Datasheet

6
LTC1759
TYPICAL PERFOR A CE CHARACTERISTICS
UW
1µs/DIV
1759 G02
5V
0V
R
PULLUP
= 15k
LTC1759
V
CC
= 5V
C
LD
= 200pF
T
A
= 25°C
TEMPERATURE (°C)
0
DCDIV (V)
1.10
1.05
1.00
0.95
0.90
1759 G03
10 20 30 40 50 60 70 80
V
DD
= 5.5V
V
DD
= 3V
V
BAT
(V)
6 8 10 12 14 16 18 20 22 24
I
BAT
(µA)
1759 G04
90
80
70
60
50
40
30
20
10
T
A
= 25°C
V
DD
(V)
3.0 3.5 4.0 4.5 5.0 5.5
I
DD
(µA)
1759 G05
120
110
100
90
80
70
60
T
A
= 25°C
CHARGING CURRENT (mA)
256
1256 2256 3256 4256
OUTPUT CURRENT ERROR (mA)
1759 G06
0
–10
–20
–30
–40
–50
–60
R
ILIMIT
= 33k
V
IN
= 15V
V
OUT
= 12V
T
A
= 25°C
V
DD
= 5.5V
V
DD
= 3V
CHARGING VOLTAGE (mV)
2000 3000 4000 5000 6000 7000 8000 9000
OUTPUT VOLTAGE ERROR (mV)
1759 G07
0
–5
–10
–15
–20
–25
–30
R
VLIMIT
= 0
LOAD CURRENT = 15mA
T
A
= 25°C
V
DD
= 5.5V
V
DD
= 3V
CHARGING VOLTAGE (mV)
2000
6000 10000 14000 18000
OUTPUT VOLTAGE ERROR (mV)
1759 G08
0
–5
–10
–15
–20
–25
–30
R
VLIMIT
= 33k
LOAD CURRENT = 15mA
T
A
= 25°C
V
DD
= 5.5V
V
DD
= 3V
SMBus Accelerator Operation DCDIV Trip Point vs Temperature
I
DD
vs V
DD
(Not Charging) Programmed Current Accuracy
Current from Battery vs Battery
Voltage (Does Not Include V
DD
Current)
Charging Voltage ErrorCharging Voltage Error
CHARGING CURRENT (mA)
0
50 100 150 200 250 300
OUTPUT CURRENT (mA)
1759 G01
350
300
250
200
150
100
50
0
R
ILIMIT
= 33k
V
IN
= 15V
V
OUT
= 12V
T
A
= 25°C
C
PROG
= 1nF
R
SET
= 3.83k
Low Current Mode
CHARGING CURRENT (A)
0.5
1.5 2.5 3.5
EFFICIENCY (%)
1759 G09
100
95
90
85
80
75
70
16.8V
12.6V
V
IN
= 20V
Charger Efficiency