LP3905 Datasheet, PDF (6/24 Pages) National Semiconductor (TI) – Power Management Unit For Low Power Handheld Applications

LP3905
SNVS374D – JUNE 2006 – REVISED MAY 2013
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LDO Regulator Electrical Characteristics^(1)(2)(3)
The linear regulators have a current rating of I_max= 150mA with C_OUT = 1.0μF. A 100mA rating applies with C_OUT = 0.47μF.
Unless otherwise specified, limits are set with V_IN = 3.8V, V_EN1/2 = 3.8V, C_IN = 1μF, C_OUT = 0.47μF, I_OUT = 1.0mA. Limits in
standard typeface are for T_J = 25°C. Limits in boldface type apply over the full junction temperature range (−40°C ≤ T_J ≤
+125°C). Unless otherwise noted, specifications apply to the LP3905 Typical Application Circuit (Figure 1)^(1)(2)(4)
Parameter
Test Conditions
Min
Typ
Max Units
Output Voltage Tolerance
Over Full Line and Load Regulation
−3
3
%
ΔV_OUT
I_LOAD
V_DO
I_SC
I_OUT
Line Regulation Error
Load Regulation Error
Load Current
Dropout Voltage⁽⁷⁾
Short Circuit Current Limit
Maximum Output Current
PSRR
Power Supply Rejection Ratio⁽⁶⁾
e_n
Output Noise Voltage⁽⁶⁾
Transient Characteristics⁽⁶⁾
V_IN = 3.8V to 5.5V,
I_OUT = 1mA
I_OUT = 1 mA to 100mA
See ^{(5) (6)}
I_OUT = 100mA
See ⁽⁸⁾
C_OUT = 1.0μF
f = 100Hz, I_OUT = 100mA
f = 1kHz, I_OUT = 100mA
f = 10kHz, I_OUT = 100mA
f = 50kHz, I_OUT = 100mA
f = 100kHz, I_OUT = 100mA
BW = 10Hz to 100kHz,
V_IN = 4.2V
Buck1 Turned ON with
I_LOAD= 0mA, Buck2
Turned OFF
I_OUT = 1mA
I_OUT = 100mA
0.05
%/V
0.003
%/mA
0
mA
80
150
mV
300
500
mA
150
mA
90
90
60
dB
35
25
13.5
15.5
μV_RMS
Line Transient⁽⁶⁾
ΔV_OUT
Load Transient⁽⁶⁾
Overshoot on Startup
V_IN = (V_OUT(NOM) + 1.0V) to (V_OUT(NOM) +
1.6V) in 10μs, I_OUT = 1 mA
V_IN = (V_OUT(NOM) + 1.6V) to (V_OUT(NOM) +
1.0V) in 10μs, I_OUT = 1mA
I_OUT = 1mA to 100mA in 10μs
I_OUT = 100mA to 1mA in 10μs
I_OUT = 1mA to 150mA in 10μs
C_OUT = 1.0μF
I_OUT = 150mA to 1mA in 10μs
C_OUT = 1.0μF
See ⁽⁶⁾
6
-70
-100
mV
6
30
mV
35
20
mV
(1) All voltages are with respect to the potential at the GND pin.
(2) Min and Max limits are ensured by design, test or statistical analysis. Typical numbers are not ensured, but do represent the most likely
norm.
(3) The parameters in the electrical characteristic table are tested at V_IN= 3.8V unless otherwise specified. For performance over the input
voltage range refer to datasheet curves.
(4) C_IN, C_OUT: Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.
(5) The device maintains a stable, regulated output voltage without a load.
(6) This specification is ensured by design.
(7) 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.
(8) Short Circuit Current is measured with V_OUT pulled to 0v and V_IN worst case = 5,5V.
6
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