The TPS54232 is a 28-V, nonsynchronous buck converter that integrates a low RDS(on) high-side MOSFET. To increase efficiency at light loads, a pulse-skipping Eco-Mode feature is automatically activated. Furthermore, the 1-μA shutdown supply current allows the device to be used in battery-powered applications. Current mode control with internal slope compensation simplifies the external compensation calculations and reduces component count while allowing the use of ceramic output capacitors. A resistor divider programs the hysteresis of the input undervoltage lockout. An overvoltage transient protection circuit limits voltage overshoots during startup and transient conditions. A cycle-by-cycle current limit scheme, frequency fold back, and thermal shutdown protect the device and the load in the event of an overload condition. The TPS54232 is available in an 8-pin SOIC package.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS54232 | SOIC (8) | 4.90 mm x 3.90 mm |
Changes from C Revision (October 2013) to D Revision
Changes from B Revision (February 2011) to C Revision
Changes from A Revision (March 2010) to B Revision
Changes from * Revision (November 2008) to A Revision
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
BOOT | 1 | O | A 0.1-μF bootstrap capacitor is required between BOOT and PH. If the voltage on this capacitor falls below the minimum requirement, the high-side MOSFET is forced to switch off until the capacitor is refreshed. |
VIN | 2 | I | Input supply voltage, 3.5 V to 28 V. |
EN | 3 | I | Enable pin. Pull below 1.25 V to disable. Float to enable. Programming the input undervoltage lockout with two resistors is recommended. |
SS | 4 | I | Slow start pin. An external capacitor connected to this pin sets the output rise time. |
VSENSE | 5 | I | Inverting node of the gm error amplifier. |
COMP | 6 | O | Error amplifier output, and input to the PWM comparator. Connect frequency compensation components to this pin. |
GND | 7 | - | Ground. |
PH | 8 | O | The source of the internal high-side power MOSFET. |