Rainbow-electronics MAX8922L Manual do Utilizador descarregar pdf (Página 3)

MAX8922L

30V Li+ Linear Battery Charger

with GSM Test Mode in 3mm x 2mm TDFN

_______________________________________________________________________________________ 3

PARAMETER CONDITIONS MIN TYP MAX UNITS

LDO

Minimum LDO Bypass

Capacitance

1µF

LDO Regulated Output Voltage I

LDO

= 10mA, V

= 5V 4.8 4.94 V

LDO Output-Current Limit 100 mA

EN/SET

Rising 1.4

Logic Input Thresholds

Falling 0.4

Program Lock Time 4ms

Shutdown Delay V

= 5V, EN/SET from low to high 4 ms

LOW

(Note 4) 100 1400

HIGH

(Note 4) 100 1400

µs

Pulldown Resistor 2MΩ

POK, CHG

Logic Output Voltage, Low I

POK,

= I

CHG

= 5mA 0.05 0.2 V

= +25°C 0.001 1

Logic Output Current, High V

POK

= V

CHG

= 5.5V, V

= 0V

= +85°C 0.01

µA

CHG

Default top-off threshold, hysteresis

(typ) = 80mA

60 80 100

EN/SET = one pulse, R

MIN

1.875kΩ, hysteresis (typ) = 130mA

60 80 100

Top-Off Threshold

BAT

falling,

battery is

charged

EN/SET = two pulses, hysteresis

(typ) = 22mA

50 60 70

Detection Delay I

BAT

falls below top-off threshold 2 4 6 ms

THERMAL LOOP

Thermal-Limit Temperature

Junction temperature when the charge current is

reduced, T

rising

+105 °C

Thermal-Limit Gain Reduction of I

BAT

for increase of T

, default mode -28 mA/°C

ELECTRICAL CHARACTERISTICS (continued)

= 5V, V

BAT

= 4V, V

EN/SET

= 0V, T

= -40°C to +85°C, typical values are at T

= +25°C, unless otherwise noted.) (Note 1)

Note 1: Limits are 100% production tested at T

= +25°C. Limits over the operating temperature range are guaranteed by design

and characterization.

Note 2: Guaranteed by undervoltage- and overvoltage-threshold testing. If V

BAT

= 4.2V, V

needs to be > 4.2V + 250mV (typ) to

start normal operation. After the MAX8922L turns on, it can operate until V

BAT

+ 100mV (typ). For complete charging, the

input voltage must be > 4.45V. See the

Input Sources

section.

Note 3: Used for factory GSM RF calibration. 217Hz, 12.5% current pulse, T

= +25°C. Not for continuous charge current.

Note 4: Not tested. Design guidance only.

1 2 3 4 5 6 7 8 ... 13 14

MAX8922L 1

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