Datasheet
TI Confidential - NDA Restrictions
LM2731
SNVS217F –MAY 2004–REVISED NOVEMBER 2012
www.ti.com
Electrical Characteristics
Limits in standard typeface are for T
J
= 25°C, and limits in boldface type apply over the full operating temperature range
(−40°C ≤ T
J
≤ +125°C). Unless otherwise specified: V
IN
= 5V, V
SHDN
= 5V, I
L
= 0A.
Parameter Test Conditions Min
(1)
Typ
(2)
Max
(1)
Units
V
IN
Input Voltage 2.7 14 V
V
OUT (MIN)
Minimum Output Voltage R
L
= 43Ω V
IN
= 2.7V 5.4 7 V
Under Load X Option
(3)
V
IN
= 3.3V 8 10
V
IN
= 5V 16
R
L
= 43Ω V
IN
= 2.7V 6 7.5
Y Option
(3)
V
IN
= 3.3V 8.75 11
V
IN
= 5V 15
R
L
= 15Ω V
IN
= 2.7V 3.75 5
X Option
(3)
V
IN
= 3.3V 5 6.5
V
IN
= 5V 10
R
L
= 15Ω V
IN
= 2.7V 4 5
Y Option
(3)
V
IN
= 3.3V 5.5 7
V
IN
= 5V 10
I
SW
Switch Current Limit See
(4)
1.8 2 A
1.4
R
DS
(ON) Switch ON Resistance I
SW
= 100 mA 260 400 mΩ
Vin = 5V 500
I
SW
= 100 mA 300 450
Vin = 3.3V 550
SHDN
TH
Shutdown Threshold Device ON 1.5
V
Device OFF 0.50
I
SHDN
Shutdown Pin Bias Current V
SHDN
= 0 0
µA
V
SHDN
= 5V 0 2
V
FB
Feedback Pin Reference V
IN
= 3V
1.205 1.230 1.255 V
Voltage
I
FB
Feedback Pin Bias Current V
FB
= 1.23V 60 500 nA
I
Q
Quiescent Current V
SHDN
= 5V, Switching "X" 2 3.0
mA
V
SHDN
= 5V, Switching "Y" 1.0 2
V
SHDN
= 5V, Not Switching 400 500
µA
V
SHDN
= 0 0.024 1
ΔV
FB
/ΔV
IN
FB Voltage Line 2.7V ≤ V
IN
≤ 14V
0.02 %/V
Regulation
F
SW
Switching Frequency
(5)
“X” Option 1 1.6 1.85
MHz
“Y” Option 0.40 0.60 0.8
D
MAX
Maximum Duty Cycle
(5)
“X” Option 78 86
%
“Y” Option 88 93
I
L
Switch Leakage Not Switching V
SW
= 5V 1 µA
(1) Limits are guaranteed by testing, statistical correlation, or design.
(2) Typical values are derived from the mean value of a large quantity of samples tested during characterization and represent the most
likely expected value of the parameter at room temperature.
(3) L = 10 µH, C
OUT
= 4.7 µF, duty cycle = maximum
(4) Switch current limit is dependent on duty cycle (see Typical Performance Characteristics).
(5) Guaranteed limits are the same for Vin = 3.3V input.
4 Submit Documentation Feedback Copyright © 2004–2012, Texas Instruments Incorporated
Product Folder Links: LM2731