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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

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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

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

BQ24725 Datasheet

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This ic is Inverter TTL.

Part Number: 7404, SN7404, SN74LS04

Function: HEX INVERTER

Package: DIP 14 Pin

Manufacturer: Texas Instruments

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Description

These devices contain six independent inverters.

It consists of six inverters which perform logical invert action. The output of an inverter is the complement of its input logic state, i.e., when input is high its output is low and vice versa.

1. TTL (Transistor-Transistor Logic): TTL is a type of digital logic family used in electronic circuits. It uses transistors to perform logical operations and is known for its high-speed switching capabilities and relatively simple design. TTL logic gates include basic components such as NAND gates, NOR gates, AND gates, OR gates, and inverters. These gates can be combined to create more complex digital circuits.

2. Hex Inverter: A “Hex Inverter” typically refers to an integrated circuit (IC) that contains six individual inverter gates. An inverter, as the name suggests, inverts the input signal. If the input is high, the output is low, and if the input is low, the output is high. The hex inverter IC is often labeled as “74xx04” or similar, where “74” is the series of TTL logic and “04” specifies the hex inverter.

Dependable Texas Instruments Quality and Reliability

Pinout

Operating Condition :

1. The power supply should be given to the IC from 4.5V DC to 5.25V DC

2. The IC will consider a signal as high when the voltage of the signal is above 2V

3. The IC will consider a signal as low when the voltage of the signal is below 0.8V

4. The operating temperature of the IC should be below the 70-degree centigrade

Characteristics:

1. IC 7404 can deliver -0.4 mA current when the output is high.

2. It can deliver 16 mA current when the output is low.

3. When the Vcc is 5V and the input signal is 5V then the IC draws 1 mA current.

4. When the Vcc is 5V and the input signal is 2.7V then the IC draws 20 to 40 micro-ampere currents.

5. When the Vcc is 5V and the input signal is 0.4V then the IC draws -1.6 mA current.

Ordering Information

7404 Datasheet PDF

Posts related to ‘ Hex Inverter ‘

Part number	Description
MM74HC04N	Hex Inverter
MC74AC05	Hex Inverter
74HC04-Q100	Hex Inverter – NXP
74LS14	Hex Inverter with Schmitt Trigger
74ACT04SC	Hex Inverter
SN74LS06NSR	Hex Inverter Buffer and Driver
7416	Hex Inverter Buffer / Driver, SN7416
74LS04	HEX INVERTER – Motorola
7404	Hex Inverter – SN7404D
SN74LS04	HEX INVERTER – TI