lt3689-5 Linear Technology Corporation, lt3689-5 Datasheet - Page 8

• Manufacturer Part Number: lt3689-5
• Description: 700ma Step-down Regulator With Power-on Reset And Watchdog Timer
• Manufacturer: Linear Technology Corporation

LT3689/LT3689-5
TYPICAL PERFORMANCE CHARACTERISTICS
8
POR COMPARATOR OVERDRIVE VOLTAGE AS PERCENTAGE
800
700
600
400
200
100
500
300
0
0.10
Transient Duration
vs POR Comparator Overdrive
OF RESET THRESHOLD, V
RESET OCCURS
ABOVE THE CURVE
1.00
10000
1000
0.01
100
0.1
21
20
19
18
17
10
1
0.001 0.01
–50 –25
Reset Timeout Period
Reset Timeout Period
vs Capacitance
C
MURATA:
GRM2195C1H822FA01
POR
10.00
C
= 8.2nF
POR
RST
0
PIN CAPICITANCE, C
0.1
(%)
TEMPERATURE (°C)
25
3689 G30
1
100.00
50
10
75
100 1000 10000
POR
100
21
20
19
18
17
(nF)
–50 –25
125 150
Watchdog Upper Boundary Period
C
MURATA:
GRM1882C1H102FA01
3689 G33
3689 G35
WDT
= 1nF
0
TEMPERATURE (°C)
25
50
100000
10000
10000
1000
1000
0.01
75
100
100
0.1
0.1
10
10
0.001
0.001 0.01
1
1
Watchdog Upper Boundary Period
vs Capacitance
Watchdog Lower Boundary Period
vs Capacitance
100
C
C
0.01
125 150
WDT
WDT
3689 G31
PIN CAPICITANCE, C
PIN CAPICITANCE, C
0.1
0.1
1
1
7.0
5.5
5.0
6.5
6.0
10
–50 –25
Watchdog Lower Boundary Period
10
C
MURATA:
GRM1885C1H102FA01
WDT
100 1000 10000
WDT
WDT
= 10nF
(nF)
(nF)
100
0
3689 G36
3689 G34
TEMPERATURE (°C)
1000
25
50
75
100
125 150
3689 G32
3689fa