LP3921 Datasheet, PDF (8/41 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
General Electrical Characteristics
Unless otherwise noted, V_IN (=VIN1=VIN2=BATT=VDD) = 3.6V, GND = 0V, C_VIN1-2=10 µF, C_LDOX=1 µF. 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 = −40°C to +125°C. ⁽¹⁾
Symbol
Parameter
Condition
Limit
Typ
Units
Min
Max
I_Q(STANDBY)
Standby Supply
Current
V_IN = 3.6V, UVLO on, internal logic
circuit on, all other circuits off
2
5
µA
POWER MONITOR FUNCTIONS
Battery Under-Voltage Lockout
V_UVLO-R
Under Voltage Lock- V_IN Rising
out
2.85
2.7
3.0
V
THERMAL SHUTDOWN
Higher Threshold
(2)
160
°C
LOGIC AND CONTROL INPUTS
V_IL
Input Low Level
PS_HOLD, SDA, SCL, RX_EN,
TCXO_EN, TX_EN ⁽²⁾
PWR_ON, HF_PWR
(2)
V_IH
Input High Level
PS_HOLD, SDA, SCL, RX_EN,
TCXO_EN, TX_EN
(2)
0.25*
V
V_LDO2
0.25*
V
V_BATT
0.75*
V
V_LDO2
PWR_ON, HF_PWR
(2)
I_IL
Logic Input Current All logic inputs except PWR_ON
and HF_PWR
0.75*
V
V_BATT
-5
+5
µA
0V ≤ V_INPUT ≤ V_BATT
R_IN
Input Resistance
PWR_ON, HF_PWR Pull-Down
500
kΩ
resistance to GND
LOGIC AND CONTROL OUTPUTS
V_OL
Output Low Level
PON_N, RESET_N, SDA,
ACOK_N
0.25*
V
I_OUT = 2 mA
V_OH
Output High Level PON_N, RESET_N, ACOK_N
I_OUT = -2 mA
(Not applicable to Open Drain
Output SDA)
V_LDO2
0.75*
V
V_LDO2
(1) All limits are verified. All electrical characteristics having room-temperature limits are tested during production with T_J = 25°C. All hot and
cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying statistical process
control.
(2) Specified by design.
LDO1 (CORE) Electrical Characteristics
Unless otherwise noted, V_IN (=VIN1=VIN2=BATT=VDD) = 3.6V, GND = 0V, C_VIN1-2=10 µF, C_LDOX=1 µF. Note V_INMIN is the
greater of 3.0V or V_OUT1+ 0.5V. 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 = −40°C to +125°C. ⁽¹⁾
Symbol
Parameter
Condition
Limit
Typ
Units
Min
Max
V_OUT1
Output Voltage
Accuracy
I_OUT1 = 1 mA, V_OUT1= 3.0V
−2
+2
%
−3
+3
Output Voltage
Default
1.8
V
(1) All limits are verified. All electrical characteristics having room-temperature limits are tested during production with T_J = 25°C. All hot and
cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying statistical process
control.
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