Datasheet

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General Description

The MAX4896 8-channel relay and load driver is designed

for medium voltage applications up to 50V. This device is

offered in a 20-pin, 5mm x 5mm TQFN package, resulting

in substantial board space savings.

The MAX4896 8-channel relay driver offers built-in induc-

tive kickback protection, drive for latching/nonlatching

or dual-coil relays, and open-load and short-circuit fault

detection.The MAX4896 also protects against overcur-

rent conditions. Each independent open-drain output fea-

tures a 3Ω (typ) on-resistance, and is guaranteed to sink

200mA of load current (V

≥ 4.5V).

A built-in overvoltage protection clamp handles kickback-

voltage transients, which are common when driving induc-

tive loads. Thermal-shutdown circuitry shuts off all outputs

(OUT_) when the junction temperature exceeds +160°C.

The MAX4896 employs a reset input that allows the user to

turn off all outputs simultaneously with a single control line.

The MAX4896 includes a 10MHz SPI™-/QSPI™-/

MICROWIRE™-compatible serial interface. The serial inter-

face is compatible with TTL-/CMOS-logic voltage levels and

operates with a single +2.7V to +5.5V supply. In addition,

the SPI output data can be used for diagnostics purposes

including open-load and shortcircuit fault detection.

The MAX4896 is offered in the extended (-40°C to +85°C) and

automotive (-40°C to +125°C) operating temperature ranges.

Features

● Supports Up to 50V Continuous Drain-to-Source

Voltage

● Guaranteed Drive Current:

• V

≥ 4.5V

200mA (All Channels On)

410mA (Individual Channels)

• V

≤ 3.6V

100mA

● Built-In Output Clamp Protects Against Inductive

Kickback

● +2.7V to +5.5V Logic Supply Voltage

● RESET Input Turns Off All Outputs Simultaneously

● Built-in Power-On Reset

● Automotive Temperature Range (-40°C to +125°C)

● SPI-/QSPI-/MICROWIRE-Compatible Serial Interface

● Serial Digital Output for Daisy Chaining and

Diagnostics

● FLAG Output for μP Interrupt

● Open-Load and Short-Circuit Detection and Protection

● Thermal Shutdown

● Low 100μA (max) Quiescent Supply Current

● Space-Saving, 5mm x 5mm, 20-Pin TQFN Package

Applications

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

● Industrial Equipment

● White Goods

● Power-Grid Monitoring

and Protection Equipment

● ATE

Pin Configuration appears at end of data sheet.

*EP = Exposed pad.

+Denotes lead(Pb)-free/RoHS-compliant package.

PART TEMP RANGE PIN-PACKAGE

MAX4896ETP+ -40°C to +85°C

20 TQFN-EP*

(5mm x 5mm)

MAX4896ATP+ -40°C to +125°C

20 TQFN-EP*

(5mm x 5mm)

MAX4896

OUT8

SCLK

DIN

RESET

DOUT

PGNDGNDSLPD

= 2.7V TO 5.5V

0.1µF

RELAY

COIL 8

OUT1

PDCD

RELAY

FLAG

µC

INT

RELAY

COIL 1

MAX4896 Space-Saving, 8-Channel Relay/Load Driver

19-3843; Rev 4; 5/14

Typical Operating Circuit

Ordering Information

Summary of content (13 pages)

