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power management ic,
integrated circuit components
MAX4820EUP+T Maxim Integrated Gate Drivers
The MAX4820/MAX4821 8-channel relay drivers offer
built-in kickback protection and drive +3.3V/+5V nonlatching
or dual-coil-latching relays. These devices are
especially useful when driving +3V relays. Each independent
open-drain output features a 2Ω on-resistance
and is guaranteed to sink 70mA (min) of load current.
Both devices consume less than 50μA (max) quiescent
current and have 1μA output off-leakage current.
The MAX4820 features an SPI™-/QSPI™-/MICROWIRE™-
compatible serial interface. Input data is shifted into an 8-
bit shift register and latched to the outputs when CS
transitions from low to high. Each data bit in the shift register
corresponds to a specific output, allowing independent
control of all outputs.
The MAX4821 features a 4-bit (A0, A1, A2, LVL) parallel-
input interface. The first three bits (A0, A1, A2) determine
the output address, and the fourth bit (LVL)
determines whether the selected output is switched on
or off. Data is latched to the outputs when CS transitions
from low to high.
Both devices feature separate set and reset functions
that allow the user to turn on or turn off all outputs simultaneously
with a single control line. Built-in hysteresis
(Schmidt trigger) on all digital inputs allows this device
to be used with slow rising and falling signals, such as
those from optocouplers or RC power-up initialization
circuits. The MAX4820/MAX4821 are available in 20-pin
TSSOP and space-saving 20-pin Thin QFN packages.
8 Independent Output Channels
♦ Built-In Inductive Kickback Protection
♦ Drive +3V and +5V Relays
♦ Guaranteed 70mA (min) Coil Drive Current
♦ SET Function to Turn On All Outputs
♦ RESET Function to Turn Off All Outputs
♦ SPI-/QSPI-/MICROWIRE-Compatible Serial
♦ Serial Digital Output for Daisy Chaining
♦ Parallel Interface (MAX4821)
♦ Low 50μA (max) Quiescent Supply Current
♦ Space-Saving 20-Pin Thin QFN Package
PART TEMP RANGE PIN-PACKAGE
MAX4820ETP+ -40°C to +85°C 20 Thin QFN-EP*
MAX4820EUP+ -40°C to +85°C 20 TSSOP-EP*
MAX4821ETP+ -40°C to +85°C 20 Thin QFN-EP*
MAX4821EUP+ -40°C to +85°C 20 TSSOP-EP*
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