TPS51275B-1 Datasheet | Texas Instruments

atures - 1 Input Voltage Range: 5 V to 24 V - Output Voltages: 5 V and 3.3 V (Adjustable Range ±10%) - Built-in, 100-m A, 5-V, and 3.3-V LDOs - Clock Output for Charge-Pump - ±1% Reference Accuracy - Adaptive On-Time D-CAP™ Mode Control Architecture with 300-k Hz and 355-k Hz Frequency Setting - Out-of-Audio™ (OOA) Light-Load Operation - Internal 3.2-ms Voltage Servo Soft-Start - Low-Side RDS(on) Current Sensing Scheme - Built-In Output Discharge Function - Separate Enable Input for Switchers - Dedicated OC Setting Terminals - Power Good Indicator - OVP, UVP, and OCP Protection - Non-Latch UVLO and OTP Protection - 20-Pin, 3-mm × 3-mm, WQFN (RUK) Package 2 Applications - Notebook puters - Tablet puters - Desktop puters 3 Description The TPS51275B-1 device is a cost-effective, dualsynchronous buck controller targeted for notebook system-power supply solutions. The device has 5-V and 3.3-V low-dropout regulators (LDOs) and requires few external ponents. The 260-k Hz VCLK output can be used to drive an external charge pump, generating gate drive voltage for the load switches without reducing the main converter efficiency. The TPS51275B-1 device supports high efficiency, fast transient response and provides a bined power-good signal. Adaptive on-time, DCAP control provides convenient and efficient operation. The device operates with a supply input voltage ranging from 5 to 24 V and supports output voltages of 5 V and 3.3 V. The TPS51275B-1 device is available in a 20-pin, 3-mm × 3-mm, WQFN package and is specified from - 40°C to 85°C. Device Information(1) PART NUMBER SKIP MODE ALWAYS ON-LDO VREG3 and VREG5 (1) For all available packages, see the orderable addendum at the end of the datasheet. 4 Typical Application Diagram VOUT 5V VBST1 VBST2 DRVH1 DRVH2 SW1 SW2...