DC-DC Converter. LP8728B-Q1 Datasheet

LP8728B-Q1 Converter. Datasheet pdf. Equivalent

Part LP8728B-Q1
Description Quad-Output Step-Down DC-DC Converter
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LP8728B-Q1
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LP8728B-Q1
SNVSA70 – FEBRUARY 2015
LP8728B-Q1 Quad-Output Step-Down DC-DC Converter
1 Features
1 LP8728B-Q1 is an Automotive Grade Product that
is AECQ-100 Grade 1 Qualified
• Four High Efficiency Step-Down DC-DC
Converters:
– 93% Peak Efficiency (VIN = 5 V, VOUT = 3.3 V)
– Max Output Current 1 A
– Forced PWM Operation
– Soft-Start Control
– VOUT1 = 3.3 V
– VOUT2 = 1.2 V
– VOUT3 = 1.8 V or 2.65 V (pin selectable)
– VOUT4 = 1.5 V
• Separate Enable Inputs for each Converter
Control
• Separate Power Good Outputs for each Converter
• Output Overcurrent and Input Overvoltage
Protection
• Overtemperature Protection
• Undervoltage Lockout (UVLO)
2 Applications
• FPGA, DSP Core Power
• Processor Power for Mobile Devices
• Peripheral I/O Power
• Automotive Safety Cameras
• Automotive Infotainment
Micro
Controller
Simplified Schematic
VIN
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
SW_B3
FB_B3
1.5 µH
VIN_B4
SW_B4
FB_B4
1.5 µH
VIN
10 µF
VOUT1
10 µF
VIN
10 µF
VOUT2
10 µF
VIN
10 µF
VOUT3
10 µF
VIN
10 µF
VOUT4
10 µF
3 Description
The LP8728B-Q1 is a quad-output Power
Management Unit (PMU), optimized for low-power
FPGAs, microprocessors, and DSPs for automotive
applications. This device integrates four highly
efficient step-down DC-DC converters into one
package. Each converter has high current capability
and separate controls which allows flexibility to use
the device in multiple applications. All the converters
operate above the AM band with a fixed 3.2-MHz
switching frequency. The high-side switch turn-on
time of each converter is phase shifted to minimize
input current spikes.
Protection features include output short-circuit
protection, switch current limits, input overvoltage
protection, input undervoltage lockout, and thermal
shutdown functions. During start-up, the device
controls the output slew rate to minimize output
voltage overshoot and the input inrush current.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LP8728B-Q1
WQFN (28)
5.00 mm x 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
space
space
space
space
space
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Efficiency
100
90
80
70
60
50
40
30
3.3V
2.65V
20
1.8V
10
1.5V
1.2V
0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
IOUT (A)
D018
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.



LP8728B-Q1
LP8728B-Q1
SNVSA70 – FEBRUARY 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics........................................... 6
6.6 System Characteristics ............................................. 7
6.7 Typical Characteristics .............................................. 8
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 10
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 13
8 Application and Implementation ........................ 15
8.1 Application Information............................................ 15
8.2 Typical Application ................................................. 15
9 Power Supply Recommendations...................... 17
10 Layout................................................................... 18
10.1 Layout Guidelines ................................................. 18
10.2 Layout Example .................................................... 18
11 Device and Documentation Support ................. 19
11.1 Device Support .................................................... 19
11.2 Related Documentation......................................... 19
11.3 Trademarks ........................................................... 19
11.4 Electrostatic Discharge Caution ............................ 19
11.5 Glossary ................................................................ 19
12 Mechanical, Packaging, and Orderable
Information ........................................................... 19
4 Revision History
DATE
February 2015
REVISION
*
NOTES
Initial release.
2
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