Datasheet

LM2675
www.ti.com SNVS129E –MAY 2004–REVISED JUNE 2005
All Output Voltage Versions Electrical Characteristics (continued)
Specifications with standard type face are for T
J
= 25°C, and those with bold type face apply over full Operating
Temperature Range. Unless otherwise specified, V
IN
= 12V for the 3.3V, 5V, and Adjustable versions and V
IN
= 24V for the
12V version, and I
LOAD
= 100 mA.
Symbol Parameters Conditions Typ Min Max Units
I
L
Output Leakage Current V
IN
= 40V, ON/OFF Pin = 0V
1 25 μA
V
SWITCH
= 0V
V
SWITCH
= −1V, ON/OFF Pin = 0V 6 15 mA
R
DS(ON)
Switch On-Resistance I
SWITCH
= 1A 0.25 0.30/0.50 Ω
f
O
Oscillator Frequency Measured at Switch Pin 260 225 275 kHz
D Maximum Duty Cycle 95 %
Minimum Duty Cycle 0 %
I
BIAS
Feedback Bias V
FEEDBACK
= 1.3V
85 nA
Current ADJ Version Only
V
S/D
ON/OFF Pin
1.4 0.8 2.0 V
Voltage Thesholds
I
S/D
ON/OFF Pin Current ON/OFF Pin = 0V 20 7 37 μA
θ
JA
Thermal Resistance P Package, Junction to Ambient
(1)
95 °C/W
D Package, Junction to Ambient
(1)
105
(1) Junction to ambient thermal resistance with approximately 1 square inch of printed circuit board copper surrounding the leads. Additional
copper area will lower thermal resistance further. See Application Information section in the application note accompanying this
datasheet and the thermal model in LM267X Made Simple software (version 6.0). The value θ
J−A
for the WSON (NHN) package is
specifically dependent on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance
and power dissipation for the WSON package, refer to Application Note AN-1187 (SNOA401).
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