MAX4080 Maxim, MAX4080 Datasheet - Page 10

• Manufacturer Part Number: MAX4080
• Description: The MAX4080/MAX4081 are high-side, current-sense amplifiers with an input voltage range that extends from 4
• Manufacturer: Maxim

that swings above V
ages and below V
V
Set the full-scale output range by selecting R
the appropriate gain version of the MAX4080/
MAX4081.
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
Figure 1. MAX4081T OUT Transfer Curve
Figure 2. MAX4080 Functional Diagram
10
OUT
______________________________________________________________________________________
is equal to V
I
LOAD
CURRENT
MIRROR
Q1
RS+
R
G1
4.5V TO 76V
BATTERY
R
V
I
REF
A2
SENSE
SENSE
REF
A1
REF
when V
for negative-sense voltages.
voltage for positive-sense volt-
RS-
R
I
A2
G2
LOAD
V
CC
SENSE
RS-
MAX4080
MAX4081T
V
R
SENSE
SENSE
GND
is equal to zero.
A3
RS+
REF1A
REF1B
OUT
I
CHARGE
SENSE
OUT
AND CHARGER
SYSTEM LOAD
5V
and
DISCHARGE CURRENT
V
OUT
Figure 3. MAX4081 Functional Diagram
Note: For Gain = 5 (F), R G1 = R G2 = 160k.
= V
-250mV
GND
For Gain = 20 (T), R G1 = R G2 = 60k.
For Gain = 60 (S), R G1 = R G2 = 20k .
CURRENT
MIRROR
Q1
R
RS+
G1
V
10V
SENSE
-5V
5V
A1
GND
CURRENT
RS-
R
MIRROR
G2
Q2
CHARGE CURRENT
V
REF1A
250mV
MAX4081
V
= V
V
SENSE
OUT
REF1B
= 10V
= 5V
A2
RF
125kΩ
125kΩ
V
REF
OUT
REF1B
REF1A