1FEATURES APPLICATIONS
2• Input Voltage Range: 5 V to 24 V • Notebook Computers
• Output Voltages: 5 V and 3.3 V (Adjustable • Tablet Computers
Range ±10%)
• Built-in, 100-mA, 5-V and 3.3-V LDOs DESCRIPTION
The TPS51285A and TPS51285B are cost-effective, • Clock Output for Charge-Pump
dual synchronous buck controllers with 5-V and 3.3-V
• ±1% Reference Accuracy LDOs, targeted for notebook system-power supply
• Adaptive On-Time D-CAPTM Mode Control solutions. The device achieves low power
Architecture with 400 kHz (CH1) and 475 kHz consumption by the use of auto-skip and ULQTM
(CH2) Frequency modes, which is beneficial for long battery life in
system stand-by mode. The 256-kHz VCLK output is • Auto-skip and ULQTM modes for long battery provided to drive an external charge pump, life in system stand-by mode generating gate drive voltage for the load switches
• Internal 0.8-ms Voltage Servo Soft-Start with minimum power consumption in the main
• Low-Side R converter. The device employs adaptive on-time D- DS(on) Current Sensing Scheme
CAPTM mode control which enables fast load • Built-In Output Discharge Function transient response without external compensation
• Separate Enable Input for Switchers network. The TPS51285A/B operates with supply
• Dedicated OC Setting Terminals input voltage ranging from 5V to 24V and supports
output voltages of 5 V and 3.3 V. The TPS51285A • Power Good Indicator and TPS51285B are available in a 20-pin 3 x 3 (mm)
• OVP, UVP and OCP Protection QFN package and is specified from -40°C to 85°C.
• Non-Latch UVLO and OTP Protection
• 20-Pin, 3 mm x 3 mm, QFN (RUK)
NEED SOME SPACE
ORDERING INFORMATION(1)
ORDERABLE ALWAYS On-LDO OUTPUT SUPPLY QUANTITY DEVICE NUMBER
TPS51285ARUKR Tape and Reel 3000
VREG3
TPS51285ARUKT Mini reel 250
TPS51285BRUKR Tape and Reel 3000
VREG3 and VREG5
TPS51285BRUKT Mini reel 250
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI
download TPS51285A, TPS51285B.pdf