Datasheet

LMZ12010
www.ti.com SNVS667G –FEBRUARY 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 -40°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, V
OUT
= 3.3V
Symbol Parameter Conditions Min Typ Max Units
SYSTEM PARAMETERS
Enable Control
V
EN
EN threshold V
EN
rising 1.096 1.274 1.452 V
I
EN-HYS
EN hysteresis source current V
EN
> 1.274V 13 µA
Soft-Start
I
SS
SS source current V
SS
= 0V 40 50 60 µA
t
SS
Internal soft-start interval 1.6 msec
Current Limit
I
CL
Current limit threshold d.c. average 12.5 A
Internal Switching Oscillator
f
osc
Free-running oscillator frequency 314 359 404 kHz
Regulation and Over-Voltage Comparator
V
FB
In-regulation feedback voltage V
SS
>+ 0.8V 0.775 0.795 0.815 V
I
O
= 10A
V
FB-OV
Feedback over-voltage protection 0.86 V
threshold
I
FB
Feedback input bias current 5 nA
I
Q
Non Switching Quiescent Current 3 mA
I
SD
Shut Down Quiescent Current V
EN
= 0V 32 μA
D
max
Maximum Duty Factor 85 %
Thermal Characteristics
T
SD
Thermal Shutdown Rising 165 °C
T
SD-HYST
Thermal shutdown hysteresis Falling 15 °C
θ
JA
Junction to Ambient Natural Convection 9.9 °C/W
225 LFPM 6.8
500 LFPM 5.2
θ
JC
Junction to Case 1.0 °C/W
PERFORMANCE PARAMETERS
ΔV
O
Output voltage ripple BW@ 20 MHz 24 mV
PP
ΔV
O
/ΔV
IN
Line regulation V
IN
= 12V to 20V, I
OUT
= 10A ±0.2 %
ΔV
O
/ΔI
OUT
Load regulation V
IN
= 12V, I
OUT
= 0.001A to 10A 1 mV/A
η Peak efficiency V
IN
= 12V V
OUT
= 3.3V I
OUT
= 5A 89.5 %
η Full load efficiency V
IN
= 12V V
OUT
= 3.3V I
OUT
= 10A 87.5 %
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