MAX8934AETI+ Maxim Integrated Products, MAX8934AETI+ Datasheet - Page 15

• Manufacturer Part Number: MAX8934AETI+
• Description: IC BATTERY CHARGER DUAL 28TQFN
• Manufacturer: Maxim Integrated Products
• Series: Smart Power Selector™r

Specifications of MAX8934AETI+

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 4.1 V ~ 6.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Product: Charge Management
• Output Voltage: 1 V
• Operating Supply Voltage: 4.1 V to 6.6 V
• Supply Current: 1 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Charge Safety Timers: Yes
• Mounting Style: SMD/SMT
• Temperature Monitoring: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Dual-Input Linear Chargers, Smart Power Selector
18, 19
20, 21
23, 24
PIN
16
17
22
25
26
27
28
—
with Advanced Battery Temperature Monitoring
THMSW
NAME
BATT
CHG
LDO
DOK
UOK
USB
SYS
FLT
OT
EP
______________________________________________________________________________________
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.
Always-On Linear Regulator Output. LDO is the output of an internal always-on 3.3V LDO that provides
power to external circuitry. The LDO output provides up to 30mA of current for indicator LEDs or other
loads. LDO remains active even when only a battery is present, so that the thermistor monitor circuitry
can be activated when the battery is being discharged, and other circuitry can remain powered.
Connect a 1FF ceramic capacitor from LDO to GND.
USB Power Input. USB is capable of delivering up to 0.5A to SYS in the MAX8934A/MAX8934B/
MAX8934C/MAX8934E. The USB current limit is set with PEN2 and USUS. See Table 2a. In the
MAX8934D, USB is capable of delivering up to 1.5A to SYS. Both USB pins must be connected together
externally. Connect a 4.7FF ceramic capacitor from USB to GND.
Battery Connection. Connect the positive terminal of a single-cell Li+ battery to BATT. The battery
charges from SYS when a valid source is present at DC or USB. BATT powers SYS when neither DC nor
USB power is present, or when the SYS load exceeds the input current limit. Both BATT pins must be
connected together externally.
Charger Status Output. The CHG active-low, open-drain output pulls low when the battery is in fast
charge or prequal. Otherwise, CHG is high impedance.
System Supply Output. SYS is connected to BATT through an internal 40mI system load switch when
DC or USB are invalid, or when the SYS load is greater than the input current limit.
When a valid voltage is present at DC or USB, SYS is limited to 5.3V (MAX8934A) or 4.35V (MAX8934B/
MAX8934C/MAX8934D/MAX8934E). When the system load (I
SYS is regulated to 68mV below V
Bypass SYS to GND with a 10FF ceramic capacitor. Both SYS pins must be connected together
externally.
Battery Overtemperature Flag. The OT active-low, open-drain output pulls low when THMEN is high and
the battery temperature is R +75NC.
DC Power-OK Output. The DOK active-low, open-drain output pulls low when a valid input is detected
at DC.
USB Power-OK Output. The UOK active-low, open-drain output pulls low when a valid input is detected
at USB.
Fault Output. The FLT active-low, open-drain output pulls low when the battery timer expires before
prequal or fast charge complete.
Exposed Pad. Connect the exposed pad to GND. Connecting the exposed pad does not remove the
requirement for proper ground connections to the appropriate pins.
BATT
and both the input and the battery service the SYS load.
FUNCTION
Pin Description (continued)
SYS
) exceeds the DC or USB current limit,
15