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TPS51275CRUKT
Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs
TPS51275, TPS51275B, TPS51275C
www.ti.com SLUSB45B –JUNE 2012–REVISED MARCH 2013
Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs
1FEATURES APPLICATIONS Input Voltage Range:5Vto24V • Notebook Computers Output Voltages:5V and 3.3V (Adjustable • Tablet Computers
Range ±10%)
DESCRIPTION• Built-in, 100-mA, 5-V and 3.3-V LDOsThe TPS51275, TPS51275B and TPS51275C are
• Clock Output for Charge-Pump cost-effective, dual-synchronous buck controllers
• ±1% Reference Accuracy targeted for notebook system-power supply solutions.
Adaptive On-Time D-CAP™ Mode Control It provides 5-V and 3.3-V LDOs and requires few
external components. The 260-kHz VCLK output can
Architecture with 300-kHz and 355-kHz usedto drivean external charge pump, generating
Frequency Settinggate drive voltage for the load switches without
• Auto-skip Light Load Operation (TPS51275, reducing the main converter efficiency. The
and TPS51275C) TPS51275, TPS51275B and TPS51275C supports
• OOA Light Load Operation (TPS51275B) high efficiency, fast transient response and providesa
combined power-good signal. Adaptive on-time, D-
• Internal 0.8-ms Voltage Servo Soft-StartCAP™ control provides convenient and efficient
• Low-Side RDS(on) Current Sensing Scheme operation. The device operates with supply input
• Built-In Output Discharge Function voltage ranging from5Vto 24V and supports output
voltages of 5.0 V and 3.3 V. The TPS51275,
• Separate Enable Input for SwitchersTPS51275B and TPS51275C are availableina 20-
• Dedicated OC Setting Terminals pin,3 mmx3 mm, QFN package andis specified
• Power Good Indicator from –40°Cto 85°C.
OVP, UVP and OCP Protection Non-Latch UVLO and OTP Protection 20-Pin,3 mmx3 mm, QFN (RUK)
NEED SOME SPACE
ORDERING INFORMATION(1)
