MAX1874(2003) データシートの表示（PDF） - Maxim Integrated

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MAX1874
(Rev.:2003)

Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal Regulation

Maxim Integrated 

Dual-Input, USB/AC Adapter, 1-Cell

Li+ Charger with OVP and Thermal Regulation

Pin Description

PIN

NAME

FUNCTION

Low-Voltage Charger Input. DCLV charges BATT through an internal MOSFET. Maximum operating

1

DCLV 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.

2

DC

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

3

CHG

when both of the following conditions are met (see the Battery Full (CHG) section):

1) Charge current drops to a set threshold (Table 2).

2) The charger is in voltage mode.

4

USEL

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.

5

EN

Enable/Disable Input. Drive EN high to enable the device. When EN is low, UOK, DCOK, PON, and REF

remain active.

6

GND Ground

7

DCI

The voltage at this input sets the fast-charge current when the DCLV input is powering the charger. See

the Charging Current section.

8

THRM

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.

9

REF

3V Reference Output. Sources up to 500µA to bias IDCI and external thermistor. Bypass with 0.1µF to

GND. REF loading does not affect BATT regulation accuracy.

10

PGND Power Ground. Connect to GND at a single, low-impedance point.

11

BYP

BYP powers internal circuitry and switches to the active input (either DCLV or USB). Bypass with a 2.2µF

capacitor to GND.

12

USB USB Charger Input. Charges BATT through an internal MOSFET.

13

UOK

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

14

PON VDC or VUSB > VBATT. PON can directly drive an external PFET that disconnects the battery from the

system load when power is applied.

15

BATT Charge Output. Connect to the positive terminal of the Li+ battery.

16

DCOK DCOK is an active-low, open-drain output that goes low when 3.5V < VDC < 6.2V.

8 _______________________________________________________________________________________

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