Complete Backup-Management ICs

for Lithium and NiMH Batteries

4

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ELECTRICAL CHARACTERISTICS

R5 = 250k

PARAMETER

CONDITIONS

MIN

MAX

UNITS

IN Voltage Range

2.8

5.5

V

IN Operating Current

Charger on, not including charge current

90

µA

CHGI Current Limit

8

12

mA

CHGI Resistor Range

50

1800

k

Ω

4.116

4.310

3.420

3.605

BK Charge Voltage Limit

1.746

1.854

V

NiMH Mode BK High Threshold Voltage,

1.37

1.43

V

NiMH Mode BK Low Threshold Voltage,

1.17

1.23

V

REF Output Voltage

1.225

1.275

V

REF Load Regulation

10

mV

REF Line Regulation

7

mV

2.38

2.48

INOK Threshold Voltage

2.40

2.54

V

NI/LI Logic-Level High

1.8

V

NI/LI Logic-Level Low

0.4

V

OD_ On-Resistance

30

Ω

BACKUP STEP-UP (Note 2)

BK Input Undervoltage Lockout

1.05

1.21

V

BK Input Voltage

5.5

V

Quiescent Current into BKSU

25

µA

Quiescent Current into BK

4

µA

BKV Feedback Voltage

1.162

1.258

V

3.17

3.43

BKSU Output-Voltage Accuracy

2.4

2.6

V

BKSU Output Voltage Range

2.5

5.0

V

n-Channel Switch On-Resistance

1

Ω

p-Channel Switch On-Resistance

2

Ω