LM7480 datasheet(20/44 Pages) TI

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10 Applications and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

10.1 Application Information

LM7480 controls two N-channel power MOSFETs with DGATE used to control diode MOSFET to emulate

an ideal diode and HGATE controlling second MOSFET for power path cut-off when disabled or during an

overvoltage protection. HGATE controlled MOSFET can be used to clamp the output during overvoltage or load

dump conditions. LM7480 can be placed into low quiescent current mode using EN/UVLO, where both DGATE

and HGATE are turned OFF.

The device has a separate supply input pin (Vs). The charge pump is derived from this supply input. With the

separate supply input provision and separate GATE control architecture, the LM7480 device offers flexibility in

system design architectures and enables circuit design with various power path control topologies like common

drain, common source, ORing and Power MUXing. With these various topologies, the system designers can

design the front-end power system to meet various system design requirements. For more information, see the

Six System Architectures With Robust Reverse Battery Protection Using an Ideal Diode Controller Application

Report.

10.2 Typical 12-V Reverse Battery Protection Application

A typical application circuit of LM74800 configured in common-drain topology to provide reverse battery

protection with overvoltage protection is shown in Figure 10-1.

GND

DGATE

HGATE

OUT

EN/UVLO

VOUT1

LM74800

CAP

ON OFF

VSNS

BATT_MON

CIN

CLOAD

CVS

CCAP

SMBJ33CA

47 µF

0.1µF

CdVdT

VBATT

90.9k

9.09k

3.48k

100

10nF

VOUT2 (ALWAYS ON)

Figure 10-1. Typical Application Circuit – 12-V Reverse Battery Protection and Overvoltage Protection

10.2.1 Design Requirements for 12-V Battery Protection

The system design requirements are listed in Table 10-1.

Table 10-1. Design Parameters - 12-V Reverse Battery Protection and Overvoltage Protection

DESIGN PARAMETER

EXAMPLE VALUE

Operating Input Voltage Range

12-V battery, 12-V nominal with 3.2-V Cold Crank and 35-V Load

Dump

Output Power

50 W

Output Current Range

4-A Nominal, 5-A maximum

Input Capacitance

0.1-µF minimum

LM7480

SNOSDD8 – DECEMBER 2022

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