Datasheet

Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
MAX4069
RS+
RS-
GSEL
SHDN
2.7V TO 24V
V
CC
OUT TO ADC
R1
R2
SHUTDOWN
GAIN SELECT
R
SENSE
LOAD
FROM BATTERY
CHARGER
REFOUT
OA
ADJ
GND
V
REF
1.23V
CSA
Functional Diagram
Pin Description
PIN
MAX4069
MAX4070/
MAX4071
MAX4072
NAME FUNCTION
111SHDN
Shutdown Input. Drive SHDN low to select shutdown mode. Connect SHDN
to V
CC
for normal operation.
2 2 2 RS- Negative Connection to the External Sense Resistor
3 3 3 RS+ Positive Connection to the External Sense Resistor
4 — — N.C. No Connection. Not internally connected.
5 4 4 GND
Ground. For thin QFN packages, also make an external connection from
GND to the under-side exposed paddle.
6 — — ADJ
Adjustable Output Voltage Feedback Input. Connect a resistor-divider
between REFOUT, ADJ, and GND (MAX4069 only, see Functional Diagram).
7 5 — REFOUT Reference Output Voltage (MAX4069/MAX4070/MAX4071)
8 6 6 OUT
Voltage Output. The difference voltage, V
OUT
- V
REF
, is proportional to
the voltage difference between RS+ and RS- and indicates the correct
polarity.
977V
CC
Supply Voltage Input. Bypass V
CC
to GND with a 0.1µF capacitor.
10 8 8 GSEL
Gain-Setting Input. Connect GSEL low to select gain = 50V/V, or connect
GSEL high to select gain = 100V/V.
— — 5 REFIN Reference Input Voltage (MAX4072)
MAX4069–MAX4072
Maxim Integrated
9