LT2940
5
2940f
V
I
(mV)
–200
400
600
200
0
0 200
–200
–400
800
2940 G01
V
V
= –8V
–4V
V
V
= V
V
+ – V
V
–
V
I
= V
I
+ – V
I
–
V
CC
≥ 11V
V
PMON
= 0.5V
–2V
0V
2V
8V4V
I
PMON
(µA)
V
I
(mV)
–200
1
2
0
–1
0
–100
100 200
–2
–3
3
2940 G02
V
V
= 8V
V
V
= 8V
–4V
|V
V
• V
I
| ≤ 0.4V
2
T
A
= 25°C
–2V
0V
2V
4V
E
PMON
(%FS)
ONE REPRESENTATIVE UNIT
TEMPERATURE (°C)
–50
–4
E
PMON
(%FS)
–3
–1
0
1
4
3
0
50
75
–2
2
–25
25
100
125
2949 G03
–8V ≤ V
V
≤ 8V
–200mV ≤ V
I
≤ 200mV
|V
V
• V
I
| ≤ 0.4V
2
V
CC
= 12V
V
CC
= 80V
V
CC
= 80V
V
CC
= 12V
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into pins are positive, and all voltages are referenced
to GND unless otherwise noted. Current sourced by the PMON pin or the
IMON pin is defi ned as positive; current sunk as negative.
Note 3: The LT2940 may safely drive its own PMON and IMON output
voltages above the absolute maximum ratings. Do not apply any external
source that drives the voltage above absolute maximum.
Note 4: Full-scale equals ±200µA.
Note 5: V
+
and V
–
pin voltages must each fall within the voltage sense pin
operating range specifi cation.
Note 6: I
+
and I
–
pin voltages must each fall within the current sense pin
operating range specifi cation.
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. All specifi cations apply at 6V ≤ V
CC
≤ 80V, unless otherwise specifi ed.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
CMPOUT(LK)
CMPOUT Leakage Current CMP
+
Low, V
CC
= 36V,
0.4V ≤ V
CMPOUT
≤ 36V
l
±0.15 ±1 µA
I
CMPOUT(OL)
CMPOUT Output Low Voltage CMP
+
Low, I
CMPOUT
= 3mA
l
0.2 0.4 V
I
CMPOUT(LK)
CMPOUT Leakage Current CMP
+
High, V
CC
= 36V,
0.4V ≤ V
CMPOUT
≤ 36V
l
±0.15 ±1 µA
t
DLY
Comparator Propagation Delay Output Pulling Down
l
0.7 2 µs
V
LATCH(IL)
LATCH Input Low Voltage
l
0.5 0.8 1.2 V
V
LATCH(IO)
LATCH Input Open Voltage
l
1.25 1.5 1.95 V
V
LATCH(IH)
LATCH Input High Voltage
l
2.0 2.2 2.5 V
I
LATCH(LK)
LATCH Input Allowable Leakage in
Open State
l
±10 µA
I
LATCH(BIAS)
LATCH Input Bias Current V
LATCH
= 0V
l
–11 –17 –23 µA
V
LATCH
= 80V
l
11 17 23 µA
TYPICAL PERFORMANCE CHARACTERISTICS
PMON Output Current
vs Sense Input Voltages
PMON Total Error
vs Sense Input Voltages PMON Error Band vs Temperature
