L4938ED 데이터 시트보기 (PDF) - STMicroelectronics
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L4938ED Datasheet PDF : 20 Pages
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L4938ED, L4938EPD
Electrical specifications
Table 7.
Symbol
OUT1, OUT2
Parameter
VOLi 1,2 Line regulation
Test condition
VS = 6 to 28 V; IO1 = 1 mA,
IO2 = 5 mA,
(after regulation setting)
Min. Typ. Max. Unit
20 mV
Table 8.
Symbol
Enable input
Parameter
VENL
Enable input low voltage
(output 2 active)
VENH
VENhyst
IEN LOW
Enable input high voltage
Enable hysteresis
Enable input current low
IEN HIGH Enable input current high
Test condition
VEN = 0
VEN = 1.1 to 7 V;
TJ < 130 °C;
VEN = 1.1 to 7 V;
TJ = 130 to 150 °C;
Min. Typ. Max. Unit
-20
1
V
1.4
20
V
20 30 60 mV
-20 -8
-3
µA
-1
0
1 µA
-10
0
10 µA
Table 9. Reset circuit
Symbol
Parameter
Test condition
Min. Typ. Max. Unit
VRT
Reset threshold voltage(1) RPR = ∞
RPR = 0
4.5
VO1- VO1-
0.3 0.2
V
3.65 3.8 3.95 V
VRTH Reset threshold hysteresis RPR = ∞
30
tRD min Reset pulse delay
CRES = 47 nF; t r ≤ 30 µs(2) 40
tRD nom Reset pulse delay
CRES = 47 nF(3)
60
60 120 mV
60 100 ms
100 140 ms
tRR Reset reaction time
CRES = 47 nF
10 50 150 µs
ICT
Pull down capability of the
discharge circuit
VOUT1 < VRT
3
6
15 mA
ICT
VRESL
VRESH
Charge current
Reset output low voltage
Reset output high leakage
current
VOUT1 > VRT
RRES = 10 KΩ to VOUT1
VOUT1 ≥ 1.5 V
VRES = 5 V
-1.3 -1 0.7 µA
0.4 V
1 µA
1. The reset threshold can be programmed continuously from typ 3.8 V to 4.7 V by changing a value of an
external resistor from pin PR to GND.
2. This is a minimum reset time according to the hysteresis of the comparator. Delay time starts with VOUT1
exceeding VRT.
3. This is the nominal reset time depending on the discharging limit of CT (saturation voltage) and the upper
threshold of the timer comparator. Delay time starts with VOUT1 exceeding VRT.
Doc ID 17243 Rev 2
9/20
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