LP8728
FB_B1
SW_B1
V
OUT1
FB_B2
SW_B2
V
OUT2
FB_B3
SW_B3
V
OUT3
FB_B4
SW_B4
V
OUT4
1.5µH
1.5µH
AG
N
D
G
N
D
_B1
G
N
D
_B2
G
N
D
_
B3
G
N
D
_B4
EN_B1
EN_B2
EN_B3
EN_B4
PG_B1
PG_B2
PG_B3
PG_B4
Micro
Controller
DEFSEL
AVDD
BYP
V
IN
V
IN
VIN_B1
V
IN
VIN_B2
1.5µH
1.5µH
V
IN
V
IN
VIN_B3
VIN_B4
VDDIO
1µF
1µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
Chapter 2
SNVU231 – August 2013
Description of LP8728
The LP8728 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 run at fixed 3.3 MHz switching frequency. Buck converters switching is phase shifted to
minimize the input current spiking.
2.1
Features
•
Four High-Efficiency Step-Down DC/DC Converters
–
Max output current 1.0 A
–
Forced PWM operation
–
Soft-start control
–
V
OUT1
= 3.3 V
–
V
OUT2
- 1.25 V
–
V
OUT3
= 1.8 V or 2.65 V (pin selectable)
–
V
OUT4
= 1.8 V
•
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
2.2
Applications
•
Automotive Systems
Figure 2-1. Typical Application
3
SNVU231 – August 2013
Description of LP8728
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