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LMZ14203EXT
www.ti.com
SNVS666F – JUNE 2010 – REVISED OCTOBER 2013
Electrical Characteristics
Limits in standard type are for T J = 25°C only; limits in boldface type apply over the junction temperature (T J ) range of -55°C
to +125°C. Minimum and Maximum limits are ensured through test, design or statistical correlation. Typical values represent
the most likely parametric norm at T J = 25°C, and are provided for reference purposes only. Unless otherwise stated the
following conditions apply: V IN = 24V, Vout = 3.3V
Symbol
Parameter
Conditions
Min
(1)
Typ
(2)
Max
(1)
Units
SYSTEM PARAMETERS
Enable Control
(3)
V EN
V EN-HYS
EN threshold trip point
EN threshold hysteresis
V EN rising
V EN falling
1.1
1.18
90
1.26
V
mV
Soft-Start
I SS
SS source current
V SS = 0V
4.9
8
11
μA
I SS-DIS
SS discharge current
-200
μA
Current Limit
I CL
Current limit threshold
d.c. average
3.15
4.2
5.3
A
V IN = 12V to 24V
ON/OFF Timer
t ON-MIN
t OFF
ON timer minimum pulse width
OFF timer pulse width
150
260
ns
ns
Regulation and Over-Voltage Comparator
V FB
In-regulation feedback voltage
V SS >+ 0.8V
0.784
0.804
0.825
V
T J = -55°C to 125°C
I O = 3A
V SS >+ 0.8V
0.786
0.802
0.818
V
T J = 25°C
I O = 10 mA
V FB-OV
Feedback over-voltage protection
0.92
V
threshold
I FB
Feedback input bias current
5
nA
I Q
I SD
Non Switching Input Current
Shut Down Quiescent Current
V FB = 0.86V
V EN = 0V
1
25
mA
μ A
Thermal Characteristics
T SD
T SD-HYST
θ JA
Thermal Shutdown
Thermal shutdown hysteresis
Junction to Ambient (4)
Rising
Falling
4 layer JEDEC Printed Circuit Board,
165
15
19.3
°C
°C
°C/W
100 vias, No air flow
2 layer JEDEC Printed Circuit Board, No
air flow
21.5
°C/W
θ JC
Junction to Case
No air flow
1.9
°C/W
PERFORMANCE PARAMETERS
Δ V O
Output Voltage Ripple
8
mV
PP
Δ V O / Δ V IN
Δ V O /I OUT
η
η
Line Regulation
Load Regulation
Efficiency
Efficiency
V IN = 12V to 42V, I O = 3A
V IN = 24V
V IN = 24V V O = 3.3V I O = 1A
V IN = 24V V O = 3.3V I O = 3A
.01
1.5
92
85
%
mV/A
%
%
(1)
(2)
(3)
(4)
Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation
using Statistical Quality Control (SQC) methods. Limits are used to calculate Average Outgoing Quality Level (AOQL).
Typical numbers are at 25°C and represent the most likely parametric normal.
EN 55022:2006, +A1:2007, FCC Part 15 Subpart B: 2007. See AN-2024 SNVA422 and layout for information on device under test.
θ JA measured on a 1.705” x 3.0” four layer board, with one ounce copper, thirty five thermal vias, no air flow, and 1W power dissipation.
Refer to PCB layout diagrams
Copyright ? 2010–2013, Texas Instruments Incorporated
Product Folder Links: LMZ14203EXT
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