LTC4020_15 Datasheet, PDF (7/42 Pages) Linear Technology – 55V Buck-Boost Multi-Chemistry Battery Charger

LTC4020
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Ideal Diode V_F vs Battery Voltage
16.0
15.5
15.0
14.5
14.0
13.5
13.0
12.5
12.0
0
5 10 15 20 25 30 35 40 45 50 55
V_BAT (V)
4020 G10
Ideal Diode V_F vs Temperature
24
V_BAT = 20V
22
20
18
16
14
12
10
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
4020 G11
BST Refresh Regulator Dropout
INTV_CC vs I_INTVCC
4.5
PV_IN = 4.5V
4.4
25°C
4.3
4.2
125°C
4.1
4.0
0
10
20
30
40
50
I_INTVCC (mA)
4020 G12
CSOUT vs CSP-CSN
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0
10
20
30
V_(CSP-CSN) (mV)
40
50
4020 G13
Switching Frequency vs Input
Voltage
255
R_RT = 100kΩ
254
253
252
251
250
249
248
247
246
245
0
10 20 30 40 50 60
V_IN (V)
4020 G16
Feedback References vs Input
Voltage
2.80
2.75
VFBMAX
2.70
2.65
2.60
2.55
VFLOAT(CC/CV;ABSORB)
2.50
2.45
2.40
2.35
VFLOAT(LEAD-ACID)
2.30
2.25
5
10 15 20 25 30 35 40 45 50 55
V_IN (V)
4020 G14
Switching Frequency vs
Temperature
255
254
V_IN = 20V
R_RT = 100kΩ
253
252
251
250
249
248
247
246
245
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
4020 G17
For more information www.linear.com/LTC4020
INTV_CC vs V_IN
5.10
5.08
I_INTVCC = 5mA
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
4.90
5
10 15 20 25 30 35 40 45 50 55
V_IN (V)
4020 G15
I_RNG/SS, I_LIMIT, I_NTC, vs
Temperature
52.5
52.0
51.5
51.0
50.5
50.0
49.5
49.0
48.5
48.0
47.5
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
4020 G18
4020fb
7