LP3921 Datasheet, PDF (12/41 Pages) National Semiconductor (TI) – Battery Charger Management and Regulator Unit with Integrated Boomer® Audio Amplifier

LP3921
SNVS580A – AUGUST 2008 – REVISED MAY 2013
www.ti.com
Charger Electrical Characteristics (continued)
Unless otherwise noted, V_CHG-IN = 5V, V_IN (=VIN1=VIN2=BATT=VDD) = 3.6V.C_{CHG_IN} = 10 µF. Charger set to default settings
unless otherwise noted. Typical values and limits appearing in normal type apply for T_J = 25°C. Limits appearing in boldface
type apply over the entire junction temperature range for operation, T_A = T_J = −25°C to +85°C. ⁽¹⁾⁽²⁾
Symbol
Parameter
Condition
Limit
Typ
Units
Min
Max
V_TERM
Battery Charge Termination
voltage
Default
4.2
V
I_CHG
V_TERM voltage tolerance
T_J = 0°C to 85°C
Fast Charge Current Accuracy I_CHG = 450 mA
Programmable full-rate charge 6.0V ≥ V_{CHG_IN} ≥ 4.5V
current range (default 100 mA) _{VBATT < (VCHG_IN - VOK_CHG)}
V_{FULL_RATE} < V_BATT < V_TERM
(4)
-1
+1
%
-10
+10
%
50
950
mA
Default
100
Charge current programming
50
step
I_PREQUAL
I_{CHG_USB}
Pre-qualification current
CHG_IN programmable
current in USB mode
V_BATT = 2V
5.5V ≥ V_{CHG_IN} ≥
4.5V
Low
V_BATT < (V_{CHG_IN}
- V_{OK_CHG})
V_{FULL_RATE} <
V_BATT < V_TERM
Default = 100 mA
High
50
40
100
450
100
60
mA
mA
V_{FULL_RATE}
Full-rate qualification threshold V_BATT rising, transition from pre-qual to full-rate
3
charging
2.9
3.1
V
I_EOC
End of Charge Current, % of 0.1C option selected
full-rate current
10
%
V_RESTART
Restart threshold voltage
V_BATT falling, transition from EOC to full-rate
4.05
3.97
4.13
charge mode. Default options selected - 4.05V
V
I_MON
I_MON Voltage 1
I_MON Voltage 2
T_REG
Regulated junction
temperature
Detection and Timing⁽⁵⁾
I_CHG = 100 mA
I_CHG = 450 mA
(5)
0.247
V
1.112 0.947 1.277
115
°C
T_POK
Power OK deglitch time
V_BATT < (V_CC - V_{OK_CHG})
32
mS
T_{PQ_FULL}
Deglitch time
Pre-qualification to full-rate charge transition
230
mS
T_CHG
Charge timer
Precharge mode
1
Hrs
Charging Timeout
5
T_EOC
Deglitch time for end-of-
charge transition
230
mS
(4) Full-charge current is specified for CHG_IN = 4.5 to 6.0V. At higher input voltages, increased power dissipation may cause the thermal
regulation to limit the current to a safe level, resulting in longer charging time.
(5) Specified by design.
12
Submit Documentation Feedback
Product Folder Links: LP3921
Copyright © 2008–2013, Texas Instruments Incorporated