The LTC ® 4000 is a high voltage controller and power manager which, when paired with a DC/DC converter, becomes a full- featured battery charger solution. The LTC4000 is capable of driving virtually any topology, including buck, boost, buck- boost, SEPIC and flyback converters. Its intelligent PowerPath manager provides power to the system load when input power is available, enabling instant-on operation even with a deeply discharged battery. A full-featured controller, the LTC4000 can charge a variety of battery types including lithium, nickel and lead acid-based chemistries. Highly accurate charge current and float voltage, as well as onboard termination, ensure safe and accurate charging. Features n Input/Output Voltage: 3V to 60V n Charge Currents up to 20A+ n Input Ideal Diode for Low Loss Reverse Blocking and Load Sharing n Programmable Input and Charge Current: ±1% Accuracy n ±0.2% Accurate Programmable Float Voltage n Programmable C/X or Timer-Based Charge Termination n NTC Input for Temperature-Qualified Charging Complete Solution: PowerPath ™ Control & Termination, No Software 60V, 20A+ Battery Charging Controller TIME (HR:MIN:SEC) 0:0:00 34 BATTERY VOLTAGE (V) 37 40 43 46 0:30:00 1:00:00 1:30:00 49 52 –0.5 CHARGE CURRENT (A) 0.0 0.5 1.0 1.5 2.0 2.5 0:15:00 0:45:00 1:15:00 V BAT I BAT 12S 2.2Ah Li-lon Charge Curves LTC4000 ITH BAT IGATE BGATE GND Buck Boost Buck-Boost SEPIC Flyback V IN 3V to 60V System I = Up to 20A+ Status Multicell Battery Stack Turns Any Switching Regulator Into a Charger DC/DC Converter CHRG VM L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
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The LTC®4000 is a high voltage controller and power manager which, when paired with a DC/DC converter, becomes a full-featured battery charger solution. The LTC4000 is capable of driving virtually any topology, including buck, boost, buck-boost, SEPIC and flyback converters. Its intelligent PowerPath manager provides power to the system load when input power is available, enabling instant-on operation even with a deeply discharged battery. A full-featured controller, the LTC4000 can charge a variety of battery types including lithium, nickel and lead acid-based chemistries. Highly accurate charge current and float voltage, as well as onboard termination, ensure safe and accurate charging.
Featuresn Input/Output Voltage: 3V to 60Vn Charge Currents up to 20A+n Input Ideal Diode for Low Loss Reverse
Blocking and Load Sharingn Programmable Input and Charge Current:
±1% Accuracyn ±0.2% Accurate Programmable Float Voltagen Programmable C/X or Timer-Based Charge
Terminationn NTC Input for Temperature-Qualified Charging
Complete Solution: PowerPath™ Control & Termination, No Software
60V, 20A+Battery Charging Controller
TIME (HR:MIN:SEC)
0:0:0034
BATT
ERY
VOLT
AGE
(V)
37
40
43
46
0:30:00 1:00:00 1:30:00
49
52
–0.5
CHARGE CURRENT (A)
0.0
0.5
1.0
1.5
2.0
2.5
0:15:00 0:45:00 1:15:00
VBAT
IBAT
12S 2.2Ah Li-lon Charge Curves
LTC4000
ITH
BAT
IGATE
BGATE
GND
Buck
Boost
Buck-Boost
SEPIC
FlybackVIN
3V to 60VSystem
I = Up to 20A+Status
MulticellBattery Stack
Turns AnySwitching Regulator
Into a Charger
DC/DC Converter
CHRG
VM
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
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15V to 60V Buck 10A Charger for 3-Cell LiFePO4
18V to 72V Flyback 2A Charger for 1-Cell Li-Ion
12V to 21V Boost 10A Charger for 24V Lead Acid
6V to 36V Buck-Boost 5A Charger for 4-Cell LiFePO4
BUCKCONTROLLER
VIN
VOUT
BAT
ITH
CLN
CL TMR CX GND BIAS
IN
CC IID IGATE CSP
CSN
BGATE
OFB
FBG
BFB
LTC4000
BOOSTCONTROLLER
VIN VOUT
BAT
ITH
CLN
CL TMR CX GND BIAS
IN
CC IID IGATECSP
CSN
BGATE
OFB
FBG
BFB
LTC4000
VIN VOUT
BAT
ITH
CLN
CL TMR CX GND BIAS
IN
CC IID IGATECSP
CSN
BGATE
OFB
FBG
BFB
LTC4000
BUCK BOOSTCONTROLLER
•
•VIN
VCC
VCC
BAT
VSYS
ITH
CL TMR CX GND BIAS
CC
CSP
CSN
BGATE
OFB
FBG
BFB
LTC4000
FLYBACKCONTROLLER
VOUT
VOUT CLN IID IGATEIN
LTC4000 Pairings Verified in Linear Technology’s LabIC Topology Input Voltage Range Output Voltage/Current Battery
LTC3789 Buck-Boost 5 – 36V 14.4V/10A 4S LiFePO4LTC3789 Buck-Boost 9 – 30V 16.8V/5A 4S Li-Ion
LTC3851A Buck 5 – 38V ~4V/12A 4V Lead Acid
LT3845A Buck 15 – 60V 10.8V/10A 3S LiFePO4LT3845A Buck 36 – 48V 29.4V/2A 7S Li-Ion
LT3845A Buck 5 – 38V ~4V/12A 4V Lead Acid
LTC3787 Boost 12 – 21V ~30V/10A 24V Lead Acid
LTC3862 Boost 10 – 20V ~55V/4A 48V Lead Acid
LTC3862 Boost 19 – 24V 42.5V/53.5V/5A 11/13S Li-Ion
LT1952-1 Forward 36 – 72V 53.5V/2A 48V Lead Acid
LTC3805 Flyback 18 – 72V 4.2V/2A 1S Li-Ion
NCP1230A Flyback 110 – 220Vac 14.4V/0.3A 4S LiFePO4
LTC4000 – Compatible with Virtually Any Linear Technology Switching Regulator
0911
www.linear.com/4000 n 1-800-4-LINEAR
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