The TPS54227 device is an adaptive ON-time D-CAP2 mode synchronous buck converter. The TPS54227 enables system designers to complete the bus regulators for a suite of various end equipment with a cost-effective, low component count, low standby current solution. The main control loop for the TPS54227 uses the D-CAP2 mode control which provides a fast transient response with no external compensation components. The TPS54227 also has a proprietary circuit that enables the device to adopt to both low equivalent series resistance (ESR) output capacitors, such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors. The device operates from 4.5-V to 18-V VIN input. The output voltage can be programmed between 0.76 V and 7 V. The device also features an adjustable soft-start time. The TPS54227 is available in the 8-pin HSOP package and 10-pin VSON, and is designed to operate from –40°C to 85°C.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
TPS54227 | SO PowerPAD (8) | 4.89 mm × 3.90 mm |
VSON (10) | 3.00 mm × 3.00 mm |
Changes from B Revision (June 2013) to C Revision
Changes from A Revision (October 2011) to B Revision
Changes from * Revision (May 2010) to A Revision
PIN | I/O | DESCRIPTION | ||
---|---|---|---|---|
NAME | DDA | DRC | ||
EN | 1 | 1 | I | Enable input control. EN is active high and must be pulled up to enable the device. |
Exposed Thermal Pad | — | G | Thermal pad of the package. Must be soldered to achieve appropriate dissipation. Must be connected to GND. | |
— | Thermal pad of the package. PGND power ground return of internal low-side FET. Must be soldered to achieve appropriate dissipation. | |||
GND | 5 | 5 | G | Ground pin. Power ground return for switching circuit. Connect sensitive SS and VFB returns to GND at a single point. |
SS | 4 | 4 | O | Soft-start control. An external capacitor should be connected to GND. |
SW | 6 | 6, 7 | O | Switch node connection between high-side NFET and low-side NFET. |
VBST | 7 | 8 | I | Supply input for the high-side FET gate drive circuit. Connect 0.1-µF capacitor between VBST and SW pins. An internal diode is connected between VREG5 and VBST. |
VFB | 2 | 2 | I | Converter feedback input. Connect to output voltage with feedback resistor divider. |
VIN | 8 | 9, 10 | P | Input voltage supply pin. |
VREG5 | 3 | 3 | O | 5.5-V power supply output. A capacitor (typical 1 µF) should be connected to GND. VREG5 is not active when EN is low. |