L4938ED STMicroelectronics, L4938ED Datasheet - Page 9

• Manufacturer Part Number: L4938ED
• Description: IC VREG ADVANCED DUAL SO-20
• Manufacturer: STMicroelectronics

Specifications of L4938ED

• 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: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Polarity: Positive
• Number Of Outputs: 2
• Output Type: Fixed
• Output Voltage: 5 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: SMD/SMT
• Reference Voltage: 1.23 V
• Voltage Regulation Accuracy: 2 %
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L4938ED, L4938EPD
Table 7.
Table 8.
Table 9.
1. The reset threshold can be programmed continuously from typ 3.8 V to 4.7 V by changing a value of an
2. This is a minimum reset time according to the hysteresis of the comparator. Delay time starts with V
3. This is the nominal reset time depending on the discharging limit of C
Symbol
Symbol
I
Symbol
I
V
V
t
EN HIGH
t
EN LOW
V
V
RD nom
V
RD min
V
V
external resistor from pin PR to GND.
exceeding V
threshold of the timer comparator. Delay time starts with V
OLi 1,2
ENhyst
V
RESH
t
RESL
I
I
ENH
RTH
ENL
RR
CT
CT
RT
Line regulation
Enable input low voltage
(output 2 active)
Enable input high voltage
Enable hysteresis
Enable input current low
Enable input current high
Reset threshold voltage
Reset threshold 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
OUT1, OUT2
Enable input
Reset circuit
RT
.
Parameter
Parameter
Parameter
Doc ID 17243 Rev 1
(1)
V
I
(after regulation setting)
V
V
T
V
T
R
R
R
C
C
C
V
V
R
V
V
O2
J
J
S
EN
EN
EN
OUT1
OUT1
OUT1
RES
PR
PR
PR
RES
RES
RES
RES
< 130 °C;
= 130 to 150 °C;
= 6 to 28 V; I
= 5 mA,
= 0
= 1.1 to 7 V;
= 1.1 to 7 V;
= ∞
= 0
= ∞
= 5 V
= 47 nF; t
= 47 nF
= 47 nF
= 10 KΩ to V
Test condition
Test condition
< V
> V
≥ 1.5 V
Test condition
RT
RT
OUT1
(3)
O1
r
≤ 30 µs
exceeding V
OUT1
= 1 mA,
T
(2)
(saturation voltage) and the upper
RT
Min.
Min.
3.65
-1.3
-20
-20
-10
1.4
4.5
Electrical specifications
20
30
40
60
10
-1
.
3
Min.
Typ.
Typ.
V
100
0.3
3.8
30
60
60
50
-8
-1
O1
0
0
6
Typ. Max. Unit
-
Max.
Max.
V
3.95
120
100
140
150
0.2
0.7
0.4
20
60
10
15
-3
O1
1
1
1
20
-
OUT1
Unit
Unit
mV
mV
mA
ms
ms
µA
µA
µA
µA
µA
µs
mV
V
V
V
V
V
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