LTC4013
60V Synchronous Buck
Multi-Chemistry Battery Charger
FEATURES
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DESCRIPTION
The
LTC
®
4013
is a high voltage battery charger that is well
suited for charging a wide range of lead-acid batteries
including both vented and sealed types. It supports bulk,
float, absorption and equalization charging. The LTC4013
also supports termination options for Li-Ion/Polymer and
LiFePO
4
batteries.
Charging is performed with a high efficiency synchronous
buck (step-down) converter that uses external N-channel
MOSFETs. Switching frequency is resistor programmable
or can be synchronized to an external clock. Charge current
is programmed with an external sense resistor.
The LTC4013 also includes maximum power point tracking
input-voltage regulation for limited power sources such as
solar panels. Other features include user-programmable
absorption and equalization times, temperature-compen-
sated charge voltage and an external N-channel MOSFET
isolation control circuit.
Wide Input Voltage Range: 4.5V to 60V
Wide Battery Voltage Range: 2.4V to 60V
Built-In Charge Algorithms for Lead-Acid and Li-Ion
±0.5% Float Voltage Accuracy
±5% Charge Current Accuracy
Maximum Power Point Tracking Input Control
NTC Temperature Compensated Float Voltage
Two Open Drain Status Pins
Thermally Enhanced 28-Lead 4mm
×
5mm QFN
Package
Battery Backup for Lighting, UPS Systems, Security
Cameras, Computer Control Panels
Portable Medical Equipment
Solar-Powered Systems
Industrial Battery Charging
APPLICATIONS
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All registered trademarks and trademarks are the property of their respective owners. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
9246383.
TYPICAL APPLICATION
15V-34V to 6 Cell Lead-Acid (12.6V) 5A Step-Down Battery Charger
15V-34V
Efficiency and Power Loss vs Charge Current
97
96
95
EFFICIENCY
2.0
POWER LOSS
1.5
POWER LOSS (W)
2.5
DCIN
ENAB
MPPT
FBOC
LTC4013
BST
TG
SW
BG
EFFICIENCY (%)
INFET VIN_S
V
IN
94
93
92
91
90
89
1.0
INTV
CC
PGND
SENSE
88
87
0
1
V
IN
= 24V
V
BAT
= 13.8V
2
3
4
CHARGE CURRENT (A)
5
4013 TA01a
0.5
0
BASED ON APPLICATION ON BACK PAGE
INTV
CC
MODE1
MODE2
SYNC
NTC
RNTC
BAT
FB
INTV
CC
RT
TMR
LB
SGND
ITH
4013 TA01
4013fa
1
LTC4013
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
INTVCC
VIN_S
PGND
SW
22 TG
21 BST
20 SENSE
29
SGND
19 BAT
18 FB
17 NTC
16 ITH
15 RT
9 10 11 12 13 14
TMR
MODE1
LB
MODE2
CLKOUT
SYNC
V
IN
BG
DCIN, V
IN
, VIN_S, ENAB, STAT0, STAT1 .... –0.3V to 60V
INFET ......................................................... –0.3V to 73V
BST ........................................................... –0.3V to 66V
STAT0, STAT1 ..........................................................5mA
SENSE, BAT ............................................... –0.3V to 60V
SENSE-BAT ............................................... –0.3V to 0.3V
FBOC, MPPT, FB, MODE1, MODE2, SYNC,
INTV
CC
, NTC ............................................ –0.3V to 6V
TMR, LB, ITH ............................................... –0.3V to 3V
Operating Junction Temperature Range
(Note 2) ............................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
28 27 26 25 24 23
INFET 1
DCIN 2
MPPT 3
FBOC 4
ENAB 5
ISMON 6
STAT0 7
STAT1 8
UFD PACKAGE
28-LEAD (4mm
×
5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 43°C/W,
θ
JC
= 3.4°C/W
EXPOSED PAD (PIN 29) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC4013EUFD#PBF
LTC4013IUFD#PBF
TAPE AND REEL
LTC4013EUFD#TRPBF
LTC4013IUFD#TRPBF
http://www.linear.com/product/LTC4013#orderinfo
PART MARKING
4013
4013
PACKAGE DESCRIPTION
28-Lead (4mm
×
5mm) Plastic QFN
28-Lead (4mm
×
5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
2
4013fa
LTC4013
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). DCIN, V
IN
, VIN_S = 18V, ENAB = 1.4V, SYNC = 0V
unless otherwise noted.
