high and the DISCON pin is set to its high-impedance

state. After 130ms, the DRV pin is pulled low by the

MAX1906, exiting the test mode. The time period of

130ms has been chosen not to stress the three-terminal

protection fuse if an external MOSFET is used to blow the

fuse. The OUT pin is not affected by the test mode. See

the timing diagram for the test mode in Figure 7.

Entry into test mode is ignored if the MAX1906 has

detected an overvoltage condition and has activated

the 2.1s delay. Test mode remains disabled until the

MAX1906 exits the overvoltage condition. The

MAX1906 continues normal operation upon exit from

the test mode.

Li+ Battery-Pack Protector with

Integrated Fuse Driver

_______________________________________________________________________________________

9

0.8ms

2.56s

2.1s

0.8ms

300

µA

3.2

µA

STOP SAMPLING AND MONITOR ONLY

CELL UNDER MEASUREMENT

4.8V

NOTE: ALL VALUES ARE TYPICAL.

Figure 6. Current Consumption of Chip in Different States

50

IF ALL CELLS ARE TESTED TO BE IN

OVERVOLTAGE CONDITION

0.8ms

130ms

Figure 7. Timing Diagram for Test Mode