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Technical content

Features

„ Continuous Loading: 2A (Buck 1), 1A (Buck 2 and 3) „ 1MHz Switching Frequency „ 1.0V ± 2% Voltage Reference Over Temperature „ External Enable/Sequencing and Soft Start Pins „ Adjustable Soft Start „ Power Good Output „ Cycle by Cycle Current Limit, Thermal and Overload protection. „ Built in 300mA LDO „ Thermally Enhanced 4mm × 4mm 28-pin QFN

Applications

„ Set Top Boxes „ Blue-ray DVD General Description The G5175 device features three synchronous 5.5V input range high efficiency buck converters. The con- verters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application. The converters can operate in 5V systems and have integrated power transistors. The output voltage can be set externally using a resistor divider to any value between 1.0V and close to the input supply. Each converter features enable pin that allows a delayed start-up for sequencing purposes, soft start pin that allows adjustable soft-start time by choosing the soft-start capacitor. The current mode control allows a simple RC compensation. The switching frequency of the converters can operate 1 MHz. The G5175 features a supervisor circuit that monitors each converter output. The PGOOD pin is asserted once sequencing is done, all PG signals are reported and a selectable end of reset time lapses. The polarity of the PGOOD signal is active high. The G5175 Buck1 also features a light load pulse skipping mode, PSM mode allows for a reduction on the input power supplied to the system when the host processor is in stand-by (low activity) mode.

Ordering Information

NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5175RV1U 5175 -40 °C to +85°C TQFN4X4-28 Note: RV: TQFN4X4-28 1: Bonding Code U: Tape & Reel Pin Configuration Typical Application Circuit G5175 VIN EN PGOOD GND EP V33P CI33 V33 CO33 3.3V MODE SS1 COMP1 FB1 LX1 BS1 CO1 CBS1 1.2V CSS1 RC1 CC1 PVCC1 CI1 5VEN1 CZ1 SS2 COMP2 FB2 LX2 CO2 1.5V CSS2 RC2 CC2 PVCC2EN2 CZ2 CD1 CI2 R3 CD2 SS3 COMP3 FB3 LX3 CO3 3.3V CSS3 RC3 CC3 PVCC3EN3 CZ3 CI3 R5 CD3 CEN1 CI RPG CI0 RI CIN CO331 CI11 CI21 CI31 G5175 TQFN4X4-28 EN3 PVCC3 LX3 MODE LX2 PVCC2 V33 PGOOD BS1 PVCC1 PVCC1 LX1 6 16 GND FB3 V33P VIN COMP3 SS3 25FB1 EN1 FB2 COMP1 SS1 Thermal Pad (PGND) SS2 COMP2 EN215 EN28 LX1 Note: Recommend connecting the Thermal Pad to the round for excellent power dissipation. G5175 TQFN4X4-28 EN3 PVCC3 LX3 MODE LX2 PVCC2 V33 PGOOD BS1 PVCC1 PVCC1 LX1 6 16 GND FB3 V33P VIN COMP3 SS3 25FB1 EN1 FB2 COMP1 SS1 Thermal Pad (PGND) SS2 COMP2 EN215 EN28 LX1 Note: Recommend connecting the Thermal Pad to the round for excellent power dissipation.