Datasheet

Symbol Parameter Conditions Min Typ Max Unit
V
IH_EN
EN Pin Turn on Threshold V
EN
Rising 1.08 1.18 1.28 V
V
EN_HYS
EN Pin Hysteresis 66 mV
Thermal Shutdown
T
SD
Thermal Shutdown 160 °C
T
SD_HYS
Thermal Shutdown Hysteresis 10 °C
Thermal Resistance
θ
JA
Junction to Ambient 38 °C/W
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 do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The maximum allowable power dissipation is a function of the maximum junction temperature, T
J_MAX
, the junctions-to-ambient thermal resistance, θ
JA
,
and the ambient temperature, T
A
. The maximum allowable power dissipation at any ambient temperature is calculated using: P
D_MAX
= (T
J_MAX
– T
A
)/θ
JA
. The
maximum power dissipations of 2.6W is determined using T
A
= 25°C, θ
JA
= 38°C/W, and T
J_MAX
= 125°C.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor to each pin.
Typical Performance Characteristics Unless otherwise specified: C
IN
= C
OUT
= 100 µF, L = 1.0 µH
(Coilcraft MSS1038), V
IN
= 5V, V
OUT
= 1.2V, R
LOAD
= 1.2Ω, T
A
= 25°C for efficiency curves, loop gain plots and waveforms, and
T
J
= 25°C for all others.
Efficiency vs. Load Current (V
IN
= 5V)
30030831
Efficiency vs. Load Current (V
IN
= 3.3V)
30030830
High-Side FET Resistance vs. Temperature
30030852
Low-Side FET Resistance vs. Temperature
30030853
www.national.com 4
LM20154