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LM2670 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM2670
Description  SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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 4 page
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All Output Voltage Versions
Electrical Characteristics
Limits appearing in bold type face apply over the entire junction temperature range of operation, −40˚C to 125˚C. Specifica-
tions appearing in normal type apply for T
A =TJ = 25˚C. Unless otherwise specified VIN=12V for the 3.3V, 5V and Adjustable
versions and V
IN=24V for the 12V version, Sync pin open circuited..
Symbol
Parameter
Conditions
Typ
Min
Max
Units
DEVICE PARAMETERS
I
Q
Quiescent
Current
V
FEEDBACK = 8V
4.2
6
mA
For 3.3V, 5.0V, and ADJ Versions
V
FEEDBACK = 15V
For 12V Versions
I
STBY
Standby
Quiescent
Current
ON/OFF Pin = 0V
50
100/150
µA
I
CL
Current Limit
4.5
3.8/3.6
5.25/5.4
A
I
L
Output Leakage
Current
V
IN = 40V, ON/OFF Pin = 0V
V
SWITCH =0V
V
SWITCH = −1V
16
200
15
µA
mA
R
DS(ON)
Switch
On-Resistance
I
SWITCH =3A
0.15
0.17/0.29
f
O
Oscillator
Frequency
Measured at Switch Pin
260
225
280
kHz
D
Duty Cycle
Maximum Duty Cycle
91
%
Minimum Duty Cycle
0
%
I
BIAS
Feedback Bias
Current
V
FEEDBACK = 1.3V
ADJ Version Only
85
nA
V
ON/OFF
ON/OFF
Threshold
Voltage
1.4
0.8
2.0
V
I
ON/OFF
ON/OFF Input
Current
ON/OFF Input = 0V
20
45
µA
F
SYNC
Synchronization
Frequency
V
SYNC(Pin 5)=3.5V, 50% Duty Cycle
400
KHz
V
SYNC
SYNC Threshold
Voltage
1.4
V
θ
JA
Thermal
Resistance
T Package, Junction to Ambient
65
(Note 5)
θ
JA
T Package, Junction to Ambient
45
(Note 6)
θ
JC
T Package, Junction to Case
2
θ
JA
S Package, Junction to Ambient
56
˚C/W
(Note 7)
θ
JA
S Package, Junction to Ambient
35
(Note 8)
θ
JA
S Package, Junction to Ambient
26
(Note 9)
θ
JC
S Package, Junction to Case
2
++
θ
JA
SD Package, Junction to Ambient
55
˚C/W
(Note 10)
θ
JA
SD Package, Junction to Ambient
29
(Note 11)
www.national.com
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