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PDF L4938E Data sheet ( Hoja de datos )
| Número de pieza | L4938E | |
| Descripción | ADVANCED VOLTAGE REGULATOR | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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L4938E/ED
® L4938EPD
ADVANCED VOLTAGE REGULATOR
ENABLE AND SENSE INPUTS (EN, SI) PRO-
TECTED AGAINST NEGATIVE TRANSIENTS
DOWN TO -5V
RESET THRESHOLD ADJUSTABLE FROM
3.8 TO 4.7V
EXTREMELY LOW QUIESCENT CURRENT,
65µA (LESS THAN 90µA) IN STANDBY
MODE
OPERATING DC SUPPLY VOLTAGE RANGE
5V - 28V
OPERATING TRANSIENT SUPPLY VOLT-
AGE UP TO 40V
HIGH PRECISION STANDBY OUTPUT VOLT-
AGE 5V ± 1% WITH 100mA CURRENT CA-
PABILITY
OUTPUT 2 VOLTAGE 5V ± 2% WITH 400mA
CURRENT CAPABILITY (ADJ WIRED TO
VOUT2)
OUTPUT 2 VOLTAGE ADJUSTABLE BY EX-
TERNAL VOLTAGE DIVIDER
OUTPUT 2 DISABLE FUNCTION FOR
STANDBY MODE
PIN CONNECTIONS
DIP (12+2+2)
SO20 (12+4+4) PowerSO20
ORDERING NUMBERS: L4938E (DIP)
L4938ED (SO)
L4938EPD (PSO)
DESCRIPTION
The L4938E/ED/EPD is a monolithic integrated
dual voltage regulator with two very low dropout
outputs and additional functions as power-on re-
set and input voltage sense. It is designed for
supplying the microcomputer controlled systems
especially in automotive applications.
PR
CT
EN
GND
GND
RES
SO
OUT1
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
D94AT075A
SI
VS1
VS2
GND
GND
N.C.
OUT2
ADJ
PR
CT
EN
GND
GND
GND
GND
RES
SO
OUT1
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
D94AT076A
SI
VS1
VS2
GND
GND
GND
GND
N.C.
OUT2
ADJ
GND
N.C.
VS2
VS1
SI
PR
CT
EN
N.C.
GND
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
L4938EPD
GND
N.C.
OUT2
ADJ
OUT1
SO
RESET
N.C.
N.C.
GND
DIP (12+2+2)
SO (12+4+4)
PowerSO20
February 1999
1/12
1 page  
Figure 1. Application Diagram.
L4938E - L4938ED - L4938EPD
(Note 8)
100K
15V
for example
BZX97C15
VS1
CS
VS2
EN
1.23V
REG1
REG2
PR
RESET
SI
1.23V
SENSE
1.23V
REFERENCE
1.23V
1.4V
OUT1
CO1
OUT2
ADJ
CO2
CT (Note 7)
CT
RES
SO
VOUT1
RSO
GND
D94AT079A
FUNCTIONAL DESCRIPTION
The L4938E/ED/EPD is a monolithic integrated
dual voltage regulator, based on the STM modu-
lator voltage regulator approach. Several out-
standing features and auxiliary functions are im-
plemented to meet the requirements of supplying
microprocessor systems in automotive applica-
tions. Nevertheless, it is suitable also in other ap-
plications where two stabilized voltages are re-
quired. The modular approach of this device
allows to get easly also other features and func-
tions when required.
Standby Regulator
The standby regulator uses an Isolated collector
Vertical PNP transistor as a regulating element.
With this structure very low dropout volotage at
currents up to 100mA is obtained. The dropout
operation of the standby regulator is maintained
down to 3V input supply voltage. The output volt-
age is regulated up to the transient input supply
voltage of 40V. With this feature no functional in-
terruption due to overvoltage pulses is generated.
In the standby mode when the output 2 is dis-
abled, the current consumption of the device (qui-
escent current) is less than 90µA (14V supply
voltage).
To reduce the quiescent current peak in the un-
dervoltage region and to improve the transient re-
sponse in this region, the dropout voltage is con-
trolled. A second regulation path will keep the
output voltage without load below 5.5V even at
high temperatures.
Output 2 Voltage
The output 2 regulator uses the same output
structure as the standby regulator but rated for
the output current of 400mA. The output voltage
is internally fixed to 5V if ADJ is connected to
VOUT2.
The output 2 regulator can be switches OFF via
the enable input.
Figure 2.
-
+
1.23V
R1i
RADJ
R2i
total 100K
typical
OUT2
ADJ
R1E
R2E
D94AT080
5/12
5 Page 
DIM.
mm
inch
MIN. TYP. MAX. MIN. TYP. MAX.
A 3.6 0.142
a1 0.1
0.3 0.004
0.012
a2 3.3 0.130
a3 0
0.1 0.000
0.004
b 0.4
0.53 0.016
0.021
c 0.23
0.32 0.009
0.013
D (1) 15.8
16 0.622
0.630
D1 9.4
9.8 0.370
0.386
E 13.9
14.5 0.547
0.570
e 1.27
0.050
e3 11.43
0.450
E1 (1) 10.9
11.1 0.429
0.437
E2 2.9 0.114
E3 5.8
6.2 0.228
0.244
G0
0.1 0.000
0.004
H 15.5
15.9 0.610
0.626
h 1.1 0.043
L 0.8
1.1 0.031
0.043
N 10° (max.)
S 8° (max.)
T 10
0.394
(1) ”D and F” do not include mold flash or protrusions.
- Mold flash or protrusions shall not exceed 0.15 mm (0.006”).
- Critical dimensions: ”E”, ”G” and ”a3”
L4938E - L4938ED - L4938EPD
OUTLINE AND
MECHANICAL DATA
JEDEC MO-166
PowerSO20
NN
b
DETAIL A
e3
H
D
20
E2
1
h x 45
T
R
a2 A
e DETAIL B
E
lead
c
a1
DETAIL A
a3
DETAIL B
slug
11 0.35
Gage Plane
-C -
SL
SEATING PLANE
GC
E1 BOTTOM VIEW
(COPLANARITY)
10
PSO20MEC
E3
D1
11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet L4938E.PDF ] | |
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