DS2711Z datasheet(4/15 Pages) MAXIM

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DS2711/DS2712: Loose Cell NiMH Charger

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PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Duty Factor, Parallel

Precharge/Top-Off

CC1, CC2

0.125

Duty Factor, Maintenance

Charge

CC1, CC2

0.0156

Cell Test Interval

tCTST

Precharge Time-Out

tPCHG

VCELL < VBAT-MIN

minutes

Fast-Charge Termination

Hold-Off Period

tTHO

minutes

Fast-Charge Flat Voltage

Time-Out

tFLAT

VCELL not increasing

minutes

Charge Timer Period

tCTMR

RTMR = 100kΩ

2.5

Charge Timer Accuracy

RTMR = 100kΩ

-5

Charge Timer Range

tCTMR-RANGE

0.5

Note 1:

Voltages relative to VSS.

Note 2:

IMTST current is applied as a source current and as a sink current within 5ms after power-up.

Note 3:

When operating in two-cell-series charge configuration, the DMSEL pin must have less than 50pF of external load capacitance

for proper operation. If the load capacitance is greater than 50pF, a resistor voltage divider should be used to maintain DMSEL

at VDD / 2.

Note 4:

Specification applicable during charge cycle with TA = 0°C to +70°C.

Note 5:

VBAT-MAX1 and VBAT-MAX1 are generated from the same reference. Their ranges never overlap.

Note 6:

VTHM-MIN, VTHM-MAX, and VTHM-STOP are fixed ratios of VDD. Their ranges never overlap.

Note 7:

Tested with ICSOUT = -1mA.

Note 8:

Gain tested with 1mV step with ICSOUT = -1mA.

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