FEATURES
 Built-In Multiphase Current Sharing
 18μA Pass-Thru Mode IQ with 99.9% Efficiency
 Pass-Thru or Fixed Output CCM, DCM Operation
 Programmable Non-Switching Pass-Thru Window
 VIN Range: 2.8V to 100V (4.5V for Start-Up)
 VOUT Range: 1V to 100V
 Reverse Input Protection to -40V
 ±2% Output Voltage Accuracy (–40°C to 125°C)
 Programmable Current Limit
 10V Quad N-Channel MOSFET Gate Drivers
 ±20% Cycle-by-Cycle Inductor Current Limit
 No Top MOSFET Refresh Noise in Buck or Boost
 Fixed/Phase-Lockable Frequency: 80kHz to 400kHz
 Spread-Spectrum Frequency Modulation for Low EMI
 Power Good Output Voltage/Overcurrent Monitor
 Available in a 40-Lead (6mm x 6mm) QFN Package

APPLICATIONS
 Industrial, Telecom, Avionics Systems, Automotive
Qualification in Progress

GENERAL DESCRIPTION
The LT®8210-1 is a 4-switch synchronous buck-boost
DC/DC controller that can operate in pass-thru mode,
forced continuous conduction, or pulse-skipping mode.
Pass-Thru is a feature that passes the input directly to
the output when the input is within a user
programmable window. Pass-Thru mode eliminates
switching losses and EMI while maximizing efficiency.
For input voltages above or below the pass-thru
window, the buck or boost regulation loops maintain
the output at the set maximum or minimum values,
respectively. The LT8210-1 is pin compatible with the
LT8210. The IMON pin on the LT8210-1 has an ISHARE
function, which allows for masterless current sharing.
Multiple LT8210-1 can be connected in parallel for
higher output current and reduced voltage ripple. A
masterless closed loop current sharing loop balances
the current per phase and allows phase shedding.
Optional reverse input protection down to -40V can be
implemented with the addition of a single N-channel
MOSFET. The LT8210-1 includes a precision current
sense amplifier that can accurately monitor and limit
output or input average current.