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L4974 (L4974A) IC – 3.5A Switching Regulator IC

874.00 + GST

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The L4974A is a step down monolithic power switching regulator delivering 3.5A at a voltage variable from 5.1 to 40V. Realized with BCD mixed technology, the device uses a DMOS output transistor to obtain very high efficiency and very fast switching times. Features of the L4974A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a Power dip 16 + 2 + 2 plastic package and requires few external components. Efficient operation at switching frequencies up to 200KHz allows reduction in the size and cost of external filter component.


• 3.5a Output Current

• 5.1v To 40v Output Voltage Range

• 0 To 90% Duty Cycle Range

• Internal Feed-Forward Line Reg

• Internal Current Limiting

• Precise 5.1v ± 2% On Chip Reference

• Reset And Power Fail Functions .Input/Output Sync Pin

• Under Voltage Lock Out With Hysteretic Turn-On

• Pwm Latch For Single Pulse Per Period

• Very High Efficiency

• Switching Frequency Up To 200khz

• Thermal Shutdown

• Continuous Mode Operation


Symbol Parameters Values Units
V11 Input Voltage 55 V
V11 Input Operating Voltage 50 V
V20 Output DC Voltage -1 V
Output Peak Voltage at t = 0.1µs f = 200KHz -7
I20 Maximum Output Current Internally Limited
V1 Bootstrap Voltage 65 V
Bootstrap Operating Voltage V11 + 15
V4, V8 Input Voltage at Pins 3, 12 12 V
V3 Reset Output Voltage 50 V
I3 Reset Output Sink Current 50 mA
V2, V7, V9, V10 Input Voltage at Pin 2,7,9,10 7 V
I2 Reset Delay Sink Current 30 mA
I7 Error Amplifier Output Sink Current 1 A
I8 Soft Start Sink Current 30 mA
Ptot Total Power Dissipation at Tcase < 90°C 5 W
Tj, Tstg Junction and Storage Temperature -40 to 150 °C

* product image for illustration purposes only. actual product may vary.


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