Datasheet

LM27313
www.ti.com SNVS487D –DECEMBER 2006–REVISED APRIL 2013
Operating Ratings
V
IN
2.7V to 14V
V
SW(MAX)
30V
V
SHDN
0V to V
IN
Junction Temperature, T
J
(1)
-40°C to 125°C
θ
J-A
(SOT-23-5) 265°C/W
(1) The maximum power dissipation which can be safely dissipated for any application is a function of the maximum junction temperature,
T
J(MAX)
= 125°C, the junction-to-ambient thermal resistance for the SOT-23 package, θ
J-A
= 265°C/W, and the ambient temperature, T
A
.
The maximum allowable power dissipation at any ambient temperature for designs using this device can be calculated using the
formula:
If power dissipation exceeds the maximum specified above, the internal thermal protection circuitry will protect the device by reducing
the output voltage as required to maintain a safe junction temperature.
Electrical Characteristics
Unless otherwise specified: V
IN
= 5V, V
SHDN
= 5V, I
L
= 0 mA, and T
J
= 25°C. 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). Minimum and Maximum limits
are ensured through test, design, or statistical correlation. Typical values represent the most likely parametric norm at T
J
=
25°C, and are provided for reference purposes only.
Symbol Parameter Conditions Min Typical Max Units
V
IN
Input Voltage 2.7 14 V
I
SW
Switch Current Limit See
(1)
0.80 1.25 A
R
DS(ON)
Switch ON Resistance I
SW
= 100 mA 500 650 mΩ
Device ON 1.5
V
SHDN(TH)
Shutdown Threshold V
Device OFF 0.50
V
SHDN
= 0 0
I
SHDN
Shutdown Pin Bias Current µA
V
SHDN
= 5V 0 2
V
FB
Feedback Pin Reference Voltage V
IN
= 3V 1.205 1.230 1.255 V
I
FB
Feedback Pin Bias Current V
FB
= 1.23V 60 nA
V
SHDN
= 5V, Switching 2.1 3.0 mA
I
Q
Quiescent Current V
SHDN
= 5V, Not Switching 400 500
µA
V
SHDN
= 0 0.024 1
ΔV
FB
/ΔV
IN
FB Voltage Line Regulation 2.7V ≤ V
IN
≤ 14V 0.02 %/V
f
SW
Switching Frequency 1.15 1.6 1.90 MHz
D
MAX
Maximum Duty Cycle 80 88 %
I
L
Switch Leakage Not Switching, V
SW
= 5V 1 µA
(1) Switch current limit is dependent on duty cycle. Limits shown are for duty cycles ≤ 50%. See Figure 15 in Application Information –
MAXIMUM SWITCH CURRENT section.
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