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LM5177 Datasheet(PDF) 32 Page - Texas Instruments

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Part # LM5177
Description  LM251772 36V 4-Switch Buck-Boost Controller with I2C for USB-PD sourcing
PDF  112 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM5177 Datasheet(HTML) 32 Page - Texas Instruments

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8.3.6 Internal VCC Regulators
8.3.6.1 VCC1 Regulator
The LM51772 features a VCC1 regulator which provides an LDO output for auxiliary use in the system. VCC1
gets directly supplied by VIN pin. In most applications the output is used to supply the I2C controller device
which sends data to the LM51772. You can find a drawing for this application below.
PD Controller
VIN
Supply
Supervisor
EN
nRST
SUPPLY
VCC1
GPIOx
SDA
SCL
nFLT
nIRQ
Figure 8-14. Simplified Schematic
To ensure the power sequence of such a system can be met the VCC1 starts-up when the device is entering the
standby mode. See a typical power up sequence below.
OFF
nRST
Standby
VCC1
EN/UVLO
ACTIVE
VCC2
VT+(UVLO,VCC2)
VT-(UVLO,VCC2)
OFF
td(VCC1)
Figure 8-15. Timing Diagram VCC Regulator
The VCC1 regulator provides high DC accuracy at light load condition to support a use as a reference voltage for
external circuits e.g. a comparator or operational amplifier.
The VCC1 is enabled/disabled via R2D or the I2C interface . Therefore the start-up of VCC1 is gated by the R2D
readout.
8.3.6.2 VCC2 Regulator
The VCC2 regulator is the supply for the integrated gate driver. The LDO starts in low-current, pre-bias mode,
once the voltage on the nRST-Pin is higher that its rising threshold. If the EN/UVLO pin is higher that its rising
threshold the VCC2 is fully active and provides the target performance specified by the electrical characteristics
parameters.
It is not recommended to connect an external load to the VCC2-PIN
LM251772
SNVSCT9 – OCTOBER 2024
www.ti.com
32
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Copyright © 2024 Texas Instruments Incorporated
Product Folder Links: LM251772



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