Controller

BQ24728 Datasheet – Battery SMBus Charge Controller – TI

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Part Number: BQ24728, BQ728, BQ24728RGRT

Function: Battery SMBus Charge Controller ( Power management , System Charge Power IC )

Package: QFN 20 Pin

Manfacturers: Texas Instruments

Image:

BQ24728 image

Description

The bq24728 is a high-efficiency, synchronous battery charger, offering low component count for space-constraint, multi-chemistry battery charging applications. The device uses two charge pumps to  separately drive n-channel MOSFETs (ACFET, RBFET and BATFET) for automatic system power source selection. SMBus controlled input current, charge current, and charge voltage DACs allow for high regulation accuracies that can be programmed by the system power management micro-controller.

Features

  • SMBus programmable charging parameters (voltage/current/input limit)
  • High-efficiency synchronous charging architecture
  • Automatic power source selection (adapter ↔ battery)
  • Supports multi-chemistry battery systems (primarily Li-ion/Li-polymer)
  • Low external component count
  • High regulation accuracy via internal DACs
  • Dual charge pump for full NMOS drive (no P-channel needed)

Pinout

BQ24728 Datasheet, Pinout

Typical Circuit Usage

  • Adapter input → ACFET/RBFET → system rail
  • Synchronous buck stage → battery charging path
  • BATFET controls battery connection/disconnection
  • SMBus connected to EC (Embedded Controller)

Design Notes (Critical Points)

  • Accurate current sensing resistor selection is essential for charge precision
  • External MOSFET selection impacts efficiency and thermal performance
  • SMBus firmware must properly configure charging profiles
  • PCB layout must minimize switching loop inductance
  • Thermal design critical for high-current charging scenarios

Applications

  • Notebook / ultrabook / netbook platforms
  • Handheld and portable terminals
  • Industrial battery-powered equipment
  • Medical portable systems
  • Embedded battery charging modules

Advantages

  • Highly flexible and programmable
  • Efficient power-path control
  • Reduced component count
  • Suitable for smart battery systems

Alternative / Equivalent Products

  • BQ24727 (closely related variant)
  • BQ24725A
  • ISL6255
  • MAX8734
  • LTC4012

BQ24728 Datasheet

BQ24728 pdf

BQ24725 Datasheet

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uP9512R Datasheet – PWM Controller

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Part Number: uP9512R

Function: Phase Synchronous-Rectified Buck Controller

Package: VQFN5x5-40L package

Manufacturer: uPI Semiconductor( www.upi-semi.com )

Image

uP9512R datasheet controller

Description

The uP9512R is an 8/7/6/5/4/3/2/1-phase PWM controller specifically designed to provide high-precision output voltage system for next generation GPUs. The uP9512R provides programmable output voltage and active voltage positioning functions to adjust the output voltage as a function of the load current, so it is optimally positioned for  a load current transient.

Features

1. Support up to 2MHz Operation Frequency

2. Continuous Inductor DCR Current Sensing

3. Auto-Phase Shedding

4. Adjustable Soft-Start Time

5. Power State Input (PSI)

6. Power Good Indication

7. Channel Current Limit Protection

8. Total Output Over Current Protection

9.  Over/Under Voltage Protection

10. Over Temperature Protection

 

Pinout

uP9512R pinout pwm

 

Applications

1. Desktop/Server CPU Power Supply (Core VRM)

(1) uP9512R is suitable for CPU core power supply of Intel and AMD platforms.

(2) As a multi-phase synchronous buck controller for multi-core CPUs requiring high current and fast response, current distribution and efficient power supply are possible

(3) Example: High-end CPU power supply such as Intel LGA1700, LGA1200, AMD AM5, TR4

2. GPU power supply (Vcore and Memory Power)

(1) Can be used as Vcore and GDDR memory power supply of NVIDIA and AMD GPUs

(2) Especially adopted in many Power Delivery designs of board partner (AIB) graphics cards

(3) High switching frequency, fast DVID response performance is required

3. FPGA / ASIC / AI Accelerator board power supply

(1) Used as power supply of Xilinx, Intel FPGA, or AI computing SoC (e.g. Google TPU, NVIDIA Grace, etc.)

(2) Suitable for applications where load transient characteristics are important

4. Mainboard power supply for server / data center

(1) Adjust multiple power rails such as CPU, VCCIN, VDDR on server class mainboards

(2) Supports VR13 (Intel), SVID interface → Used as a server controller

(3) High-end motherboard CPU VCore ( ASUS ROG, MSI, GIGABYTE, NVIDIA RTX graphics card )

uP9512R Datasheet

uP9512R pdf