LM2675-ADJ (Continued)
Symbol
Parameter
Conditions
Typ
(Note 4)
90
Min
Max
Units
(Note 5)
(Note 5)
η
Efficiency
VIN = 12V, ILOAD = 1A
%
All Output Voltage Versions
Specifications with standard type face are for TJ = 25˚C, and those with bold type face apply over full Operating Tempera-
ture Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable versions and VIN = 24V for the 12V ver-
sion, and ILOAD = 100 mA.
Symbol
Parameters
Conditions
Typ
2.5
2.5
Min
Max
Units
DEVICE PARAMETERS
IQ
Quiescent Current
VFEEDBACK = 8V
3.6
mA
For 3.3V, 5.0V, and ADJ Versions
VFEEDBACK = 15V
mA
For 12V Versions
ISTBY
Standby Quiescent
Current
ON/OFF Pin = 0V
50
1.55
1
100/150
2.1/2.2
25
µA
A
ICL
IL
Current Limit
1.25/1.2
Output Leakage Current
VIN = 40V, ON/OFF Pin = 0V
VSWITCH = 0V
µA
VSWITCH = −1V, ON/OFF Pin = 0V
ISWITCH = 1A
6
0.25
260
95
15
0.30/0.50
275
mA
Ω
RDS(ON)
Switch On-Resistance
Oscillator Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Feedback Bias
fO
D
Measured at Switch Pin
225
kHz
%
0
%
IBIAS
VS/D
VFEEDBACK = 1.3V
ADJ Version Only
85
nA
V
Current
ON/OFF Pin
1.4
0.8
7
2.0
37
Voltage Thesholds
ON/OFF Pin Current
Thermal Resistance
IS/D
ON/OFF Pin = 0V
20
95
µA
θJA
N Package, Junction to Ambient (Note 6)
M Package, Junction to Ambient (Note 6)
˚C/W
105
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 device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see
the Electrical Characteristics.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 3: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator
performance. When the LM2675 is used as shown in Figures 2, 3 test circuits, system performance will be as specified by the system parameters section of the
Electrical Characteristics.
Note 4: Typical numbers are at 25˚C and represent the most likely norm.
Note 5: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100%
production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used
to calculate Average Outgoing Quality Level (AOQL).
Note 6: 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
for the LLP (LD) package is specifically dependent on PCB trace area, trace material, and the number of layers and
J−A
thermal vias. For improved thermal resistance and power dissipation for the LLP package, refer to Application Note AN-1187.
www.national.com
4
NSC [ National Semiconductor ]
