MAX1874EVKIT データシートの表示（PDF） - Maxim Integrated

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MAX1874EVKIT

MAX1874 Evaluation Kit

Maxim Integrated 

MAX1874 Evaluation Kit

Evaluating Other DC Input Fast-

Charge Currents (IBATT)

The MAX1874 EV kit is preset with a DC input fast-

charge current (IBATT) of 750mA. Taking the shunt OFF

jumper JU4 changes IBATT to 1A. However, IBATT can

also be resistor-programmed by placing the shunt ON

jumper JU4 and changing the R5 and R6 resistors

using the equation below:

IBATT = (R6 / (R5 + R6)) A

Allowing USB to Power

the System Load

The MAX1874 EV kit is shipped with Q1 and D1 not

installed. To allow the USB to power the system load,

install a P-channel MOSFET such as the Fairchild

FDN302P, and a Schottky diode, such as the Fairchild

MBR0520L, on the Q1 and D1 pads, respectively, of the

MAX1874 EV kit board.

Using Thermistor Sensing

The MAX1874 EV kit is preset with thermistor sensing

disabled through jumper JU3. Removing jumper JU3

and installing a 10kΩ ±1% resistor for R4 allows an NTC-

type thermistor (10kΩ at +25°C) to be used. The thermis-

tor must be located in close proximity to the single-cell

Li+ battery with the ungrounded end connected to the

THRM pad of the MAX1874 EV kit board. Charging is

interrupted when the cold temperature limit is reached,

which typically occurs at VTHRM ≥ 2.22V. Charging also

is interrupted when the hot temperature limit is reached,

which typically occurs at VTHRM ≤ 0.87V.

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