LP8731-Q1_15 Datasheet, PDF (1/51 Pages) Texas Instruments – LP8731-Q1 Dual High-Current Step-Down DC-DC And Dual Linear Regulators with I2C Interface

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LP8731-Q1
SNVSA28 – DECEMBER 2014
LP8731-Q1 Dual High-Current Step-Down DC-DC And Dual Linear Regulators
with I²C Interface
1 Features
•1 Two LDOs for Powering Internal Processor
Functions and I/Os
• High-Speed Serial Interface for Independent
Control of Device Functions and Settings
• Precision Internal Reference
• Thermal Overload Protection
• Current Overload Protection
• Software Programmable Regulators
• External Power-On-Reset Function for Buck1 and
Buck2 (Power Good with Delay Function)
• Undervoltage Lockout (UVLO)
• LP8731-Q1 is an Automotive-Grade Product:
AECQ-100 Grade-1 Qualified
• Step-Down DC/DC Converter (2xBuck)
– Programmable V_OUT from:
– Buck1 : 0.8875 V – 1.675 V at 1.2 A
– Buck2 : 0.8875 V – 1.675 V at 1.2 A
– Up to 96% Efficiency
– PWM Switching Frequency of 2.1 MHz
– ±2% Output Voltage Accuracy
– Automatic Soft Start
• Linear Regulators (2xLDO)
– Programmable V_OUT of 0.8 V to 3.3 V
– ±3% Output Voltage Accuracy
– 300-mA Output Current
– 30-mV (Typical) Dropout
2 Applications
• Configurable Output PMU for ADAS (Advanced
Driver Assistance Systems)
• FPGA, DSP Core Power
• Applications Processors
3 Description
The LP8731-Q1 is a multi-function, programmable
Power Management Unit (PMU), optimized for low
power FPGAs, microprocessors, and DSPs. This
device integrates two highly efficient 1.2-A step-down
DC-DC converters with dynamic voltage management
(DVM), two 300-mA linear regulators, and a 400-kHz
I²C-compatible interface to allow a host controller
access to the internal control registers of the LP8731-
Q1. The LP8731-Q1 device additionally features
programmable power-on sequencing.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LP8731-Q1
DSBGA (25)
2.52 mm x 2.52 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
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Simplified Schematic
0.47 2F
1 2F
1 2F
0.47 2F
EN_T
ENLDO1
ENLDO2
ENSW1
ENSW2
LDO1
VINLDO1
VINLDO2
LDO2
VINLDO12
nPOR
VIN1
LP8731
SW1
FB1
GND_SW1
VIN2
SDA
SCL
GND_L
GND_C
SW2
FB2
GND_SW2
AVDD
VDD
1 2F
100k
10 2F
2.2 2H
LDO1
SDA
SCL
10 2F
10 2F
2.2 2H
10 2F
Buck1
LDO1
Buck2
LDO2
1 2F
I/O Voltage
Domain
Advanced
Power
Controller
Core ADAS
Domain
Block
Peripheral
ADAS
Blocks
Application
System or SoC
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.