LM2734
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
IN
SW Voltage
Boost Voltage
Boost to SW Voltage
FB Voltage
EN Voltage
Junction Temperature
ESD Susceptibility (Note 2)
Storage Temp. Range
-0.5V to 24V
-0.5V to 24V
-0.5V to 30V
-0.5V to 6.0V
-0.5V to 3.0V
-0.5V to (V
IN
+ 0.3V)
150˚C
2kV
-65˚C to 150˚C
Soldering Information
Infrared/Convection Reflow (15sec)
Wave Soldering Lead Temp. (10sec)
220˚C
260˚C
Operating Ratings
V
IN
SW Voltage
Boost Voltage
Boost to SW Voltage
Junction Temperature Range
Thermal Resistance
θ
JA
3V to 20V
-0.5V to 20V
-0.5V to 25V
1.6V to 5.5V
−40˚C to +125˚C
118˚C/W
Electrical Characteristics
Specifications with standard typeface are for T
J
= 25˚C, and those in
boldface type
apply over the full
Operating Tempera-
ture Range
(T
J
= -40˚C to 125˚C). V
IN
= 5V, V
BOOST
- V
SW
= 5V unless otherwise specified. Datasheet min/max specification
limits are guaranteed by design, test, or statistical analysis.
Symbol
V
FB
∆V
FB
/∆V
IN
I
FB
UVLO
Parameter
Feedback Voltage
Feedback Voltage Line
Regulation
Feedback Input Bias Current
Undervoltage Lockout
Undervoltage Lockout
UVLO Hysteresis
F
SW
D
MAX
D
MIN
R
DS(ON)
I
CL
I
Q
Switching Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Switch ON Resistance
Switch Current Limit
Quiescent Current
Quiescent Current (shutdown)
I
BOOST
V
EN_TH
I
EN
I
SW
Boost Pin Current
Shutdown Threshold Voltage
Enable Threshold Voltage
Enable Pin Current
Switch Leakage
LM2734X
LM2734Y
LM2734X
LM2734Y
LM2734X
LM2734Y
V
BOOST
- V
SW
= 3V
V
BOOST
- V
SW
= 3V
Switching
V
EN
= 0V
LM2734X (50% Duty Cycle)
LM2734Y (50% Duty Cycle)
V
EN
Falling
V
EN
Rising
Sink/Source
1.8
10
40
1.2
V
IN
= 3V to 20V
Sink/Source
V
IN
Rising
V
IN
Falling
2.0
0.30
1.2
0.40
85
90
Conditions
Min
0.784
Typ
0.800
0.01
10
2.74
2.3
0.44
1.6
0.55
92
96
2
1
300
1.7
1.5
30
2.5
1.0
3.5
1.8
0.4
600
2.5
2.5
0.62
1.9
0.66
MHz
%
%
mΩ
A
mA
nA
mA
V
nA
nA
250
2.90
V
Max
0.816
Units
V
%/V
nA
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see Electrical Characteristics.
Note 2:
Human body model, 1.5kΩ in series with 100pF.
Note 3:
Thermal shutdown will occur if the junction temperature exceeds 165˚C. The maximum power dissipation is a function of T
J(MAX)
,
θ
JA
and T
A
. The
maximum allowable power dissipation at any ambient temperature is P
D
= (T
J(MAX)
– T
A
)/θ
JA
. All numbers apply for packages soldered directly onto a 3” x 3” PC
board with 2oz. copper on 4 layers in still air. For a 2 layer board using 1 oz. copper in still air,
θ
JA
= 204˚C/W.
Note 4:
Guaranteed to National’s Average Outgoing Quality Level (AOQL).
Note 5:
Typicals represent the most likely parametric norm.
3
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