bq24120, bq24123, bq24125

SLUS688H – MARCH 2006 – REVISED NOVEMBER 2015

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Electrical Characteristics (continued)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

PWM

7 V

400

Internal P-channel MOSFET on-resistance

4.5 V

500

m

Ω

7 V

130

Internal N-channel MOSFET on-resistance

4.5 V

150

Oscillator frequency

1.1

MHz

Frequency accuracy

–9%

9%

Maximum duty cycle

100%

Minimum duty cycle

0%

Switching delay time (dead time)

20

ns

Minimum synchronous FET on time

60

ns

Synchronous FET minimum current-off

50

400

mA

BATTERY DETECTION

Battery detection current during time-out

2

mA

fault

Discharge current

400

μA

Discharge time

1

s

Wake current

2

mA

Wake time

0.5

s

Begins after termination detected,

Termination discharge current

400

μA

Termination time

262

ms

OUTPUT CAPACITOR

Required output ceramic capacitor range

from SNS to PGND, between inductor and

4.7

10

47

μF

Required SNS capacitor (ceramic) at SNS

0.1

μF

pin

PROTECTION

OVP threshold voltage

MOSFET, STAT1, and STAT2 during charge

110

117

121

or termination states

Cycle-by-cycle current limit

2.6

3.6

4.5

A

Short-circuit voltage threshold, BAT

1.95

2

2.05

V/cell

Short-circuit current

35

65

mA

Thermal trip

165

°C

Thermal hysteresis

10

(3)

N-channel always turns on for approximately 60 ns and then turns off if current is too low.

7.6 Dissipation Ratings

DERATING FACTOR

PACKAGE

POWER RATING

46.87°C/W

2.15°C/W

1.81 W

0.021 W/°C

(1)

This data is based on using the JEDEC High-K board, and the exposed die pad is connected to a copper pad on the board. This is

connected to the ground plane by a 2x3 via matrix.

8

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