LTC3305_15 Datasheet, PDF (4/28 Pages) Linear Technology – Lead-Acid Battery Balancer

LTC3305
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C. (Note 2) V1 = 13.2V, V2 = 26.4V, V3 = 39.6V, V4 = 52.8V,
AUXP - AUXN = 13.2V, R_ISET = 12.1kΩ
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
PTC Fault Threshold
Hysteresis
|BAT-AUXP| Falling
0.8
1
1.2
V
100
mV
V_TERMINATE
|BAT-AUXP| for Which Balancing Is Terminated TERM2 = 0, TERM1 = 0
TERM2 = 0, TERM1 = 1
TERM2 = 1, TERM1 = 0
TERM2 = 1, TERM1 = 1
l 5.0
12.5 20.0
mV
l 17.5
25
32.5
mV
l 40
50
60
mV
l 85
100
115
mV
Minimum (BOOST-V4) Voltage for Operation
l 6.7
6.95
7.2
V
Hysteresis
180
mV
Maximum (BOOST-V4) Voltage Regulated
l
8.45 8.75
V
Hysteresis
200
mV
R_NMOS
R_PMOS
t_BAT
Charge Pump NMOS Switch ON Resistance
Charge Pump PMOS Switch ON Resistance
Maximum Time a Single Battery Stays
Connected to the Auxiliary Battery
Measured at 10mA
Measured at 10mA
CTBAT = 10nF
20
Ω
55
Ω
4.5
5
5.5
sec
t_ON
Maximum Stack Balancing Termination Time MODE = 0, CTON = 10nF
0.43 0.48 0.53
hrs
t_OFF
Off Time After Stack Balance Termination
MODE = 0, DONE = 0, CTOFF = 10nF
0.43 0.48 0.53
hrs
V_IH
Digital Input High Voltage
EN1, EN2, MODE, TERM1, TERM2 Pins
l 1.2
V
V_IL
Digital Input Low Voltage
EN1, EN2, MODE, TERM1, TERM2 Pins
l
0.4
V
I_IH, I_IL
Leakage Current
EN1, EN2, MODE, TERM1, TERM2 Pins; l –1
2.5V at Pin
1
µA
V_OL
Output Low Voltage
BATX, BATY, BAL, DONE,
l
UVFLT, OVFLT, PTCFLT Pins; 3mA Into Pin
27.5 150
mV
I_OH
Output High Leakage Current
BATX, BATY, BAL, DONE,
UVFLT, OVFLT, PTCFLT Pins; 6V at Pin
1
µA
Thermal Shutdown Threshold (Note 7)
Rising Temperature
155
°C
Thermal Shutdown Hysteresis
10
°C
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 LTC3305 is tested under pulsed load conditions such that T_J
≈ T_A. The LTC3305E is guaranteed to meet specifications from 0ºC to 85ºC
junction temperature. Specifications over the –40ºC to 125ºC operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3305I is guaranteed
over the –40°C to 125°C operating junction temperature range. 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 impedance, and other environmental
factors. 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 3. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.
Note 4. The NGATE pin currents are not included in this number.
Note 5. The NGATE5_, NGATE6, NGATE7 pin currents are drawn from the
BOOST pin. All other NGATE pin currents are drawn from the V4 pin. The
NGATE pin currents add to the currents drawn by V4 and BOOST.
Note 6. The voltage programmed at the V_H and V_L pins are gained up to
set the undervoltage and overvoltage thresholds of each battery.
Note 7: This IC includes overtemperature protection intended to protect
the device during momentary overload conditions. The maximum junction
temperature may be exceeded when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may result in device degradation or failure.
3305f
4
For more information www.linear.com/LTC3305