Document
LTC4013
60V Synchronous Buck Multi-Chemistry Battery Charger
FEATURES
n Wide Input Voltage Range: 4.5V to 60V n Wide Battery Voltage Range: 2.4V to 60V n Built-In Charge Algorithms for Lead-Acid and Li-Ion n ±0.5% Float Voltage Accuracy n ±5% Charge Current Accuracy n Maximum Power Point Tracking Input Control n NTC Temperature Compensated Float Voltage n Two Open Drain Status Pins n Thermally Enhanced 28-Lead 4mm × 5mm QFN
Package
APPLICATIONS
n Battery Backup for Lighting, UPS Systems, Security Cameras, Computer Control Panels
n Portable Medical Equipment n Solar-Powered Systems n Industrial Battery Charging
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.
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 LiFePO4 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-compensated charge voltage and an external N-channel MOSFET isolation control circuit.
TYPICAL APPLICATION
15V-34V to 6 Cell Lead-Acid (12.6V) 5A Step-Down Battery Charger
15V-34V
INFET VIN_S DCIN
ENAB
MPPT
VIN BST TG SW BG
FBOC
LTC4013
INTVCC PGND SENSE
INTVCC
MODE1
BAT
MODE2 FB
SYNC
NTC
RT TMR LB
SGND ITH
INTVCC RNTC
Efficiency and Power Loss vs Charge Current
EFFICIENCY (%)
POWER LOSS (W)
97
2.5
96
EFFICIENCY
95
2.0
94
POWER LOSS
93
1.5
92
91
1.0
90
89
VIN = 24V
0.5
88
VBAT = 13.8V
87 0
0
1
2
3
4
5
CHARGE CURRENT (A)
4013 TA01a
BASED ON APPLICATION ON BACK PAGE
Document Feedback
4013 TA01
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Rev B
1
LTC4013
ABSOLUTE MAXIMUM RATINGS
(Note 1)
DCIN, VIN, 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,
INTVCC, 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
PIN CONFIGURATION
TOP VIEW
VIN_S VIN PGND INTVCC BG SW
28 27 26 25 24 23
INFET 1
22 TG
DCIN 2
21 BST
MPPT 3
20 SENSE
FBOC 4 ENAB 5
29 SGND
19 BAT 18 FB
ISMON 6
17 NTC
STAT0 7
16 ITH
STAT1 8
15 RT
9 10 11 12 13 14
LB TMR MODE1 MODE2 CLKOUT SYNC
UFD PACKAGE 28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 3.4°C/W EXPOSED PAD (PIN 29) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4013EUFD#PBF
LTC4013EUFD#TRPBF 4013
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC4013IUFD#PBF
LTC4013IUFD#TRPBF 4013
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
Contact the factory for parts specified with wider operating temperature ranges.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev B
2
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LTC4013
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). DCIN, VIN, VIN_S = 18V, ENAB = 1.4V, SYNC = 0V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range (DCIN, VIN)
l 4.5
60
V
Battery Voltage Range (BAT)
l 2.4
60
V
ENAB Pin Threshold (Rising) Threshold Hysteresis
l 1.175 1.220 1.275
V
170
mV
ENAB Pin Bias Current
10
nA
VIN UVLO
VIN Rising, Power Enabled VIN Rising, Power Disabled
3.45
V
3.08
V
DCIN Pin Operating Current Shutdown Current
Not Switching ENAB = 0V
480
625
µA
l
4
7.9
µA
VIN Pin
Operating Current Shutdown Current
Not Switching (Notes 3 and 4) ENAB = 0V, RT = 40.2k
2.1
2.8
mA
l
32
80
µA
BAT Pin Shutdown Current
ENAB = 0V
l
0.5
1.