MAX1259MJE Maxim Integrated, MAX1259MJE Datasheet - Page 6

• Manufacturer Part Number: MAX1259MJE
• Description: Battery Management
• Manufacturer: Maxim Integrated
• Series: MAX1259r

Specifications of MAX1259MJE

• Output Voltage: 3 V
• Output Current: 0.1 mA (Max)
• Operating Supply Voltage: 4.5 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Package / Case: CDIP N
• Mounting Style: Through Hole

To achieve rated performance, the V
connected to both V
the switched output should be connected to both V
pins (pins 12 and 13).
The power-fail ( PF ) output is high for V
1.26 x V
If V
and the backup battery is greater than 2V, the battery-
fail ( BF ) output will be held high, indicating a charged
battery. If the backup battery drops below 2V or V
falls below V
During normal operation, the BAT output stays at the
battery voltage, regardless of the V
vides 1mA battery current.
Battery Manager
6
Figure 4. Reset Timing
CCI
_______________________________________________________________________________________
is at or above the voltage trip threshold (V
BATT
TP
(V
, BF will be driven low.
TP
), indicating a valid V
CCI
pins (pins 15 and 16). As well,
V
RST
V
CCO
BAT
CCI
+3V
0V
+5V
+3V
+5V
0V
V
V
0V
IH
IL
CCI
CC
CCI
CCI
input should be
level. This pro-
Battery Fail
BAT Output
Power Fail
voltage.
greater than
CCO
CCI
TP
)
To prevent battery discharge during shipping, the back-
up battery can be disconnected from V
This disconnect feature is activated by pulsing the
reset (RST) input high for a minimum of 50ns with V
greater than V
removed, the V
impedance. The next time primary power is applied
with V
ation resumes. Note that when the MAX1259 is first
powered up, V
V
part is in normal V
If a protection diode is placed in series with the backup
battery, pin 2 must be bypassed with at least a 0.01µF
capacitor to ground.
BATT
HIGH IMPEDANCE
HIGH IMPEDANCE
50ns MIN
CCI
. This resets an internal flip-flop, ensuring that the
greater than 1.26 x V
TP
Applications Information
CCI
CCO
CC
(Figure 4). When primary power is
RESET (Digitally Controlled
must be brought above 1.26 x
mode and not in shipping mode.
and BAT outputs will go high
Battery Disconnect)
BATT
(V
CCO
TP
), normal oper-
to BAT.
CCI