L4979D STMicroelectronics, L4979D Datasheet - Page 5

• Manufacturer Part Number: L4979D
• Description: IC VOLTAGE REG LDO SO-8
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4979D

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 150mA
• Voltage - Input: 5.6 ~ 31 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Polarity: Positive
• Input Voltage Max: 31 V
• Output Voltage: 5 V
• Output Type: Fixed
• Dropout Voltage (max): 0.4 V at 150 mA
• Output Current: 300 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

1
Block diagram and pin descriptions
Figure 1.
Table 2.
pin number
SO8
1
2
3
4
5
6
7
Block diagram
Pin function
pin number
5,6,15,16
SO20
10
11
14
17
1
4
7
Pin name
Doc ID 10262 Rev 7
Vcw
Res
gnd
gnd
Vcr
En
Wi
Vo
Enable input If high, regulator, watchdog and reset are
operating. If low, regulator, watchdog and reset are shut
down.
Ground reference
Ground These pins are to be connected to a heat
spreader electrically grounded
Reset output. It is pulled down when output voltage
drops below V
Reset timing adjust A capacitor between Vcr pin and
gnd sets the reset delay time (t
Watchdog timer adjust A capacitor between V
gnd sets the time response of the watchdog monitor.
Watchdog input. If the frequency at this input pin is too
low, the Reset output is activated.
Voltage regulator output Output capacitor >100 nF is
needed for regulator stability
o_th
or frequency at W
Function
rd
)
i
is too low.
cw
pin and
5/22