MAX1874ETE Maxim Integrated Products, MAX1874ETE Datasheet - Page 8

• Manufacturer Part Number: MAX1874ETE
• Description: Battery Management Dual-Input USB/AC Adapter 1-Cell Li+
• Manufacturer: Maxim Integrated Products

Specifications of MAX1874ETE

• Battery Type: Li-Ion, Li-Polymer
• Operating Supply Voltage: 4.35 V to 6.5 V
• Supply Current: 4 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Package / Case: TQFN-16
• Charge Safety Timers: No
• Mounting Style: SMD/SMT
• Temperature Monitoring: No

Dual-Input, USB/AC Adapter, 1-Cell
Li+ Charger with OVP and Thermal Regulation
8
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PIN
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
NAME
DCOK
THRM
PGND
DCLV
USEL
BATT
CHG
GND
UOK
USB
PON
BYP
DCI
REF
DC
EN
Low-Voltage Charger Input. DCLV charges BATT through an internal MOSFET. Maximum operating
voltage at this pin is 6.0V. When an overvoltage protection MOSFET is connected, DCLV is connected to
DC when the input voltage is suitable for charging.
Voltage-Sense Pin for DC Input from AC Adapter. Maximum operating voltage at this pin is 18V.
CHG is an active-low, open-drain output that goes low when the MAX1874 is charging and goes high
when both of the following conditions are met (see the Battery Full ( CHG ) section):
USEL is a logic input that sets USB source charging current to 500mA when USEL is logic high and to
100mA when USEL is logic low.
Enable/Disable Input. Drive EN high to enable the device. When EN is low, UOK, DCOK, PON, and REF
remain active.
Ground
The voltage at this input sets the fast-charge current when the DCLV input is powering the charger. See
the Charging Current section.
THRM pauses charging when an externally connected thermistor (10kΩ at +25°C) is at less than 0°C or
greater than +50°C. Connect to GND to disable. See the External Thermistor Monitor (THRM) section.
3V Reference Output. Sources up to 500µA to bias I
GND. REF loading does not affect BATT regulation accuracy.
Power Ground. Connect to GND at a single, low-impedance point.
BYP powers internal circuitry and switches to the active input (either DCLV or USB). Bypass with a 2.2µF
capacitor to GND.
USB Charger Input. Charges BATT through an internal MOSFET.
UOK is an active-low, open-drain output that goes low to indicate when the USB input is the valid
charging source.
PON is an active-high, open-drain output with an internal 120kΩ resistor to ground that goes high when
V
system load when power is applied.
Charge Output. Connect to the positive terminal of the Li+ battery.
DCOK is an active-low, open-drain output that goes low when 3.5V < V
DC
1) Charge current drops to a set threshold (Table 2).
2) The charger is in voltage mode.
or V
USB
> V
BATT
. PON can directly drive an external PFET that disconnects the battery from the
FUNCTION
DCI
and external thermistor. Bypass with 0.1µF to
DC
< 6.2V.
Pin Description