LM2675_14 Datasheet, PDF (6/30 Pages) Texas Instruments – SIMPLE SWITCHER® Power Converter High Efficiency 1A Step-Down Voltage Regulator

LM2675
SNVS129E – MAY 2004 – REVISED JUNE 2005
www.ti.com
All Output Voltage Versions Electrical Characteristics
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
DEVICE PARAMETERS
I_Q
Quiescent Current
V_FEEDBACK = 8V
2.5
For 3.3V, 5.0V, and ADJ Versions
3.6
mA
V_FEEDBACK = 15V
For 12V Versions
2.5
mA
I_STBY
I_CL
I_L
R_DS(ON)
f_O
D
Standby Quiescent Current
Current Limit
Output Leakage Current
Switch On-Resistance
Oscillator Frequency
Maximum Duty Cycle
ON/OFF Pin = 0V
V_IN = 40V, ON/OFF Pin = 0V
V_SWITCH = 0V
V_SWITCH = −1V, ON/OFF Pin = 0V
I_SWITCH = 1A
Measured at Switch Pin
50
100/150
μA
1.55 1.25/1.2
2.1/2.2
A
1
25
μA
6
15
mA
0.25
0.30/0.50
Ω
260
225
275
kHz
95
%
Minimum Duty Cycle
0
%
I_BIAS
Feedback Bias
Current
V_FEEDBACK = 1.3V
ADJ Version Only
85
nA
V_S/D
ON/OFF Pin
Voltage Thesholds
1.4
0.8
2.0
V
I_S/D
ON/OFF Pin Current
θ_JA
Thermal Resistance
ON/OFF Pin = 0V
N Package, Junction to Ambient ⁽¹⁾
M Package, Junction to Ambient ⁽¹⁾
20
7
95
105
37
μA
°C/W
(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 LLP (LD) 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 LLP package, refer to Application Note AN-1187.
6
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