SC310ASKTRT Semtech, SC310ASKTRT Datasheet - Page 8

• Manufacturer Part Number: SC310ASKTRT
• Description: IC AMP CURRENT SENSE SOT-23-6
• Manufacturer: Semtech

Specifications of SC310ASKTRT

• Amplifier Type: Current Sense
• Number Of Circuits: 1
• -3db Bandwidth: 2MHz
• Current - Input Bias: 150µA
• Current - Supply: 270µA
• Voltage - Supply, Single/dual (±): 3 V ~ 25 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Current - Output / Channel: -
• Slew Rate: -
• Gain Bandwidth Product: -
• Voltage - Input Offset: -
• Other names: SC310ASKTR

SC310 is a unidirectional high-side current sense ampli-
fier for precision current monitoring. It has a wide com-
mon-mode range of 2.7 to 25V and allows high-side cur-
rent-sensing at voltages greater than supply voltage (V
The SC310 operates as follows: Current from source (as
shown in the typical applications circuit on page. 1), flows
through RSENSE to the load. Since the inverting input of
amplifier A has a high input impedance, negligible cur-
rent flows through R5 (neglecting the input bias current).
Amplifier A has an inverting input voltage which equals
V(CS+) - I
forces the non-inverting input voltage to the same volt-
age as the inverting input. The drop across R4 equals
I
(I
for amplifier A, A1, A2 or A3 (neglecting the input bias
currents for non-inverting inputs for amplifiers A and B).
The second amplifier, B, is a fixed gain stage (gain = B)
and the final output includes the gain obtained from this
stage.
LOAD
Block Diagram
Detailed Description
POWER MANAGEMENT
LOAD
2005 Semtech Corp.
*R
*R
SENSE
SENSE
LOAD
)/R4. Resistor R3 then sets the overall gain
.
SHDN
*R
CS+
CS-
SENSE
Since I
. The amplifier’s high open-loop gain
R4
flows through R4, IR4 =
Disable
R5
1k
R4
1k
+
-
A
Gain = A1
Gain = A2
Gain = A3
CC
).
8
10k
R3
The SC310 has three gain versions as follows:
S
S
S
e V
e V
e V
e V
e V
C
C
C
Q1
3
i s r
i s r
i s r
i s r
i s r
3
3
1
1
1
n o
n o
n o
n o
n o
0
0
0
B
A
C
+
-
B
VCC
G
G
G
G
G
a
a
a
a
a
Gain = B
n i
n i
n i
n i
n i
x E
x E
x E
A
A
A
R1
R2
x E
x E
1
2
3
r p
r p
r p
r p
r p
*
*
*
B
B
B
s e
s e
s e
s e
s e
i s
i s
i s
i s
i s
n o
n o
n o
20k
n o
n o
5k
G
G
G
G
G
www.semtech.com
a
a
a
a
a
n i
n i
n i
n i
n i
GND
OUT
1
SC310
5
2
0
a V
a V
a V
a V
a V
0
0
0
u l
u l
u l
u l
u l
e
e
e
e
e