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See Technical Specifications

TPS51120RHBT +BOM

Buck Regulator Positive Output Step-Down DC-DC Controller IC 32-VQFN (5x5)

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

TPS51120RHBT
Datasheet:

TPS51120RHBT Datasheet (PDF)
Vin (min) (V):

4.5
Vin (max) (V):

28
Vout (min) (V):

1
Vout (max) (V):

5.5
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TPS51120RHBT General Description

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.

Key Features

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

Specifications

Vin (min) (V)	4.5	Vin (max) (V)	28
Vout (min) (V)	1	Vout (max) (V)	5.5
Iout (max) (A)	20	Iq (typ) (mA)	0.75
Switching frequency (min) (kHz)	180	Switching frequency (max) (kHz)	500
Features	Enable, Light Load Efficiency, Power good, Synchronous Rectification	Operating temperature range (°C)	-40 to 85
Regulated outputs (#)	2	Number of phases	1
Rating	Catalog	Control mode	D-CAP, current mode
Type	Controller	Pin Count	33
Released Date	Aug 8, 2019	Last Modified Date	Mar 7, 2023 4:10 PM UTC