Datasheet

VIN
EN
GND
FB
VOUT
LMZ10503
V
IN
V
OUT
SS
C
in
C
O
R
fbt
R
comp
C
comp
R
fbb
C
SS
1
2
3
4, EP
5
6, 7
LMZ10503
SNVS641I –JANUARY 2010–REVISED OCTOBER 2013 www.ti.com
DESCRIPTION (CONTINUED)
The LMZ10503 can accept an input voltage rail between 2.95V and 5.5V and deliver an adjustable and highly
accurate output voltage as low as 0.8V. 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
under-voltage lock-out, and pre-biased startup.
System Performance
Current Derating (V
OUT
= 3.3V) Efficiency (V
OUT
= 3.3V)
Figure 2. Figure 3.
Radiated Emissions (EN 55022, Class B)
Figure 4.
Typical Application Circuit
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