Datasheet

LMZ22010
www.ti.com SNVS687G –MARCH 2011–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
Min Typ Max
Symbol Parameter Conditions Units
(1) (2) (1)
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 Sync input connected to ground 314 359 404 kHz
f
sync
Synchronization range V
sync
= 3.3Vp-p 314 600 kHz
V
IL-sync
Synchronization logic zero Relative to AGND 0.4 V
amplitude
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
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 SYNC = 3.0V 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
(3)
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
(4)
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 %
(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 Average Outgoing Quality Level (AOQL).
(2) Typical numbers are at 25°C and represent the most likely parametric norm.
(3) Theta JA measured on a 3.0” x 3.5 ” four layer board, with two ounce copper on outer layers and one ounce copper on inner layers, two
hundred and ten thermal vias, and 2W power dissipation. Refer to evaluation board application note layout diagrams.
(4) Refer to BOM in Typical Application Bill of Materials.
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