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TPS51225CRUKR
Dual Synchronous Step-Down Controller with 5-V and 3.3-V LDOs 20-WQFN -40 to 85
TPS51225, TPS51225B, TPS51225C
www.ti.com SLUSAV0B –JANUARY 2012–REVISED SEPTEMBER 2012
Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs
Checkfor Samples: TPS51225, TPS51225B, TPS51225C
1FEATURES APPLICATIONS Input Voltage Range: 5.5Vto24V • Notebook Computers Output Voltages:5V and 3.3V (Adjustable • Netbook, Tablet Computers
Range ±10%)
DESCRIPTION• Built-in, 100-mA, 5-V and 3.3-V LDOsThe TPS51225/B/C is a cost-effective, dual-
• Clock Output for Charge-Pump synchronous buck controller targeted for notebook
• ±1% Reference Accuracy system-power supply solutions.It provides 5-V and
Adaptive On-time D-CAP™ Mode Control 3.3-V LDOs and requires few external components.
The 260-kHz VCLK output can be usedto drive an
Architecture with 300kHz/355kHz Frequencyexternal charge pump, generating gate drive voltage
Settingfor the load switches without reducing the main
• Auto-skip Light Load Operation (TPS51225/C) converter efficiency. The TPS51225/B/C supports
• OOA Light Load Operation (TPS51225B) 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 with operation. The device operates with supply input
4500 ppm/°C Temperature Coefficient voltage ranging from 5.5Vto 24V and supports
• Built-in Output Discharge Function output voltages of 5.0 V and 3.3 V. The
TPS51225/B/Cis availableina 20-pin,3 mm×3
• Separate Enable Input for Switchersmm, QFN package andis specified from –40°Cto
(TPS51225/B/C) 85°C.
• Dedicated OC Setting Terminals Power Good Indicator OVP/UVP/OCP Protection Non-latch UVLO/OTP Protection 20-Pin,3 mm×3 mm, QFN (RUK)
ORDERING INFORMATION(1)