PARAMETER
Input Voltage Range (DCIN, V
IN
)
Battery Voltage Range (BAT)
ENAB Pin Threshold (Rising)
Threshold Hysteresis
ENAB Pin Bias Current
V
IN
UVLO
DCIN Pin
V
IN
Pin
BAT Pin
SENSE Pin
Operating Current
Shutdown Current
Operating Current
Shutdown Current
Operating Current
Shutdown Current
Operating Current
Shutdown Current
V
IN
Rising, Power Enabled
V
IN
Rising, Power Disabled
Not Switching
ENAB = 0V
Not Switching (Notes 3 and 4)
ENAB = 0V, RT = 40.2k
Not Switching
ENAB = 0V
Not Switching
ENAB = 0V
ENAB = 0V, SW = 60V, BST = 66V
STAT0, STAT1 Pin Current =1mA
STAT0, STAT1 Pin Current = 5mA
STAT0, STAT1 Pin Voltage = 60V
MODE1 = L, H MODE2 = L, H
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ELECTRICAL CHARACTERISTICS
CONDITIONS
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MIN
4.5
2.4
1.175
TYP
MAX
60
60
UNITS
V
V
V
mV
nA
V
V
1.220
170
10
3.45
3.08
480
4
2.1
32
6.2
0.5
5.3
0.4
0.25
0.14
0.77
1.275
625
7.9
2.8
80
9.3
1.5
8.1
2.5
0.2
1.0
1
µA
µA
mA
µA
µA
µA
µA
µA
µA
V
V
µA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V/V
mV
nA
μA
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SW Pin Current in Shutdown
STAT0, STAT1 Enabled Voltage
STAT0, STAT1 Leakage Current
FB Regulation Voltage (See Tables 2-5)
Battery Float Voltage V
FB(FL)
2.256
2.244
2.189
2.178
2.320
2.309
2.355
2.343
2.388
2.376
2.487
2.475
2.587
2.574
2.355
2.343
2.388
2.376
2.284
2.272
–15
19.6
2.267
2.267
2.200
2.200
2.332
2.332
2.367
2.367
2.400
2.400
2.500
2.500
2.600
2.600
2.367
2.367
2.400
2.400
2.295
2.295
0.21
0
10
20
2.278
2.291
2.211
2.223
2.344
2.356
2.380
2.392
2.412
2.425
2.513
2.526
2.613
2.627
2.38
2.392
2.412
2.425
2.306
2.319
15
20.4
MODE1 = M, MODE2 = L, H
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MODE1 = L, MODE2 = M
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Battery Absorption Voltage V
FB(ABS)
MODE1 = H, MODE2 = L, H
MODE1 = L, MODE2 = H
MODE1 = M, MODE2 = L, H
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Battery Equalization Voltage V
FB(EQ)
MODE1 = L, H, MODE2 = H, TMR = Cap
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MODE1 = M, MODE2 = H, TMR = Cap
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Battery Charge Voltage V
FB(CHG)
MODE1 = H, MODE2 = M
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MODE1 = M, MODE2 = M
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Battery Recharge Voltage V
FB(RECHG)
NTC Amplifier Gain
NTC Amplifier Offset
FB Pin Current
LB Pin Current
MODE1 = M, H MODE2 = M
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∆V
FB(FL)
/∆V
NTC
∆V
FB(FL)
with V
NTC
= INTV
CC
/2
V
FB
= 3V
V
LB
= 2V
3
LTC4013
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). DCIN, V
IN
, VIN_S = 18V, ENAB = 1.4V, SYNC = 0V
unless otherwise noted.
