LP3921 Datasheet, PDF (10/41 Pages) National Semiconductor (TI) – Battery Charger Management and Regulator Unit with Integrated Boomer® Audio Amplifier

LP3921
SNVS580A – AUGUST 2008 – REVISED MAY 2013
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LDO2 (DIGI) Electrical Characteristics (continued)
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_OUT2+ 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
t_START-UP
Start-Up Time from C_OUT = 1 µF, I_OUT2 = 300 mA ⁽³⁾
40
Shutdown
60
µs
t_Transient
Start-Up Transient
C_OUT = 1 µF, I_OUT2 = 300 mA ⁽³⁾
5
Overshoot
30
mV
LDO3 (ANA), LDO4 (TCXO) Electrical Characteristics
Unless otherwise noted, V_IN (=VIN1=VIN2=BATT=VDD) = 3.6V, GND = 0V, C_VIN1-2=10 µF, C_LDOX=1 µF. TCXO_EN high. Note
V_INMIN is the greater of 3.0V or V_OUT3/4 + 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_OUT3, V_OUT4
Output Voltage
Accuracy
I_OUT3/4 = 1 mA, V_OUT3/4= 3.0V
−2
+2
%
−3
+3
Output Voltage
LDO3 default
3
V
LDO4 default
3
I_OUT3, I_OUT4
Output Current
V_INMIN ≤ V_IN ≤ 5.5V
Output Current Limit V_OUT3/4 = 0V
160
V_DO3, V_DO4
Dropout Voltage
I_OUT3/4 = 80 mA ⁽²⁾
220
ΔV_OUT3 , ΔV_OUT4 Line Regulation
V_INMIN ≤ V_IN ≤ 5.5V
2
I_OUT3/4 = 1 mA
Load Regulation
1mA≤ I_OUT3/4 ≤ 80 mA
5
e_n3,e_n4
Output Noise Voltage 10 Hz ≤ f ≤ 100 kHz,
45
C_OUT = 1 µF ⁽³⁾
PSRR
Power Supply
F = 10 kHz, C_OUT = 1 µF
65
Rejection Ratio
I_OUT3/4 = 20 mA ⁽³⁾
t_START-UP
Start-Up Time from C_OUT = 1 µF, I_OUT3/4 = 80mA
40
Enable ⁽³⁾
80
mA
310
mV
mV
mV
µV_RMS
dB
60
µs
t_Transient
Start-Up Transient
C_OUT = 1µF, I_OUT3/4 = 80 mA
5
Overshoot
(3)
30
mV
(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) Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This
specification does not apply in cases it implies operation with an input voltage below the 3.0V minimum appearing under Operating
Ratings. For example, this specification does not apply for devices having 1.5V outputs because the specification would imply operation
with an input voltage at or about 1.5V.
(3) Specified by design.
10
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