The TPS51427A TPS51427ARHBT TPS51427ARHBR are dual synchronous step-down controllers designed for laptop and mobile communications applications. This device is part of a low-cost suite of notebook power bus regulators that enables system designs with low external component counts.
The TPS51427A includes two pulse-width-modulation (PWM) controllers, SMPS1 and SMPS2. The output of SMPS1 can be adjusted from 0.7V to 5.9V, while the output of SMPS2 can be adjusted from 0.5V to 2.5V. This device also features a low-dropout (LDO) regulator that provides a 5-V/3.3-V output, or adjustable from 0.7-V to 4.5-V output via LDOREFIN. The fixed-frequency emulated adaptive on-time control supports seamless operation between PWM mode under heavy load conditions and reduced frequency operation at light loads for high-efficiency down to the milliampere range. An integrated boost switch enhances the high-side MOSFET to further improve efficiency. The main control loop is the D-CAP™ mode that is optimized for low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP. Advanced ramp compensation minimizes jitter without degrading line and load regulation. RDS(on) current sensing methods offers maximum cost saving.
The TPS51427A supports supply input voltages that range from 5.5 V to 28 V. It is available in the 32-pin, 5-mm x 5-mm QFN package (Green, RoHs compliant, and Pb-free). The device is specified from –40°C to +85°C.
Features
• Fixed-Frequency Emulated On-Time Control; Frequency Selectable from Three Options
• D-CAP™ Mode Enables Fast Transient Response Less than 100 ns
• Advanced Ramp Compensation Allows Low Output Ripple with Minimal Jitter
• Selectable PWM-Only/OOA™/Auto-Skip Modes
• Wide Input Voltage Range: 5.5 V to 28 V
• Dual Fixed or Adjustable SMPS: – 0.7V to 5.9V (Channel1) – 0.5V to 2.5V (Channel2)
• Fixed 3.3-V/5-V, or Adjustable Output 0.7-V to 4.5-V LDO; Capable of Sourcing 100 mA
• Fixed 3.3-VREF Output Capable of Sourcing 10 mA
• Temperature Compensated Low-Side RDS(on) Current Sensing
• Adaptive Gate Drivers with Integrated Boost Switch
• Bootstrap Charge Auto Refresh
• Integrated Soft Start, Tracking Soft Stop
• Independent PGOOD and EN for Each Channe
• OOB Function Disabled. Refer to TPS51427 fo OOB-Enabled Device
APPLICATIONS
• Notebook I/O and System Bus Rails
• Graphics Application
• PDAs and Mobile Communication Devices
The TPS51427A includes two pulse-width-modulation (PWM) controllers, SMPS1 and SMPS2. The output of SMPS1 can be adjusted from 0.7V to 5.9V, while the output of SMPS2 can be adjusted from 0.5V to 2.5V. This device also features a low-dropout (LDO) regulator that provides a 5-V/3.3-V output, or adjustable from 0.7-V to 4.5-V output via LDOREFIN. The fixed-frequency emulated adaptive on-time control supports seamless operation between PWM mode under heavy load conditions and reduced frequency operation at light loads for high-efficiency down to the milliampere range. An integrated boost switch enhances the high-side MOSFET to further improve efficiency. The main control loop is the D-CAP™ mode that is optimized for low equivalent series resistance (ESR) output capacitors such as POSCAP or SP-CAP. Advanced ramp compensation minimizes jitter without degrading line and load regulation. RDS(on) current sensing methods offers maximum cost saving.
The TPS51427A supports supply input voltages that range from 5.5 V to 28 V. It is available in the 32-pin, 5-mm x 5-mm QFN package (Green, RoHs compliant, and Pb-free). The device is specified from –40°C to +85°C.
Features
• Fixed-Frequency Emulated On-Time Control; Frequency Selectable from Three Options
• D-CAP™ Mode Enables Fast Transient Response Less than 100 ns
• Advanced Ramp Compensation Allows Low Output Ripple with Minimal Jitter
• Selectable PWM-Only/OOA™/Auto-Skip Modes
• Wide Input Voltage Range: 5.5 V to 28 V
• Dual Fixed or Adjustable SMPS: – 0.7V to 5.9V (Channel1) – 0.5V to 2.5V (Channel2)
• Fixed 3.3-V/5-V, or Adjustable Output 0.7-V to 4.5-V LDO; Capable of Sourcing 100 mA
• Fixed 3.3-VREF Output Capable of Sourcing 10 mA
• Temperature Compensated Low-Side RDS(on) Current Sensing
• Adaptive Gate Drivers with Integrated Boost Switch
• Bootstrap Charge Auto Refresh
• Integrated Soft Start, Tracking Soft Stop
• Independent PGOOD and EN for Each Channe
• OOB Function Disabled. Refer to TPS51427 fo OOB-Enabled Device
APPLICATIONS
• Notebook I/O and System Bus Rails
• Graphics Application
• PDAs and Mobile Communication Devices