PARAMETER
Error Amp
Error Amp Transconductance
Error Amp Current Source
Error Amp Current Sink
Maximum Charging Sense Resistor Voltage
Equalization and Low Battery Charging Sense
Resistor Voltage
Current Sense C/10 Threshold
Constant Voltage (CV) Threshold
Overcurrent Charging Turnoff
ISMON Fullscale Output Voltage
SENSE Input UVLO
SENSE Input UVLO Hysteresis
Configuration Pins
MODE1, MODE2 Pin, Low Threshold
MODE1, MODE2 Pin, Mid Threshold
MODE1, MODE2 Pin, High Threshold
Timer
TMR Oscillator High Threshold
TMR Oscillator Low Threshold
Safety Timer Turn on Voltage
Safety Timer Turn on Hysteresis Voltage
TMR Source/Sink Current
TMR Pin Period
End of Charge Termination Time, t
EOC
Equalization Charge Termination Time
INTV
CC
Regulator (INTV
CC
Pin)
INTV
CC
Regulation Voltage
INTV
CC
Dropout Voltage
INTV
CC
Supply Short-Circuit Current
NMOS FET Drivers
Non-Overlap Time TG to BG
Non-Overlap Time BG to TG
Minimum On-Time BG
Minimum On-Time TG
Minimum Off-Time BG
Top Gate Driver Switch On Resistance
Bottom Gate Driver Switch On Resistance
BST – SW = 5V, Pull Up
BST – SW = 5V, Pull Down
INTV
CC
= 5V, Pull Up
INTV
CC
= 5V, Pull Down
40
74
38
37
65
2.3
1.3
2.3
1
ns
ns
ns
ns
ns
Ω
Ω
Ω
Ω
4013fa
ELECTRICAL CHARACTERISTICS
CONDITIONS
∆I
ITH
/∆(V
SENSE
–V
BAT
) V
ITH
= 1.8V
V
ITH
=1.8V, V
FB
= 2.0V, (Float) MODE1 = H, MODE2 = L
V
ITH
=1.8V, V
FB
= 2.4V, (Float) MODE1 = H, MODE2 = L
In Absorption, Float, Li-Ion Charge, BAT = 14V
BAT = 14V
Termination when TMR = 0
V
FB(ABS,EQ)
– V
FB
, Timeout Initiation with Cap on TMR
V
SENSE
– V
BAT
= 50mV
V
SENSE
Rising (Charging Enabled)
V
SENSE
Rising to Falling (Charging Disabled)
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MIN
1300
–6.5
18
48
8
2.0
TYP
1800
–10
27
50
10
4.6
15.6
100
1.00
MAX
2300
–13.5
35
52
12.5
7.0
24.5
106
2.07
UNITS
µmho
µA
µA
mV
mV
mV
mV
mV
V
V
mV
Current Sense (all measured as V
SENSE
– V
BAT
unless otherwise noted)
1.86
1.97
100
0.8
1.3
2.5
1.5
0.97
1.8
V
V
V
V
V
TMR Voltage Rising
TMR = 1.25V
CTMR = 0.2µF
CTMR = 0.2µF
CTMR = 0.2µF, MODE1 = M, H
CTMR = 0.2µF, MODE1 = L
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0.45
8.5
0.5
250
10.0
20.8
3.03
0.379
0.758
5.00
0.65
11.5
V
mV
μA
ms
hr
hr
hr
V
V
mA
DCIN = 4.5V, INTV
CC
= 5mA
INTV
CC
= 0V
100
4.46
175
4
LTC4013
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). DCIN, V
IN
, VIN_S = 18V, ENAB = 1.4V, SYNC = 0V,
unless otherwise noted.
