MAX1782ETM+C8F Maxim Integrated, MAX1782ETM+C8F Datasheet - Page 7

• Manufacturer Part Number: MAX1782ETM+C8F
• Description: Battery Management Adv Smart Battery Pack Controller
• Manufacturer: Maxim Integrated
• Series: MAX1782r

Specifications of MAX1782ETM+C8F

• Rohs: yes

Figure 2. State Machine
FET are the minimum drain-source breakdown voltage
and the minimum turn-on threshold voltage (V
Power dissipation during fast charge is approximately
R
the input power source. The minimum breakdown volt-
age (BV
open-circuit voltage. An even larger margin may be
necessary if the wall adapter has especially poor tran-
sient response. The MAX1736 can operate with input
voltages up to 22V.
Bypass BATT with at least 1.5µF per amp of charge
current. If the battery is removed while the P-channel
MOSFET is on, a BATT voltage over 5V is quickly
sensed, and the FET is immediately turned off. In appli-
cations where the cell is removable, very large capaci-
tance values may increase transient currents when the
cell is replaced. Therefore, BATT capacitance in
excess of 100µF should be avoided. For best system
performance with large output capacitance, at least
DSON
✕
DS
I
CHG
) must typically be two times the wall cube’s
2
, where I
_______________________________________________________________________________________
SOT23, Single-Cell Li+ Battery Charger
CHG
CYCLE
EVERY
(FROM ANY STATE)
POWER REMOVED
TOP-OFF QUAL
FET: PULSED
SHUTDOWN
is the current limit set by
CHARGER
FET: OFF
FET: OFF
TOP-OFF
BATT Capacitor
CHARGER
POWER
PRESENT
V
CHARGER
PRESENT
BATT
POWER
> 4.2V
DETECTION
INTERVAL
GS
for Current-Limited Supply
IN
FAST-CHARGE QUAL
(FROM ANY STATE)
).
FAST-CHARGE
DISABLED
FET: OFF
FET: OFF
FET: ON
EN
0.47µF of the total capacitance should be low-ESR
ceramic.
Most applications will use the circuit of Figure 3 with
C
C
down current sources act to slow the switching of the P-
channel MOSFET. This prevents a wall cube with poor
transient response from subjecting V
voltage when the P-channel MOSFET turns off, and pre-
vents excessive current into the battery when the P-
channel MOSFET turns on. Excessive voltage at V
can potentially damage the IC, input capacitor, and the
PMOS switch. Excessive current into the battery can
cause errors in the termination process of the MAX1736
(by raising the instantaneous battery voltage) and may
trip the battery’s protection circuitry.
In applications utilizing a wall cube with poor transient
response, increase the value of C
GATE
GATE
CHARGER
POWER
PRESENT
, R
= 0.22µF, R
GATE
EN
, and the internal 100µA pull-up and pull-
GATE
PRECHARGE
I
OUT
FET: OFF
= -6mA
= 100kΩ, and C
GATE
C
CT
IN
CT
as needed to
and C
to excessive
= 0.33µF.
GATE
IN
7