LT3689 LINER [Linear Technology], LT3689 Datasheet - Page 3

• Manufacturer Part Number: LT3689
• Description: 700mA Step-Down Regulator with Power-On Reset and Watchdog Timer
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
junction temperature range, otherwise specifi cations are at T
SYMBOL
f
t
V
t
t
t
V
V
SW
SW(OFF)
RST
WDU
WDL
RST
OL
OH
PARAMETER
V
V
Quiescent Current from V
Quiescent Current from OUT
LT3689-5 Quiescent Current from V
LT3689-5 Quiescent Current from OUT
LT3689 FB Voltage
LT3689-5 Output Voltage
LT3689 FB Pin Bias Current
LT3689 FB Voltage Line Regulation
LT3689-5 Output Voltage Line Regulation
Switching Frequency
Switch Off-Time
Foldback Frequency
Switch Current Limit (Note 4)
Switch V
Switch Leakage Current
DA Current Limit
Boost Schottky Reverse Leakage
Minimum BST Above SW Voltage
BST Pin Current
EN/UVLO Threshold Voltage
EN/UVLO Pin Current
EN/UVLO Pin Current Hysteresis
SYNC Threshold Voltage
Reset Threshold as % of V
Reset Timeout Period
Watchdog Upper Boundary
Watchdog Lower Boundary
RST, WDO Output Voltage Low
RST, WDO Output Voltage High (Note 6)
IN
IN
Fixed Undervoltage Lockout
Overvoltage Lockout
CESAT
IN
FB
IN
CONDITIONS
V
V
V
V
V
V
V
V
V
V
V
V
5V < V
5.5V < V
R
R
V
R
I
V
I
V
V
I(V
C
C
C
I
I
SW
SW
SINK
SINK
EN/UVLO
OUT
OUT
EN/UVLO
OUT
OUT
EN/UVLO
OUT
OUT
EN/UVLO
OUT
FB
T
T
BST
T
BST
EN/UVLO
EN/UVLO
POR
WDT
WDT
EN/UVLO
= 4.02k
= 31.62k
= 4.22k, V
The
= 0.800V
= 0.8A
= 0.8A
= 12V
= 12V, V
= 2.5mA, V
= 100μA, V
= 3V, Not Switching
= 0V, Not Switching
= 3V, Not Switching (Note 7)
= 0V, Not Switching
= 5.5V (Note 8)
= 0V
= 5.5V
= 8200pF
A
= 1000pF
= 1000pF
IN
= 25°C. V
l
IN
< 36V
= 0.3V
= 0.3V
= 0.3V
= 0.3V
= 1.35V
= 1.15V
denotes the specifi cations which apply over the full operating
< 36V
= 1.35V) – I(V
OUT
OUT
OUT
OUT
= 0V
= 0V
IN
= 0V
= 0V
= 12V, V
EN/UVLO
OUT
= 1.15V)
= 5V, unless otherwise noted. (Note 3)
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
LT3689/LT3689-5
V
0.790
0.780
4.950
4.900
1.150
OUT
MIN
1.84
1.15
0.85
420
610
2.5
2.8
0.4
36
88
17
17
–1
0.800
5.000
0.005
0.005
1.260
0. 01
0.01
0.01
0.01
1.55
0.01
0.15
0.05
TYP
125
125
–30
500
120
250
450
675
3.4
1.2
0.1
1.8
4.1
3.8
0.8
38
50
75
–5
50
95
15
90
19
19
8
2
0.812
0.812
5.050
5.100
1.350
–100
MAX
2.16
1.95
175
150
–20
175
150
540
160
785
3.7
0.5
0.5
0.5
1.5
2.5
5.5
4.8
0.4
0.3
40
95
95
16
25
92
21
21
1
5
1
1
UNITS
3689fa
3
MHz
%/V
%/V
kHz
kHz
mV
mA
ms
ms
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
nA
μA
μA
μA
μA
μA
ns
μs
%
V
V
V
V
V
V
A
A
V
V
V
V
V
V