L5973AD STMicroelectronics, L5973AD Datasheet - Page 12

• Manufacturer Part Number: L5973AD
• Description: IC REG SW 2A STEPDOWN 8-SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L5973AD

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.24 ~ 35 V
• Current - Output: 2A
• Frequency - Switching: 500kHz
• Voltage - Input: 4 ~ 36 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width) Exposed Pad, 8-eSOIC. 8-HSOIC
• Power - Output: 2.25W
• Output Voltage: 35 V
• Output Current: 2 A
• Input Voltage: 4 V to 36 V
• Switching Frequency: 500 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 100 %
• Low Dropout Operation: 100 % duty cycle
• For Use With: 497-4134 - EVAL BOARD FOR L5973 SERIES497-4133 - EVAL BOARD FOR L5973 SERIES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-1417-5; 497-1417-5; 497-4565-5; E-L5973AD

Functional description
4.7
4.8
12/22
Figure 7.
Inhibit function
The inhibit feature allows to put in stand-by mode the device. With INH pin higher than 2.2 V
the device is disabled and the power consumption is reduced to less than 100 μA. With INH
pin lower than 0.8 V, the device is enabled. If the INH pin is left floating, an internal pull up
ensures that the voltage at the pin reaches the inhibit threshold and the device is disabled.
The pin is also Vcc compatible.
Thermal shutdown
The shutdown block generates a signal that turns off the power stage if the temperature of
the chip goes higher than a fixed internal threshold (150 °C). The sensing element of the
chip is very close to the PDMOS area, so ensuring an accurate and fast temperature
detection. An hysteresis of approximately 20 °C avoids that the devices turns on and off
continuously
D00IN1133
DRIVE
DRAIN
STOP
Driving circuitry
Vgs max
CONTROL
ON/OFF
CLAMP
GATE
Doc ID 9552 Rev 9
OFF
ON
DRAIN
I
I
OFF
ON
VCC
PDMOS
L
ESR
C
VOUT
I
LOAD
L5973AD