LT1158CS datasheet(5/20 Pages) LINER

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LT1158

SUPPLY VOLTAGE (V)

200

250

300

LT1158 G13

150

100

400

350

CGATE = 10000pF

CGATE = 1000pF

CGATE = 3000pF

515

Top Gate Rise Time

Top Gate Fall Time

SUPPLY VOLTAGE (V)

200

250

300

LT1158 G14

150

100

400

350

CGATE = 10000pF

CGATE = 1000pF

CGATE = 3000pF

515

Transition Times vs RGate

GATE RESISTANCE (

Ω)

600

800

LT1158 G15

400

200

100

700

500

300

100

V+ = 12V

CGATE = 3000pF

RISE TIME

FALL TIME

Pin 1 (Boost Drive): Recharges and clamps the bootstrap

capacitor to 14.5V higher than pin 13 via an external diode.

Pin 2 (V

+): Main supply pin; must be closely decoupled to

the ground pin 7.

Pin 3 (Bias): Decouple point for the internal 2.6V bias

generator.

Pin 3 cannot have any external DC loading.

Pin 4 (Enable): When left open, the LT1158 operates

normally. Pulling pin 4 low holds both MOSFETs off

regardless of the input state.

Pin 5 (Fault): Open collector NPN output which turns on

when V12 – V11 exceeds the fault conduction threshold.

Pin 6 (Input): Taking pin 6 high turns the top MOSFET on

and bottom MOSFET off; pin 6 low reverses these states.

An input latch captures each low state, ignoring an ensu-

ing high until pin 13 has gone below 2.6V.

Pin 8 (Bottom Gate Feedback): Must connect directly to

the bottom power MOSFET gate. The top MOSFET turn-on

is inhibited until pin 8 has discharged to 1.5V. A hold-on

current source also feeds the bottom gate via pin 8.

Pin 9 (Bottom Gate Drive): The high current drive point

for the bottom MOSFET. When a gate resistor is used, it is

inserted between pin 9 and the gate of the MOSFET.

PI FU CTIO S

Pin 10 (V

+): Bottom side driver supply; must be con-

nected to the same supply as pin 2.

Pin 11 (Sense Negative): The floating reference for the

current limit comparator. Connects to the low side of a

current shunt or Kelvin lead of a current-sensing MOSFET.

When pin 11 is within 1.2V of V

+, current limit is inhibited.

Pin 12 (Sense Positive): Connects to the high side of the

current shunt or sense lead of a current-sensing MOSFET.

A built-in offset between pins 11 and 12 in conjunction

with RSENSE sets the top MOSFET short-circuit current.

Pin 13 (Top Source): Top side driver return; connects to

MOSFET source and low side of the bootstrap capacitor.

Pin 14 (Top Gate Feedback): Must connect directly to the

top power MOSFET gate. The bottom MOSFET turn-on is

inhibited until V14 – V13 has discharged to 1.75V. An on-

chip charge pump also feeds the top gate via pin 14.

Pin 15 (Top Gate Drive): The high current drive point for

the top MOSFET. When a gate resistor is used, it is inserted

between pin 15 and the gate of the MOSFET.

Pin 16 (Boost): Top side driver supply; connects to the

high side of the bootstrap capacitor and to a diode either

from supply (V

+ < 10V) or from pin 1 (V+ > 10V).

TYPICAL PERFORMANCE CHARACTERISTICS

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