PAGE 1
MAX4896 Space-Saving, 8-Channel Relay/Load Driver General Description The MAX4896 8-channel relay and load driver is designed for medium voltage applications up to 50V. This device is offered in a 20-pin, 5mm x 5mm TQFN package, resulting in substantial board space savings. The MAX4896 8-channel relay driver offers built-in inductive kickback protection, drive for latching/nonlatching or dual-coil relays, and open-load and short-circuit fault detection.
PAGE 2
MAX4896 Space-Saving, 8-Channel Relay/Load Driver Absolute Maximum Ratings (All voltages referenced to GND.) VS..........................................................................-0.3V to +7.0V OUT_................................................................... (-0.3V to +50V) Continuous OUT_ Voltage ..................................................+50V CS, SCLK, DIN, RESET, SPLD, PDCD................-0.3V to +7.0V DOUT...........................................................-0.3V to (VS + 0.
PAGE 3
MAX4896 Space-Saving, 8-Channel Relay/Load Driver Electrical Characteristics (continued) (VS = +2.7V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX 5 6 UNITS RELAY OUTPUT DRIVERS (OUT1–OUT8) IOUT = 50mA, VS = 2.7V OUT_ ON Resistance RON IOUT = 100mA, VS = 4.
PAGE 4
MAX4896 Space-Saving, 8-Channel Relay/Load Driver Electrical Characteristics (continued) (VS = +2.7V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3) PARAMETER SYMBOL CONDITIONS TA = +85°C SCLK Frequency fSCLK TA = +125°C Cycle Time tCH + tCL CS Fall-to-SCLK Rise Setup tCSS CS Rise-to-SCLK Hold tCSH SCLK High Time tCH SCLK Low Time tCL Data Setup Time tDS Data Hold Time tDH SCLK Fall-to-DOUT Valid tDO 2.7V ≤ VS < 3.6V MIN 0 4.
PAGE 5
MAX4896 Space-Saving, 8-Channel Relay/Load Driver Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) TA = -40°C VS = 5V 4.0 VS = 3.3V 3.1 3.5 3.9 4.3 4.7 5.5 0.1 1 VS = 3.3V 4 3 VS = 5V 2 VS = 2.7V 5 VS = 3.3V VS = 5V 4 3 VS = 5.5V VS = 5.5V 2 1 -40 -25 -10 5 20 35 50 65 80 95 110 125 MAX4896 toc03 3.1 3.5 3.9 4.3 4.7 5.1 2.14 2.12 2.10 2.08 2.06 2.04 2.02 2.
PAGE 6
MAX4896 Space-Saving, 8-Channel Relay/Load Driver Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) tOFF 1.5 1.0 tON 0.5 66.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.0 2.5 tOFF 2.0 1.5 1.0 0 4.7 4.9 5.1 700 650 TA = +85°C 600 550 TA = +125°C 500 5.3 400 5.5 4.5 4.7 4.9 5.1 5.3 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) OUT CLAMP VOLTAGE vs. TEMPERATURE BACK-EMF CLAMPING WITH STANDARD +12V RELAY BACK-EMF CLAMPING WITH STANDARD +24V RELAY VS = 3.
PAGE 7
MAX4896 Space-Saving, 8-Channel Relay/Load Driver Pin Description PIN NAME 1 RESET 2 CS Chip Select Input. Drive CS low to select the device. When CS is low, data at DIN is clocked into the 8-bit shift register on SCLK’s rising edge. Drive CS from low to high to latch the data to the registers. 3 DIN Serial Data Input 4 SCLK Serial Clock Input 5 DOUT Serial Data Output. DOUT is the output of the 8-bit shift register. This output can be used to daisy chain multiple MAX4896s.
PAGE 8
MAX4896 Space-Saving, 8-Channel Relay/Load Driver Detail Description The MAX4896 is an 8-channel relay and load driver for medium voltage applications up to 50V. The MAX4896 features built-in inductive kickback protection, drive for latching/nonlatching, or dual-coil relays and an internal register for detecting open-load and short-circuit faults. Each independent open-drain output features a 3Ω onresistance and is guaranteed to sink 400mA at VS ≥ 4.5V, and 100mA at VS ≤ 3.6V.
PAGE 9
MAX4896 Space-Saving, 8-Channel Relay/Load Driver Table 1. Serial-Input Address DIN D0 D1 D2 D3 D4 D5 D6 D7 OUT_ OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8 Table 2. Serial-Output Address DIN DO0 DO1 DO2 DO3 DO4 DO5 DO6 DO7 OUT_ OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 OUT8 Table 3. Status-Register Output Diagnostic OUTPUT STATUS DO_STATUS BIT DIAGNOSTIC Off Low Normal operation. Off High Fault condition. Output open or short circuit. On Low Fault condition.
PAGE 10
MAX4896 Space-Saving, 8-Channel Relay/Load Driver The minimum fault-filtering time helps mask short-duration fault conditions, such as driving highly capacitive loads. The typical diagnostics software routine works as follows: ●● Write data to the MAX4896 ●● Wait for tD(FAULT) maximum to ensure diagnostics data is ready and valid ●● Write same data to the MAX4896 and read out the diagnostics data from the shift register Use Table 3 to diagnose the output state.
PAGE 11
MAX4896 Space-Saving, 8-Channel Relay/Load Driver VS VS 0.1µF 0.1µF DEVICE 1 DEVICE 2 VS DIN VS DIN DIN DOUT DOUT MAX4896 MAX4896 OUT1 SCLK SCLK CS OUT1 SCLK OUT8 GND OUT8 PGND GND CS PGND CS Figure 3.
PAGE 12
MAX4896 Space-Saving, 8-Channel Relay/Load Driver Pin Configuration OUT4 GND OUT5 OUT6 PROCESS: BiCMOS OUT3 TOP VIEW Chip Information 15 14 13 12 11 Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 13
MAX4896 Space-Saving, 8-Channel Relay/Load Driver Revision History REVISION NUMBER REVISION DATE 0 10/05 Initial release 1 6/07 Removal of future product notice 2 12/07 EP clarification 7 3 7/12 Updated FLAG Output section 10 4 5/14 Removed automotive reference under Applications section 1 DESCRIPTION PAGES CHANGED — - For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.