SI91871_05 Datasheet, PDF (3/10 Pages) Vishay Siliconix – 300-mA Ultra Low-Noise LDO Regulator With Discharge Option

Si91871
Vishay Siliconix
SPECIFICATIONS
Parameter
Symbol
Test Conditions Unless Specified
T_A = 25_C, V_IN = V_OUT(nom) + 1 V
I_OUT = 1 mA, C_IN = 2 mF, C_OUT = 2.0 mF
V_SD = 1.5 V
Temp^a
Limits
−40 to 85_C
Min^b Typ^c Max^b
Unit
Output Noise Voltage
e_N
V_NOM = 2.6 V, BW = 10 Hz to 100 kHz,
0 mA t I_OUT t 300 mA, C_NOISE = 0.01 mF
Room
30
mV(rms)
f = 1 kHz
Room
60
Ripple Rejection
DV_OUT/DV_IN
I_OUT = 300 mA
f = 10 kHz
Room
40
dB
f = 100 kHz
Room
30
Dynamic Line Regulation
DV_O(line)
V_IN : V_OUT(nom) + 1 V to V_OUT(nom) + 2 V
t_r/t_f = 2 ms, I_OUT = 300 mA
Room
20
mV
Dynamic Load Regulation
DV_O(load)
I_OUT : 1 mA to 300 mA, t_r/t_f = 2 ms
Room
20
Thermal Shutdown Junction
Temperature
Thermal Hysteresis
T_J(S/D)
T_HYST
Room
150
_C
Room
20
Reverse current
I_R
V_IN = −6.0 V
Room
1
mA
Short Circuit Current
I_SC
V_OUT = 0 V
Room
700
mA
Shutdown
Shutdown Supply Current
SD Pin Input Voltage
Auto Discharge Resistance
SD Pin Input Current^f
SD Hysteresis
V_OUT Turn-On Time
I_CC(off)
V_SD
R_DIS
I_IN(SD)
V_HYST(SD)
t_ON
V_SD = 0 V
High = Regulator ON (Rising)
Low = Regulator OFF (Falling)
V_SD = 1.5 V, V_IN = 6 V
V_SD (See Figure 1), I_LOAD = 100 nA
Room
0.1
1
mA
Full
1.5
Full
V_IN
V
0.4
Room
100
W
Room
0.7
mA
Full
150
mV
50
ms
Notes
a. Room = 25_C, Full = −40 to 85_C.
b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum.
c. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. Typical values for dropout voltage at V_OUT w 2 V are measured at
V_OUT = 3.3 V, while typical values for dropout voltage at V_OUT < 2 V are measured at V_OUT = 1.8 V.
d. Dropout voltage is defined as the input to output differential voltage at which the output voltage drops 2% below the output voltage measured with a 1-V
differential, provided that V_IN does not not drop below 2.0 V.
e. Ground current is specified for normal operation as well as “drop-out” operation.
f. The device’s shutdown pin includes a typical 2-MW internal pull-down resistor connected to ground.
g. V_OUT(nom) is V_OUT when measured with a 1-V differential to V_IN.
TIMING WAVEFORMS
Document Number: 72012
S-51147—Rev. F, 20-Jun-05
V_SD
0V
V_OUT
t_r v 1 ms
t_ON
0.95 V_NOM
V_IN
V_NOM
FIGURE 1. Timing Diagram for Power-Up
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