MAX1501 查看數據表（PDF） - Maxim Integrated

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MAX1501

Highly Integrated, Linear Battery Charger with Thermal Regulation for Portable Applications

Maxim Integrated 

MAX1501

Highly Integrated, Linear Battery Charger with

Thermal Regulation for Portable Applications

Table 2. Battery Regulation Voltage

CHARGING MODE

SELV

GND

VL

Li+

4.1V

4.2V

NiMH/NiCd

4.5V

4.95V

Li+ Charge Mode

Connect CHGEN and MODE to GND to place the

MAX1501 in Li+ charging mode. The Li+ charger con-

sists of a voltage-control loop, a current-control loop,

and a thermal-control loop. Connect SELV to GND to

set the Li+ battery voltage to 4.1V. Connect SELV to VL

to set the Li+ battery voltage to 4.2V (Table 2).

The MAX1501 precharges the Li+ battery with 10% of

the user-programmed fast-charge current at the start of

a charge cycle. A soft-start algorithm ramps up the

charging current (10% steps with 20ms duration per

step) to the fast-charge current when the battery volt-

age reaches 2.8V. The MAX1501 enters constant-volt-

age mode and decreases the charge current when the

BATT voltage reaches the selected regulation voltage

(4.1V or 4.2V). Set the fast-charge current with a resis-

tor between SETI and GND (see the Charge-Current

Selection section).

The thermal-regulation loop limits the MAX1501 die

temperature to the value selected by the TEMP input by

reducing the charge current as necessary (see the

Thermal-Regulation Selection section). This feature not

only protects the MAX1501 from overheating, but also

allows the charge current to be set higher without

risking damage to the system.

Set the top-off-current threshold with the three-state

FULLI input (see the Top-Off-Current Selection section).

RLED goes high impedance and GLED asserts low when

the top-off-current threshold is reached. The MAX1501

automatically initiates recharging when the battery volt-

age drops below 95% of the voltage set by SELV. (The

MAX1501Z does not time out.)

NiMH/NiCd Charge Mode

Connect MODE to VL to place the MAX1501 in

NiMH/NiCd charging mode. NiMH/NiCd mode uses only

current- and voltage-control loops, and is intended for

trickle- or timer-based chargers. Fast charge termination

schemes, such as negative ΔV or ΔT, are not included in

the MAX1501 but can be implemented using an external

microcontroller. Trickle- or timer-based chargers should

connect SELV to GND to set the regulation voltage to

4.5V. µP controlled chargers should connect SELV to VL

REGULATION VOLTAGE PREQUALIFICATION

FAST-CHARGE CURRENT

FAST CHARGING

MINIMUM CHARGE VOLTAGE

(2.8V)

10% OF FAST-CHARGE CURRENT

tPREQUAL

BATTERY

VOLTAGE

tMAX

TOP-OFF

DONE

BATTERY

CURRENT

RLED TURNS OFF AND GLED

TURNS ON WHEN CHARGE CURRENT

DROPS TO VALUE SET BY FULLI

(10%, 20%, OR 30% OF FAST-

CHARGE CURRENT).

CHARGE

TERMINATED

MAX1501Z

MAX1501

Figure 4. Li+ Charge Sequence

Maxim Integrated

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