Datasheet

LM2738
SNVS556B –APRIL 2008–REVISED APRIL 2013 www.ti.com
ELECTRICAL CHARACTERISTICS
Specifications with standard typeface are for T
J
= 25°C, and those in boldface type apply over the full Operating
Temperature Range (T
J
= -40°C to 125°C). V
IN
= 12V, V
BOOST
- V
SW
= 5V unless otherwise specified. Datasheet min/max
specification limits are ensured by design, test, or statistical analysis.
Symbol Parameter Conditions Min
(1)
Typ
(2)
Max
(1)
Units
V
FB
Feedback Voltage 0.784 0.800 0.816 V
ΔV
FB
/ΔV
IN
Feedback Voltage Line Regulation V
IN
= 3V to 20V 0.02 % / V
I
FB
Feedback Input Bias Current Sink/Source 0.1 100 nA
Undervoltage Lockout V
IN
Rising 2.7 2.90
UVLO Undervoltage Lockout V
IN
Falling 2.0 2.3 V
UVLO Hysteresis 0.4
LM2738X 1.28 1.6 1.92
F
SW
Switching Frequency MHz
LM2738Y 0.364 0.55 0.676
LM2738X , Load=150mA 92
D
MAX
Maximum Duty Cycle %
LM2738Y, Load=150mA 95
LM2738X 7.5
D
MIN
Minimum Duty Cycle %
LM2738Y 2
V
BOOST
- V
SW
= 3V,
R
DS(ON)
Switch ON Resistance 250 500 mΩ
Load=400mA
I
CL
Switch Current Limit V
BOOST
- V
SW
= 3V, V
IN
= 3V 2.0 2.9 A
Switching 1.9 3 mA
Quiescent Current
I
Q
Non-Switching 1.9 mA
Quiescent Current (shutdown) V
EN
= 0V 400 nA
LM2738X (27% Duty Cycle) 4.5
I
BOOST
Boost Pin Current mA
LM2738Y (27% Duty Cycle) 2.5
Shutdown Threshold Voltage V
EN
Falling - 0.4
V
EN_TH
V
Enable Threshold Voltage V
EN
Rising 1.4 -
I
EN
Enable Pin Current Sink/Source 10 nA
I
SW
Switch Leakage V
IN
= 20V 100 nA
(1) Ensured to Average Outgoing Quality Level (AOQL).
(2) Typicals represent the most likely parametric norm.
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