LTC4015_15 Datasheet, PDF (9/76 Pages) Linear Technology – Multichemistry Buck Battery Charger Controller with Digital Telemetry System

LTC4015
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), DV_CC = 3.3V, UVCLFB = 1.5; CELLS1 = INTV_CC; EQ,
MPPT, CELLS0, CELLS2, CHEM0, CHEM1 = 0; RT = 95.3k; R_CCREF = 301k, R_NTCBIAS = R_NTC = 10k; BATSENS = CSN = CSP; DRV_CC = INTV_CC;
SYS = CLP = CLN. Conditions: Charging; V_IN = 12V, SYS = 12V, BATSENS = 7.4V …..Battery Only; V_IN = 0V, SYS = 8.4V, BATSENS = 8.4V
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP MAX
UNITS
t_HD(DAT(OUT))
t_HD)DAT(IN))
t_SU(DAT)
t_SP
Output Data Hold Time
Input Data Hold Time
Data Set-Up Time
Input Spike Suppression Pulse Width
0
900
ns
0
ns
100
ns
50
ns
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 LTC4015 is tested under pulsed load conditions such that T_J ≈
T_A. The LTC4015E is guaranteed to meet 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 LTC4015I 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 (PD, in Watts) according to
the formula:
T_J = T_A + (PD • θ_JA)
where θ_JA = 34°C/W for the UHF package.
Note 3: The LTC4015 includes overtemperature protection that is
intended to protect the device during momentary overload conditions.
The maximum rated junction temperature will be exceeded when this
protection is active. Continuous operation above the specified absolute
maximum operating junction temperature may impair device reliability or
permanently damage the device.
Note 4: UVCLFB is internally clamped above the maximum UVCLFB
regulation point (1.6V nominally). Maximum input current must be limited
to 200µA when this clamp is reached.
Note 5: The current limit features of this part are intended to protect the
IC from short term or intermittent fault conditions. Continuous operation
above the maximum specified pin current may result in device degradation
or failure.
Note 6: Measurement error is the magnitude of the difference between the
actual measured value and the ideal value. Error for V_CLP-CLN and V_CSP-CSN
is expressed in μV, a conversion to an equivalent current may be made by
dividing by the sense resistors, R_SNSI and R_SNSB, respectively.
Note 7: V_CHARGE is the battery charge voltage (or CV, constant-voltage)
target. V_BAT is the battery voltage. Dynamic supply current is higher due
to the gate charge being delivered at the switching frequency. See the
Applications Information section.
Note 8: V_IN, or V_BAT for battery only operation, may be connected to any
suitable DC power source from 2.8V to 35V such that the voltage at V_SYS
is high enough to allow INTV_CC to support the desired mode of operation.
In order for the telemetry system to operate, INTV_CC must exceed the
telemetry undervoltage lockout (V_{INTVCC_TUVLO}). In order for the battery
charger to operate, INTV_CC must exceed the charger undervoltage lockout
(V_{INTVCC_CUVLO}). Allowing for 0.3V of drop from V_IN to INTV_CC, these
modes require a minimum input voltage of 3.1V and 4.35V, respectively.
Additionally the V_IN to V_BATSENS (V_{IN_DULVO}) differential must also be
satisfied for charging.
Note 9: Chemistry selection is made using the CHEM1 and CHEM0 pins.
These are three-state pins used by the LTC4015 to select of one of nine
chemistry specific charging algorithms. These pins should be hard wired
to GND(L), INTV_CC(H), or left open (Z > 1000kΩ).
Note 10: I_CHARGE is the battery charge current (or CC, constant-current)
target. I_CHG is the charge current when charging.
Note 11: Charge voltage tolerance is V_CHARGE(TOL) which is specified at the
beginning of the electrical table.
4015f
For more information www.linear.com/LTC4015
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