MAX9934FART+TG0Y Maxim Integrated, MAX9934FART+TG0Y Datasheet - Page 10

• Manufacturer Part Number: MAX9934FART+TG0Y
• Description: Special Purpose Amplifiers
• Manufacturer: Maxim Integrated
• Series: MAX9934r

The MAX9934 high-side, current-sense amplifier moni-
tors current through an external current-sense resistor
by amplifying the voltage across the resistor (V
to create an output current (I
(V
tor (R
The MAX9934 uses precision amplifier design tech-
niques to achieve a low-input offset voltage of less than
10µV. These techniques also enable extremely low-input
offset voltage drift over time and temperature and
High-Precision, Low-Voltage, Current-Sense Amplifier
with Current Output and Chip Select for Multiplexing
MAX9934
10
OUT
UCSP
A1
A2
A3
B1
B2
B3
V
—
*R
RS+
CC
RS-
PIN/BUMP
R
OUT
GAIN
GAIN
) then develops across the external output resis-
= 40Ω FOR THE MAX9934T AND
= 200Ω FOR THE MAX9934F.
). See the Typical Operating Circuit .
µMAX
MAX9934
4, 5
1
2
3
8
7
6
G
m
GND
NAME
GND
OUT
N.C.
Detailed Description
V
RS+
RS-
CS
Functional Diagram
CC
OUT
Power Supply
Current Output. OUT provides an output current proportional to input V
external resistor (R
voltage for bidirectional sensing.
Ground
Sense Resistor Power Side Connection
Sense Resistor Load Side Connection
Chip-Select Input. Drive CS high to enable OUT, drive CS low to put OUT in a high-impedance
state.
No Connection. Not internally connected.
G
m
). An output voltage
*R
GAIN
OUT
SENSE
CS
OUT
) from OUT to GND for unidirectional sensing or to an external reference
)
achieve gain error of less than 0.25%. The precision V
specification allows accurate current measurements with
a low-value current-sense resistor, thus reducing power
dissipation in battery-powered systems, as well as load-
regulation issues in low-voltage DC power supplies.
The MAX9934 high-side current-sense amplifier fea-
tures a -0.1V to +5.5V input common-mode range that
is independent of supply voltage (V
sense at voltages beyond the supply rail allows the
monitoring of currents out of a power supply even in a
shorted condition, while also enabling high-side current
sensing at voltages greater than the MAX9934 supply
Figure 1. Output Settling Time
V
±1V STEP
OUT
V
1V
2V
SENSE
t
S
FUNCTION
% FINAL VALUE
Pin Description
SENSE
CC
. Connect an
). This ability to
% FINAL VALUE
Maxim Integrated
t
S
OS