LTC4000-1 Datasheet, PDF (1/40 Pages) Linear Technology – High Voltage High Current Controller for Battery Charging with Maximum Power Point Control

LTC4000-1
High Voltage High Current
Controller for Battery Charging with
Maximum Power Point Control
Features
Description
n _{Maximum Power Control: Solar Panel Input}
Compatible
n _{Complete High Performance Battery Charger When}
Paired with a DC/DC Converter
n _{Wide Input and Output Voltage Range: 3V to 60V}
n _{Input Ideal Diode for Low Loss Reverse Blocking}
and Load Sharing
n _{Output Ideal Diode for Low Loss PowerPath™ and}
Load Sharing with the Battery
n _{Programmable Charge Current: ±1% Accuracy}
n _{±0.25% Accurate Programmable Float Voltage}
n _{Programmable C/X or Timer Based Charge}
Termination
n _{NTC Input for Temperature Qualified Charging}
n _{28-Lead 4mm × 5mm QFN or SSOP Packages}
Applications
n _{Solar Powered Battery Charger Systems}
n _{Battery Charger with High Impedance Input Source,}
e.g., Fuel Cell or Wind Turbine
n _{Battery Equipped Industrial or Portable Military}
Equipments
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.
The LTC^®4000-1 is a high voltage, high performance
controller that converts many externally compensated
DC/DC power supplies into full-featured battery chargers
with maximum power point control. In contrast to the
LTC4000, the LTC4000-1 has an input voltage regulation
loop instead of the input current regulation loop.
Features of the LTC4000-1’s battery charger include:
accurate (±0.25%) programmable float voltage, select-
able timer or current termination, temperature qualified
charging using an NTC thermistor, automatic recharge,
C/10 trickle charge for deeply discharged cells, bad battery
detection and status indicator outputs. The battery charger
also includes precision current sensing that allows lower
sense voltages for high current applications.
The LTC4000-1 supports intelligent PowerPath control. An
external PFET provides low loss reverse current protec-
tion. Another external PFET provides low loss charging
or discharging of the battery. This second PFET also
facilitates an instant-on feature that provides immediate
downstream system power even when connected to a
heavily discharged or shorted battery.
The LTC4000-1 is available in a low profile 28-lead
4mm × 5mm QFN and SSOP packages.
Typical Application
10.8V at 10A Charger for Three LiFePO₄ Cells with a Solar Panel Input
SOLAR PANEL INPUT
<60V OPEN
CIRCUIT VOLTAGE
17.6V PEAK
POWER VOLTAGE
5mΩ
332k
20k
LT3845A
IN
OUT
V_C
100µF
Si7135DP
CLN
IN
1µF
IFB
3V
14.7k
47nF
ITH
CC
IID IGATE CSP
CSN
BGATE
BAT
OFB
LTC4000-1
FBG
BFB
NTC
V_OUT
12V, 15A
1.15M 5mΩ
Si7135DP
127k
133k
1.13M
V_BAT
10.8V FLOAT
10A MAX CHARGE
CURRENT
IIMON TMR
CL
CX
GND BIAS
10k
10k
10nF
24.9k 22.1k
0.1µF
1µF
3-CELL LiFePO₄
BATTERY PACK
40001 TA01a
Solar Panel Input Regulation,
Achieves Max Power Point
to Greater than 98%
20
T_A = 25°C
18
16
14
98% TO 95% PEAK POWER
12
100% TO 98% PEAK POWER
10
1
2 3 4 5 6 7 8 9 10
CHARGER OUTPUT CURRENT: I_RCS (A)
40001 TA01b
40001f
1