2017-2020 Microchip Technology Inc. DS20005826B-page 1
HV256
Features
• Thirty-two Independent High-voltage Amplifiers
• 300V Operating Voltage
• 295V Output Voltage
• 2.2V/µs Typical Output Slew Rate
• Adjustable Output Current Source Limit
• Adjustable Output Current Sink Limit
• Internal Closed-loop Gain of 72V/V
• 12 MΩ Feedback Impedance
• Layout Ideal for Die Applications
Applications
• Microelectromechanical Systems (MEMS) Driver
• Piezoelectric Transducer Driver
• Optical Crosspoint Switches                             
(Using MEMS Technology)
General Description
The  HV256  is  a  32-channel,  high-voltage  amplifier
array  integrated  circuit.  It  operates  on  a  single
high-voltage  supply, up to  300V, and two  low-voltage
supplies, VDD and VNN.
The  input  voltage  range  is  from  0V  to  4.096V.  The
internal  closed-loop  gain  is  72V/V,  giving  an  output
voltage of 295V when 4.096V is applied. Input voltages
of up to 5V can be applied but will cause the output to
saturate.  The  maximum  output  voltage  swing  is  5V
below  the  VPP  high-voltage  supply.  The  outputs  can
drive capacitive loads of up to 3000 pF.
The maximum output source and sink currents can be
adjusted  by  using  two  external  resistors. An  external
RSOURCE  resistor  controls  the  maximum  sourcing
current,  and  an  external  R
SINK  resistor  controls  the
maximum  sinking  current.  The  current  limit  is
approximately  12.5V  divided  by  the  external  resistor
value.  The  setting  is  common  for  all  32  outputs.  A
low-voltage silicon junction diode is made available to
help monitor the die temperature.
Package Type