TPS51225, TPS51225B, TPS51225C
1FEATURES APPLICATIONS
2• Input Voltage Range: 5.5 V to 24 V • Notebook Computers
• Output Voltages: 5 V and 3.3 V (Adjustable • Netbook, Tablet Computers
Range ±10%)
• Built-in, 100-mA, 5-V and 3.3-V LDOs DESCRIPTION
The 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-CAPTM Mode Control 3.3-V LDOs and requires few external components.
Architecture with 300kHz/355kHz Frequency The 260-kHz VCLK output can be used to drive an
Setting external charge pump, generating gate drive voltage
for 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 provides a
• Internal 0.8-ms Voltage Servo Soft-Start combined power-good signal. Adaptive on-time, D-
CAPTM 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 5.5 V to 24 V and supports
• Built-in Output Discharge Function output voltages of 5.0 V and 3.3 V. The
• Separate Enable Input for Switchers TPS51225/B/C is available in a 20-pin, 3 mm × 3
(TPS51225/B/C) mm, QFN package and is specified from –40°C to
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)
download TPS51225, TPS51225B, TPS51225C.pdf
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