Datasheet
LM2736
www.ti.com
SNVS316F –SEPTEMBER 2004–REVISED APRIL 2013
Operating Ratings
(1)
V
IN
3V to 18V
SW Voltage -0.5V to 18V
Boost Voltage -0.5V to 23V
Boost to SW Voltage 1.6V to 5.5V
Junction Temperature Range −40°C to +125°C
Thermal Resistance θ
JA
(2)
118°C/W
(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 ensured. For specific specifications and the test conditions,
see Electrical Characteristics.
(2) 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.
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
= 5V, 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 1.225 1.250 1.275 V
ΔV
FB
/ΔV
IN
Feedback Voltage Line Regulation V
IN
= 3V to 18V 0.01 % / V
I
FB
Feedback Input Bias Current Sink/Source 10 250 nA
Undervoltage Lockout V
IN
Rising 2.74 2.90
UVLO Undervoltage Lockout V
IN
Falling 2.0 2.3 V
UVLO Hysteresis 0.30 0.44 0.62
LM2736X 1.2 1.6 1.9
F
SW
Switching Frequency MHz
LM2736Y 0.40 0.55 0.66
LM2736X 85 92
D
MAX
Maximum Duty Cycle %
LM2736Y 90 96
LM2736X 2
D
MIN
Minimum Duty Cycle %
LM2736Y 1
R
DS(ON)
Switch ON Resistance V
BOOST
- V
SW
= 3V 350 650 mΩ
I
CL
Switch Current Limit V
BOOST
- V
SW
= 3V 1.0 1.5 2.3 A
I
Q
Quiescent Current Switching 1.5 2.5 mA
Quiescent Current (shutdown) V
EN
= 0V 30 nA
LM2736X (50% Duty Cycle) 2.2 3.3
I
BOOST
Boost Pin Current mA
LM2736Y (50% Duty Cycle) 0.9 1.6
Shutdown Threshold Voltage V
EN
Falling 0.4
V
EN_TH
V
Enable Threshold Voltage V
EN
Rising 1.8
I
EN
Enable Pin Current Sink/Source 10 nA
I
SW
Switch Leakage 40 nA
(1) Specified to Texas Instruments' Average Outgoing Quality Level (AOQL).
(2) Typicals represent the most likely parametric norm.
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