LP3918 Datasheet, PDF (8/39 Pages) National Semiconductor (TI) – Battery Charge Management and Regulator Unit

LP3918
SNVS476D – AUGUST 2007 – REVISED MAY 2013
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LDO1 (CORE) Electrical Characteristics
Unless otherwise noted, V_IN ( = VIN1 = VIN2 = BATT) = 3.6V, GND = 0V, C_VIN1-2=10µF, C_LDOX=1µF. V_OUT1 set to 3.0V output.
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
Typ
V_OUT1
Output Voltage Accuracy I_OUT1 = 1mA, V_OUT1= 3.0V
I_OUT1
V_DO1
ΔV_OUT1
e_n1
PSRR
t_START-UP
Output Voltage
Default
1.8
Output Current
V_INMIN ≤ V_IN ≤ 5.5V
Output Current Limit
V_OUT1 = 0V
600
Dropout Voltage
I_OUT1 = 300mA, ⁽²⁾
200
Line Regulation
V_INMIN ≤ V_IN ≤ 5.5V
2
I_OUT1 = 1mA
Load Regulation
1mA≤ I_OUT1 ≤ 300mA
20
Output Noise Voltage
10Hz≤ f≤ 100KHz,
45
C_OUT
=
(3)
1µF
Power Supply Rejection F = 10kHz, C_OUT = 1µF
65
Ratio
I_OUT1 = 20mA ⁽³⁾
Start-Up Time from Shut- C_OUT = 1µF, I_OUT1 = 300mA
60
down
(3)
Limit
Min
Max
−2
+2
−3
+3
300
280
170
Units
%
V
mA
mV
mV
mV
µV_RMS
dB
µs
T_Transient
Start-Up Transient
Overshoot
C_OUT = 1µF, I_OUT1 = 300mA
60
(3)
120
mV
(1) 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 100mV 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. Not production tested.
LDO2 (DIGI) Electrical Characteristics
Unless otherwise noted, V_IN ( = VIN1 = VIN2 = BATT) = 3.6V, GND = 0V, C_VIN1-2=10µF, C_LDOX=1µF. 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
V_OUT2
Output Voltage Accuracy I_OUT2 = 1mA, V_OUT2= 3.0V
−2
+2
%
−3
+3
Output Voltage
Default
3.0
V
I_OUT2
V_DO2
ΔV_OUT2
Output Current
V_INMIN ≤ V_IN ≤ 5.5V
Output Current Limit
V_OUT2 = 0V
600
Dropout Voltage
I_OUT2 = 300mA ⁽²⁾
200
Line Regulation
V_INMIN ≤ V_IN ≤ 5.5V
2
I_OUT2 = 1mA
Load Regulation
1mA≤ I_OUT2 ≤ 300mA
20
300
mA
280
mV
mV
mV
(1) 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 100mV 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.
8
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