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LTC4012CUF-1#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
1
4012fa
LTC4012/
LTC4012-1/LTC4012-2
Features
applications
Description
High Efficiency,
Multi-Chemistry Battery Charger
with PowerPath Control
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.
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
n
Notebook Computers
n
Portable Instruments
n
Battery Backup Systems
Efficiency at DCIN = 20V
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.
CLP
FROM
ADAPTER
13V TO 28V
0.1µF
5.1k
25mΩ
3.01k
0.1µF
6.8µH
20µF
33mΩ
INFET
0.1µF
2µF
0.1µF
6.04k
26.7k
LTC4012
DCIN
ACP
CHRG
ICL
SHDN
ITH
PROG
CLN
BOOST
TGATE
SW
INTV
DD
BGATE
TO/FROM
MCU
GND
CSP
CSN
BAT
FBDIV
V
FB
20µF
POWER TO
SYSTEM
4.7nF
32.8k
4012 TA01
12.3V
Li-Ion
BATTERY
3.01k
301k
+
CHARGE CURRENT (A)
0
70
EFFICIENCY (%)
POWER LOSS (mW)
75
80
85
90
100
100
1000
10000
0.5
1 1.5 2
4012 TA02
2.5 3
95
PART
LTC4009
LTC4012
INFET
X
DCDIV
X
PIN NAME
V
OUT
= 12.3V
R
SENSE
= 33mΩ
R
IN
= 3.01k
R
PROG
= 26.7k
EFFICIENCY
POWER LOSS
typical application
LTC4012/
LTC4012-1/LTC4012-2
2
4012fa
absolute MaxiMuM ratings
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
(Note 1)
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/
SHDN, FVS0, FVS1 or V
FB
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 LTC4012-1
LTC4012-2
20 19 18 17 16
6 7 8
TOP VIEW
21
GND
UF PACKAGE
20-LEAD (4mm s 4mm) PLASTIC QFN
9 10
5
4
3
2
1
11
12
13
14
15
CLN
CLP
INFET
DCIN
ACP
CSP
CSN
PROG
ITH
BAT
BOOST
TGATE
SW
INTV
DD
BGATE
SHDN
CHRG
ICL
V
FB
FBDIV
T
JMAX
= 125°C,
JA
= 37°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
20 19 18 17 16
6 7 8
TOP VIEW
21
GND
UF PACKAGE
20-LEAD (4mm s 4mm) PLASTIC QFN
9 10
5
4
3
2
1
11
12
13
14
15
CLN
CLP
INFET
DCIN
ACP
CSP
CSN
PROG
ITH
BAT
BOOST
TGATE
SW
INTV
DD
BGATE
SHDN
CHRG
ICL
FVS0
FVS1
T
JMAX
= 125°C,
JA
= 37°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
3
4012fa
LTC4012/
LTC4012-1/LTC4012-2
electrical characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. DCIN = 20V, BAT = 12V, GND = 0V unless otherwise noted. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Charge Voltage Regulation
V
TOL
V
BAT
Accuracy (See Test Circuits) LTC4012
C-Grade
I-Grade
l
l
–0.5
–0.8
–1.0
0.5
0.8
1.0
%
%
%
LTC4012-1/LTC4012-2
C-Grade
FVS1 = 0V, FVS0 = 0V, I-Grade
FVS1 = 0V, FVS1 = 5V, I-Grade
FVS1 = 5V, FVS0 = 0V, I-Grade
FVS1 = 5V, FVS1 = 5V, I-Grade
l
l
l
l
l
–0.6
–0.8
–1.1
–1.15
–1.25
–1.35
0.6
0.8
1.1
1.15
1.25
1.35
%
%
%
%
%
%
I
VFB
V
FB
Input Bias Current V
FB
= 1.2V ±20 nA
R
ON
FBDIV On Resistance I
LOAD
= 100µA
l
85 190
Ω
I
LEAK-FBDIV
FBDIV Output Leakage Current SHDN = 0V, FBDIV = 0V
l
–1 0 1 µA
V
BOV
V
FB
Overvoltage Threshold LTC4012
l
1.235 1.281 1.32 V
BAT Overvoltage Threshold LTC4012-1/LTC4012-2, Relative to
Selected Output Voltage
l
103 106 109 %
Charge Current Regulation
I
TOL
Charge Current Accuracy with R
IN
= 3.01k,
6V < BAT < 18V (LTC4012)
6V < BAT < 15V (LTC4012-1, LTC4012-2)
R
PROG
= 26.7k
C-Grade
I-Grade
l
l
–4
–5
–9.5
4
5
9.5
%
%
%
V
SENSE
= 0mV, PROG = 1.2V –12.75 –11.67 –10.95 µA
A
I
Current Sense Amplifier Gain (PROG ∆I) with
R
IN
= 3.01k, 6V < BAT < 18V (LTC4012)
6V < BAT < 15V (LTC4012-1, LTC4012-2)
V
SENSE
Step from 0mV to 5mV,
PROG = 1.2V
–1.78 –1.66 –1.54 µA
V
CS-MAX
Maximum Peak Current Sense Threshold Voltage
per Cycle (R
IN
= 3.01k)
ITH = 2V, C-Grade
ITH = 2V, I-Grade
ITH = 5V
l
l
l
140
125
195
325
250
265
430
mV
mV
mV
V
C10
C/10 Indicator Threshold Voltage PROG Falling 340 400 460 mV
V
REV
Reverse Current Threshold Voltage PROG Falling 180 253 295 mV
Input Current Regulation
V
CL
Current Limit Threshold CLP – CLN
C-Grade
I-Grade
l
l
97
96
92
100
100
103
104
108
mV
mV
mV
I
CLN
CLN Input Bias Current CLN = CLP ±100 nA
V
ICL
ICL Indicator Threshold (CLP – CLN) – V
CL
–8 –5 –2 mV
CLP Supply
OVR Operating Voltage Range 6 28 V
V
UVLO
CLP Undervoltage Lockout Threshold CLP Increasing
l
4.65 4.85 5.25 V
V
UV(HYST)
UVLO Threshold Hysteresis 200 mV
I
CLPO
CLP Operating Current CLP = 20V, No Gate Loads 2 3 mA
Shutdown
V
ACP
AC Present Threshold Voltage DCIN – BAT, DCIN Rising
C-Grade
I-Grade
l
l
350
300
500
650
700
mV
mV
V
ACP(HYST)
ACP Threshold Hysteresis Voltage 200 mV
V
IL
SHDN Input Voltage Low
l
300 mV
V
IH
SHDN Input Voltage High
l
1.4 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

LTC4012CUF-1#PBF

Mfr. #:
Buy LTC4012CUF-1#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management High Efficiency, Multi-Chemistry Battery Charger
Lifecycle:
New from this manufacturer.
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