LTC4110
7
4110fb
4110 G01
500ns/DIV
5V/DIV
0V
V
IN
= 12V
V
BAT
= 12V (NiMH)
I
LOAD
(A)
EFFICIENCY (%)
100
90
80
70
60
0
50
40
30
20
10
POWER LOSS (W)
2.5
2.0
1.5
0
1.0
0.5
4110 G07
0.05
0.2
0.1
0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.00
EFFICIENCY
POWER LOSS
V
BAT
(V)
0
I
BA
T
(μA)
15
4110 G06
25
20
10
5
40
35
30
20
10
25
15
5
0
4110 G04
0
5
10
15
25
20
V
BAT
(V)
I
BA
T
(μA)
140
120
100
80
60
40
20
–20
0
V
BAT
(V)
I
BA
T
(mA)
1200
1000
800
600
400
200
0
4110 G02
0
4
2
6
8
10
12
14
PRE-CHARGE
CC
CV
DCIN (V)
I
DCIN
(mA)
2.5
2.0
1.5
1.0
0.5
0
4110 G03
0
5
10
15
20
TYPICAL PERFORMANCE CHARACTERISTICS
Typical CHGFET and DCHFET
Waveforms
Output Charging Characteristics
Showing Constant Current and
Constant Voltage Operation
Supply Current vs DCIN Voltage in
Idle Mode
Battery Leakage in Idle
Mode – IBIDL
Battery Current in Backup
Mode – IBBU
Battery Leakage in Shutdown
Mode vs Battery Voltage
Charging Effi ciency/Power Loss,
12V
IN
and 12.6V
OUT
(Xfmr = BH
510-1019)
Soft-Start Waveform
Backup Mode On and Off
Waveform
4110 G05
0
5
10
15
25
20
V
BAT
(V)
I
BA
T
(mA)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0
0.4
0.2
4110 G08
2ms/DIV
0.2A/DIV
0A
4110 G09
10ms/DIV
NiMH BATTERY (12V)
I
LOAD
= 3A
V
IN
= 15V FALLING
V
BATTERY
3V/DIV
V
BACKUP
2V/DIV
0V
