illustrate

The TPS51427A is a dual synchronous buck controller designed for notebook and mobile communication applications. This device is part of a notebook power bus regulation low-cost kit that enables low external component count. The TPS51427A includes two pulse-width modulation (PWM) controllers, SMPS1 and SMPS2. The SMPS1 output can be adjusted from 0.7 V to 5.9 V, while the SMPS2 output can be adjusted from 0.5 V to 2.5 V, and the device also features a low dropout (LDO) regulator that provides a 5-V/3.3-V output, or an adjustable output from 0.7 V to 4.5 V via LDOREFIN. Fixed frequency analog adaptive turn-on time control reduces operating frequency under high load conditions that support seamless operation between high efficiency drops to light-load mA range PWM modes.

characteristic

• Analog on-time control of fixed frequency with three options to choose from
• D - The ™ mode achieves a fast transient response of less than 100 ns
• Advanced slope compensation allows low output ripple with minimal jitter
• Optional PWM-Only/OOA™/Auto Skip Mode
• Wide input voltage range: 5.5 V to 28 V
• Dual fixed or adjustable switching power supplies:
  • 0.7 V to 5.9 V (Channel 1)
  • 0.5 V to 2.5 V (Channel 2)
• Fixed 3.3-V/5-V, or adjustable output 0.7 V to 4.5-V LDO, capable of purchasing 100 mA
• Fixed 3.3 - VREF output 10 mAh purchase capable
• Temperature compensated low-side_targetR_DS（ON）Current sensing
• Adaptive gate driver with integrated boost switch
• Bootstrap charging refreshes automatically
• Built-in soft start, soft stop tracking
• Independent PGOOD and each channel EN
• Out-of-band features are prohibited. TPS51427 OOB-capable device with reference
• apply
  • Laptop I/O and system bus Rails
  • Graphics applications
  • PDA and mobile communication equipment