LT6109-1/LT6109-2
8
610912fa
Comparator Rise/Fall Time
vs Pull-Up Resistor
Comparator Step Response
(5mV INC1 Overdrive)
Comparator Step Response
(100mV INC1 Overdrive)
Comparator Reset Response
SENSELO (Pin 1): Sense Amplifier Input. This pin must
be tied to the load end of the sense resistor.
EN/RST (Pin 2): Enable and Latch Reset Input. When the
EN/RST pin is pulled high the LT6109 is enabled. When the
EN/RST pin is pulled low for longer than typically 40µs,
the LT6109 will enter the shutdown mode. Pulsing this pin
low for between 2µs and 15µs will reset the comparators
of the LT6109.
Comparator Propagation Delay
vs Input Overdrive
PIN FUNCTIONS
OUTC2 (Pin 3): Open-Drain Comparator 2 Output. Off-
state voltage may be as high as 60V above V
–
, regardless
of V
+
used.
OUTC1 (Pin 4):
Open-Drain Comparator 1 Output. Off-
state voltage may be as high as 60V above V
–
, regardless
of V
+
used.
V
–
(Pin 5): Negative Supply Pin. This pin is normally con-
nected to ground.
Comparator Output Leakage
Current vs Pull-Up Voltage
COMPARATOR OUTPUT PULL-UP VOLTAGE (V)
0
–2
OUTC1, OUTC2 LEAKAGE CURRENT (nA)
3
8
13
18
125°C
10
20 30 40
610912 G28
50 60
–40°C AND 25°C
R
C
PULL-UP RESISTOR (kΩ)
1
10
100
1000
10000
10 100 1000
610912 G30
RISE TIME
FALL TIME
V
OH
= 0.9 • V
PULLUP
V
OL
= 0.1 • V
PULLUP
100mV INC1 OVERDRIVE
C
L
= 2pF
V
INC
0.5V/DIV
0V
V
OUTC
2V/DIV
0V
V
EN/RST
5V/DIV
0V
610912 G31
5µs/DIV
0V
V
INC
0.5V/DIV
V
OUTC
2V/DIV
V
EN/RST
5V/DIV
0V
0V
610912 G32
5µs/DIV
0V
V
OUTC
5V/DIV
V
EN/RST
2V/DIV
0V
5µs/DIV
610912 G33
Performance characteristics taken at T
A
= 25°C,
V
+
= 12V, V
PULLUP
= V
+
, V
EN/RST
= 2.7V, R
IN
= 100Ω, R
OUT
= R1 + R2 + R3 = 10k, gain = 100, R
C
= 25.5k, C
L
= C
LC
= 2pF, unless
otherwise noted. (See Figure 3)
TYPICAL PERFORMANCE CHARACTERISTICS
COMPARATOR INPUT OVERDRIVE (mV)
0
COMPARATOR PROPAGATION DELAY (µs)
3.0
4.0
160
2.0
1.0
2.5
3.5
4.5
1.5
0.5
0
40
80
120
200
H TO L
L TO H