Application Circuits
Typical Application Circuits
MAX14914 MAX14914A MAX14914B
MAX14914
MAX14914A
MAX14914B
Open-Drain Fault Output. The FAULT transistor turns on when a fault condition (driver thermal shutdown or loss of ground) occurs. Connect a pullup to VL or V5.
FAULT
FAULT
Switch Control Input. Drive IN high to close the HS switch; drive IN low to open the HS switch and close the LS switch (when PP = low).
IN
IN
Supply Voltage, Nominally 24V. Bypass VDD to GND through a 1uF capacitor.
VDD
V
DD
Analog Supply Voltage/LDO Output. The MAX14914 requires a 5V supply for normal operation, which can come from the internal linear regulator (REGIN connected to VDD) or from an external regulator (REGIN connected to V5). Bypass to GND through a 1μF ceramic capacitor.
V5
V
5
Logic Supply Input. VL defines the levels on all I/O logic interface pins. Bypass VL to GND through a 100nF ceramic capacitor.
VL
V
L
High-Side / Push-Pull Output (DI_EN = low) or Digital Input (DI_EN = high). Connect both DOI pins together externally.
DOI
DOI
Analog Ground
GND
GND
Open-Drain DOI Level Output. DOI_LVL is logic-low when DOI voltage is higher than the threshold voltage. DOI_LVL is logic-high (using a pullup resistor) when DOI voltage is lower than the threshold voltage. The threshold voltage depends on DI_EN. Connect a pullup to VL or V5.
DOI_LVL
DOI_LVL
40V
40
V
Digital Input Mode Logic Enable Input. Set DI_EN high to enable digital input operation on the DOI pin, which enables the internal current sink and sets Type 1, Type 2, or Type 3 thresholds on DOI_LVL. Select between Type 1 and 3, and Type 2 DI characteristics through the PP input.
DI_EN
DI_EN
Push-Pull DO or DI Type Select Input. In DO mode, set PP high to enable push-pull mode operation of the DO driver. In DI mode, set PP low for IEC Type 1/3 input characteristics and set high for Type 2 input characteristics.
PP
PP
Power Ground
PGND
PGND
5V Regulator Input. Connect REGIN to VDD when using the internal 5V regulator. Connect REGIN to V5 when powering V5 from an external regulator.
REGIN
REGIN
24V
24V
DO/DI
DO/DI
High-Side / Push-Pull Output (DI_EN = low) or Digital Input (DI_EN = high). Connect both DOI pins together externally.
DOI
DOI
Current Limit Set Input. Connect a resistor from CLIM to GND to set the current limit. See Detailed Description for further information.
CLIM
CLIM
