Electrical characteristics (continued) – Rainbow Electronics MAX8922L User Manual
Page 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
1
µF
LDO Regulated Output Voltage
I
LDO
= 10mA, V
IN
= 5V
4.8
4.94
V
LDO Output-Current Limit
100
mA
EN/SET
Rising
1.4
Logic Input Thresholds
Falling
0.4
V
Program Lock Time
4
ms
Shutdown Delay
V
IN
= 5V, EN/SET from low to high
4
ms
t
LOW
(Note 4)
100
1400
t
HIGH
(Note 4)
100
1400
µs
Pulldown Resistor
2
M
Ω
POK, CHG
Logic Output Voltage, Low
I
POK,
= I
CHG
= 5mA
0.05
0.2
V
T
A
= +25°C
0.001
1
Logic Output Current, High
V
POK
= V
CHG
= 5.5V, V
IN
= 0V
T
A
= +85°C
0.01
µA
CHG
Default top-off threshold, hysteresis
(typ) = 80mA
60
80
100
EN/SET = one pulse, R
MIN
=
1.875k
Ω, hysteresis (typ) = 130mA
60
80
100
Top-Off Threshold
I
BAT
falling,
battery is
charged
EN/SET = two pulses, hysteresis
(typ) = 22mA
50
60
70
mA
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
J
rising
+105
°C
Thermal-Limit Gain
Reduction of I
BAT
for increase of T
J
, default mode
-28
mA/°C
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 5V, V
BAT
= 4V, V
EN/SET
= 0V, T
A
= -40°C to +85°C, typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
Note 1: Limits are 100% production tested at T
A
= +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
IN
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
A
= +25°C. Not for continuous charge current.
Note 4: Not tested. Design guidance only.