List of figures L4938ED, L4938EPD
4/20 Doc ID 17243 Rev 2
List of figures
Figure 1. Block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Configuration diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 4. OUT2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 5. Reset generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 6. Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 7. Input protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 8. Input characteristics of SI, EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 9. SO-20 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 10. PowerSO-20 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
L4938ED, L4938EPD Block diagram and pin description
Doc ID 17243 Rev 2 5/20
1 Block diagram and pin description
Figure 1. Block diagram
Figure 2. Configuration diagram (top view)
1
19
20
10
9
8
7
6
5
4
3
2
14
15
16
18
17
13
12
11
GNDGND
GND
N.C.
N.C.
N.C.
GND
N.C.N.C.
OUT2
ADJ
OUT1
SO
RESET
V
S2
V
S1
SI
PR
CT
EN
PowerSO-20
1
19
20
10
9
8
7
6
5
4
3
2
14
15
16
18
17
13
12
11
GND
GND
N.C.
OUT2
ADJOUT1
SO
RES
V
S2
V
S1
SIPR
CT
EN
GND
GND
GND
GND
GND
GND
SO-20
Block diagram and pin description L4938ED, L4938EPD
6/20 Doc ID 17243 Rev 2
Table 2. Pin definitions and functions
PIn number
Name Function
SO-20 PowerSO-20
18 3 V
S2
Supply voltage (400 mA regulator)
19 4 V
S1
Supply voltage (100 mA regulator, reset, sense)
20 5 SI Sense input
1 6 PR Reset threshold programming
2 7 CT Reset delay capacitor
3 8 EN Enable (low activates the 400 mA regulator)
4, 5, 6, 7, 14, 15,
16, 17
1, 10, 11, 20 GND Ground
8 14 RES Reset output
9 15 SO Sense output
10 16 OUT1 100 mA regulator output
11 17 ADJ Feedback of 400 mA regulator
12 18 OUT2 400 mA regulator output
13 2, 9, 19 NC Not connected

L4938ED

Mfr. #:
Manufacturer:
STMicroelectronics
Description:
LDO Voltage Regulators Dual 5V Very LDO
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet