lt2940 Linear Technology Corporation, lt2940 Datasheet - Page 5

• Manufacturer Part Number: lt2940
• Description: Power And Current Monitor
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
SYMBOL
I
I
I
t
V
V
V
I
I
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.
temperature range, otherwise specifi cations are at T
TYPICAL PERFORMANCE CHARACTERISTICS
CMPOUT(LK)
CMPOUT(OL)
CMPOUT(LK)
DLY
LATCH(LK)
LATCH(BIAS)
LATCH(IL)
LATCH(IO)
LATCH(IH)
–400
–200
600
800
400
200
0
–200
PMON Output Current
vs Sense Input Voltages
–4V
–2V
0V
2V
4V
V
V
PARAMETER
CMPOUT Leakage Current
CMPOUT Output Low Voltage
CMPOUT Leakage Current
Comparator Propagation Delay
LATCH Input Low Voltage
LATCH Input Open Voltage
LATCH Input High Voltage
LATCH Input Allowable Leakage in
Open State
LATCH Input Bias Current
V
I
= V
V
= V
V
8V
I +
= –8V
V +
– V
– V
I –
V
V –
I
(mV)
0
V
V
CC
PMON
≥ 11V
= 0.5V
2940 G01
200
–1
–2
–3
3
2
1
0
–200
A
PMON Total Error
vs Sense Input Voltages
ONE REPRESENTATIVE UNIT
0V
–2V
2V
= 25°C. All specifi cations apply at 6V ≤ V
CONDITIONS
CMP
0.4V ≤ V
CMP
CMP
0.4V ≤ V
Output Pulling Down
V
V
LATCH
LATCH
The
4V
–4V
V
+
+
+
–100
V
Low, V
Low, I
High, V
= 8V
= 0V
= 80V
CMPOUT
CMPOUT
l
V
V
denotes the specifi cations which apply over the full operating
= 8V
CMPOUT
CC
V
CC
I
(mV)
= 36V,
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
operating range specifi cation.
Note 6: I
operating range specifi cation.
0
≤ 36V
≤ 36V
= 36V,
= 3mA
|V
T
A
V
= 25°C
+
100
• V
+
and I
and V
I
| ≤ 0.4V
2940 G02
–
–
pin voltages must each fall within the current sense pin
2
pin voltages must each fall within the voltage sense pin
200
l
l
l
l
l
l
l
l
l
l
CC
–1
–2
–3
–4
4
3
2
1
0
≤ 80V, unless otherwise specifi ed.
–50
PMON Error Band vs Temperature
1.25
MIN
–11
–8V ≤ V
–200mV ≤ V
|V
0.5
2.0
11
V
–25
• V
I
| ≤ 0.4V
V
≤ 8V
0
TEMPERATURE (°C)
I
±0.15
±0.15
≤ 200mV
TYP
–17
0.2
0.7
0.8
1.5
2.2
17
2
25
50
LT2940
MAX
1.95
±10
–23
0.4
1.2
2.5
±1
±1
23
2
75
V
V
V
V
CC
CC
CC
CC
= 80V
= 12V
= 12V
= 80V
100
2949 G03
UNITS
5
2940f
125
μA
μA
μA
μA
μA
μs
V
V
V
V