SI91872 Datasheet, PDF (3/9 Pages) Vishay Siliconix – 300-mA Low-Noise LDO Regulator With Error Flag and Discharge Option

Si91872
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
Ripple Rejection
Dynamic Line Regulation
Dynamic Load Regulation
Thermal Shutdown Junction
Temperature
Thermal Hysteresis
Reverse current
Short Circuit Current
Shutdown
Shutdown Supply Current
SD Pin Input Voltage
Auto Discharge Resistance
SD Pin Input Current^f
SD Hysteresis
V_OUT Turn-On Time
ERROR Output
ERROR High Leakage
ERROR Low Voltage
ERROR Voltage Threshold
ERROR Voltage Threshold
Hysteresis
f = 1 kHz
Room
60
DV_OUT/DV_IN
I_OUT = 300 mA
f = 10 kHz
Room
40
dB
f = 100 kHz
Room
30
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
DV_O(load)
I_OUT : 1 mA to 300 mA, t_r/t_f = 2 ms
Room
25
T_J(S/D)
T_HYST
I_R
I_SC
V_IN = −6.0 V
V_OUT = 0 V
Room
150
_C
Room
20
Room
1
mA
Room
700
mA
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)
Si91872 Only
V_SD = 1.5 V, V_IN = 6 V
V_SD (See Figure 1), I_LOAD = 100 mA
Room
0.1
1
mA
Full
1.5
Full
V_IN
V
0.4
Room
100
W
Room
0.7
mA
Full
150
mV
Room
50
ms
I_OFF
V_OL
V_ERROR
ERROR v V_IN. V_OUT in Regulation
Full
1
mA
I_SINK = 0.5 mA
Full
0.4
V
V_OUT Below V_OUT(nom)g, V_IN w 2 V
V_OUT Falling, I_OUT = 1 mA, V_OUT(nom) w 2 V
Full
−2
−4
−6
V_OUT(nom)g t 2 V, V_IN u 2 V
Full
−4
%
V_HYST(ERROR)
Room
1.5
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.
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
V_IN
V_SD
t_r v 1 mS
0V
V_OUT
t_ON
0.95 V_NOM
V_NOM
FIGURE 1. Timing Diagram for Power-Up
Document Number: 72013
S-51147—Rev. F, 20-Jun-05
www.vishay.com
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