LTC1772B
TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage
vs Temperature
825
820
815
V
FB
VOLTAGE (mV)
Normalized Oscillator Frequency
vs Temperature
10
8
NORMALIZED FREQUENCY (%)
Undervoltage Lockout Trip
Voltage vs Temperature
2.24
2.20
2.16
TRIP VOLTAGE (V)
V
IN
= 4.2V
V
IN
= 4.2V
V
IN
FALLING
6
4
2
0
–2
–4
–6
–8
810
805
800
795
790
785
780
775
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1772 G01
2.12
2.08
2.04
2.00
1.96
1.92
1.88
–10
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1772 G02
1.84
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1772 G03
Maximum (V
IN
– SENSE
–
) Voltage
vs Duty Cycle
120
110
TRIP VOLTAGE (mV)
Shutdown Threshold
vs Temperature
600
560
520
I
TH
/RUN VOLTAGE (mV)
V
IN
= 4.2V
T
A
= 25°C
V
IN
= 4.2V
100
90
80
70
60
50
40
20
30
40
50 60 70 80
DUTY CYCLE (%)
90
100
480
440
400
360
320
280
240
200
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
1772 G05
1772 G04
1772bfa
4
LINER [ LINEAR TECHNOLOGY ]
