LTC4011_15 Datasheet, PDF (3/26 Pages) Linear Technology – High Efficiency Standalone Nickel Battery Charger

LTC4011
Electrical Characteristics The l indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC = 12V, BAT = 4.8V, GND = PGND = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
Thermistor Termination
V_RT
Output Voltage
R_L = 10k
3.075
3.3
3.525
V
l
3
3.6
V
I_RT
Short-Circuit Current
V_RT = 0V
l
–9
–1
mA
PWM Current Source
V_FS
BAT – SENSE Full-Scale Regulation
Voltage (Fast Charge)
0.3V < BAT < V_CC – 0.3V (Note 5)
BAT = 4.8V
95
l
95
100
105
mV
100
105
mV
V_PC
BAT – SENSE Precharge Regulation Voltage 0.3V < BAT < V_CC – 0.3V (Note 5)
16
20
24
mV
BAT = 4.8V
l
16
20
24
mV
V_TC
BAT – SENSE Top-Off Charge
Regulation Voltage
0.3V < BAT < V_CC – 0.3V (Note 5)
BAT = 4.8V
6.5
l
6.5
10
13.5
mV
10
13.5
mV
∆V_LI
I_BAT
I_SENSE
I_OFF
f_TYP
f_MIN
DC_MAX
V_OL(TG)
V_OH(TG)
t_R(TG)
t_F(TG)
V_OL(BG)
V_OH(BG)
t_R(BG)
t_F(BG)
BAT – SENSE Line Regulation
BAT Input Bias Current
SENSE Input Bias Current
Input Bias Current
Typical Switching Frequency
Minimum Switching Frequency
Maximum Duty Cycle
TGATE Output Voltage Low
(V_CC – TGATE, Note 7)
TGATE Output Voltage High
TGATE Rise Time
TGATE Fall Time
BGATE Output Voltage Low
BGATE Output Voltage High
BGATE Rise Time
BGATE Fall Time
5.5V < V_CC < 25V, Fast Charge
0.3V < BAT < V_CC – 0.1V
SENSE = BAT
SENSE or BAT, V_CELL = 0V
V_CC > 9V, No Load
V_CC < 7V, No Load
V_CC – TGATE, No Load
C_LOAD = 3nF, 10% to 90%
C_LOAD = 3nF, 10% to 90%
No Load
No Load
C_LOAD = 1.6nF, 10% to 90%
C_LOAD = 1.6nF, 10% to 90%
±0.3
mV
–2
2
mA
50
150
µA
l
–1
0
1
µA
l
460
550
640
kHz
l
20
30
kHz
98
99
%
l
5
5.6
8.75
V
l V_CC – 0.5
V_CC
V
l
0
50
mV
35
100
ns
45
100
ns
l
0
50
mV
l INTV_DD – 0.075 INTV_DD
V
35
80
ns
15
80
ns
ADC Inputs
I_LEAK
Analog Channel Leakage
0V < V_CELL < 2V, 550mV < V_TEMP < 2V
±100
nA
Charger Thresholds
V_BP
V_BOV
V_MFC
V_FCBF
∆V_TERM
Battery Present Threshold Voltage
Battery Overvoltage
Minimum Fast Charge Voltage
Fast Charge Battery Fault Voltage
–∆V Termination
CHEM OPEN (NiCd)
CHEM = 0V (NiMH)
l
320
350
370
mV
l 1.815
1.95
2.085
V
l
850
900
950
mV
l 1.17
1.22
1.27
V
l
16
20
25
mV
l
6
10
14
mV
V_AR
∆T_TERM
Automatic Recharge Voltage
∆T Termination (Note 8)
V_CELL Decreasing
CHEM = 3.3V (NiCd)
CHEM = 0V (NiMH)
l 1.260
l
1.3
l
0.5
1.325
2
1
1.390
2.7
1.5
V
°C/min
°C/min
T_MIN
Minimum Charging Temperature (Note 8) V_TEMP Increasing
l
0
5
9
°C
T_MAXI
Maximum Charge Initiation
Temperature (Note 8)
V_TEMP Decreasing, Not Charging
l 41.5
45
47
°C
4011fb