LTC4050 Datasheet, PDF (3/12 Pages) Linear Technology – Lithium-Ion Linear Battery Charger with Thermistor Interface

LTC4050
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_CC = 6V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
I_C/10
t_TIMER
V_RECHRG
10% Charge Current Indication Level
TIMER Accuracy
Recharge Threshold Voltage
R_PROG = 19.6k, R_SENSE = 0.2Ω
C_TIMER = 0.1µF
V_BAT from High to Low (LTC4050-4.1)
V_BAT from High to Low (LTC4050-4.2)
q 25 50 100
mA
10
%
3.83 3.88
V
3.93 3.98
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LTC4050E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
TYPICAL PERFOR A CE CHARACTERISTICS
Charge Current vs Temperature
540
R_PROG = 19.6k
R_SEN = 0.2Ω
V_BAT = 3V
520 VCC = 6V
500
480
460
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
LTC4050 G01
Trickle Charge Current vs V_CC
70
R_PROG = 19.6k
R_SEN = 0.2Ω
65 V_BAT = 2V
T_A = 25°C
60
55
50
45
40
4
6
8
V_CC (V)
10
LTC4050 G04
Charge Current vs V_CC
520
R_PROG = 19.6k
515 ^RSEN ^{= 0.2Ω}
V_BAT = 3V
510 ^{TA = 25°C}
505
500
495
490
485
480
4
6
8
V_CC (V)
10
LC4050 G02
Trickle Charge Threshold Voltage
vs Temperature
2.51
V_CC = 6V
R_PROG = 19.6k
2.50
2.49
2.48
2.47
2.46
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
LTC4050 G05
Trickle Charge Current
vs Temperature
70
R_PROG = 19.6k
R_SEN = 0.2Ω
65 VBAT = 2V
V_CC = 6V
60
55
50
45
40
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
LTC4050 G03
Trickle Charge Threshold Voltage
vs V_CC
2.55 _{RPROG = 19.6k}
2.54 ^TA ^{= 25°C}
2.53
2.52
2.51
2.50
2.49
2.48
2.47
2.46
2.45
4
6
8
V_CC (V)
10
LTC4050 G06
3