PARAMETER
BST UVLO
OSC
Switching Frequency
SYNC Pin Threshold (Falling Edge)
SYNC Pin Hysteresis
CLK Output Logic Level
Input PowerPath Control
Reverse Turn-Off Threshold Voltage
Forward Turn-On Threshold Voltage
Forward Turn-On Hysteresis Voltage
INFET Turn-Off Current
INFET Turn-On Current
INFET Clamp Voltage
DCIN – V
IN
DCIN – V
IN
DCIN – V
IN
INFET = V
IN
+ 1.5V
INFET = V
IN
+ 1.5V
I
INFET
= 2μA , DCIN = 12V to 60V
V
IN
= DCIN – 0.1V
Measure VINFET – DCIN
I
INFET
= –2μA , DCIN = 12V to 59.9V
V
IN
= DCIN +0.1V
Measure VINFET – DCIN
Switching Regulator Turn Off (V
DCIN
– V
BAT
Falling)
Switching Regulator Turn On (V
DCIN
– V
BAT
Rising)
MPPT Regulation
FBOC Voltage Range
MPPT Sample Period
MPPT Sample Pulse Width
Regulation Input Offset
MPPT Input Burst Mode Turn On Threshold
MPPT Input Burst Mode Hysteresis
Set FBOC Look at MPPT Regulation
V
MPPT
– V
FBOC
(Converted) , V
FBOC
= 1.5V
V
SENSE
– V
BAT
< C/10 Part Enter Burst Mode
FBOC = 1.5V, V
SENSE
– V
BAT
< C/10
MPPT Turn Off – Turn On
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ELECTRICAL CHARACTERISTICS
CONDITIONS
TG Enabled (Rising)
TG Disabled (Falling)
R
T
= 40.2kΩ
R
T
= 232kΩ
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MIN
TYP
4.25
3.81
MAX
UNITS
V
V
950
1.3
1000
200
1.4
190
1050
1.5
kHz
kHz
V
mV
V
V
mV
mV
mV
mA
µA
High
Low
4.5
0.5
–4.4
–4.2
0.2
–9.0
60
11.0
12.5
–1.3
–1.1
–7.3
–7.1
V
INFET Off Voltage
l
–2.2
–1.6
V
DCIN to BAT UVLO
69
99
1.0
10.2
271
–40
–45
35
–32
62
40
–15
85
3.0
mV
mV
V
s
µs
mV
mV
mV
Note 1.
Stresses beyond those listed under Absolute Maximum Ratings may
cause permanent damage to the device. Exposure to any Absolute Maximum
Rating condition for extended periods may affect device reliability and lifetime.
Note 2.
The LTC4013 is tested under pulse loaded conditions such that
T
J
≈ T
A
. The LTC4013E is guaranteed to meet performance specifications
from 0°C to 85°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC4013I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The junction temperature (T
J
in °C) is calculated
from the ambient temperature (T
A
in °C) and power dissipation (P
D
in
Watts) according to the formula: T
J
= T
A
+ P
D
• θ
JA
where
θ
JA
(in °C/W)
is the package thermal impedance. Note that the maximum ambient
temperature consistent with these specifications is determined by specific
operating conditions in conjunction with board layout, the rated package
thermal resistance and other environmental factors. This IC includes
over temperature protection that is intended to protect the device during
momentary overload. Junction temperature will exceed 125°C when over
temperature protection is active. Continuous operation above the specified
maximum operating junction temperature may impair device reliability.
Note 3.
V
IN
does not include switching currents.
Note 4.
I
VIN
current also includes current that charges capacitance on
CLKOUT. This current is approximately C
CLKOUT
• 5V • f
SW
. For this test
C
CLKOUT
was 100pF, f
SW
was 1MHz (R
T
= 40.2k) so the current included is
0.5mA. In normal operation the CLKOUT capacitance is much less.
4013fa
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