Datasheet

LMZ10503EXT
www.ti.com SNVS668G –JUNE 2010–REVISED OCTOBER 2013
Electrical Characteristics
Specifications with standard typeface are for T
J
= 25°C only; limits in bold face type apply over the operating junction
temperature range T
J
of -55°C to 125°C. Minimum and maximum limits are specified 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. V
IN
= V
EN
= 3.3V, unless otherwise indicated in the conditions column.
Symbol Parameter Conditions Min
(1)
Typ
(2)
Max
(1)
Units
SYSTEM PARAMETERS
V
FB
Total Feedback Voltage Variation Including V
IN
= 2.95V to 5.5V 0.78 0.8 0.82 V
Line and Load Regulation V
OUT
= 2.5V
I
OUT
= 0A to 3A
V
FB
Feedback Voltage Variation V
IN
= 3.3V, V
OUT
= 2.5V 0.787 0.8 0.812 V
I
OUT
= 0A
V
FB
Feedback Voltage Variation V
IN
= 3.3V, V
OUT
= 2.5V 0.785 0.798 0.81 V
I
OUT
= 3A
V
IN(UVLO)
Input UVLO Threshold (Measured at VIN Rising 2.6 2.95 V
pin)
Falling 1.95 2.4
I
SS
Soft-Start Current Charging Current 2 µA
I
Q
Non-Switching Input Current V
FB
= 1V 1.7 3 mA
I
SD
Shut Down Quiescent Current V
IN
= 5.5V, V
EN
= 0V 260 500 µA
I
OCL
Output Current Limit (Average Current) V
OUT
= 2.5V 3.8 5.2 6.7 A
f
FB
Frequency Fold-back In current limit 250 kHz
PWM SECTION
f
SW
Switching Frequency 700 1000 1160 kHz
D
range
PWM Duty Cycle Range 0 100 %
ENABLE CONTROL
V
EN-IH
EN Pin Rising Threshold 1.23 1.8 V
V
EN-IF
EN Pin Falling Threshold 0.8 1.06 V
THERMAL CONTROL
T
SD
T
J
for Thermal Shutdown 145 °C
T
SD-HYS
Hysteresis for Thermal Shutdown 10 °C
THERMAL RESISTANCE
θ
JA
Junction to Ambient
(3)
20 °C/W
θ
JC
Junction to Case No air flow 1.9 °C/W
PERFORMANCE PARAMETERS
ΔV
OUT
Output Voltage Ripple Refer to Table 3 7 mV
pk-pk
V
OUT
= 2.5V
Bandwidth Limit = 2 MHz
ΔV
OUT
Output Voltage Ripple Refer to Table 5 Bandwidth 5 mV
pk-pk
Limit = 20 MHz
ΔV
FB
/ V
FB
Feedback Voltage Line Regulation ΔV
IN
= 2.95V to 5.5V
0.04 %
I
OUT
= 0A
ΔV
OUT
/ V
OUT
Output Voltage Line Regulation ΔV
IN
= 2.95V to 5.5V
0.04 %
I
OUT
= 0A, V
OUT
= 2.5V
ΔV
FB
/ V
FB
Feedback Voltage Load Regulation I
OUT
= 0A to 3A 0.25 %
ΔV
OUT
/ V
OUT
Output Voltage Load Regulation I
OUT
= 0A to 3A 0.25 %
V
OUT
= 2.5V
(1) Min and Max limits are 100% production tested at an ambient temperature (T
A
) of 25°C. Limits over the operating temperature range are
specified through correlation using Statistical Quality Control (SQC) methods. Limits are used to calculate TI’s Average Outgoing Quality
Level (AOQL).
(2) Typical numbers are at 25°C and represent the most likely parametric norm.
(3) θ
JA
measured on a 2.25” x 2.25” (5.8 cm x 5.8 cm) four layer board. Refer to PCB Layout Diagrams or Evaluation Board Application
Note: AN-2074 (SNVA450).
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