Datasheet

LMZ23603
www.ti.com SNVS711I –MARCH 2011–REVISED OCTOBER 2013
ELECTRICAL CHARACTERISTICS (continued)
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 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. Unless otherwise stated the
following conditions apply: V
IN
= 12V, Vout = 3.3V
Min Typ Max
Symbol Parameter Conditions Units
(1) (2) (1)
Internal Switching Oscillator
f
osc
Free-running oscillator frequency Sync input connected to ground. 711 812 914 kHz
f
sync
Synchronization range 650 950 kHz
V
IL-sync
Synchronization logic zero Relative to AGND 0.4 V
amplitude
V
IH-sync
Synchronization logic one Relative to AGND. 1.5 V
amplitude
V
sync d.c.
Synchronization duty cycle range 15 50 85 %
D
max
Maximum Duty Factor 83 %
Regulation and Over-Voltage Comparator
V
FB
In-regulation feedback voltage V
SS
>+ 0.8V 0.776 0.796 0.816 V
T
J
= -40°C to 125°C
I
O
= 3A
V
FB-OV
Feedback over-voltage protection 0.86 V
threshold
I
FB
Feedback input bias current 5 nA
I
Q
Non Switching Input Current V
FB
= 0.86V 2.6 mA
I
SD
Shut Down Quiescent Current V
EN
= 0V 70 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 Evaluation Printed Circuit Board, 12.0 °C/W
60 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 Cout = 220uF w/ 7 milliohm ESR + 9 mV
PP
100uF X7R + 2 x 0.047uF BW@ 20 MHz
ΔV
O
/ΔV
IN
Line regulation V
IN
= 12V to 36V, I
O
= 0.001A ±0.02 %
ΔV
O
/I
OUT
Load regulation V
IN
= 12V, I
O
= 0.001A to 3A 1 mV/A
η Peak efficiency V
IN
= 12V V
O
= 3.3V I
O
= 1A 86 %
η Full load efficiency V
IN
= 12V V
O
= 3.3V I
O
= 3A 85 %
η Peak efficiency V
IN
= 24V V
O
= 3.3V I
O
= 2A 80 %
η Full load efficiency V
IN
= 24V V
O
= 3.3V I
O
= 3A 78 %
(3) Theta JA measured on a 3.5” x 3.5” four layer board, with three ounce copper on outer layers and two ounce copper on inner layers,
sixty thermal vias, no air flow, and 1W power dissipation. Refer to PCB layout diagrams.
(4) Refer to BOM in Evaluation Board Bill of Materials.
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