LTC4446EMS8E-TRPBF datasheet(6/12 Pages) LINER

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LTC4446

4446f

PIN FUNCTIONS

BLOCK DIAGRAM

TINP (Pin 1): High Side Input Signal. Input referenced

to GND. This input controls the high side driver output

(TG).

BINP (Pin 2): Low Side Input Signal. This input controls

the low side driver output (BG).

VCC (Pin 3): Supply. This pin powers input buffers, logic

and the low side gate driver output directly and the high

side gate driver output through an external diode con-

nected between this pin and BOOST (Pin 6). A low ESR

ceramic bypass capacitor should be tied between this pin

and GND (Pin 9).

BG (Pin 4): Low Side Gate Driver Output (Bottom Gate).

This pin swings between VCC and GND.

NC (Pin 5): No Connect. No connection required.

BOOST (Pin 6): High Side Bootstrapped Supply. An ex-

ternal capacitor should be tied between this pin and TS

(Pin 8). Normally, a bootstrap diode is connected between

VCC (Pin 3) and this pin. Voltage swing at this pin is from

VCC – VD to VIN + VCC – VD, where VD is the forward volt-

age drop of the bootstrap diode.

TG (Pin 7): High Side Gate Driver Output (Top Gate). This

pin swings between TS and BOOST.

TS (Pin 8): High Side MOSFET Source Connection (Top

Source).

Exposed Pad (Pin 9): Ground. Must be soldered to PCB

ground for optimal thermal performance.

TIMING DIAGRAM

HIGH SIDE

LEVEL SHIFTER

VCC UVLO

LDO

VINT

VCC

GND

7.2V TO

13.5V

BOOST

VIN

UP TO 100V

4446 BD

TINP

BINP

LOW SIDE

LEVEL SHIFTER

VCC

90%

INPUT RISE/FALL TIME < 10ns

TINP (BINP)

BG (TG)

BINP (TINP)

TG (BG)

90%

tPHL

tPLH

10%

4444 TD

10%

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