Datasheet

LMZ12003EXT
www.ti.com SNVS663G –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
= 12V, Vout = 1.8V
Min Typ Max
Symbol Parameter Conditions Units
(1) (2) (1)
SYSTEM PARAMETERS
Enable Control
V
EN
EN threshold trip point V
EN
rising 1.1 1.18 1.26 V
V
EN-HYS
EN threshold hysteresis V
EN
falling 90 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 20V
ON/OFF Timer
t
ON-MIN
ON timer minimum pulse width 150 ns
t
OFF
OFF timer pulse width 260 ns
Regulation and Over-Voltage Comparator
V
FB
In-regulation feedback voltage V
SS
>+ 0.8V 0.773 0.793 0.813 V
T
J
= -55°C to 125°C
I
O
= 3A
V
SS
>+ 0.8V 0.784 0.800 0.816
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
Non Switching Input Current V
FB
= 0.86V 1 mA
I
SD
Shut Down Quiescent Current V
EN
= 0V 25 μA
Thermal Characteristics
T
SD
Thermal Shutdown Rising 165 °C
T
SD-HYST
Thermal shutdown hysteresis Falling 15 °C
θ
JA
Junction to Ambient
(3)
4 layer JEDEC Printed Circuit Board, 19.3 °C/W
100 vias, No air flow
2 layer JEDEC Printed Circuit Board, No 21.5 °C/W
air flow
θ
JC
Junction to Case No air flow 1.9 °C/W
PERFORMANCE PARAMETERS
(4)
ΔV
O
Output Voltage Ripple 8 mV
PP
ΔV
O
/ΔV
IN
Line Regulation V
IN
= 8V to 20V, I
O
= 3A .01 %
ΔV
O
/ΔV
IN
Load Regulation V
IN
= 12V 1.5 mV/A
η Efficiency V
IN
= 12V V
O
= 1.8V I
O
= 1A 87 %
η Efficiency V
IN
= 12V V
O
= 1.8V I
O
= 3A 77 %
(1) 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 Texas Instruments' Average Outgoing Quality Level
(AOQL).
(2) Typical numbers are at 25°C and represent the most likely parametric normal.
(3) 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.
(4) EN 55022:2006, +A1:2007, FCC Part 15 Subpart B: 2007. See AN-2024 SNVA422 and layout for information on device under test.
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