LMZ10503_15 Datasheet, PDF (1/35 Pages) Texas Instruments – LMZ10503 3-A SIMPLE SWITCHER® Power Module With 5.5-V Maximum Input Voltage

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LMZ10503
SNVS641J – JANUARY 2010 – REVISED SEPTEMBER 2015
LMZ10503 3-A SIMPLE SWITCHER^® Power Module With 5.5-V Maximum Input Voltage
1 Features
•1 Integrated Shielded Inductor
• Flexible Start-up Sequencing Using External Soft-
Start, Tracking, and Precision Enable
• Protection Against In-Rush Currents and Faults
Such as Input UVLO and Output Short-Circuit
• Single Exposed Pad and Standard Pinout for Easy
Mounting and Manufacturing
• Pin-to-Pin Compatible With
– LMZ10504 (4 A / 20 W Maximum)
– LMZ10505 (5 A / 25 W Maximum)
• Fully Enabled for WEBENCH^® and Power
Designer
• Electrical Specifications
– 15-W Maximum Total Output Power
– Up to 3-A Output Current
– Input Voltage Range 2.95 V to 5.5 V
– Output Voltage Range 0.8 V to 5 V
– ±1.63% Feedback Voltage Accuracy Over
Temperature
• Performance Benefits
– Operates at High Ambient Temperatures
– High Efficiency up to 96% Reduces System
Heat Generation
– Low Radiated Emissions (EMI) Tested to
EN55022 Class B Standard
– Fast Transient Response for Powering FPGAs
and ASICs
NOTE: EN 55022:2006, +A1:2007, FCC Part 15 Subpart B: 2007.
See Table 9 and layout for information on device under
test.
2 Applications
• Point-of-Load Conversions from 3.3-V and 5-V
Rails
• Space-Constrained Applications
• Noise Sensitive Applications (that is, Transceiver,
Medical)
3 Description
The LMZ10503 SIMPLE SWITCHER power module
is a complete, easy-to-use DC-DC solution capable of
driving up to a 3-A load with exceptional power
conversion efficiency, output voltage accuracy, line
and load regulation. The LMZ10503 is available in an
innovative package that enhances thermal
performance and allows for hand or machine
soldering.
The LMZ10503 can accept an input voltage rail
between 2.95 V and 5.5 V and can deliver an
adjustable and highly accurate output voltage as low
as 0.8 V. One megahertz fixed-frequency PWM
switching provides a predictable EMI characteristic.
Two external compensation components can be
adjusted to set the fastest response time, while
allowing the option to use ceramic and/or electrolytic
output capacitors. Externally programmable soft-start
capacitor facilitates controlled startup. The LMZ10503
is a reliable and robust solution with the following
features: lossless cycle-by-cycle peak current limit to
protect for over current or short-circuit fault, thermal
shutdown, input undervoltage lockout, and prebiased
start-up.
Device Information⁽¹⁾⁽²⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LMZ10503
TO-PMOD (7) 10.16 mm × 9.85 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
(2) Peak reflow temperature equals 245°C. See SNAA214 for
more details.
V_IN
Cin
Typical Application Circuit
VOUT ^{6, 7}
1
VIN
EN
2
LMZ10503
5
FB
SS
GND
3
CSS
4, EP
CO
Rfbt
Rfbb
Rcomp Ccomp
V_OUT
Efficiency V_OUT = 3.3 V
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.