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Partno	Mfg	Dc	Qty	Available	Descript
TPS51427A	TI	N/a	36	avai	Dual D-CAP?Mode Synchronous Step Down Controller for Notebook Power with OOB Function Disabled 32-VQFN -40 to 85
TPS51427ARHBR	TI	N/a	3000	avai	Dual D-CAP?Mode Synchronous Step Down Controller for Notebook Power with OOB Function Disabled 32-VQFN -40 to 85
TPS51427ARHBT	TI	N/a	180	avai	Dual D-CAP?Mode Synchronous Step Down Controller for Notebook Power with OOB Function Disabled 32-VQFN -40 to 85

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TPS51427ARHBT ,Dual D-CAP?Mode Synchronous Step Down Controller for Notebook Power with OOB Function Disabled 32-VQFN -40 to 85FEATURES DESCRIPTION23• Fixed-Frequency Emulated On-Time Control;The TPS51427A is a dual synchronou ..
TPS51427RHBR ,Dual D-CAP?Mode Synchronous Step Down Controller for Notebook Power Rails 32-VQFN -40 to 85maximum ratings may cause permanent damage to the device. These are stress ratingsonly, and functio ..
TPS51427RHBT ,Dual D-CAP?Mode Synchronous Step Down Controller for Notebook Power Rails 32-VQFN -40 to 85FEATURESDESCRIPTION23• Fixed-Frequency Emulated On-Time Control;Frequency Selectable from Three Opt ..
TPS51461RGER ,3.3V to 5V Input, 6A, D-CAP+ Mode Synchronous Step-Down Converter with 2-Bit VID 24-VQFN -40 to 85features two switching frequency• Auto Skip Modesettings (700 kHz and 1 MHz), skip mode, pre-bias• ..
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TPS51427A-TPS51427ARHBR-TPS51427ARHBT
Dual D-CAP?Mode Synchronous Step Down Controller for Notebook Power with OOB Function Disabled 32-VQFN -40 to 85
1FEATURES DESCRIPTION
APPLICATIONS
TPS51427A
www.ti.com.................................................................................................................................................. SLUS843B–MAY 2008–REVISED SEPTEMBER 2008
DUAL D-CAP™ SYNCHRONOUS STEP-DOWN CONTROLLER
FOR NOTEBOOK POWER RAILS
23• Fixed-Frequency Emulated On-Time Control; The TPS51427Aisa dual synchronous step-downFrequency Selectable from Three Options controller designed for notebook and mobile
communications applications. This deviceis partofa• D-CAP™ Mode Enables Fast Transient low-cost suiteof notebook power bus regulators thatResponse Less than 100ns enables system designs with low external component• Advanced Ramp Compensation Allows Low counts. The TPS51427A includes twoOutput Ripple with Minimal Jitter pulse-width-modulation (PWM) controllers, SMPS1• Selectable PWM-Only/OOA™/Auto-Skip Modes and SMPS2. The outputof SMPS1 can be adjusted
from 0.7Vto 5.9V, while the outputof SMPS2 can• Wide Input Voltage Range: 5.5Vto28V be adjusted from 0.5Vto 2.5V. This device also• Dual Fixedor Adjustable SMPS: featuresa low-dropout (LDO) regulator that provides 0.7Vto 5.9V (Channel1) a 5-V/3.3-V output,or adjustable from 0.7-Vto 4.5-V
output via LDOREFIN. The fixed-frequency emulated– 0.5Vto 2.5V (Channel2) adaptive on-time control supports seamless operation• Fixed 3.3-V/5-V,or Adjustable Output 0.7-Vto between PWM mode under heavy load conditions4.5-V LDO; Capableof Sourcing 100 mA and reduced frequency operationat light loads for• Fixed 3.3-VREF Output Capableof Sourcing high-efficiency downto the milliampere range. An mA integrated boost switch enhances the high-side
MOSFET to further improve efficiency. The main• Temperature Compensated Low-Side RDS(on) control loopis the D-CAP™ mode thatis optimizedCurrent Sensing for low equivalent series resistance (ESR) output• Adaptive Gate Drivers with Integrated Boost capacitors such as POSCAPor SP-CAP. AdvancedSwitch ramp compensation minimizes jitter without degrading
line and load regulation. RDS(on) current sensing• Bootstrap Charge Auto Refresh
methods offers maximum cost saving.• Integrated Soft Start, Tracking Soft Stop
The TPS51427A supports supply input voltages that• Independent PGOOD and EN for Each Channel range from 5.5Vto 28V.Itis availablein the 32-pin,• OOB Function Disabled. Referto TPS51427 for 5-mm × 5-mm QFN package (Green, RoHs-OOB-Enabled Device compliant, and Pb-free). The deviceis specified from
–40°Cto +85°C. Notebook I/O and System Bus Rails Graphics Application PDAs and Mobile Communication Devices