Product Summary

The L4970A is a stepdown monolithic power switching regulator delivering 10A 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 L4970A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a 15-lead multiwatt plastic power package and requires few external components. Efficient operation at switching frequencies up to 500KHz allows reduction in the size and cost of external filter components.

Parametrics

L4970A absolute maximum ratings: (1)Input Voltage, V9: 55V; (2)Input Operating Voltage, V9: 50V; (3)Output DC Voltage, V7: -1V; Output Peak Voltage at t = 0.1ms f = 200KHz, V7: -7V; (4)Maximum Output Current, I7: Internally Limited; (5)Bootstrap Voltage, V6: 65V; Bootstrap Operating Voltage, V6: V9 + 15V; (6)Input Voltage at Pins 3, 12, V3, V12: 12V; (7)Reset Output Voltage, V4: 50V; (8)Reset Output Sink Current, I4: 50 mA; (9)Input Voltage at Pin 5, 10, 11, 13, V5, V10, V11, V13: 7V; (10)Reset Delay Sink Current, I5: 30 mA; (11)Error Amplifier Output Sink Current, I10: 1A; (12)Soft Start Sink Current, I12: 30mA; (13)Total Power Dissipation at Tcase < 120℃, Ptot: 30W; (14)Junction and Storage Temperature, Tj, Tstg: -40 to 150℃.

Features

L4970A features: (1)10A Output current; (2)5.1V to 40V output voltagerange; (3)0 TO 90% Duty cycle range; (4)Internal feed-forward line regulation; (5)Internal current limiting; (6)Precise 5.1V ± 2% on chip reference; (7)Reset and power fail functions; (8)Soft start; (9)Input/Output sync pin; (10)Under voltage lock out with hysteretic turn-on; (11)Pwm latch for single pulse per period; (12)Veryhigh efficiency; (13)Switching frequency up to 500KHz; (14)Thermal shutdown; (15)Continuous mode operation.

Diagrams

L4970A block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
L4970A
L4970A
STMicroelectronics
Switching Converters, Regulators & Controllers 5.1 to 40V Step-Down
Data Sheet
0-1: $6.74
1-10: $6.55
10-100: $6.11
100-250: $5.96
Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
L4970A
L4970A
STMicroelectronics
Switching Converters, Regulators & Controllers 5.1 to 40V Step-Down
Data Sheet
0-1: $6.74
1-10: $6.55
10-100: $6.11
100-250: $5.96
L4973D5.1-013TR
L4973D5.1-013TR
STMicroelectronics
Switching Converters, Regulators & Controllers 5.1V 3.5A Step-Down
Data Sheet
0-1: $3.48
1-10: $3.10
10-100: $2.68
100-250: $2.53
L497B
L497B
STMicroelectronics
Motor / Motion / Ignition Controllers & Drivers Hall Effect Control
Data Sheet
Negotiable 
L4978D
L4978D
STMicroelectronics
Switching Converters, Regulators & Controllers 3.3 to 50V Step-Down
Data Sheet
0-1: $2.21
1-10: $2.05
10-100: $1.60
100-250: $1.46
L4976D013TR
L4976D013TR
STMicroelectronics
Switching Converters, Regulators & Controllers 3.3 to 50V Step-Down
Data Sheet
0-605: $1.60
605-1000: $1.34
1000-2000: $1.25
2000-5000: $1.18
L4971
L4971
STMicroelectronics
Switching Converters, Regulators & Controllers 3.3 to 50V Step-Down
Data Sheet
0-1: $1.67
1-10: $1.57
10-100: $1.47
100-250: $1.39