LM5005

·Integrated 75V, 2.5A N-Channel Buck Switch
·Ultra-wide input voltage range from 7V to 75V
· Internal high voltage bias regulator
· Adjustable output voltage from 1.225V
·1.5% feedback reference accuracy
· Current mode control with emulated inductor current ramp
· Single resistor oscillator frequency setting
·Oscillator synchronization input
· Programmable soft-start
· Shutdown / Standby input
·Wide bandwidth error amplifier
· Thermal Shutdown

V_IN to GND ..................................................................76V
BST to GND ..................................................................90V
PRE to GND ..................................................................76V
SW to GND (Steady State) .........................................-1.5V
BST to V_CC ....................................................................76V
V_CC to GND ...................................................................14V
BST to SW .....................................................................14V
OUT to GND ....................................................Limited to Vin
SD, SYNC, SS, FB to GND .................................................8V
ESD Rating (Note 2)
Human Body Model ........................................................2kV
Storage Temperature Range ..................-65°C to +150°C

The LM5005 high voltage switching regulator features all of
the functions necessary to implement an efficient high voltage
buck regulator using a minimum of external components.
This easy to use regulator includes a 75V N-Channel buck switch with an output current capability of 2.5 Amps.

The regulator control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation.

The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.

The operating frequency is programmable from 50kHz to 500kHz. An oscillator synchronization pin allows multiple LM5005 regulators to self-synchronize or to be synchronized to an external clock. Additional protection features include: current limit, thermal shutdown and remote shutdown capability. The device is available in a power enhanced TSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.