MAX4825EUP Maxim Integrated Products, MAX4825EUP Datasheet - Page 14

• Manufacturer Part Number: MAX4825EUP
• Description: MOSFET & Power Driver ICs
• Manufacturer: Maxim Integrated Products

Specifications of MAX4825EUP

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

where N is the total number of MAX4822 devices in a
single chain, and R
n-channel MOSFET in s.
For example, if N = 10:
An n-channel MOSFET with R
required for a daisy chain of 10 MAX4822 devices.
+3.3V/+5V, 8-Channel Relay Drivers with Fast
Recovery Time and Power-Save Mode
Figure 8. Daisy-Chain Configuration
Figure 9. Daisy-Chained MAX4822s with a Capacitor Connected to PSAVE
14
SCLK
SCLK
0.47 F
DIN
______________________________________________________________________________________
CS
CS
DIN
DIN
SCLK
CS
MAX4823
DIN
SCLK
PSAVE
GND
V
V
CS
CC
CC
R
ON
MAX4822
ON
0.1 F
DOUT
PGND
OUT8
V
V
GND
OUT1
CC
CC
is the on-resistance of the
< 142
0.1 F
DOUT
PGND
OUT8
OUT1
ON
less than 142
0.47 F
SCLK
DIN
SCLK
CS
is
DIN
SCLK
MAX4823
PSAVE
CS
V
GND
V
CC
CC
MAX4822
The MAX4822–MAX4825 feature built-in inductive kick-
back protection to reduce the voltage spike on OUT_
generated by a relay’s coil inductance when the output
is suddenly switched off. An internal Zener clamp
allows the inductor current to flow back to ground. The
Zener configuration significantly reduces the recovery
time (time it takes to turn off the relay) when compared
to protection configurations with just one diode across
the coil.
V
V
GND
CC
CC
0.1 F
DOUT
OUT8
PGND
OUT1
0.1 F
DOUT
PGND
OUT8
OUT1
Inductive Kickback Protection with
0.47 F
SCLK
DIN
SCLK
CS
Fast Recovery Time
DIN
PSAVE
SCLK
CS
MAX4823
GND
MAX4822
V
V
CC
CC
V
V
GND
CC
CC
0.1 F
DOUT
OUT8
PGND
OUT1
0.1 F
DOUT
PGND
OUT8
OUT1