LMZ31503_15 Datasheet, PDF (1/34 Pages) Texas Instruments – 3A SIMPLE SWITCHER® Power Module with 4.5V-14.5V Input in QFN Package

LMZ31503
www.ti.com
SNVS992 – JULY 2013
3A SIMPLE SWITCHER^® Power Module with 4.5V-14.5V Input in QFN Package
Check for Samples: LMZ31503
FEATURES
1
•2 Complete Integrated Power Solution Allows
Small Footprint, Low-Profile Design
• 9mm x 15mm x 2.8mm package
- Pin Compatible with LMZ31506
• Efficiencies Up To 95%
• Wide-Output Voltage Adjust
0.8 V to 5.5 V, with 1% Reference Accuracy
• Optional Split Power Rail Allows
Input Voltage Down to 1.6 V
• Adjustable Switching Frequency
(330 kHz to 780 kHz)
• Synchronizes to an External Clock
• Adjustable Slow-Start
• Output Voltage Sequencing / Tracking
• Power Good Output
• Programmable Undervoltage Lockout (UVLO)
• Overcurrent Protection (Hiccup-Mode)
• Over Temperature Protection
• Pre-bias Output Start-up
• Operating Temperature Range: –40°C to 85°C
• Enhanced Thermal Performance: 13°C/W
• Meets EN55022 Class B Emissions
- Integrated Shielded Inductor
APPLICATIONS
• Broadband & Communications Infrastructure
• Automated Test and Medical Equipment
• Compact PCI / PCI Express / PXI Express
• DSP and FPGA Point of Load Applications
• High Density Distributed Power Systems
100
95
90
85
80
75
70
65
60
55
50
45
40
0
VIN = PVIN = 5 V, VOUT = 3.3V, fSW = 630 kHz
VIN = PVIN = 12 V, VOUT = 3.3V, fSW = 630 kHz
0.5
1
1.5
2
2.5
3
Output Current (A)
G000
DESCRIPTION
The LMZ31503 SIMPLE SWITCHER® power module
is an easy-to-use integrated power solution that
combines a 3-A DC/DC converter with power
MOSFETs, a shielded inductor, and passives into a
low profile, QFN package. This total power solution
allows as few as 3 external components and
eliminates the loop compensation and magnetics
design process.
The 9×15×2.8 mm QFN package is easy to solder
onto a printed circuit board and allows a compact
point-of-load design with up to 95% efficiency and
excellent power dissipation with a thermal impedance
of 13°C/W junction to ambient. The device delivers
the full 3-A rated output current at 85°C ambient
temperature without airflow.
The LMZ31503 offers the flexibility and the feature-
set of a discrete point-of-load design and is ideal for
powering performance DSPs and FPGAs. Advanced
packaging technology afford a robust and reliable
power solution compatible with standard QFN
mounting and testing techniques.
SIMPLIFIED APPLICATION
V_IN
C_IN
LMZ31503
PVIN PWRGD
VIN
VOUT
SENSE+
V_OUT
C_OUT
RT/CLK
INH/UVLO
SS/TR VADJ
STSEL
PGND AGND
R_SET
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SIMPLE SWITCHER is a registered trademark of Texas Instruments.
2
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