LTC4040_15 Datasheet, PDF (8/26 Pages) Linear Technology – 2.5A Battery Backup Power Manager

LTC4040
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
BBaacckk–-Up Boost Output Voltage
((VV_SSYYSS)) vvss TTeemmppeerraattuurree
5.10
5.00
4.90
4.80
4.70
V_SYS = Set to 5V
4.60
V_BAT = 3.6V
I_SYS = 1mA
4.50
–45
–10 25
60
95 130
TEMPERATURE (°C)
4040 G16
Backup Boost Oscillator
Frequency vs Temperature
1.15
1.10
1.05
1.00
V_BAT = 4.1V
V_BAT = 3.6V
V_BAT = 2.7V
0.95
V_SYS = 5V
0.90
–45
–10 25
60
95 130
TEMPERATURE (°C)
4040 G17
Backup Boost Maximum
Duty Cycle vs Temperature
90
V_BAT = 3.6V
88
86
84
82
80
–45
–10 25
60
95 130
TEMPERATURE (°C)
4040 G18
Backup Boost Effificiency
vs Load Current
100
90
80
70
60
50
40
30
V_SYS SET TO 5V
20
V_BAT = 3.2V
10
V_BAT = 3.7V
V_BAT = 4.1V
0
1
10
100
1k 3k
LOAD CURRENT (mA)
4040 G19
Backup Boost NMOS RO_Dn_S-R_(Oe_Ns₎istance
vs V_SYS over Temperature
110
100
130°C
90
90°C
80
60°C
70
25°C
60
–10°C
–45°C
50
3.5
3.8
4.1
4.4
4.7
5.0
V_SYS (V)
4040 G20
BBaacckkuupp BBoooosstt PPMMOOSS RO_Dn_S-₍R_Oe_Ns₎istance
vvss VV_SSYYSS oovveerr TTeemmppeerraattuurree
110
130°C
100
90°C
90
60°C
80
25°C
–10°C
70
–45°C
60
50
3.5
3.8
4.1
4.4
4.7
5.0
V_SYS (V)
4040 G21
SLEEP Mode (Backup)
I_BATQ vs Temperature
45
40
35
30
25
–45
V_BAT = 4.1V
V_BAT = 3.6V
V_BAT = 2.7V
–10 25
60
95 130
TEMPERATURE (°C)
4040 G22
4040fa
8
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