L4938E STMicroelectronics, L4938E Datasheet - Page 4

• Manufacturer Part Number: L4938E
• Description: IC REG LDO DUAL 5V/ADV 16DIP
• Manufacturer: STMicroelectronics

Specifications of L4938E

• Regulator Topology: Positive Fixed and Adjustable
• Voltage - Output: 5V, 4.9 ~ 5.1 V
• Voltage - Input: Up to 28V
• Voltage - Dropout (typical): 0.2V @ 100mA, 0.3V @ 400mA
• Number Of Regulators: 2
• Current - Output: 100mA, 400mA
• Current - Limit (min): 100mA, 450mA
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Through Hole
• Package / Case: 20-SOIC (7.5mm Width)
• Polarity: Positive
• Number Of Outputs: 2
• Output Type: Fixed
• Output Voltage: 5.1 V
• Output Current: 5 mA
• Line Regulation: 20 mV
• Load Regulation: 50 mV
• Dropout Voltage (max): 0.2 V
• Input Voltage Max: 20 V
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 40 C
• Maximum Power Dissipation: 875 mW
• Mounting Style: Through Hole
• Reference Voltage: 1.23 V
• Voltage Regulation Accuracy: 2 %
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3355-5; 497-3914-5; 497-3914-5

L4938E - L4938ED - L4938EPD
ELECTRICAL CHARACTERISTICS (Continued)
Note :
4) The reset threshold can be programmed continuously from typ 3.8V to 4.7V by changing a value of an external resistor from pin PR to GN
5) This is a minimum reset time according to the hysteresis of the comparator. Delay time starts with V
6) This is the nominal reset time depending on the discharging limit of C
7) The leakage of C
8) For transients exceeding 20V or -20V external protection is required at the Pins SI and EN as shown at Pin EN. The protection proposed will
4/12
ENABLE INPUT
RESET CIRCUIT
SENSE COMPARATOR
provide proper function for transients in the range of 200V. If the zener diode is omitted the external resistor should be raised to 200K
to limit the current to 1mA. Without the zener diode, the function 20V or -20V can not be guaranteed.
Delay time starts with V
increased. The external resistor should have more than 30K .
for stability: Cs
Symbol
I
I
V
I
t
EN HIGH
t
V
I
EN LOW
V
RD nom
SI HIGH
V
SI LOW
V
V
V
RD min
V
I
V
ENhyst
V
t
RESH
V
I
I
SOH
RESL
ENH
SITH
ENL
RTH
RR
SOL
CT
CT
SIT
RT
SI
Enable Input Low Voltage
(Output 2 Active)
Enable Input High Voltage
Enable Hysteresis
Enable Input Current Low
Enable Input Current High
Reset Theresold Voltage
(note4)
Reset Theresold Hysteresis
Reset Pulse Delay
Reset Pulse Delay
Reset Reaction Time
Pull Down Capability of the
Discharge circuit
Charge Current
Reset Output Low Voltage
Reset Output High Leakage
current
Functional Range
Sense Threshold Voltage
Sense Threshold Hysteresis
Sense Output Low Voltage
Sense Output Leakage
Sense Input Current High
Sense Input Current Low
T
1 F, C01
must be less than 0.5mA (2V). If an external resistor between C
OUT1
Parameter
exceeding V
10 F, C02
RT
10 F, ESR
V
V
V
T
R
R
R
C
C
C
V
V
R
V
Falling Edge; T
Falling Edge; T
V
connected to 5V; V
V
V
V
V
V
5 (designed target) For details see application note.
J
EN
EN
EN
OUT1
OUT1
RES
SO
SI
SI
SI
PR
PR
PR
RES
RES
RES
RES
SI
OUT1
= 130 to 150 C;
= 0V
= 1.1 to 7V; T
= 1.1 to 7V; T
= 1.1 to 7V;
= 0
= 1.1 to 7V; T
= 5V; V
=
= 0
=
= 5V
= 47nF; t
= 47nF; (note 6)
= 47nF
= 10K
1.05V; R
< V
> V
Test Condition
1.5V
RT
RT
T
SI
(saturation voltage) and theupper threshold of the timer comparator.
to V
SO
r
J
J
J
1.5V
<130 C
<130 to 150 C
J
OUT1
J
30 s; (note 5)
=10K
<130 to 150 C
S
< 130 C;
<130 C
T
5V
and V
OUT1
is applied, the leakage current may be
Min.
3.65
1.08
1.05
-1.3
-20
1.4
-20
-10
4.5
-20
-10
-20
10
20
30
40
60
10
-1
-1
3
OUT1
exceeding V
V
Typ.
O1
1.16
1.16
100
3.8
30
60
60
50
30
-8
-1
-8
0
0
6
0
0
-0.3 V
RT
Max.
O1
3.95
1.24
1.29
120
100
140
150
0.7
0.4
0.4
20
60
10
15
20
60
10
-3
-3
1
1
1
1
1
-0.2
Unit
mV
mV
mA
mV
ms
ms
V
V
V
V
V
V
V
V
V
A
A
A
A
A
A
A
A
A
s