Datasheet

4
LTC1325
TYPICAL PERFORMANCE CHARACTERISTICS
UW
LOAD CURRENT (mA)
0
REGULATOR OUTPUT VOLTAGE (V)
3.074
3.075
3.076
3.0
1325 G01
3.073
3.072
0.5 1.0 1.5 2.5 3.52.0 4.0
3.071
3.070
3.077
V
DD
= 12V
V
DD
= 4.5V
V
DD
= 16V

T
A
= 27°C
TEMPERATURE (°C)
0
0
SHUTDOWN CURRENT (µA)
5
15
20
25
20
40
50 90
1325 G06
10
10 30
60
70
80
V
DD
= 12V
V
DD
= 16V
V
DD
= 4.5V
TEMPERATURE (°C)
0
V
DD
SUPPLY CURRENT (µA)
1000
900
800
700
600
500
400
300
200
100
0
20
40
50 90
1325 G03
10 30
60
70
80
V
DD
= 16V
V
DD
= 4.5V
V
DD
= 12V
DAC Output Voltage vs
Temperature
TEMPERATURE (°C)
0
3.072

3.073
3.075
3.076
3.077
3.082
3.079
20
40
50 90
1325 G02
3.074
3.080
3.081
3.078
10 30
60
70
80
V
DD
= 16V
I
REG
= 0
V
DD
= 4.5V
REGULATOR OUTPUT VOLTAGE (V)
V
DD
= 12V
Fault Comparator Threshold vs
Temperature
Fault Comparator Threshold vs
Temperature
TEMPERATURE (°C)
0
FAULT COMPARATOR THRESHOLD (V)
11
10
9
8
7
6
5
4
3
2
1
20
40
50
1325 G08
10 30
60
70
80
V
BAT
FOR BATP = HIGH, V
DD
= 12V
V
CELL
FOR MCV = HIGH, V
MCV
= 2.8V AND
V
TBAT
FOR LTF = HIGH, V
LTF
= 2.8V
V
TBAT
FOR HTF = HIGH, V
HTF
= 1.35V
V
CELL
FOR MCV = HIGH, V
MCV
= 1.6V
V
TBAT
FOR LTF = HIGH, V
LTF
= 1.6V
Gas Gauge Gain and Offset vs
Temperature
V
DD
Supply Current vs
Temperature
TEMPERATURE (°C)
0
–4.5
GAS GAUGE GAIN AND OFFSET (COUNTS)
–4.0
–3.0
–2.5
–2.0
7060
0
1325 G09
–3.5
10 20 30 40 50 80
–1.5
–1.0
–0.5
V
SENSE
= –0.2V AND –0.4V
INCLUDES CHANGES IN V
REG

WITH TEMPERATURE
GAS GAUGE OFFSET
GAS GAUGE GAIN
Charge Current vs Battery Voltage
Regulator Output Voltage vs
Load Current
Regulator Output Voltage vs
Temperature
TEMPERATURE (°C)
0
DAC OUTPUT VOLTAGE (mV)
180
160
140
120
100
80
60
40
20
0
30 50
1325 G05
10 20
40 60 70
V
DD
= 12V

VR1 = 1, VR0 = 1
VR1 = 1, VR0 = 0
VR1 = 0, VR0 = 0
VR1 = 0, VR0 = 1
Shutdown Current vs Temperature
BATTERY VOLTAGE (V)
0
CHARGE CURRENT (mA)
160
140
120
100
80
60
40
20
0
2
468
1325 G04
10 12

VR1 = 1, VR0 = 1
VR1 = 1, VR0 = 0
VR1 = 0, VR0 = 0
VR1 = 0, VR0 = 1
V
DD
= 12V, R
SENSE
= 1Ω,
L = 100µH, P1: IRF9531
TEMPERATURE (°C)
0
0
FAULT COMPARATOR THRESHOLD (V)
0.1
0.3
0.4
0.5
1.0
0.7
20
40
50
1325 G07
0.2
0.8
0.9
0.6
10 30
60
70
80
V
CELL
FOR EDV = HIGH
V
TBAT
FOR HTF = HIGH, V
HTF
= 0.4V
V
CELL
FOR BATR = HIGH