L4988MDTR STMicroelectronics, L4988MDTR Datasheet - Page 15

• Manufacturer Part Number: L4988MDTR
• Description: IC REG LDO 5V 200MA 20SOIC
• Manufacturer: STMicroelectronics
• Series: -r

Specifications of L4988MDTR

• Regulator Topology: Positive Fixed
• Voltage - Output: 5V
• Voltage - Input: 5.6 ~ 31 V
• Voltage - Dropout (typical): 0.27V @ 200mA
• Number Of Regulators: 1
• Current - Output: 200mA
• Current - Limit (min): 200mA
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC
• Number Of Outputs: 1
• Polarity: Negative, Positive
• Output Voltage: - 0.3 V to + 6 V
• Output Type: Adjustable
• Dropout Voltage (max): 0.5 V at 200 mA
• Output Current: 200 mA
• Line Regulation: 25 mV
• Load Regulation: 25 mV
• Voltage Regulation Accuracy: 2 %
• Maximum Operating Temperature: + 150 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Reference Voltage: 5.1 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L4988
3
Note:
3.1
Application information
Figure 24. L4988 application schematic
The input capacitor Cs > 200nF is necessary for the smoothing of line disturbances. The
output capacitor C01 > 100nF is necessary for the stability of the regulation loop. In order to
damp output voltage oscillations during high load current surges, it is recommended to put
an additional electrolytic capacitor C02 > 10µF at the output pin.
Voltage regulator
Voltage regulator uses a p-channel mos transistor as a regulating element. With this
structure a very low dropout voltage at currents up to 200mA is obtained. The output voltage
is regulated up to transient input supply voltage of 40V. No functional interruption due to
over-voltage pulses is generated. A short circuit protection to GND is provided. The high
precision of the output voltage is obtained with a pre-trimmed reference voltage.
Figure 25. Behavior of output current versus regulated voltage Vo
Ctw
Ctr
Vi
Cs
WEn
Vcw
Vcr
Vs
Wi
Watchdog
Watchdog
protection
protection
protection
Thermal
Thermal
Thermal
Vo_ref
Vo
Voltage reference
Voltage reference
Voltage reference
Voltage reference
Reset
Reset
Ishort Ilim
Gnd
+
+
-
-
Iout
Application information
Vo
Res
C
01
15/30
C
02