Rainbow Electronics MAX16913A - Manual (Page 8)

MAX16913/MAX16913A
Remote Antenna Current-Sense
Amplifier and Switches
8 _______________________________________________________________________________________
Undervoltage and Overvoltage Lockout
The MAX16913/MAX16913A include undervoltage cir-
cuitry (UVLO) to prevent erroneous switch operation
when the input voltage goes below approximately
4.25V during startup and brownout conditions. Input
voltages of less than 4.25V inhibit operation of the
device by turning off the internal charge pump and the
switch. These devices also feature an overvoltage lock-
out (OVLO) threshold of +21V (typ). When V
IN
is
greater than V OVLO , the device immediately turns off
the switch and the internal charge pump.
Internal Reference
The MAX16913/MAX16913A feature a +3V bandgap
reference output, stable over supply voltage and tem-
perature. For the MAX16913A, the reference output is
connected to the resistive divider which sets the open-
load threshold. The output impedance of the internal
reference is 5kΩ (typ).
RETRY
t RETRY t BLANK
TURN-ON WITH A HEAVY LOAD
LOAD CURRENT
2 x I SC
I SC
SHDN
SC
RETRY
t RETRY t BLANK
TURN-ON INTO A TEMPORARY HEAVY LOAD
LOAD CURRENT
2 x I SC
I SC
SHDN
SC
Figure 2. Overcurrent Timing Diagram
Table 1. Status Truth Table
SC OL
V AOUT DEVICE STATUS
0 0 0.4V OUT Short-to-Battery
0 1 C ycl i ng Whi l e Autor etr yi ng Short-Circuit Condition
1 0 0.4V Open-Load Condition
1 1 (V
IN
- V
SENS
) x 13 + 0.4V Normal Operation