L4938ED013TR STMicroelectronics, L4938ED013TR Datasheet - Page 12

• Manufacturer Part Number: L4938ED013TR
• Description: IC REG 5V/ADV DUAL LDO 20SOIC
• Manufacturer: STMicroelectronics
• Series: -r

Specifications of L4938ED013TR

• 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: Contains lead / RoHS non-compliant
• Other names: 497-3355-2

Application information
3.3
3.4
12/20
In the standby mode when the output 2 is disabled, the current consumption of the device
(quiescent current) is less than 90 µA (14 V supply voltage).
To reduce the quiescent current peak in the undervoltage region and to improve the
transient response in this region, the dropout voltage is controlled. A second regulation path
keeps the output voltage without load below 5.5 V 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 400 mA. The output voltage is internally fixed to 5 V if ADJ is
connected to V
Figure 4.
Connecting a resistor divider R
programmed to the value of
with R
temperature coefficient (T
account. Pin ADJ in this mode should not have a capacitive burden because this would
reduce the phase margin of the regulator loop.
Reset circuit
The reset circuit supervises the standby output voltage. The reset output (RES) is defined
from V
V
The reset threshold of 4.7 V is defined with the internal reference voltage
output divider, when pin PR is left open. The reset threshold voltage can be programmed in
the range from 3.8 V to 4.7 V by connecting an external resistor from pin PR to GND.
OUT1
ADJ
.
OUT
= 60 K to 150 K and V
≥ 1 V. Even if V
OUT2
OUT2
. The output 2 regulator can be switches OFF via the enable input.
V
C
OUT2
S
- 2000 pprm) of the internal resistor (R
is lacking, the reset generator is supplied by the output voltage
Doc ID 17243 Rev 1
1E
OUT1
=
, R
V
2E
OUT1
= 4.95 to 5.05 V. For an exact calculation the
to the ADJ, OUT2 pin the output voltage 2 can be
⎛
⎜
⎝
1
+
R
------------------------------------------------ -
1E
R
(
2E
R
2E
⋅
R
+
ADJ
R
ADJ
)
⎞
⎟
⎠
ADJ
L4938ED, L4938EPD
) must be taken into
(a)
and standby