Typical operating characteristics – Rainbow Electronics DS2778 User Manual
Page 6
DS2775/DS2776/DS2777/DS2778
2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
6
_______________________________________________________________________________________
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
DISCHARGE-OVERCURRENT
PROTECTION DELAY
DS2775/6/7/8 toc01
DC FET
GATE
2V/div
2V/div
0V
0V
0V
0V
1V/div
20mV/div
DC FET
SOURCE
V
GS
V
SNS
25m
Ω
SENSE RESISTOR
WITH DISCHARGE-
OVERCURRENT
THRESHOLD = 38mV
TIME (ms)
18
16
14
12
10
8
6
4
2
0
20
CC FET GATE TURN-OFF DURING
CHARGE-OVERCURRENT EVENT
DS2775/6/7/8 toc02
CC FET
GATE
2V/div
2V/div
0V
0V
0V
0V
1V/div
20mV/div
CC FET
SOURCE
V
GS
CC FET
V
SNS
25m
Ω
SENSE RESISTOR
WITH CHARGE-
OVERCURRENT
THRESHOLD = 25mV
TIME (
μs)
45
40
35
30
25
20
15
10
5
0
50
DC FET GATE TURN-OFF DURING
SHORT-CIRCUIT EVENT
DS2775/6/7/8 toc03
DC FET
GATE
2V/div
0V
0V
0V
0V
2V/div
1V/div
50mV/div
DC FET
SOURCE
V
GS
DC FET
V
SNS
25m
Ω
SENSE RESISTOR
WITH SHORT-CIRCUIT
THRESHOLD = 150mV
TIME (
μs)
18
16
14
12
10
8
6
4
2
0
20
SHORT-CIRCUIT PROTECTION
DELAY
DS2775/6/7/8 toc04
DC FET
GATE
2V/div
0V
0V
0V
0V
2V/div
1V/div
100mV/div
DC FET
SOURCE
V
GS
DC FET
V
SNS
25m
Ω
SENSE RESISTOR
WITH SHORT-CIRCUIT
THRESHOLD = 150mV
TIME (
μs)
180
160
140
120
100
80
60
40
20
0
200
VOLTAGE MEASUREMENT
ACCURACY
DS2775/6/7/8 toc05
V
INX
(V)
ACCURACY (mV)
4
3
2
1
2
4
6
8
10
12
14
16
18
20
0
0
+70
°C
-20
°C
+25
°C
CHARGE-PUMP STARTUP EXITING SLEEP
MODE (V
DD
= 8V NO LOAD ON PK+)
DS2775/6/7/8 toc06
TIME (ms)
VOLTAGE (V)
90
80
10 20 30
50 60
40
70
0
2
3
4
5
6
7
8
-2
0
100
2.75V
12.6V