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TPS51125-TPS51125RGER-TPS51125RGET-TPS51125RGETG4
Dual-Synchronous, Step-Down Controller with Out-of-AudioT Operation and 100-mA LDOs
VO1
PGOOD
VBST1
DRVH1
VO2
VREG3
VBST2
DRVH2
TPS51125RGE
LL1
DRVL1
LL2
DRVL21718
KIP
GNDV
REG5
CLK54321
NTRIP2
ONSE
REF
NTRIP1
PowerPAD
220nFkW 20kW 30kW
100kW
VREG5
5.1W
0.1Fm
130kW130kW
3.3Hm
330Fm
VO1V
VIN
VINFx2m
VIN
5.5VV
5.1W
0.1Fm
3.3Hm
VO2Fx2mFmkW
VINV100nF
620kW
VO1VREF
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TPS51125SLUS786H –OCTOBER 2007–REVISED JANUARY 2015
TPS51125 Dual-Synchronous, Step-Down Controller With Out-of-Audio™ Operation and
100-mA LDOS for Notebook System Power Features 3 DescriptionThe TPS51125isa cost-effective, dual-synchronous Wide Input Voltage Range: 5.5Vto 28V buck controller targeted for notebook system power• Output Voltage Range:2Vto 5.5V supply solutions. The device provides 5-V and 3.3-V• Built-In 100-mA, 5-V and 3.3-V LDO With LDOs and requires few external components. The
Switches 270-kHz VCLK output can be used to drive an
external charge pump, thus generating gate drive• Built-In 1% 2-V Reference Output voltage for the load switches without reducing the• Withor Without Out-of-Audio™ Mode Selectable efficiency of the main converter. The TPS51125Light-Load and PWM-Only Operation supports high-efficiency, fast-transient response and Internal 1.6-ms Voltage Servo Soft-Start providesa combined power-good signal. Out-of-
Audio mode light-load operation enables low acoustic• Adaptive On-Time Control Architecture With Four noise at much higher efficiency than conventionalSelectable Frequency Setting forced PWM operation. Adaptive on-time D-CAP™• 4500 ppm/°C RDS(on) Current Sensing control provides convenient and efficient operation. Built-In Output Discharge The part operates with supply input voltages ranging
from 5.5Vto 28V and supports output voltages from• Powergood Output 2Vto 5.5V. The TPS51125is availableina 24-pin• Built-In OVP/UVP/OCP QFN package andis specified from -40°Cto 85°C• Thermal Shutdown (Nonlatch) ambient temperature range. QFN, 24-Pin (RGE)
Device Information(1)2 Applications• Notebook Computers
(1) Forall available packages, see the orderable addendumat• I/O Supplies the endofthe datasheet.• System Power Supplies
Simplified Schematic
