LMZ22008 Datasheet, PDF (5/26 Pages) Texas Instruments – 8A SIMPLE SWITCHER® Power Module with 20V Maximum Input Voltage and Current Sharing

Absolute Maximum Ratings (Note 3)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to PGND
EN, SYNC to AGND
SS, FB, SH to AGND
AGND to PGND
Junction Temperature
Storage Temperature Range
-0.3V to 24V
-0.3V to 5.5V
-0.3V to 2.5V
-0.3V to 0.3V
150°C
-65°C to 150°C
ESD Susceptibility (Note 4)
For soldering specifications:
see product folder at www.national.com and
www.national.com/ms/MS/MS-SOLDERING.pdf
± 2 kV
Operating Ratings (Note 3)
VIN
EN, SYNC
Operation Junction Temperature
6V to 20V
0V to 5.0V
−40°C to 125°C
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 guaranteed 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
(Note 5)
Typ
(Note 6)
Max
(Note 5)
Units
SYSTEM PARAMETERS
Enable Control
V_EN
I_EN-HYS
Soft-Start
EN threshold
EN hysteresis source current
V_EN rising
V_EN > 1.274V
1.096
1.274 1.452
V
13
µA
I_SS
t_SS
Current Limit
SS source current
Internal soft-start interval
V_SS = 0V
40
50
60
µA
1.6
msec
I_CL
Current limit threshold
Internal Switching Oscillator
d.c. average
10.5
A
f_osc
Free-running oscillator
frequency
Sync input connected to ground
314
359
404 kHz
f_sync
V_IL-sync
Synchronization range
Synchronization logic zero
amplitude
V_sync = 3.3Vp-p
Relative to AGND
314
600 kHz
0.4
V
V_IH-sync
Synchronization logic one
Relative to AGND
1.8
V
amplitude
Sync _d.c.
Synchronization duty cycle
range
15
50
85
%
Regulation and Over-Voltage Comparator
V_FB
V_FB-OV
In-regulation feedback voltage
Feedback over-voltage
protection threshold
V_SS >+ 0.8V
I_O = 8A
0.775
0.795 0.815
V
0.86
V
I_FB
Feedback input bias current
I_Q
Non Switching Quiescent
SYNC = 3.0V
Current
5
nA
3
mA
I_SD
Shut Down Quiescent Current
D_max
Maximum Duty Factor
Thermal Characteristics
V_EN = 0V
32
μA
85
%
T_SD
T_SD-HYST
θ_JA
Thermal Shutdown
Thermal shutdown hysteresis
Junction to Ambient (Note 7)
Rising
Falling
Natural Convection
225 LFPM
165
°C
15
°C
9.9
°C/W
6.8
500 LFPM
5.2
θ_JC
Junction to Case
1.0
°C/W
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