lt6109-1 Linear Technology Corporation, lt6109-1 Datasheet - Page 8

• Manufacturer Part Number: lt6109-1
• Description: High Side Current Sense Amplifer With Reference And Comparators
• Manufacturer: Linear Technology Corporation

LT6109-1/LT6109-2
TYPICAL PERFORMANCE CHARACTERISTICS
V
otherwise noted. (See Figure 3)
0.5V/DIV
PIN FUNCTIONS
SENSELO (Pin 1): Sense Amplifier Input. This pin must
be tied to the load end of the sense resistor.
EN/RST (Pin 2): Enable/Comparator Reset Input. When
low for longer than 150µs typically, the LT6109 will enter
shutdown mode. Pulsing this pin low for between 2µs and
15µs will reset the comparators of the LT6109.
OUTC2 (Pin 3): Open-Drain Output for Comparator 2.
Off-state voltage may be as high as 60V above ground,
regardless of V
8
V
+
2V/DIV
5V/DIV
EN/RST
V
= 12V, V
OUTC
V
INC
0V
0V
0V
23
18
13
–2
3
8
0
Comparator Output Leakage
Current vs Pull-Up Voltage
COMPARATOR OUTPUT PULL-UP VOLTAGE (V)
Comparator Step Response
(5mV INC1 Overdrive)
PULLUP
10
–40°C AND 25°C
+
20
= V
used.
125°C
+
5µs/DIV
, V
30
EN/RST
40
= 2.7V, R
50
610912 G28
610912 G31
IN
60
= 100Ω, R
0.5V/DIV
V
2V/DIV
5V/DIV
V
EN/RST
OUTC
V
INC
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0V
0V
0V
0
0
OUT
Comparator Step Response
(100mV INC1 Overdrive)
Comparator Propagation Delay
vs Input Overdrive
L TO H
COMPARATOR INPUT OVERDRIVE (mV)
H TO L
= R1 + R2 + R3 = 10k, gain = 100, R
40
80
5µs/DIV
OUTC1 (Pin 4): Open-Drain Output for Comparator 1.
Off-state voltage may be as high as 60V above ground,
regardless of V
V
nected to ground.
INC1 (Pin 6): Inverting Input of Comparator 1. The nonin-
verting input is internally connected to the 400mV reference.
–
120
(Pin 5): Negative Supply Pin. This pin is normally con-
160
Performance characteristics taken at T
610912 G32
610912 G29
200
+
used.
V
C
5V/DIV
2V/DIV
EN/RST
10000
V
1000
OUTC
= 25.5k, C
100
0V
0V
10
1
Comparator Rise/Fall Time
vs Pull-Up Resistor
Comparator Reset Response
V
V
100mV OVERDRIVE
OH
OL
= 0.1 • V
= 0.9 • V
L
R
= C
C
PULL-UP RESISTOR (k )
PULLUP
PULLUP
10
LC
= 2pF , unless
5µs/DIV
FALL TIME
A
100
= 25°C,
RISE TIME
610912 G30
610912 G33
610912f
1000