΩ
RIN = 3.01k
RPROG = 26.7k
0.5 1
1.5 2
100
2.5 3
CHARGE CURRENT (A)
PIN NAME
PART INFET DCDIV
LTC4009
X
LTC4012 X
4012 TA02
4012fa



Linear Technology Electronic Components Datasheet

LTC4012IUF Datasheet

Multi-Chemistry Battery Charger

No Preview Available !

LTC4012/
LTC4012-1/LTC4012-2
Absolute Maximum Ratings
(Note 1)
DCIN.............................................................–14V to 30V
DCIN to CLP................................................ –32V to 20V
CLP, CLN or SW to GND............................. –0.3V to 30V
CLP to CLN.............................................................±0.3V
CSP, CSN or BAT to GND............................ –0.3V to 28V
CSP to CSN............................................................±0.3V
BOOST to GND........................................... –0.3V to 36V
BOOST to SW............................................... –0.3V to 7V
SHDN, FVS0, FVS1 or VFB to GND............... –0.3V to 7V
ACP, CHRG or ICL to GND.......................... –0.3V to 30V
Operating Temperature Range
(Note 2).............................................. –40°C to 125°C
Junction Temperature (Note 3).............................. 125°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
LTC4012
TOP VIEW
LTC4012-1
LTC4012-2
TOP VIEW
CLN 1
CLP 2
INFET 3
DCIN 4
ACP 5
20 19 18 17 16
15 CSP
14 CSN
21
GND
13 PROG
12 ITH
11 BAT
6 7 8 9 10
UF PACKAGE
20-LEAD (4mm s 4mm) PLASTIC QFN
TJMAX = 125°C, JA = 37°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
20 19 18 17 16
CLN 1
CLP 2
INFET 3
DCIN 4
ACP 5
15 CSP
14 CSN
21
GND
13 PROG
12 ITH
11 BAT
6 7 8 9 10
UF PACKAGE
20-LEAD (4mm s 4mm) PLASTIC QFN
TJMAX = 125°C, JA = 37°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4012CUF#PBF
LTC4012CUF#TRPBF
4012
20-Lead (4mm × 4mm) Plastic QFN 0°C to 85°C
LTC4012CUF-1#PBF
LTC4012CUF-1#TRPBF 40121
20-Lead (4mm × 4mm) Plastic QFN 0°C to 85°C
LTC4012CUF-2#PBF
LTC4012CUF-2#TRPBF 40122
20-Lead (4mm × 4mm) Plastic QFN 0°C to 85°C
LTC4012IUF#PBF
LTC4012IUF#TRPBF
4012
20-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
LTC4012IUF-1#PBF
LTC4012IUF-1#TRPBF 40121
20-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
LTC4012IUF-2#PBF
LTC4012IUF-2#TRPBF 40122
20-Lead (4mm × 4mm) Plastic QFN –40°C to 125°C
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: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
4012fa



Part Number LTC4012IUF
Description Multi-Chemistry Battery Charger
Maker Linear
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LTC4012IUF Datasheet PDF






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