Product Summary

The LM556CM is a Step Down Switching Regulator. It features all of the functions needed to implement low cost, efficient, Buck bias regulators. This high voltage regulator contains an 80 V, 0.7A N-Channel Buck Switch. The applications of the LM556CM are (1)Non-Isolated Buck Regulator; (2)Secondary High Voltage Post Regulator; (3)+42V Automotive Systems.

Parametrics

LM556CM absolute maximum ratings: (1)VIN to GND: 80V; (2)BST to GND: 94V; (3)SW to GND (Steady State): -1V; (4)ESD Rating: 200V; (5)BST to VCC: 80V; (6)BST to SW: 14V; (7)VCC to GND: 14V; (8)All Other Inputs to GND: -0.3 to 7V; (9)Lead Temperature (Soldering 4 sec): 260℃; (10)Storage Temperature Range: -55 to +150℃.

Features

LM556CM features: (1)Integrated 80V, 0.7A N-Channel Buck Switch; (2)Internal HV Vcc Regulator; (3)No Control Loop Compensation Required; (4)Ultra-Fast Transient Response; (5)On Time Varies Inversely with Line Voltage; (6)Operating Frequency Nearly Constant with Varying Line Voltage; (7)Adjustable Output Voltage; (8)Highly Efficient Operation; (9)Precision Reference; (10)Low Bias Current; (11)Intelligent Current Limit Protection; (12)Thermal Shutdown; (13)External Shutdown Control.

Diagrams

LM556CM block diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
LM556CM
LM556CM
National Semiconductor (TI)
Timers & Support Products
Data Sheet
0-770: $0.40
770-1045: $0.36
1045-2530: $0.36
2530-5005: $0.32
LM556CM/NOPB
LM556CM/NOPB
National Semiconductor (TI)
Timers & Support Products Dual Timer
Data Sheet
0-1: $0.85
1-25: $0.67
25-100: $0.59
100-250: $0.52
LM556CMX/NOPB
LM556CMX/NOPB
National Semiconductor (TI)
Timers & Support Products
Data Sheet
0-1: $0.92
1-25: $0.72
25-100: $0.65
100-250: $0.57
LM556CMX
LM556CMX
National Semiconductor (TI)
Timers & Support Products
Data Sheet
0-2500: $0.36
2500-5000: $0.32
5000-10000: $0.30