lm2738xsdx National Semiconductor Corporation, lm2738xsdx Datasheet - Page 3

• Manufacturer Part Number: lm2738xsdx
• Description: Lm2738 550khz/1.6mhz 1.5a Step-down Dc-dc Switching Regulator
• Manufacturer: National Semiconductor Corporation

ΔV
Symbol
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Electrical Characteristics
Specifications with standard typeface are for T
Range (T
are guaranteed by design, test, or statistical analysis.
R
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: Typical thermal shutdown will occur if the junction temperature exceeds 165°C. The maximum power dissipation is a function of T
The maximum allowable power dissipation at any ambient temperature is P
3” PC board with 2 oz. copper on 4 layers in still air in accordance to JEDEC standards. Thermal resistance varies greatly with layout, copper thicknes, number
of layers in PCB, power distribution, number of thermal vias, board size, ambient temperature, and air flow.
Note 4: Guaranteed to National’s Average Outgoing Quality Level (AOQL).
Note 5: Typicals represent the most likely parametric norm.
V
UVLO
I
V
SW Voltage
Boost Voltage
Boost to SW Voltage
FB Voltage
EN Voltage
Junction Temperature
ESD Susceptibility (Note 2)
Storage Temp. Range
D
BOOST
D
FB
F
DS(ON)
EN_TH
V
I
IN
I
I
I
MAX
I
SW
FB
CL
EN
SW
MIN
FB
Q
/ΔV
, V
CC
IN
J
= -40°C to 125°C). V
Feedback Voltage
Feedback Voltage Line Regulation V
Feedback Input Bias Current
Undervoltage Lockout
Undervoltage Lockout
UVLO Hysteresis
Switching Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Switch ON Resistance
Switch Current Limit
Quiescent Current
Quiescent Current (shutdown)
Boost Pin Current
Shutdown Threshold Voltage
Enable Threshold Voltage
Enable Pin Current
Switch Leakage
Parameter
IN
= 12V, V
-0.5V to (V
BOOST
-65°C to 150°C
-0.5V to 6.0V
-0.5V to 3.0V
J
-0.5V to 24V
-0.5V to 24V
-0.5V to 30V
(Note 1)
Sink/Source
V
V
LM2738X
LM2738Y
LM2738X , Load=150mA
LM2738Y, Load=150mA
LM2738X
LM2738Y
V
Load=400mA
V
Switching
Non-Switching
V
LM2738X (27% Duty Cycle)
LM2738Y (27% Duty Cycle)
V
V
Sink/Source
V
= 25°C, and those in boldface type apply over the full Operating Temperature
- V
IN
IN
IN
BOOST
BOOST
EN
EN
EN
IN
IN
= 3V to 20V
Rising
Falling
= 20V
+ 0.3V)
SW
= 0V
Falling
Rising
150°C
= 5V unless otherwise specified. Datasheet min/max specification limits
2kV
- V
- V
Conditions
SW
SW
D
= 3V,
= 3V, V
= (T
3
J(MAX)
Operating Ratings
Soldering Information
V
SW Voltage
Boost Voltage
Boost to SW Voltage
Junction Temperature Range
Thermal Resistance θ
Thermal Shutdown (Note 3)
IN
– T
IN
Infrared/Convection Reflow (15sec)
Wave Soldering Lead Temp. (10sec)
= 3V
, V
A
)/θ
CC
JA
. All numbers apply for packages soldered directly onto a 3” x
(Note 4)
0.784
0.364
1.28
Min
2.0
2.0
1.4
JA
for LLP/eMSOP(Note 3)
(Note 5)
0.800
0.02
0.55
Typ
250
400
100
0.1
2.7
2.3
0.4
1.6
7.5
2.9
1.9
1.9
4.5
2.5
92
95
10
2
-
-
(Note 1)
−40°C to +125°C
(Note 4)
J(MAX)
0.816
0.676
Max
2.90
1.92
100
500
0.4
-0.5V to 25.5V
3
-0.5V to 20V
2.5V to 5.5V
, θ
www.national.com
3V to 20V
JA
60°C/W
and T
165°C
220°C
260°C
Units
% / V
MHz
mΩ
mA
mA
mA
nA
nA
nA
nA
A
%
%
V
V
A
V
.