Home Power management DC/DC switching regulators DC/DC controllers
Home
Power management
DC/DC switching regulators
DC/DC controllers

TPS51285A

ACTIVE

5-V to 24-V, dual-synchronous buck controller with 3.2 ms soft start

Order now
Data sheet

TPS51285A

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck Iout (max) (A) 20 Vin (max) (V) 24 Vin (min) (V) 5 Vout (max) (V) 5.5 Vout (min) (V) 4.5 Control mode D-CAP Features Enable, Light-load efficiency, Power good, Synchronous rectification Duty cycle (max) (%) 100 Iq (typ) (A) 0.000084 Number of phases 1 Operating temperature range (°C) -40 to 85
Rating Catalog Topology Buck Iout (max) (A) 20 Vin (max) (V) 24 Vin (min) (V) 5 Vout (max) (V) 5.5 Vout (min) (V) 4.5 Control mode D-CAP Features Enable, Light-load efficiency, Power good, Synchronous rectification Duty cycle (max) (%) 100 Iq (typ) (A) 0.000084 Number of phases 1 Operating temperature range (°C) -40 to 85
WQFN (RUK) 20 9 mm² (3 mm × 3 mm)
  • Input Voltage Range: 5 V to 24 V
  • Output Voltages: 5 V and 3.3 V
    (Adjustable Range ±10%)
  • Built-in, 100-mA, 5-V and 3.3-V
    LDOs
  • Clock Output for Charge-Pump
  • ±1% Reference Accuracy
  • Adaptive On-Time D-CAP Mode Control
    Architecture with 400 kHz (CH1) and
    475 kHz (CH2) Frequency
  • Auto-skip and ULQ modes for long
    battery life in system stand-by mode
  • Internal 0.8-ms Voltage Servo Soft-Start
  • Low-Side RDS(on) Current Sensing Scheme
  • Built-In Output Discharge Function
  • Separate Enable Input for Switchers
  • Dedicated OC Setting Terminals
  • Power Good Indicator
  • OVP, UVP and OCP Protection
  • Non-Latch UVLO and OTP Protection
  • 20-Pin, 3 mm × 3 mm, QFN (RUK)
  • Input Voltage Range: 5 V to 24 V
  • Output Voltages: 5 V and 3.3 V
    (Adjustable Range ±10%)
  • Built-in, 100-mA, 5-V and 3.3-V
    LDOs
  • Clock Output for Charge-Pump
  • ±1% Reference Accuracy
  • Adaptive On-Time D-CAP Mode Control
    Architecture with 400 kHz (CH1) and
    475 kHz (CH2) Frequency
  • Auto-skip and ULQ modes for long
    battery life in system stand-by mode
  • Internal 0.8-ms Voltage Servo Soft-Start
  • Low-Side RDS(on) Current Sensing Scheme
  • Built-In Output Discharge Function
  • Separate Enable Input for Switchers
  • Dedicated OC Setting Terminals
  • Power Good Indicator
  • OVP, UVP and OCP Protection
  • Non-Latch UVLO and OTP Protection
  • 20-Pin, 3 mm × 3 mm, QFN (RUK)

The TPS51285A and TPS51285B are cost-effective, dual synchronous buck controllers with 5-V and 3.3-V LDOs, targeted for notebook system-power supply solutions. The device achieves low power consumption by the use of auto-skip and ULQ™ modes, which is beneficial for long battery life in system stand-by mode. The 256-kHz VCLK output is provided to drive an external charge pump, generating gate drive voltage for the load switches with minimum power consumption in the main converter. The device employs adaptive on-time D-CAP™ mode control which enables fast load transient response without external compensation network. The TPS51285A/B operates with supply input voltage ranging from 5V to 24V and supports output voltages of 5 V and 3.3 V. The TPS51285A and TPS51285B are available in a 20-pin 3 x 3 (mm) QFN package and is specified from –40°C to 85°C.

The TPS51285A and TPS51285B are cost-effective, dual synchronous buck controllers with 5-V and 3.3-V LDOs, targeted for notebook system-power supply solutions. The device achieves low power consumption by the use of auto-skip and ULQ™ modes, which is beneficial for long battery life in system stand-by mode. The 256-kHz VCLK output is provided to drive an external charge pump, generating gate drive voltage for the load switches with minimum power consumption in the main converter. The device employs adaptive on-time D-CAP™ mode control which enables fast load transient response without external compensation network. The TPS51285A/B operates with supply input voltage ranging from 5V to 24V and supports output voltages of 5 V and 3.3 V. The TPS51285A and TPS51285B are available in a 20-pin 3 x 3 (mm) QFN package and is specified from –40°C to 85°C.
filter Find other DC/DC controllers
Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Drop-in replacement with upgraded functionality to the compared device.
TPS51285B ACTIVE 5-V to 24-V, dual-synchronous buck controller with ultra-low quiescent current Offers upgraded ultra-low quiescent current.
Pin-for-pin with same functionality to the compared device.
TPS51275C ACTIVE 5.5-V to 24-V, dual-synchronous buck controller with VREG5 always-on LDO Wider operating temperature range with additional outputs.

Technical documentation

No results found. Please clear your search and try again.
View all 3
Top documentation Type Title Format options Date
* Data sheet Ultra-Low Quiescent (ULQ) Dual Synchronous Step-Down Controller with 5V/ 3.3V datasheet Apr 12, 2013
Application note Non-Isolated Point-of-Load Solutions for Tiger Lake in PC Applications (Rev. B) PDF | HTML Apr 29, 2021
Application note Non-Isolated Point-of-Load Solutions for Elkhart Lake in Industrial PC App. (Rev. A) PDF | HTML May 21, 2020

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

TPS51285A Unencrypted PSpice Transient Model Package (Rev. A)

SLVM845A.ZIP (87 KB) - PSpice model
Supported products & hardware
Reference design

TIPA-050005 — Non-isolated point-of-load solutions for Tiger Lake in PC applications

Advanced processors and platforms such as the Intel® Tiger Lake micro-architecture need point-of-load (POL) solutions for memory, low-power CPU rails, and 3.3V and 5V rail requirements from an array of rechargeable batteries, or a 12V input bus. 

 

This power-supply design highlights the latest (...)

Supported products & hardware
Reference design

TIPA-050016 — Non-isolated point-of-load solutions for Elkhart Lake in industrial PC applications

Advanced processors and platforms, such as the Intel® Elkhart Lake micro-architecture, need point-of-load (POL) solutions for memory, low-power CPU rails, and 3.3V and 5V rail requirements from an array of rechargeable batteries or a 12V input bus.

This power-supply design highlights the latest (...)

Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
WQFN (RUK) 20 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos