LP3921 Datasheet, PDF (11/41 Pages) National Semiconductor (TI) – Battery Charger Management and Regulator Unit with Integrated Boomer® Audio Amplifier

LP3921
www.ti.com
SNVS580A – AUGUST 2008 – REVISED MAY 2013
LDO5 (RX), LDO6 (TX), LDO7 (GP) Electrical Characteristics
Unless otherwise noted, V_IN (=VIN1=VIN2=BATT=VDD) = 3.6V, GND = 0V, C_VIN1-2=10 µF, C_LDOX=1 µF. RX_EN, TX_EN high.
LDO7 Enabled via Serial Interface. Note V_INMIN is the greater of 3.0V or V_OUT5/6/7 + 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_OUT5, V_OUT6,
V_OUT7
Output Voltage
I_OUT5/6/7 = 1mA, V_OUT5/6/7= 3.0V
−2
+2
%
−3
+3
Default Output
LDO5
3
V
Voltage
LDO6
3
LDO7
3
I_OUT5, I_OUT6,
Output Current
V_INMIN ≤ V_IN ≤ 5.5V
I_OUT7
Output Current Limit V_OUT5/6/7 = 0V
300
V_DO5, V_DO6, V_DO7 Dropout Voltage
I_OUT5/6/7 = 150 mA ⁽²⁾
200
ΔV_OUT5, ΔV_OUT6, Line Regulation
V_INMIN ≤ V_IN ≤ 5.5V
2
ΔV_OUT7
I_OUT5/6/7 = 1 mA
Load Regulation
1mA≤ I_OUT5/6/7 ≤ 150 mA
10
e_n5, e_n6, e_n7
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_OUT5/6/7 = 20 mA ⁽³⁾
t_START-UP
Start-Up Time from C_OUT = 1 µF, I_OUT5/6/7 = 150 mA
40
Enable
(3)
150
mA
280
mV
mV
mV
µV_RMS
dB
60
µs
t_Transient
Start-Up Transient
C_OUT = 1 µF, I_OUT5/6/7 = 150 mA
5
Overshoot
(4)
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.
(4) Internal Thermal Shutdown circuitry protects the device from permanent damage.
Charger Electrical Characteristics
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_CHG-IN
Input Voltage Range
(3)
Operating Range
4.5
6.5
V
4.5
6
V_{OK_CHG}
CHG_IN OK trip-point
V_{CHG_IN} - V_BATT (Rising)
V_{CHG_IN} - V_BATT (Falling)
200
mV
50
(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) Junction-to-ambient thermal resistance (θ_JA) is taken from thermal modelling result, performed under the conditions and guidelines set
forth in the JEDEC standard JESD51-7. The value of (θ_JA) of this product could fall within a wide range, depending on PWB material,
layout, and environmental conditions. In applications where high maximum power dissipation exists (high V_IN, high I_OUT), special care
must be paid to thermal dissipation issues in board design.
(3) Specified by design.
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