LP8725 Datasheet, PDF (23/46 Pages) National Semiconductor (TI) – Power Management Unit for Application/Multimedia Processors and Sub-Systems

LP8725
www.ti.com
SNVS618G – DECEMBER 2009 – REVISED MAY 2013
DIGITAL LDOs (1, 2, 3) (continued)
Unless otherwise noted, V_IN1=V_IN2=V_IN3=V_INB1=V_INB2=V_INLILO1=V_INLILO2=3.6V; C_LODX=1µF; C_BUCKOUT=C_BUCKIN=4.7 µF,
C_VIN1–3=C_VINLILO1C_VINLILO2=2.2 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_J= -40 to +125°C. ⁽¹⁾
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
V_DO
I_OUT
I_SLEEP
Dropout Voltage
Output Current
Max Output Current in
Sleep Mode
I_OUT = 300 mA
Nominal V_OUT = 2.8V ⁽³⁾
190
270
mV
0
300
mA
1
mA
I_SC
e_N
PSRR
Output Current Limit
Output Voltage Noise
Power Supply Rejection
Ratio
V_OUT = 0V
10 Hz ≤ f ≤ 100 KHz
I_OUT = 300 mA
f ≤ 10 KHz, I_OUT = 20 mA
650
mA
35
µV_RMS
65
dB
t_STUP
V_OS
C_OUT
Startup Time
I_OUT = 0 mA to 300 mA in Idle mode.
20
µs
Start-up Overshoot
I_OUT = 300 mA ⁽⁴⁾
30
mV
External Output
(4)
Capacitance for Stability
0.5
1
20
µF
(3) Dropout voltage is the voltage difference between the input and the output at which the output voltage drops to 100 mV below its
nominal value.
(4) This specification is guaranteed by design.
LOW-NOISE ANALOG LDOs (4, 5)
Unless otherwise noted, V_IN1=V_IN2=V_IN3=V_INB1=V_INB2=V_INLILO1=V_INLILO2=3.6V; C_LODX=1µF; C_BUCKOUT=C_BUCKIN=4.7 µF,
C_VIN1–3=C_VINLILO1C_VINLILO2=2.2 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_J= -40 to +125°C. ⁽¹⁾
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
V_OUT
Output Voltage Accuracy I_OUT = 1mA, V_OUT = 2.8V
−2
−2.5
+2
%
+2.5
ΔV_OUT
V_DO
Line Regulation
Load Regulation
Dropout Voltage
V_OUT + 0.5V ≤ V_IN3 ≤ 4.5V
I_OUT = 1mA ⁽²⁾
1 < I_OUT < 300 mA
I_OUT = 300 mA
Nominal V_OUT = 2.8V
(3)
1
mV
1
220
310
mV
I_OUT
I_SLEEP
I_SC
e_N
PSRR
t_STUP
V_OS
C_OUT
Output Current
0
300
mA
Max Output Current in
Sleep Mode
1
mA
Output Current Limit
Output Voltage Noise
Power Supply Rejection
Ratio
V_OUT = 0V
10 Hz ≤ f ≤ 100 KHz
I_OUT = 300 mA
f ≤ 10 KHz, I_OUT = 20 mA
625
10
10
75
mA
µV_RMS
dB
Startup Time
I_OUT = 0 mA to 300 mA in Idle mode.
35
µs
Start-up Overshoot
I_OUT = 300 mA ⁽⁴⁾
30
mV
External Output
(4)
Capacitance for Stability
0.5
1
20
µF
(1) Min and Max limits are specified by design, test or statistical analysis. Typical numbers are not verified, but do represent the most likely
norm.
(2) The minimum input voltage equals V_OUT (nom) + 0.5V or 2.5V, which ever is greater.
(3) Dropout voltage is the voltage difference between the input and the output at which the output voltage drops to 100 mV below its
nominal value.
(4) This specification is guaranteed by design.
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