LTC4040_15 Datasheet, PDF (6/26 Pages) Linear Technology – 2.5A Battery Backup Power Manager

LTC4040
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
I_BBAATT vs V_BBAATT (Li-–IIoonn))wwiitthhDifferent
CDhifafergrenVtoClhtaagregeSVetotlitnaggse Settings
1000
800
V_SYS = 5V
R_PROG = 2k
600
400
200
0
2.7
F2 = 1, F1 = 0, F0 = 0
F2 = 1, F1 = 0, F0 = 1
F2 = 1, F1 = 1, F0 = 0
F2 = 1, F1 = 1, F0 = 1
3
3.3
3.6
3.9
4.2
V_BAT (V)
4040 G01
I_BAT vs V_BAT (LiFePO₄) with
Different Charge Voltage Settings
1000
800
V_SYS = 5V
R_PROG = 2k
600
400
200
0
2.7
F2 = 0, F1 = 0, F0 = 0
F2 = 0, F1 = 0, F0 = 1
F2 = 0, F1 = 1, F0 = 0
F2 = 0, F1 = 1, F0 = 1
2.9
3.1
3.3
3.5
3.7
V_BAT (V)
4040 G02
Step–-Down Charger Efffiiciency
vs V_BBAATT
100
95
90
85
80
R_PROG = 4k
75
R_PROG = 2k
R_PROG = 1.33k
70
R_PROG = 1k
V_SYS = 5V
R_PROG = 0.8k
F2 = F1 = F0 = 1
65
60
2.8 3.0 3.2 3.4 3.6 3.8 4.0
V_BAT (V)
4040 G03
II_BBAATT vvss VV_BBAATT ((LLii-–IIoonn))wwiitthhDifferent
PDRifOfeGreRnetsPiRstOoGr VRaeluseisstor Values
3000
2500
V_SYS = 5V
F2, F1, F0 = 1
R_PROG = 0.8k
2000
R_PROG = 1k
1500
R_PROG = 1.33k
1000
R_PROG = 2k
500
R_PROG = 4K
0
2.7
3.0
3.3
3.6
3.9
4.2
V_BAT (V)
4040 G04
Step–-Down Charger Oscillator
Frequency vs Temperature
2.30
2.20
2.10
2.00
V_IN = 5.5V
V_IN = 5.0V
1.90
V_IN = 3.6V
V_BAT = 3.2V
1.80
–45
–10 25
60
95
130
TEMPERATURE (°C)
4040 G07
I_BAT vs V_BAT (LiFePO₄) with
Different PPRROOGGRReessiissttoorrVVaalluueess
3000
2500
V_SYS = 5V
F2 = 0, F1 = F0 = 0
R_PROG = 0.8k
2000
R_PROG = 1k
1500
R_PROG = 1.33k
1000
R_PROG = 2k
500
R_PROG = 4k
0
2.7
2.9
3.1
3.3
3.5
3.7
V_BAT (V)
4040 G05
Step-Down Charger PMOS
SOtne-pR–eDsoiswtannCcheavrsgeVr_SP_YSMoOvSerR_ds(ON)
vTesmV_Sp_Ye_Sraotvuerer Temperature
200
180
130°C
160
90°C
60°C
140
25°C
–10°C
120
–45°C
100
80
3.6 3.8 4 4.2 4.4 4.6 4.8 5.0
V_SYS (V)
4040 G08
BaBtatettreyryChCahragregeVoVlotaltgaege(L(iL-Iio-Ino)n)
vsvsTeTmempepreartautruere
4.20
4.15
4.10
4.05
4.00
3.95
3.90
3.85
3.80
3.75 ^VSYS ^{= 5V}
F2 = F1 = F0 = 1
3.70
–50 –30 –10 10 30 50 70 90
TEMPERATURE (°C)
110 130
4040 G06
Step-Down Charger NMOS
SOtne-pR–eDsoiswtannCcheavrsgeVr_SN_YSMoOvSerR_DS(ON)
vTsemV_Sp_Ye_Sraotvuerer Temperature
200
180
130°C
160
90°C
140
60°C
120
25°C
–10°C
100
–45°C
80
3.6 3.8 4 4.2 4.4 4.6 4.8 5.0
V_SYS (V)
4040 G09
4040fa
6
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