ST L9856 User Manual

Features

■ High voltage rail up to 160 V

■ dV/dt immunity ±50 V/nsec in full temperature

range

■ Driver current capability:

500 mA source,
500 mA sink

■ Switching times 100 ns rise/fall with 2.5 nF load

■ CMOS/TTL Schmitt trigger inputs with

hysteresis

■ Under voltage lock out

■ Clamping on V

■ Loading circuit for external Bootstrap capacitor

■ Inverting input

■ Reset circuitry

■ SO-8 package

Table 1. Device summary

CC

L9856

High voltage high-side driver

SO-8

Description

The L9856 is an high voltage device,
manufactured with the BCD "OFF-LINE"
technology.

It has the capability of driving N-Channel Power
MOS transistors. The upper (floating) section is
enabled to work with voltage rail up to 160 V. The
logic Inputs are CMOS/TTL compatible for ease
of interfacing with controlling devices.

Order code Operating temp range, °CPackage Packing

L9856 -40 to +125 SO-8 Tube

L9856TR -40 to +125 SO-8 Tape and Reel

May 2008 Rev 2 1/14

www.st.com

1

Contents L9856

Contents

1 Block diagram andpin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.3 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.5 Logic table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3 Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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L9856 List of tables

List of tables

Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Table 2. Pin function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 4. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 5. Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 6. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 7. Logic table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 8. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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List of figures L9856

List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 2. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 3. Input/output timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 4. Reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 5. SO-8 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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L9856 Block diagram andpin description

1 Block diagram andpin description

1.1 Block diagram

Figure 1. Block diagram

V

B

Undervoltage

RESET

VB to VS

V

CC

Undervoltage

RESET VCC

to GND

Pulse Filter
FLIP FLOP

Break before

Make

H

V

S

O

RES-

IN-

GND

1.2 Pin description

Figure 2. Pin connection (top view)

Table 2. Pin function

Pin # Pin name Description

1V

2 IN- Driver control signal input (negative logic)

3 GND Ground

4 RESET- Driver enable signal input (negative logic)

CC

Logic

Pulse Filter

V

IN-

GND

RESET-

1

CC

2

3

4V

Driver supply, typical 5V

Level Shifter

"ON"

Level Shifter

"OFF"

8

7

6

5

V

B

H

O

NC

S

Delay

Recharge path

5VSMOSFET source connection

6 NC No connection (no bondwire)

7H

8V

O

B

MOSFET gate connection

Driver output stage supply

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