Product Summary

The TPS51125 is a cost effective, dual-synchronous buck controller targeted for notebook system power supply solutions. The TPS51125 provides 5-V and 3.3-V LDOs and requires few external components. The 270-kHz VCLK output can be used to drive an external charge pump, generating gate drive voltage for the load switches without reducing the main efficiency. The TPS51125 supports high efficiency, fast transient response and provides a combined power-good signal. Out-of-Audio mode light-load operation enables low acoustic noise at much higher efficiency than conventional forced PWM operation. The TPS51125 operates with supply input voltages ranging from 5.5 V to 28 V and supports output voltages from 2 V to 5.5 V. The TPS51125 is available in a 24-pin QFN package.

Parametrics

TPS51125 absolute maximum ratings: (1)Input voltage range, VBST1, VBST2: -0.3 to 36V; VIN: -0.3 to 30V; LL1, LL2: -2.0 to 30V; VBST1, VBST2: -0.3 to 6V; EN0, ENTRIP1, ENTRIP2, VFB1, VFB2, VO1, VO2, TONSEL, SKIPSEL: -0.3 to 6V; (2)Output voltage range, DRVH1, DRVH2: -1.0 to 36V; DRVH1, DRVH2: -0.3 to 6V; PGOOD, VCLK, VREG3, VREG5, VREF, DRVL1, DRVL2: -0.3 to 6V; (3)TJ, Junction temperature range: -40 to 125℃; (4)Tstg, Storage temperature: -55 to 150℃.

Features

TPS51125 features: (1)Wide Input Voltage Range: 5.5 V to 28V; (2)Output Voltage Range: 2 V to 5.5 V; (3)Built-in 100-mA 5-V/3.3-V LDO with Switches; (4)Built-in 1% 2-V Reference Output; (5)With/Without Out-of-Audio Mode Selectable Light Load and PWM only Operation; (6) Internal 1.6-ms Voltage Servo Softstart; (7)Adaptive On-Time Control Architecture with Four Selectable Frequency Setting; (8)4500 ppm/ ℃ R DS(on) Current Sensing; (9)Built-In Output Discharge; (10)Power Good Output; (11)Built-in OVP/UVP/OCP; (12)Thermal Shutdown (Non-latch); (13)QFN24 (RGE).

Diagrams

TPS51125 typical application diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
TPS51125
TPS51125

Other


Data Sheet

Negotiable 
TPS51125AEVM
TPS51125AEVM

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Data Sheet

0-1: $33.17
TPS51125ARGER
TPS51125ARGER

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Data Sheet

0-2350: $1.49
2350-3000: $1.48
TPS51125ARGET
TPS51125ARGET

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Data Sheet

0-135: $2.50
135-250: $2.30
250-500: $2.09
500-1000: $1.75
TPS51125EVM
TPS51125EVM

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Data Sheet

0-1: $33.17
TPS51125RGER
TPS51125RGER

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Data Sheet

0-1: $2.92
1-25: $2.34
25-100: $1.87
100-250: $1.55
TPS51125RGERG4
TPS51125RGERG4

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Data Sheet

0-2350: $1.49
2350-3000: $1.48
TPS51125RGET
TPS51125RGET

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DC/DC Switching Controllers Dual-Synch Step- Down Controller

Data Sheet

0-1: $3.28
1-25: $2.77
25-100: $2.50
100-250: $2.30