MAX8934GETI+ Maxim Integrated Products, MAX8934GETI+ Datasheet - Page 12

• Manufacturer Part Number: MAX8934GETI+
• Description: IC LI BATT CHARGER DUAL 28TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX8934GETI+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
12
9, 13
PIN
2, 3
10
11
12
14
15
16
1
4
5
6
7
8
_____________________________________________________________________________________
THMSW
THMEN
NAME
DONE
USUS
PEN1
PEN2
PSET
GND
CEN
ISET
THM
DC
CT
V
L
Charge Complete Output. The DONE active-low, open-drain output pulls low when the charger enters
the DONE state. The charger current = 0mA when DONE is low. See Figure 7.
DC Power Input. DC is capable of delivering up to 2A to SYS. DC supports both AC adapter and USB
inputs. The DC current limit is set with PEN1, PEN2, and R
connected together externally. Connect a 10FF ceramic capacitor from DC to GND. The DC inputs should
be grounded if not used.
Active-Low Charger Enable Input. Connect CEN to GND or drive low with a logic signal to enable
battery charging when a valid source is connected at DC or USB. Drive high with a logic signal to
disable battery charging.
Input Limit Control 1. See Table 2 for complete information.
Input Limit Control 2. See Table 2 for complete information.
DC Input Current-Limit Setting. Connect a resistor from PSET to GND to program the DC current limit up
to 2A (3000V/R
Internal Logic LDO Output Bypass Pin. Provides 3.3V when DC or USB is present. Connect a 0.1FF
ceramic capacitor from V
external load.
Ground. Both GND pins must be connected together externally.
Charge Timer Program Input. A capacitor from CT to GND sets the maximum prequal and fast-charge
timers. Connect CT to GND to disable the timer.
Charge Current-Limit Setting. A resistor (R
current up to 1.5A (3000V/R
current.
USB Suspend Digital Input. As shown in Table 2, driving USUS high suspends the DC or USB inputs if
they are configured as a USB power input.
Thermistor Input. Connect a negative temperature coefficient (NTC) thermistor with good thermal
contact with the battery from THM to GND. Use a thermistor with Beta = 3964. Connect a resistor
of equal resistance to the thermistor resistance at +25°C from THM to THMSW so that the battery
temperature can be monitored, and the fast-charge current and/or the charge termination voltage is
automatically adjusted, in accordance with safety region 2 of the JEITA specification.
Thermistor Enable Input. THMEN controls THMSW by connecting the external thermistor pullup resistor
and the thermistor monitoring circuit to LDO. Drive THMEN high to enable the thermistor circuit in
discharge mode and to connect the external thermistor pullup resistor. Drive THMEN low to disconnect
the external thermistor pullup resistor and to disable the thermistor monitoring circuit to conserve
battery energy when not charging.
Thermistor Pullup Supply Switch. Drive THMEN high to enable the THMSW, shorting the THMSW output
to LDO. Drive THMEN low to open the THMSW switch. THMSW is always on when a valid input source
is present and the battery is being charged. When no input source is present, THMSW is controlled by
THMEN. THMSW is also active when the battery is being discharged, so that the battery temperature
can be monitored for an overtemperature condition.
PSET
).
L
to GND. V
ISET
). The prequal charge current is 20% of the set fast-charge charge
L
powers the internal circuitry and provides up to 5mA to an
ISET
FUNCTION
) from ISET to GND programs the fast-charge charge
PSET
. See Table 2. Both DC pins must be
Pin Description