TPS51120

Name: TPS51120
Brand: TI
SKU: TPS51120
Price: 1.477 USD

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4.5-V to 28-V, dual-channel synchronous buck controller with low standby current consumption

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Data sheet

document-pdfAcrobat TPS51120 Dual, Synchronous Step-Down Controller With 100-mA Standby Regulators for Notebook System Power datasheet (Rev. C) PDF | HTML

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TPS51120

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Data sheet

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Product details

Vin (min) (V)

4.5

Vin (max) (V)

28

Iout (max) (A)

20

Operating temperature range (°C)

-40 to 85

Control mode

D-CAP, current mode

Topology

Buck

Rating

Catalog

Vout (min) (V)

1

Vout (max) (V)

5.5

Features

Enable, Light Load Efficiency, Power good, Synchronous Rectification

Iq (typ) (µA)

750

Duty cycle (max) (%)

88

Number of phases

1

Vin (min) (V)

4.5

Vin (max) (V)

28

Iout (max) (A)

20

Operating temperature range (°C)

-40 to 85

Control mode

D-CAP, current mode

Topology

Buck

Rating

Catalog

Vout (min) (V)

1

Vout (max) (V)

5.5

Features

Enable, Light Load Efficiency, Power good, Synchronous Rectification

Iq (typ) (µA)

750

Duty cycle (max) (%)

88

Number of phases

1

VQFN (RHB)

32

25 mm² 5 x 5

3.3-V and 5-V 100-mA Bootstrapped Standby
Regulators with Independent Enables
Selectable D-CAP™ Mode Enables Fast Transient
Response Less than 100 ns
Selectable Low Ripple Current Mode
Less than 1% Internal Reference Accuracy
Selectable PWM-only/Auto-skip Modes
Low-side R_DS(on) Loss-less Current Sensing
R_SENSE Accurate Current Sense Option
Internal Soft-Start and Integrated V_OUT Discharge
Transistors
Integrated 2-V Reference
Adaptive Gate Drivers with Integrated Boost Diode
Powergood for Each Channel with Delay Timer
Fault Disable Mode
Supply Input Voltage Range: 4.5 V to 28 V

3.3-V and 5-V 100-mA Bootstrapped Standby
Regulators with Independent Enables
Selectable D-CAP™ Mode Enables Fast Transient
Response Less than 100 ns
Selectable Low Ripple Current Mode
Less than 1% Internal Reference Accuracy
Selectable PWM-only/Auto-skip Modes
Low-side R_DS(on) Loss-less Current Sensing
R_SENSE Accurate Current Sense Option
Internal Soft-Start and Integrated V_OUT Discharge
Transistors
Integrated 2-V Reference
Adaptive Gate Drivers with Integrated Boost Diode
Powergood for Each Channel with Delay Timer
Fault Disable Mode
Supply Input Voltage Range: 4.5 V to 28 V

The TPS51120 is a highly sophisticated dual, synchronous step-down controller. It is a full featured controller designed to run directly off a three- or four-cell Li-ion battery and provide high-power and 5-V and/or 3.3-V standby regulation for all the downstream circuitry in a notebook computer system. High-current, 100-mA, 5-V or 3.3-V on-board linear regulators have glitch-free switch over function to SMPS and can be kept alive independently during standby state. The pseudo-constant frequency adaptive on-time control scheme supports full range of current mode operation including simplified loop compensation, ceramic output capacitors as well as seamless transition to reduced frequency operation at light-load condition. Optional D-CAP mode operation optimized for SP-CAP or POSCAP output capacitors allows further reduction of external compensation parts. Dynamic UVP supports VIN line sag without latch off by hitting 5-V UVP. No negative voltage appears at output voltage node during UVLO, UVP, and OCP, OTP or loss of VIN.

The TPS51120 32-pin QFN package is specified from –40°C to 85°C ambient temperature.

The TPS51120 is a highly sophisticated dual, synchronous step-down controller. It is a full featured controller designed to run directly off a three- or four-cell Li-ion battery and provide high-power and 5-V and/or 3.3-V standby regulation for all the downstream circuitry in a notebook computer system. High-current, 100-mA, 5-V or 3.3-V on-board linear regulators have glitch-free switch over function to SMPS and can be kept alive independently during standby state. The pseudo-constant frequency adaptive on-time control scheme supports full range of current mode operation including simplified loop compensation, ceramic output capacitors as well as seamless transition to reduced frequency operation at light-load condition. Optional D-CAP mode operation optimized for SP-CAP or POSCAP output capacitors allows further reduction of external compensation parts. Dynamic UVP supports VIN line sag without latch off by hitting 5-V UVP. No negative voltage appears at output voltage node during UVLO, UVP, and OCP, OTP or loss of VIN.

The TPS51120 32-pin QFN package is specified from –40°C to 85°C ambient temperature.

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	Type	Title		Date
*	Data sheet	TPS51120 Dual, Synchronous Step-Down Controller With 100-mA Standby Regulators for Notebook System Power datasheet (Rev. C)	PDF \| HTML	29 Jan 2015
	User guide	TPS51120 Buck Controller Evaluation Module User's Guide (Rev. B)	PDF \| HTML	04 Mar 2022

Design & development

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Evaluation board

TPS51120EVM-001 — TPS51120 Evaluation Module

The TPS51120EVM-001 evaluation module utilizes the TPS51120 in a high efficiency, dual synchronous buck converter providing 5 V at 6 A and 3.3 V at 6 A from 8 V to 25 V input. The user’s guide describes the TPS51120EVM-001 performance in D-CAP™ mode and RDS(on) current sensing.

The TPS51120 is a (...)

User guide: PDF | HTML