BQ20Z45DBTR-R1 datasheet(7/18 Pages) TI

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bq20z45-R1

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SLUS992 – DECEMBER 2009

ELECTRICAL CHARACTERISTICS (continued)

over operating free-air temperature range (unless otherwise noted), TA = –40°C to 85°C, V(REG25) = 2.41 V to 2.59 V,

V(BAT) = 14 V, C(REG25) = 1 µF, C(REG33) = 2.2 µF; typical values at TA = 25°C (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

V(CHG): V(PACK) ≥ V(PACK) + 4V

400

1000

Rise time

CL= 4700 pF

μs

V(DSG): V(BAT) ≥ V(BAT) + 4V

400

1000

V(CHG): V(PACK) + V(CHGON) ≥ V(PACK)

200

+ 1V

Fall time

CL= 4700pF

μs

V(DSG): VC1 + V(DSGON) ≥ VC1 + 1V

200

V(ZVCHG)

ZVCHG clamp voltage

BAT = 4.5 V

3.3

3.5

3.7

LOGIC; TA = –40°C to 100°C (unless otherwise noted)

ALERT

100

200

R(PULLUP)

Internal pullup resistance

Ω

RESET

ALERT

0.2

VOL

Logic low output voltage level

RESET; V(BAT) = 7V; V(REG25) = 1.5 V; I (RESET) = 200 μA

0.4

GPOD; I(GPOD) = 50 μA

0.6

LOGIC SMBC, SMBD, PFIN, PRES, SAFE, ALERT

VIH

High-level input voltage

2.0

VIL

Low-level input voltage

0.8

VOH

Output voltage high(1)

IL = –0.5 mA

VREG25–0.5

VOL

Low-level output voltage

PRES, PFIN, ALERT, IL = 7 mA;

0.4

Input capacitance

I(SAFE)

SAFE source currents

SAFE active, SAFE = V(REG25) –0.6 V

–3

SAFE leakage current

SAFE inactive

–0.2

0.2

µA

Ilkg

Input leakage current

µA

ADC(2)

Input voltage range

TS1, TS2, using Internal Vref

–0.2

Conversion time

31.5

Resolution (no missing codes)

bits

Effective resolution

bits

Integral nonlinearity

±0.03

%FSR(3)

Offset error(4)

140

250

µV

Offset error drift(4)

TA = 25°C to 85°C

2.5

μV/°C

Full-scale error(5)

±0.1%

±0.7%

Full-scale error drift

PPM/°C

Effective input resistance(6)

Ω

COULOMB COUNTER

Input voltage range

–0.20

0.20

Conversion time

Single conversion

250

Effective resolution

Single conversion

bits

–0.1 V to 0.20 V

±0.007

±0.034

Integral nonlinearity

%FSR

–0.20 V to –0.1 V

±0.007

Offset error (7)

TA = 25°C to 85°C

µV

Offset error drift

0.4

0.7

µV/°C

Full-scale error(8) (9)

±0.35%

Full-scale error drift

150

PPM/°C

(1)

RC[0:7] bus

(2)

Unless otherwise specified, the specification limits are valid at all measurement speed modes

(3)

Full-scale reference

(4)

Post-calibration performance and no I/O changes during conversion with SRN as the ground reference

(5)

Uncalibrated performance. This gain error can be eliminated with external calibration.

(6)

The A/D input is a switched-capacitor input. Since the input is switched, the effective input resistance is a measure of the average

resistance.

(7)

Post-calibration performance

(8)

Reference voltage for the coulomb counter is typically Vref/3.969 at V(REG25) = 2.5 V, TA = 25°C.

(9)

Uncalibrated performance. This gain error can be eliminated with external calibration.

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