LP8728-Q1 Datasheet, PDF (1/18 Pages) Texas Instruments – LP8728-Q1 Quad-Output Step-Down DC/DC Converter

LP8728-Q1
www.ti.com
SNVS972 – AUGUST 2013
LP8728-Q1 Quad-Output Step-Down DC/DC Converter
Check for Samples: LP8728-Q1
FEATURES
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• LP8728-Q1 is an Automotive Grade Product
that is AECQ-100 Grade 1 Qualified
• Four High Efficiency Step-Down DC/DC
Converters:
– 93% Peak Efficiency ( V_IN = 5.0V, V_OUT 3.3V)
– Max Output Current 1.0A
– Forced PWM Operation
– Soft-Start Control
– V_OUT1 = 3.3V
– V_OUT2 = 1.25V
– V_OUT3 = 1.8V or 2.65V (pin selectable)
– V_OUT4 = 1.8V
• Separate Enable Inputs for each Converter
Control
• Separate Power Good Outputs for each
Converter
• Output Over-Current and Input Over-Voltage
Protection
• Over-Temperature Protection
• Under-Voltage Lockout (UVLO)
• 28-pin 0.5 mm Pitch QFN Package
APPLICATIONS
• FPGA, DSP Core Power
• Processor Power for Mobile Devices
• Peripheral I/O Power
• Automotive Safety Cameras
• Automotive Infotainment
DESCRIPTION
The LP8728-Q1 is a quad-output Power Management
Unit, optimized for low-power FPGAs,
microprocessors, and DSPs. This device integrates
four highly efficient step-down DC/DC converters into
one package. All the converters operate above the
AM band with a fixed 3.2 MHz switching frequency.
Each buck converter's high-side switch turn-on time is
phase shifted to minimize input current spikes.
The protection features include output short-circuit
protection, switch current limits, input over-voltage
protection, input under-voltage lockout, and thermal
shutdown functions. During startup, the device
controls the output slew rate to minimize output
voltage overshoot and the input inrush current.
The device comes in a 5 x 5 x 0.8 mm 28-pin QFN
package with 0.5 mm pitch.
TYPICAL APPLICATION CIRCUIT
Micro
Controller
V_IN
1 μF
1 μF
VDDIO
AVDD
BYP
PG_B1
PG_B2
PG_B3
PG_B4
EN_B1
EN_B2
EN_B3
EN_B4
DEFSEL
LP8728
VIN_B1
SW_B1
FB_B1
1.5 μH
VIN_B2
SW_B2
FB_B2
1.5 μH
VIN_B3
FB_B3
SW_B3
1.5 μH
VIN_B4
FB_B4
SW_B4
1.5 μH
V_IN
10 μF
V_OUT1
10 μF
V_IN
10 μF
V_OUT2
10 μF
V_IN
10 μF
V_OUT3
10 μF
V_IN
10 μF
V_OUT4
10 μF
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated