LT8210 datasheet(16/59 Pages) AD

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Data Sheet

LT8210-1

analog.com

Rev. A

16 of 59

NAME

DESCRIPTION

When operating in the boost region or within the pass-thru window, TG1 pin

is held roughly at VIN+ GATEVCC continuously.

Pin 30, 31

SNSN1,

SNSP1

Positive (+) and Negative (–) Inputs for the Inductor Current Sense Amplifier.

Place an appropriately valued shunt resistor in series with the inductor on

the SW1 side and connect to SNSP1 and SNSN1. The SNSP1 – SNSN1 voltage

is used for current mode control and reverse current detection.

Pin 33

VINP

Protected Main Input Supply. This pin must connect to the drain terminal of

switch A. Use a small RC low-pass filter (e.g., 1Ω and 1µF) for improved jitter

performance. When reverse input protection is implemented, connect this

pin to the drain of the DG MOSFET; otherwise, connect to VIN.

Pin 34

Reverse Input Protection Gate Drive Output. When VINis pulled below –1.2V,

this pin is clamped internally to VIN with a low resistance switch, forcing an

external MOSFET between the VIN and VINP pins into cutoff. In normal

operation, this pin is charged to roughly VIN + GATEVCC with an internal

charge pump to fully enhance the external MOSFET. DG can tolerate

negative voltages down to –40V.

Pin 35

VIN

Input Voltage Pin. This pin is used for powering the start-up circuitry and the

internal charge pump. VIN can withstand negative voltages down to –40V

without damaging the regulator or drawing large currents.

Pin 37

EN/UVLO

Precision Enable Input. The part is enabled when this pin is pulled above

1.45V. A voltage below 1.35V causes the LT8210-1 to reside in a low-power

shutdown mode. Tie to VIN for always-on operation. Connect to a resistor

divider between VIN and ground to set an undervoltage lockout threshold.

EN/UVLO can tolerate negative voltages up to 40V.

Pin 39

MODE2

Operating Mode Selection Input #2. Used in conjunction with the MODE1 pin

to select between continuous conduction switching (CCM), discontinuous

switching (DCM), and pass-thru operating modes. See Table 1 in the

Operation section for mode pin settings.

Pin 40

MODE1

Operating Mode Selection Input #1. Used in conjunction with MODE2 pin to

select between continuous conduction switching (CCM), discontinuous

switching (DCM), and pass-thru operating modes. See Table 1 in the

Operation section for mode pin settings.

Pin 41/Exposed

Pad

GND

Signal Ground. All small-signal components and compensation components

should connect to this ground, which in turn connects to the PCB ground at

one location away from high currents and switching noise. The exposed pad

must be soldered to the PCB and connected to the GND pin using top layer

metal.

LT8210 Datasheet(PDF) 16 Page - Analog Devices

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